3DX5X - Volume 2 - UREs
Unit Review Exercise questions for 3DX5X - Volume 2.
Questions and Answers
- 1.
(201) What layer of the Open System Interconnect model defines the electrical, mechanical, procedural, and functional specifications for links between communicating network systems?
- A.
Physical
- B.
Data Link
- C.
Network
- D.
Transport
Correct Answer
A. PhysicalExplanation
The Physical layer of the Open System Interconnect (OSI) model is responsible for defining the electrical, mechanical, procedural, and functional specifications for links between communicating network systems. It deals with the physical aspects of communication, such as the transmission of bits over a physical medium, the types of cables and connectors used, and the voltage levels required for communication. This layer ensures that the data is transmitted reliably and accurately between devices.Rate this question:
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- 2.
(201) The Institute of Electrical and Electronics Engineers divide the Open System Interconnect Data Link Layers into what two sublayers?
- A.
High Level Data Link Control and Synchronous Data Link Control
- B.
Logical Link Control and Media Access Control
- C.
Distance Vector and Link State
- D.
RS-232 and RS-530
Correct Answer
B. Logical Link Control and Media Access ControlExplanation
The correct answer is Logical Link Control and Media Access Control. The Open System Interconnect (OSI) Data Link Layer is divided into these two sublayers. Logical Link Control (LLC) is responsible for error control and flow control, providing a reliable link between two devices. Media Access Control (MAC) is responsible for controlling access to the physical media, such as Ethernet or Wi-Fi, and handles addressing and data transmission. These two sublayers work together to ensure reliable and efficient communication between devices in a network.Rate this question:
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- 3.
(201) At what Open System Interconnect layer do network switches and bridges operate?
- A.
Network
- B.
Physical
- C.
Data Link
- D.
Transport
Correct Answer
C. Data LinkExplanation
Network switches and bridges operate at the Data Link layer of the Open System Interconnect (OSI) model. The Data Link layer is responsible for the reliable transmission of data between adjacent network nodes over a physical link. It handles the framing of data into frames, error detection and correction, and flow control. Network switches and bridges use MAC addresses to forward data packets within a local area network (LAN), making decisions based on the Data Link layer information.Rate this question:
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- 4.
(201) At what Open System Interconnect layer do routers operate?
- A.
Network
- B.
Physical
- C.
Data Link
- D.
Transport
Correct Answer
A. NetworkExplanation
Routers operate at the Network layer of the Open System Interconnect (OSI) model. The Network layer is responsible for routing packets across different networks, determining the best path for data transmission, and addressing and forwarding data packets. Routers use IP addresses to make decisions on how to direct traffic between different networks. They analyze the destination IP address in the packet header and make forwarding decisions based on routing tables. Therefore, routers play a crucial role in connecting different networks and enabling communication between them.Rate this question:
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- 5.
(201) At what Open System Interconnect layer are common data compression and encryption schemes used?
- A.
Application
- B.
Session
- C.
Presentation
- D.
Transport
Correct Answer
C. PresentationExplanation
Common data compression and encryption schemes are used at the Presentation layer of the Open System Interconnect (OSI) model. This layer is responsible for formatting and presenting data to the application layer. Data compression reduces the size of data for efficient transmission, while encryption ensures the security and confidentiality of data. Therefore, it is at the Presentation layer where these schemes are implemented.Rate this question:
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- 6.
(201) What Open System Interconnect layer is closest to the end user?
- A.
Application
- B.
Session
- C.
Presentation
- D.
Transport
Correct Answer
A. ApplicationExplanation
The Application layer is closest to the end user in the Open System Interconnect (OSI) model. This layer is responsible for providing services and interfaces for user applications to interact with the network. It includes protocols such as HTTP, FTP, and SMTP, which are used by applications to communicate over the network. Therefore, the Application layer directly interacts with the end user and is the closest layer to them in the OSI model.Rate this question:
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- 7.
(201) What is a formal set of rules and conventions that govern how computers exchange information over a network medium?
- A.
Specification
- B.
Standard
- C.
Etiquette
- D.
Protocol
Correct Answer
D. ProtocolExplanation
A protocol is a formal set of rules and conventions that govern how computers exchange information over a network medium. It defines the format, timing, sequencing, and error handling of data transmission between devices. Protocols ensure that different devices can communicate effectively and understand each other's messages. They provide a common language and structure for data exchange, enabling interoperability and reliable communication in computer networks.Rate this question:
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- 8.
(202) What topology defines the layout of a network's devices and media?
- A.
Physical
- B.
Logical
- C.
Star
- D.
Hybrid
Correct Answer
A. PhysicalExplanation
Physical topology refers to the physical arrangement of devices and media in a network. It defines how devices are connected to each other and how data flows through the network. This includes the layout of cables, connectors, and other physical components. Logical topology, on the other hand, refers to how data is transmitted in a network, regardless of the physical layout. The star topology is a specific type of physical topology where all devices are connected to a central hub or switch. A hybrid topology is a combination of different physical topologies.Rate this question:
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- 9.
(202) What topology defines the way in which devices communicate, and data is transmitted, throughout the network?
- A.
Physical
- B.
Logical
- C.
Star
- D.
Hybrid
Correct Answer
B. LogicalExplanation
Logical topology defines the way in which devices communicate and data is transmitted throughout the network. It describes the logical connections between devices, regardless of their physical locations. This includes the paths that data takes from one device to another and the rules and protocols that govern the communication process. It focuses on the logical arrangement of devices and how they are connected, rather than the physical layout of the network.Rate this question:
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- 10.
(202) What topology consists of devices connected to a common, shared cable?
- A.
Bus
- B.
Ring
- C.
Star
- D.
Hybrid
Correct Answer
A. BusExplanation
Bus topology consists of devices connected to a common, shared cable. In this type of network, all devices are connected to a single cable called the bus. The data is transmitted in both directions on the bus, and each device on the network receives the data. The advantage of bus topology is its simplicity and cost-effectiveness, as it requires less cabling compared to other topologies. However, if the bus cable fails, the entire network may be affected.Rate this question:
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- 11.
(202) What topology consists of cable segments from each computer connected to a centralized component?
- A.
Bus
- B.
Ring
- C.
Star
- D.
Hybrid
Correct Answer
C. StarExplanation
A star topology consists of cable segments from each computer connected to a centralized component, usually a switch or hub. In this configuration, all the devices are connected to a central point, which allows for easy management and troubleshooting. Each device has its own dedicated connection to the central component, providing better performance and reliability compared to other topologies.Rate this question:
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- 12.
(202) What topology combines two or more different physical topologies in a single network?
- A.
Bus
- B.
Ring
- C.
Star
- D.
Hybrid
Correct Answer
D. HybridExplanation
A hybrid topology combines two or more different physical topologies in a single network. This means that the network can have elements of different topologies, such as a combination of bus, ring, and star topologies. This allows for greater flexibility and scalability in the network, as different topologies can be used in different parts of the network to meet specific requirements.Rate this question:
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- 13.
(203) Which network protocol has the Department of Defense chosen as its standard to govern the flow of information?
- A.
AppleTalk
- B.
NetBios Extended User Interface
- C.
Transport Control Protocol/Internet Protocol
- D.
Internetwork Packet Exchange/Sequenced Packet Exchange
Correct Answer
C. Transport Control Protocol/Internet ProtocolExplanation
The Department of Defense has chosen the Transport Control Protocol/Internet Protocol (TCP/IP) as its standard network protocol to govern the flow of information. TCP/IP is a set of communication protocols that allows computers to connect and communicate over the internet. It provides reliable and secure transmission of data, ensuring that information can be efficiently and accurately transmitted across networks. This choice by the Department of Defense highlights the widespread adoption and effectiveness of TCP/IP as the standard protocol for network communication.Rate this question:
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- 14.
(203) What Transmission Control Protocol/Internet Protocol network layer protocol provides the service of matching a known IP address for a destination device to a Media Access Control address?
- A.
Internet Protocol
- B.
Address Resolution Protocol
- C.
Reverse Address Resolution Protocol
- D.
Internet Control Message Protocol
Correct Answer
B. Address Resolution ProtocolExplanation
The Address Resolution Protocol (ARP) is the correct answer because it is responsible for matching a known IP address for a destination device to a Media Access Control (MAC) address. ARP is used to find the MAC address of a device on the same network when only the IP address is known. It sends out an ARP request, and the device with the matching IP address responds with its MAC address, allowing communication to occur at the data link layer.Rate this question:
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- 15.
(203) What Transmission Control Protocol/Internet Protocol network layer protocol provides the IP address for a device that knows its own MAC address?
- A.
Internet Protocol
- B.
Address Resolution Protocol
- C.
Reverse Address Resolution Protocol
- D.
Internet Control Message Protocol
Correct Answer
C. Reverse Address Resolution ProtocolExplanation
The Reverse Address Resolution Protocol (RARP) is a network layer protocol that provides the IP address for a device that knows its own MAC address. RARP allows a device to send its MAC address to a RARP server and request its corresponding IP address. This is useful in situations where a device needs to obtain its IP address dynamically without manual configuration.Rate this question:
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- 16.
(203) What Transmission Control Protocol/Internet Protocol network layer protocol provides messaging that can help with troubleshooting?
- A.
Internet Protocol
- B.
Address Resolution Protocol
- C.
Reverse Address Resolution Protocol
- D.
Internet Control Message Protocol
Correct Answer
D. Internet Control Message ProtocolExplanation
The Internet Control Message Protocol (ICMP) is a network layer protocol that provides messaging capabilities to help with troubleshooting. ICMP is used to send error messages and operational information about network conditions. It allows devices to communicate information about network connectivity, congestion, and errors, which can be useful for network administrators to diagnose and resolve network issues.Rate this question:
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- 17.
(203) What Transmission Control Protocol/Internet Protocol transport layer protocol provides reliable data delivery services?
- A.
Internet Protocol
- B.
User Datagram Protocol
- C.
Transmission Control Protocol
- D.
Internet Control Message Protocol
Correct Answer
C. Transmission Control ProtocolExplanation
The Transmission Control Protocol (TCP) is a transport layer protocol that provides reliable data delivery services. TCP ensures that data sent over the network is received by the destination in the correct order and without any errors. It uses various mechanisms such as sequencing, acknowledgment, and retransmission to guarantee the reliable delivery of data. TCP is widely used in applications that require dependable and error-free data transmission, such as web browsing, email, and file transfer.Rate this question:
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- 18.
(203) What application within Transmission Control Protocol/Internet Protocol is used to send and receive files via TCP?
- A.
File Transfer Protocol
- B.
Trivial File Transfer Protocol
- C.
Simple Mail Transfer Protocol
- D.
HyperText Transfer Protocol
Correct Answer
A. File Transfer ProtocolExplanation
The correct answer is File Transfer Protocol (FTP). FTP is a standard network protocol used to transfer files from one host to another over a TCP-based network, such as the internet. It provides a simple and reliable way to send and receive files, allowing users to upload, download, and manage files on remote servers. FTP operates on the application layer of the TCP/IP protocol suite and uses a client-server architecture, where the client initiates the connection and the server responds to requests.Rate this question:
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- 19.
(204) What type of network connects networks that are typically separated by geographical distances between cities, states, countries, or around the world?
- A.
Local Area Network
- B.
Wide Area Network
- C.
Virtual Private Network
- D.
Metropolitan Area Network
Correct Answer
B. Wide Area NetworkExplanation
A Wide Area Network (WAN) is a type of network that connects networks that are typically separated by geographical distances between cities, states, countries, or around the world. Unlike Local Area Networks (LANs) that connect devices within a limited area, WANs provide connectivity over larger areas and are commonly used by organizations to connect their branches or offices located in different geographical locations. Virtual Private Networks (VPNs) provide secure access to a private network over a public network, while Metropolitan Area Networks (MANs) connect networks within a specific geographic area such as a city.Rate this question:
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- 20.
(204) What type of network makes use of tunneling and security protocols to enables a group of two or more computer systems to communicate over the public Internet?
- A.
Local Area Network
- B.
Wide Area Network
- C.
Virtual Private Network
- D.
Metropolitan Area Network
Correct Answer
C. Virtual Private NetworkExplanation
A Virtual Private Network (VPN) makes use of tunneling and security protocols to enable a group of two or more computer systems to communicate over the public Internet. It creates a secure and encrypted connection between the computers, allowing them to send and receive data as if they were on a private network. This ensures that the communication remains private and protected from potential eavesdropping or unauthorized access. VPNs are commonly used by organizations to provide secure remote access for their employees or to connect multiple branch offices together.Rate this question:
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- 21.
(204) Which is a common port that contains Hyper Text Transfer Protocol servers and proxies?
- A.
Port 80
- B.
Port 110
- C.
Port 443
- D.
Port 8080
Correct Answer
D. Port 8080Explanation
Port 8080 is a commonly used port that contains Hyper Text Transfer Protocol (HTTP) servers and proxies. While port 80 is the default port for HTTP, port 8080 is often used as an alternative port for HTTP servers and proxies. This allows for multiple web servers or applications to run on the same machine, each using a different port. It is also commonly used for testing and development purposes.Rate this question:
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- 22.
(205) How many bits are in an IPv4 address?
- A.
16 bits
- B.
32 bits
- C.
64 bits
- D.
128 bits
Correct Answer
B. 32 bitsExplanation
An IPv4 address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. It is a 32-bit address, which means it consists of 32 binary digits or bits. This allows for a total of 2^32 (approximately 4.3 billion) unique addresses, which are used to identify and locate devices on the internet.Rate this question:
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- 23.
(205) Instead of using binary, how are IPv4 addresses expressed to be more user-friendly?
- A.
Colon Hexadecimal Format
- B.
Dotted Decimal Notation
- C.
Hexadecimal
- D.
Octal
Correct Answer
B. Dotted Decimal NotationExplanation
IPv4 addresses are expressed in dotted decimal notation to make them more user-friendly. In this format, the 32-bit binary IP address is divided into four 8-bit sections, each represented by a decimal number ranging from 0 to 255. These sections are separated by dots, making it easier for users to read and understand the IP address. This format is widely used in networking and allows for easy identification and communication between devices on the internet.Rate this question:
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- 24.
(205) Using a range of 1-136 in the first octet of an IPv4 address, what class does it belong to?
- A.
Class A
- B.
Class B
- C.
Class C
- D.
Class D
Correct Answer
A. Class AExplanation
An IPv4 address is divided into different classes based on the range of values in the first octet. Class A addresses have a range of 1-126 in the first octet, so an address in the range of 1-136 would belong to Class A.Rate this question:
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- 25.
(205) What IPv4 class address is used for networks with about 250 nodes?
- A.
Class C
- B.
Class D
- C.
Class E
- D.
Class F
Correct Answer
A. Class CExplanation
Class C is the correct answer because it is specifically designed for networks with approximately 250 nodes. Class C addresses have a range of 192.0.0.0 to 223.255.255.255, and they provide a large number of network addresses, allowing for up to 254 hosts per network. This makes Class C suitable for small to medium-sized networks, such as home networks or small businesses, which typically have around 250 nodes. Class D, Class E, and Class F are not appropriate for this scenario as they have different purposes or reserved for special use.Rate this question:
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- 26.
(205) What iPv4 class address is used for multicast addressing?
- A.
Class C
- B.
Class D
- C.
Class E
- D.
Class F
Correct Answer
B. Class DExplanation
Class D is the correct answer because it is the class of IP addresses specifically reserved for multicast addressing. Multicast addressing allows a single packet to be sent to multiple recipients simultaneously, making it efficient for applications like streaming media or online gaming where a single source needs to reach multiple destinations. Class D addresses range from 224.0.0.0 to 239.255.255.255.Rate this question:
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- 27.
(205) What IPv4 reserved address is used for loop back?
- A.
0.0.0.0
- B.
127.0.0.1
- C.
207.55.157.255
- D.
255.255.255.255
Correct Answer
B. 127.0.0.1Explanation
The IPv4 reserved address used for loop back is 127.0.0.1. This address is commonly referred to as the loopback address and is used to test network connectivity on a local machine. When a packet is sent to this address, it is immediately looped back to the same machine without being transmitted over the network. This allows for testing and troubleshooting of network applications without the need for an actual network connection.Rate this question:
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- 28.
(205) What is a mechanism that allows a network device to divide an IP address into a network and host number?
- A.
Subnet mask
- B.
Broadcast
- C.
Multicast
- D.
Subnet
Correct Answer
A. Subnet maskExplanation
A subnet mask is a mechanism that allows a network device to divide an IP address into a network and host number. It is a 32-bit number that is used to determine which part of the IP address represents the network and which part represents the host. The subnet mask is applied to the IP address bitwise, where the network bits are set to 1 and the host bits are set to 0. By using a subnet mask, a network device can determine which devices are on the same network and can communicate with each other directly.Rate this question:
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- 29.
(205) What is the default classful subnet mask on class B networks?
- A.
255.255.0.0
- B.
255.255.240.0
- C.
255.255.255.0
- D.
255.255.255.224
Correct Answer
A. 255.255.0.0Explanation
The default classful subnet mask for class B networks is 255.255.0.0. This subnet mask allows for a maximum of 65,534 hosts per network. Class B networks have a range of IP addresses from 128.0.0.0 to 191.255.255.255. The first two octets of the subnet mask, 255.255, indicate that the network portion of the IP address is 16 bits long, while the remaining two octets, 0.0, indicate that the host portion is 16 bits long. This subnet mask provides a balance between the number of networks and the number of hosts per network.Rate this question:
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- 30.
(205) What method borrows bits from the host field of an IP address to create a subnet?
- A.
Classful Subnet Masking
- B.
Classless Inter-Domain Routing
- C.
Virtual Private Networking
- D.
Virtual Local Area Networking
Correct Answer
B. Classless Inter-Domain RoutingExplanation
Classless Inter-Domain Routing (CIDR) is a method that borrows bits from the host field of an IP address to create a subnet. CIDR allows for more flexibility in assigning IP addresses and creating subnets by using variable-length subnet masks. With CIDR, the length of the subnet mask can be adjusted to accommodate the specific needs of the network, allowing for more efficient use of IP addresses. This method is commonly used in modern networking to improve scalability and address space utilization.Rate this question:
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- 31.
(206) Instead of using binary, how are IPv6 addresses expressed to be more user-friendly?
- A.
Colon Hexadecimal Format
- B.
Dotted Decimal Notation
- C.
Hexadecimal
- D.
Octal
Correct Answer
A. Colon Hexadecimal FormatExplanation
IPv6 addresses are expressed in the colon hexadecimal format to make them more user-friendly. In this format, the address is divided into eight groups of four hexadecimal digits, separated by colons. This makes it easier for users to read and remember the address compared to binary or dotted decimal notation. Hexadecimal notation allows for a more compact representation of the address, as it uses a base-16 system instead of base-10. This format also aligns with the hexadecimal system used in computer programming, making it more familiar to users in the technology field.Rate this question:
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- 32.
(206) What notation is expressed in leading zero compression for IPv6?
- A.
1234:1234:0:0:1234:0:0:1234
- B.
10AB::3:0:1234:5678
- C.
255.255.255.255
- D.
127.0.0.1
Correct Answer
A. 1234:1234:0:0:1234:0:0:1234Explanation
The given answer, 1234:1234:0:0:1234:0:0:1234, is expressed in leading zero compression for IPv6. Leading zero compression allows consecutive blocks of zeros to be represented by double colons (::) instead of writing out all the zeros. In this case, the blocks of zeros between the numbers have been compressed using double colons, resulting in a shorter and more concise representation of the IPv6 address.Rate this question:
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- 33.
(206) What notation is expressed in zero compression for IPv6?
- A.
1234:1234:0:0:1234:0:0:1234
- B.
10AB::3:0:1234:5678
- C.
255.255.255.255
- D.
127.0.0.1
Correct Answer
B. 10AB::3:0:1234:5678Explanation
The given correct answer, "10AB::3:0:1234:5678," represents zero compression notation for IPv6. In IPv6, zero compression allows consecutive groups of zeros to be represented by a double colon "::". This notation helps to shorten the IPv6 address and make it more readable. In the given answer, "::" is used to represent consecutive groups of zeros, resulting in a shorter representation of the address.Rate this question:
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- 34.
(206) What Unicast address scope operates within a network segment, and will not originate from, or to be destined to, an interface that requires a router to direct traffic?
- A.
Site-local
- B.
Link-local
- C.
Aggregatable Local
- D.
Aggregatable Global
Correct Answer
B. Link-localExplanation
Link-local addresses operate within a network segment and do not require a router to direct traffic. These addresses are automatically assigned to interfaces on the network and are used for communication within the local network only. They cannot be routed outside of the network segment and are not globally unique. Therefore, link-local is the correct answer for the given question.Rate this question:
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- 35.
(206) What Unicast address scope is designed to be private, internally routable addresses that do not route outside the site?
- A.
Site-local
- B.
Link-local
- C.
Aggregatable Local
- D.
Aggregatable Global
Correct Answer
A. Site-localExplanation
Site-local addresses are designed to be private, internally routable addresses that do not route outside the site. These addresses are used within a specific site or organization and are not meant to be globally unique. They provide a way for devices within the same site to communicate with each other without the need for global routing. Site-local addresses were deprecated in favor of Unique Local Addresses (ULA) in IPv6.Rate this question:
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- 36.
(206) What Unicast address scope is publicly accessible with the Network ID portion of the address broken up into different areas allowing for hierarchical design and allocation?
- A.
Site-local
- B.
Link-local
- C.
Aggregatable Local
- D.
Aggregatable Global
Correct Answer
D. Aggregatable GlobalExplanation
Aggregatable Global is the correct answer because it refers to a unicast address scope that allows for hierarchical design and allocation. In this scope, the Network ID portion of the address is broken up into different areas, which enables efficient routing and management of IP addresses. This type of address is publicly accessible, meaning it can be used on the internet and is not limited to a specific site or link.Rate this question:
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- 37.
(207) The computing part of the computer is the central processing unit, also called the
- A.
Control unit.
- B.
Minicomputer.
- C.
Microprocessor.
- D.
Arithmetic logic unit.
Correct Answer
C. Microprocessor.Explanation
The computing part of a computer refers to the component responsible for executing instructions and performing calculations. The central processing unit (CPU) is the primary computing component, which consists of several subunits including the control unit, arithmetic logic unit (ALU), and the microprocessor. Among these options, the microprocessor is the correct answer as it is a small chip that contains the ALU, control unit, and other necessary components for processing data and executing instructions.Rate this question:
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- 38.
(207) What two main components make up the central processing unit?
- A.
Control unit and read-only memory.
- B.
Control unit and arithmetic logic unit.
- C.
Arithmetic logic unit and read-only memory.
- D.
Arithmetic logic unit and random access memory.
Correct Answer
B. Control unit and arithmetic logic unit.Explanation
The central processing unit (CPU) is made up of two main components: the control unit and the arithmetic logic unit. The control unit is responsible for coordinating and controlling the operations of the CPU, while the arithmetic logic unit performs mathematical and logical operations. These two components work together to execute instructions and perform calculations in a computer system.Rate this question:
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- 39.
(207) What is the type of memory that retains data after power is removed or lost?
- A.
Volatile
- B.
Nonvolatile
- C.
Secured
- D.
Unsecured
Correct Answer
B. NonvolatileExplanation
Nonvolatile memory refers to a type of memory that retains data even after the power is removed or lost. Unlike volatile memory, which loses its stored information when power is cut off, nonvolatile memory ensures that the data remains intact. This type of memory is commonly used in devices such as hard drives, solid-state drives, flash memory, and ROM (Read-Only Memory) chips, where it is crucial to preserve data even in the absence of power.Rate this question:
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- 40.
(207) Which landline transmission medium is the primary carrier of voice communications?
- A.
Twisted pair cable
- B.
Fiber optic cable
- C.
Coaxial cable
- D.
Twinax cable
Correct Answer
A. Twisted pair cableExplanation
Twisted pair cable is the primary carrier of voice communications because it is a reliable and cost-effective transmission medium. It consists of two insulated copper wires twisted together, which helps to reduce electromagnetic interference and crosstalk. This makes it ideal for carrying voice signals over long distances without significant degradation in quality. Additionally, twisted pair cable is widely available and easy to install, making it the preferred choice for telephone systems and other voice communication applications.Rate this question:
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- 41.
(207) An optical communications system is comprised of a
- A.
Transmitter, cable, and receiver.
- B.
Transmitter, cable, and logic analyzer.
- C.
Transmitter, transmission medium, and logic analyzer.
- D.
Transmitter, transmission medium, and protocol analyzer.
Correct Answer
A. Transmitter, cable, and receiver.Explanation
The correct answer is transmitter, cable, and receiver. In an optical communications system, the transmitter is responsible for converting electrical signals into optical signals, which are then transmitted through a cable made of optical fibers. The receiver at the other end of the cable receives the optical signals and converts them back into electrical signals. The cable acts as the transmission medium, allowing the optical signals to travel from the transmitter to the receiver. A logic analyzer or protocol analyzer is not typically part of an optical communications system.Rate this question:
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- 42.
(207) Which of the following is not one of the three advantages to using wireless technology?
- A.
Ease of installation
- B.
Lower cost
- C.
Safety
- D.
Mobility
Correct Answer
C. SafetyExplanation
Wireless technology offers several advantages, including ease of installation, lower cost, and mobility. However, safety is not one of the advantages. While wireless technology provides convenience and flexibility, it also poses potential risks such as security vulnerabilities, interference, and health concerns related to electromagnetic radiation. Therefore, safety cannot be considered as an advantage of using wireless technology.Rate this question:
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- 43.
(207) The ability to move about without being tethered by wires technology is called
- A.
Mobility.
- B.
Ease of installations.
- C.
War driving.
- D.
Motion capture technology.
Correct Answer
A. Mobility.Explanation
The correct answer is mobility. Mobility refers to the ability to move about freely without being restricted by wires or cables. It is a technology that allows users to access and use devices or systems wirelessly, providing flexibility and convenience. This term is commonly used in various fields such as telecommunications, computing, and electronics to describe wireless connectivity and the freedom of movement it enables.Rate this question:
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- 44.
(207) Which of the following is not one of the four security threats to Wireless Local Area Network?
- A.
Rogue Access Points
- B.
Direct Connections
- C.
War Drivers
- D.
Hackers
Correct Answer
B. Direct ConnectionsExplanation
Direct Connections is not one of the four security threats to Wireless Local Area Network. Rogue Access Points, War Drivers, and Hackers are all potential security threats to a WLAN. Rogue Access Points refer to unauthorized access points that are connected to a network without proper authorization. War Drivers are individuals who drive around searching for wireless networks to exploit. Hackers are individuals who attempt to gain unauthorized access to a network or system. Direct Connections, on the other hand, typically refer to wired connections and do not pose a direct security threat to a WLAN.Rate this question:
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- 45.
(207) Who is an authorized client that may unknowingly or maliciously help outside parties gain access to a network?
- A.
Auditor
- B.
Employee
- C.
War Driver
- D.
Hacker
Correct Answer
B. EmployeeExplanation
An employee is an authorized client who may unknowingly or maliciously help outside parties gain access to a network. As an authorized user, an employee has legitimate access to the network and its resources. However, due to lack of awareness, negligence, or malicious intent, an employee can inadvertently or intentionally assist external parties in gaining unauthorized access to the network. This can be done through actions such as sharing passwords, falling victim to phishing attacks, or intentionally providing sensitive information to unauthorized individuals.Rate this question:
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- 46.
(207) What organization developed several wireless standards to meet the demands of security, speed, and flexibility of today's wireless networks?
- A.
Institute of Electrical Electronics Engineers
- B.
International Organization for Standardization
- C.
Internet assigned numbers authority
- D.
National Science Foundation network
Correct Answer
A. Institute of Electrical Electronics EngineersExplanation
The Institute of Electrical Electronics Engineers (IEEE) developed several wireless standards to meet the demands of security, speed, and flexibility of today's wireless networks. These standards include IEEE 802.11, also known as Wi-Fi, which is widely used for wireless communication. The IEEE is a professional association that focuses on advancing technology and innovation in various fields, including wireless networking. Their standards ensure interoperability and compatibility among different wireless devices, allowing for seamless communication and efficient network performance.Rate this question:
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- 47.
(208) How many peripherals can a Universal Serial Bus handle at once?
- A.
127
- B.
128
- C.
227
- D.
228
Correct Answer
A. 127Explanation
A Universal Serial Bus (USB) can handle up to 127 peripherals at once. This is because USB uses a 7-bit address scheme, allowing for a maximum of 127 unique addresses. Each peripheral connected to the USB is assigned a unique address, and the USB controller can communicate with each peripheral individually using these addresses. Therefore, the correct answer is 127.Rate this question:
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- 48.
(208) How many devices can connect to a FireWire bus?
- A.
63
- B.
64
- C.
65
- D.
66
Correct Answer
A. 63Explanation
A FireWire bus can support up to 63 devices. FireWire is a high-speed serial bus interface that allows multiple devices to be connected and communicate with each other. The maximum number of devices that can be connected to a FireWire bus is limited to 63 due to addressing limitations. Each device connected to the bus requires a unique address, and the addressing scheme for FireWire allows for a maximum of 63 unique addresses. Therefore, the correct answer is 63.Rate this question:
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- 49.
(209) What do you apply across Liquid Crystal Display material to change the alignment and light polarizing property?
- A.
Current
- B.
Voltage
- C.
Resistance
- D.
Inductance
Correct Answer
B. VoltageExplanation
Voltage is applied across Liquid Crystal Display (LCD) material to change the alignment and light polarizing property. By applying a voltage, the liquid crystals in the display can be reoriented, which alters the alignment of the molecules and changes the polarization of light passing through the material. This allows for the control of light transmission and enables the display to produce different colors and shades.Rate this question:
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- 50.
(210) What is a Data Link layer network device that logically separates a single network into two segments or collision domains in Ethernet networks?
- A.
Hub
- B.
Bridge
- C.
Switch
- D.
Router
Correct Answer
B. BridgeExplanation
A bridge is a Data Link layer network device that logically separates a single network into two segments or collision domains in Ethernet networks. It receives data frames from one segment and forwards them only to the segment where the intended recipient is located, effectively reducing collisions and improving network performance. Unlike a hub, which simply broadcasts data to all connected devices, a bridge intelligently filters and forwards data based on the destination MAC address, making it a more efficient and secure option for segmenting networks.Rate this question:
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Mar 22, 2023Quiz Edited by
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Dec 19, 2012Quiz Created by
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