CDC 3DX5X (Edit Code 02) Volume 2, Unit 2

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  • 1/39 Questions

    (207) What functions do the seven layers of the Open Systems Interconnection (OSI) reference model specify?

    • Programming
    • Transport
    • Network
    • Data
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About This Quiz

This quiz, titled 'CDC 3DX5X (Edit Code 02) Volume 2, Unit 2', assesses knowledge on the OSI Model, focusing on functions of its layers, sub-layers like LLC and MAC, and network topologies. It's essential for learners aiming to understand network structures and data communication protocols.

CDC 3DX5X (Edit Code 02) Volume 2, Unit 2 - Quiz

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  • 2. 

    (207) What layers make up the two categories of the seven layer of the Open Systems Interconnection (OSI) reference model.

    • Data Transport and Application

    • Session and Data Transport

    • Network and Presentation

    • Application and Session

    Correct Answer
    A. Data Transport and Application
    Explanation
    The correct answer is Data Transport and Application. The OSI reference model consists of seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. The Data Transport layer is responsible for reliable and efficient data transfer between network devices, while the Application layer provides services for user applications to access the network.

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  • 3. 

    (207) The logical link control (LLC) sub layer is a part of which Open Systems Interconnection (OSI) model layer?

    • Transport

    • Data Link

    • Physical

    • Session

    Correct Answer
    A. Data Link
    Explanation
    The logical link control (LLC) sub layer is a part of the Data Link layer in the OSI model. The Data Link layer is responsible for providing reliable and error-free transmission of data between adjacent network nodes. The LLC sub layer specifically handles flow control, error control, and framing of data packets. It ensures that data is properly encapsulated and delivered to the correct destination.

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  • 4. 

    (207) What does the logical link control (LLC) sub layer of the data link layer manage?

    • Communications between devices over multiple links of a network

    • Communications between devices over a single link of a network

    • Protocol access to the physical network medium

    • Protocol access to the links of a network

    Correct Answer
    A. Communications between devices over a single link of a network
    Explanation
    The logical link control (LLC) sub layer of the data link layer manages communications between devices over a single link of a network. This sub layer is responsible for error control, flow control, and framing of data packets. It ensures that data is properly transmitted and received between devices connected by a single link, providing a reliable and efficient communication channel.

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  • 5. 

    (207) What does the media access control (MAC) sub layer of the data link layer manage?

    • Communications between devices over a single link of a network

    • Communications between devices over multiple links of a network

    • Protocol access to the physical network medium

    • Protocol access to the links of a network

    Correct Answer
    A. Protocol access to the physical network medium
    Explanation
    The media access control (MAC) sub layer of the data link layer manages the protocol access to the physical network medium. This means that it governs how devices on a network access and use the physical medium, such as Ethernet cables or wireless frequencies, to send and receive data. The MAC sub layer ensures that devices take turns accessing the medium to avoid collisions and manage the flow of data.

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  • 6. 

    (208) When used alone, the word "topology" often refers to a networks

    • Transport topology

    • Physical topology

    • Physical medium

    • Logical topology

    Correct Answer
    A. Physical topology
    Explanation
    The word "topology" typically refers to the physical arrangement or structure of a network. This includes the layout of devices, cables, and connections in a network. It does not refer to the transport topology, which is related to how data is routed and delivered in a network. It also does not refer to the physical medium, which is the actual material used for data transmission. Finally, it does not refer to the logical topology, which describes how devices are logically connected in a network. Therefore, the correct answer is physical topology.

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  • 7. 

    (208) What network topology is another name for a bus topology?

    • Star

    • Ring

    • Loop

    • Linear

    Correct Answer
    A. Linear
    Explanation
    Linear is another name for a bus topology. In a bus topology, all devices are connected to a single cable called the bus. The devices share the same communication medium and can transmit data in both directions. The linear topology refers to the physical arrangement of devices in a straight line along the bus. This topology is commonly used in Ethernet networks and is known for its simplicity and ease of installation.

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  • 8. 

    (208) What topology offers centralized management of a network?

    • Bus

    • Star

    • Ring

    • Radial

    Correct Answer
    A. Star
    Explanation
    The star topology offers centralized management of a network. In a star topology, all devices are connected to a central hub or switch, which acts as a central point of control and management for the network. This allows for easier monitoring, troubleshooting, and administration of the network, as all communication flows through the central hub. Additionally, if one device fails in a star topology, it does not affect the rest of the network, making it a reliable and manageable option for network management.

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  • 9. 

    (208) What negative effect could occur when star networks are interconnected?

    • There are no negative effects

    • A fault in network cabling will disrupt all communication

    • Performance will suffer due to the load of the additional devices

    • When the central node point fails, large portions of the network become isolated

    Correct Answer
    A. When the central node point fails, large portions of the network become isolated
    Explanation
    When star networks are interconnected, the central node acts as a hub for all the connected devices. If the central node fails, it will result in large portions of the network becoming isolated. This means that communication between those isolated portions and the rest of the network will be disrupted. Therefore, the negative effect of interconnecting star networks is that a failure in the central node can cause significant network isolation and communication breakdown.

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  • 10. 

    (209) Which governing body is the authority for information technology (IT) communications within the Department of Defense (DOD) and every level of IT communication from the DOD information network to the war fighter under their scope of control?

    • Defense Information System Agency (DISA)

    • Federal Communications Commission (FCC)

    • Department of Homeland Security (DHS)

    • Department of Defense (DOD)

    Correct Answer
    A. Defense Information System Agency (DISA)
    Explanation
    The Defense Information System Agency (DISA) is the correct answer because it is the governing body responsible for information technology (IT) communications within the Department of Defense (DOD). DISA oversees every level of IT communication from the DOD information network to the war fighter under their scope of control. DISA ensures the secure and reliable operation of the DOD's IT infrastructure and provides IT services and capabilities to support the DOD's mission.

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  • 11. 

    (210) What is a Transmission Control Protocol (TCP) socket?

    • Regular of how much information passes over a TCP connection before the receiving host must send an acknowledgement

    • Reference location of a particular application or process on each machine (in the application layer)

    • Combination of a port number and Internet Protocol (IP) address used by a process to request network services and passes as an argument between layers

    • Preventer of network congestion by ensuring that transmitting devices do not overwhelm receiving devices data

    Correct Answer
    A. Combination of a port number and Internet Protocol (IP) address used by a process to request network services and passes as an argument between layers
    Explanation
    A TCP socket is a combination of a port number and an IP address that is used by a process to request network services and is passed as an argument between layers. This means that when a process wants to communicate over a network, it uses a TCP socket to specify which port and IP address it wants to communicate with. The TCP socket acts as a unique identifier for the process and allows it to establish a connection and exchange data with another process on a different machine.

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  • 12. 

    (210) What action is the purpose of a slide window in Transmission Control Protocol (TCP)?

    • Request network services and pass arguments between layers

    • Reference a location of a particular application or process on each machine

    • Prevent network congestion by ensuring that transmitting devices do not overwhelm receiving devices data

    • Regulate how much information passes over a TCP connection before the receiving host must send an acknowledgement

    Correct Answer
    A. Regulate how much information passes over a TCP connection before the receiving host must send an acknowledgement
    Explanation
    A slide window in Transmission Control Protocol (TCP) is used to regulate the amount of information that can pass over a TCP connection before the receiving host must send an acknowledgement. This helps in controlling the flow of data and prevents network congestion by ensuring that transmitting devices do not overwhelm receiving devices with data.

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  • 13. 

    (211) What portion of the Internet Protocol (IP) Data-gram (packet) allows IP to detect data-grams with corrupted headers and discard them?

    • Version Identification

    • Header Checksum

    • Time to Live

    • Flags

    Correct Answer
    A. Header Checksum
    Explanation
    The correct answer is "Header Checksum". The Header Checksum portion in the IP Datagram allows IP to detect data-grams with corrupted headers and discard them. The Header Checksum is a 16-bit field that contains a checksum value calculated over the IP header. When a data-gram is received, the receiver recalculates the checksum and compares it with the value in the Header Checksum field. If the values do not match, it indicates that the header has been corrupted during transmission, and the data-gram is discarded to maintain data integrity.

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  • 14. 

    (211) What value is the maximum of an octet in Internet Protocol version 4 (IPv4)?

    • 239

    • 254

    • 255

    • 256

    Correct Answer
    A. 255
    Explanation
    In Internet Protocol version 4 (IPv4), an octet is a group of 8 bits. Each bit can have a value of either 0 or 1, giving a total of 256 possible combinations (2^8). However, since the values range from 0 to 255, the maximum value for an octet in IPv4 is 255.

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  • 15. 

    (211) Which classes allow for a maximum of 254 hosts per network?

    • Class A address

    • Class B address

    • Class C address

    • Class D address

    Correct Answer
    A. Class C address
    Explanation
    Class C addresses allow for a maximum of 254 hosts per network. In IPv4, the address space is divided into different classes based on the number of network and host bits. Class C addresses have a default subnet mask of 255.255.255.0, which means that there are 24 network bits and 8 host bits. With 8 host bits, we can have 2^8 - 2 = 254 usable host addresses per network. Class A and Class B addresses have more network bits and fewer host bits, resulting in larger networks but fewer available host addresses. Class D addresses are used for multicast and do not have a specific number of hosts per network.

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  • 16. 

    (211) What class is reserved for multicast addressing?

    • Class A address

    • Class B address

    • Class C address

    • Class D address

    Correct Answer
    A. Class D address
    Explanation
    Class D address is reserved for multicast addressing. In IP addressing, multicast is a method of sending data packets to a group of devices simultaneously. Class D addresses range from 224.0.0.0 to 239.255.255.255 and are used for multicast group communication. These addresses are not assigned to specific devices but are used to identify a group of devices that are interested in receiving the multicast data.

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  • 17. 

    (212) What range of numbers are those of well known port numbers?

    • 0-1023

    • 1024-49151

    • 49152-65535

    • 65536-87000

    Correct Answer
    A. 0-1023
    Explanation
    Well known port numbers range from 0 to 1023. These are the port numbers that are commonly used by well-known protocols such as HTTP (port 80), FTP (port 21), and SSH (port 22). These port numbers are reserved for specific services and are often used by popular applications and protocols.

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  • 18. 

    (213) What characteristic is the major difference between Random Access Memory (RAM) and Read Only Memory (ROM)?

    • ROM is volatile, RAM is non-volatile

    • ROM is non-volatile, RAM is volatile

    • RAM has a slower access time versus ROM

    • ROM has a slower access time versus RAM

    Correct Answer
    A. ROM is non-volatile, RAM is volatile
    Explanation
    The major difference between Random Access Memory (RAM) and Read Only Memory (ROM) is that ROM is non-volatile, meaning that the data stored in ROM is retained even when the power is turned off. On the other hand, RAM is volatile, meaning that the data stored in RAM is lost when the power is turned off.

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  • 19. 

    (213) What action is the main purpose of system cache?

    • Speed up system Read Only Memory (ROM)

    • Reduce hard drive (HDD) access time to stored data

    • Reduce central processing unit (CPU) access time to stored data

    • Reduce Random Access Memory (RAM) access time to stored data

    Correct Answer
    A. Reduce central processing unit (CPU) access time to stored data
    Explanation
    The main purpose of system cache is to reduce central processing unit (CPU) access time to stored data. System cache stores frequently accessed data and instructions from the main memory, allowing the CPU to quickly retrieve this data without having to access the slower main memory. This helps to improve overall system performance by reducing the time it takes for the CPU to access the data it needs.

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  • 20. 

    (214) What speed is the maximum data transfer rate of USB 3.0 SuperSpeed (SS) transfer mode?

    • Two gigabits per second (GB/S)

    • Four GB/S

    • Five GB/S

    • 10 GB/S

    Correct Answer
    A. Five GB/S
    Explanation
    The correct answer is Five GB/S. USB 3.0 SuperSpeed transfer mode has a maximum data transfer rate of 5 gigabits per second (GB/S). This means that it can transfer data at a speed of 5 billion bits per second, which is significantly faster than the previous USB 2.0 standard. This high speed allows for faster file transfers and improved performance when using USB 3.0 devices.

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  • 21. 

    (215) What is a peripheral device?

    • A main internal component of a computer

    • Not a main internal component of a computer

    • A main component of a computer and can be either internal or external

    • Not a main component of a computer and can be either internal or external

    Correct Answer
    A. Not a main component of a computer and can be either internal or external
    Explanation
    A peripheral device is not a main component of a computer and can be either internal or external. This means that it is not essential for the basic functioning of a computer, but rather serves as an additional device that enhances the computer's capabilities. Peripheral devices can include items such as printers, scanners, keyboards, and mice, which can be connected to the computer either internally or externally to perform specific tasks.

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  • 22. 

    (215) What device optically reads an image, printed text, or an object and converts it to a digital image?

    • Printer

    • Scanner

    • Monitor

    • Camera Lens

    Correct Answer
    A. Scanner
    Explanation
    A scanner is a device that optically reads an image, printed text, or an object and converts it to a digital image. It uses a light source and a photosensitive element to capture the image and then converts it into a digital format that can be stored, manipulated, and displayed on a computer. Unlike a printer, which produces physical copies of digital images, a scanner takes physical copies and converts them into digital files. A monitor and camera lens are not devices specifically designed for converting physical images to digital format.

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  • 23. 

    (216) Which network is a group of computers and associated devices that share a common communications line and typically share the resources of a single processor or server within a small geographic area?

    • Local area network (LAN)

    • Wide area network (WAN)

    • Virtual private network (VPN)

    • Metropolitan area network (MAN)

    Correct Answer
    A. Local area network (LAN)
    Explanation
    A local area network (LAN) is a network of computers and devices that are connected together within a small geographic area, such as a home, office, or building. In a LAN, the computers and devices are connected to a common communications line, allowing them to share resources such as files, printers, and internet access. LANs are typically used in small-scale settings where the distance between devices is relatively short. Examples of LANs include home networks, office networks, and school networks.

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  • 24. 

    (216) Which network is a network that links local area networks (LAN) and Metropolitan area networks (MAN) by using long-distance communication links leased or purchased from a telecommunications company?

    • Local area network (LAN)

    • Wide area network (WAN)

    • Virtual private network (VPN)

    • Metropolitan area network (MAN)

    Correct Answer
    A. Wide area network (WAN)
    Explanation
    A wide area network (WAN) is a network that connects local area networks (LAN) and metropolitan area networks (MAN) by using long-distance communication links leased or purchased from a telecommunications company. Unlike LANs and MANs, which cover smaller geographical areas, WANs cover larger areas and allow for the transmission of data over longer distances. This makes WANs suitable for connecting remote locations and facilitating communication between different LANs and MANs. Therefore, the correct answer is wide area network (WAN).

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  • 25. 

    (216) Which network uses Carrier Sense Multiple Access/ Collision Avoidance (CSMA/CA) to avoid collisions while transmitting data?

    • Local area network (LAN)

    • Wide area network (WAN)

    • Metropolitan area network (MAN)

    • Wireless local area network (WLAN)

    Correct Answer
    A. Wireless local area network (WLAN)
    Explanation
    Wireless local area network (WLAN) uses Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) to avoid collisions while transmitting data. CSMA/CA is a protocol used in wireless networks where devices listen to the wireless medium before transmitting data. If the medium is busy, the device waits for a random amount of time before attempting to transmit again, thus reducing the chances of collisions. This method is necessary in wireless networks where multiple devices share the same wireless channel and collisions can occur if multiple devices transmit at the same time.

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  • 26. 

    (216) Which wireless local area network (WLAN) security method is best described as hiding a message in a service code?

    • Service set identifier (SSID) Broadcasting

    • Media access control (MAC) Filtering

    • Encryption

    • Tunneling

    Correct Answer
    A. Encryption
    Explanation
    Encryption is the best described method for hiding a message in a service code. Encryption involves the process of converting plaintext into ciphertext, making it unreadable to anyone without the proper decryption key. By encrypting the message, it becomes hidden within the service code and can only be accessed by authorized individuals with the correct decryption key. This method ensures the security and confidentiality of the message being transmitted over the wireless local area network (WLAN).

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  • 27. 

    (216) Which network provides a private tunnel through the Internet?

    • Local area network (LAN)

    • Wide area network (WAN)

    • Virtual private network (VPN)

    • Metropolitan area network (MAN)

    Correct Answer
    A. Virtual private network (VPN)
    Explanation
    A virtual private network (VPN) provides a private tunnel through the Internet. It allows users to securely connect to a remote network over the Internet by encrypting their data and routing it through a virtual tunnel. This ensures that the data remains private and protected from unauthorized access. VPNs are commonly used by individuals and organizations to access resources on a private network remotely while maintaining the security and privacy of their data.

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  • 28. 

    (217) What year did the Institue of Electrical and Electronics Engineers (IEEE) ratifies the use of gigabit Ethernet (GbE)?

    • 1988

    • 1999

    • 2005

    • 2009

    Correct Answer
    A. 1999
    Explanation
    In 1999, the Institute of Electrical and Electronics Engineers (IEEE) ratified the use of gigabit Ethernet (GbE). This means that in 1999, the IEEE officially approved and standardized the use of GbE, which allowed for faster data transmission speeds over Ethernet networks.

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  • 29. 

    (218) How many T1 Defense Switched Network (DSN) access circuits do Standardized Tactical Entry Point (STEP) terminals offer?

    • 24

    • 15

    • 10

    • 7

    Correct Answer
    A. 7
    Explanation
    Standardized Tactical Entry Point (STEP) terminals offer 7 T1 Defense Switched Network (DSN) access circuits.

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  • 30. 

    (219) Which device works as a transceiver that converts the electrical signal utilized in copper unshielded twisted pair (UTP) network cabling to light waves used for fiber optic cabling?

    • Media converter

    • Modem

    • Switch

    • Router

    Correct Answer
    A. Media converter
    Explanation
    A media converter is a device that converts the electrical signal used in copper unshielded twisted pair (UTP) network cabling to light waves used for fiber optic cabling. It allows for the seamless integration of different types of network media, such as copper and fiber, by converting the signals between them. This enables the transmission of data over longer distances and at higher speeds, making it an essential component in network infrastructure where copper and fiber optic cables are used together. A modem, switch, and router are all different types of networking devices that serve different purposes and do not perform the specific function of converting signals between copper and fiber optic cables.

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  • 31. 

    (220) Describe a network bridge

    • Data Link layer network device or software set that logically separates a single network into multiple segments or collision domains in Ethernet networks

    • Network layer device or software set that logically separates a single network into multiple segments or collision domains in Ethernet networks

    • Data Link layer device that provide central connection to network devices

    • Network layer device that provide central connection to network devices

    Correct Answer
    A. Data Link layer network device or software set that logically separates a single network into multiple segments or collision domains in Ethernet networks
    Explanation
    A network bridge is a Data Link layer network device or software set that logically separates a single network into multiple segments or collision domains in Ethernet networks. It allows for the division of a network into smaller parts, reducing network congestion and improving overall performance. By separating segments, a bridge prevents collisions and allows for better communication between devices within each segment. This helps to improve network efficiency and maintain data integrity.

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  • 32. 

    (221) What network routing protocols allow multiple autonomous systems to connect together?

    • Open shortest path first (OSPF)

    • Exterior gateway protocol (EGP)

    • Interior gateway protocol (IGP)

    • Enhanced Interior Gateway Routing Protocol (EIGRP)

    Correct Answer
    A. Exterior gateway protocol (EGP)
    Explanation
    Exterior Gateway Protocol (EGP) is a network routing protocol that allows multiple autonomous systems to connect together. It is specifically designed for interconnecting different autonomous systems and exchanging routing information between them. EGP enables the exchange of routing information and the determination of the best path for data to travel between different autonomous systems, ensuring efficient and reliable communication across interconnected networks.

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  • 33. 

    (222) What network device provides a remote network with connectivity to a host network?

    • Switch

    • Modem

    • Gateway

    • Converter

    Correct Answer
    A. Gateway
    Explanation
    A gateway is a network device that provides connectivity between different networks. It acts as an entry and exit point for data packets traveling between a remote network and a host network. It translates protocols, manages data flow, and ensures seamless communication between the two networks. Therefore, a gateway is the correct answer as it enables connectivity between a remote network and a host network.

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  • 34. 

    (223) What type of encryption provides the greatest degree of protection since the information fully encodes all the way through the network to the users' own end terminals?

    • Internet Protocol

    • End-to-end

    • Bulk

    • Link

    Correct Answer
    A. End-to-end
    Explanation
    End-to-end encryption provides the greatest degree of protection since it fully encodes the information from the network to the users' own end terminals. This means that the data is encrypted at the source and remains encrypted until it reaches the intended recipient, preventing any unauthorized access or interception along the way. This type of encryption ensures that only the sender and the recipient have access to the decrypted data, providing a high level of security and privacy.

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  • 35. 

    (224) What characteristic is not an advantage of fiber optic cable?

    • Cost to install and train technicians

    • Electromagnetic immunity

    • Low attenuation

    • Security

    Correct Answer
    A. Cost to install and train technicians
    Explanation
    The characteristic of "Cost to install and train technicians" is not an advantage of fiber optic cable. Fiber optic cable installation and technician training can be expensive compared to other types of cables. However, fiber optic cables have other advantages such as electromagnetic immunity, low attenuation, and security.

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  • 36. 

    (225) In general, how many operating system task categories are there?

    • Four

    • Five

    • Six

    • Seven

    Correct Answer
    A. Six
    Explanation
    There are generally six operating system task categories.

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  • 37. 

    (225) What UNIX system software interacts most closely with the hardware?

    • Shell

    • Kernel

    • User programs

    • Dynamic-link library

    Correct Answer
    A. Kernel
    Explanation
    The kernel is the UNIX system software that interacts most closely with the hardware. It is the core component of the operating system that manages the system's resources, such as memory, processes, and input/output devices. The kernel provides an interface between the hardware and the user programs, allowing them to access and utilize the system's resources efficiently. The shell, user programs, and dynamic-link library are all important components of the UNIX system, but they do not directly interact with the hardware like the kernel does.

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  • 38. 

    (226) What Microsoft application is a software program that allows users to create a desktop database?

    • Word

    • Access

    • Outlook

    • PowerPoint

    Correct Answer
    A. Access
    Explanation
    Access is a Microsoft application that allows users to create a desktop database. It provides a user-friendly interface for designing and managing databases, enabling users to store, organize, and manipulate data efficiently. With Access, users can create tables, forms, queries, and reports to meet their specific database needs. It is widely used for small to medium-sized projects and is particularly popular among businesses and organizations for managing and analyzing data effectively.

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  • 39. 

    (226) What Microsoft application is a personal information manager?

    • Word

    • Access

    • Outlook

    • PowerPoint

    Correct Answer
    A. Outlook
    Explanation
    Outlook is a personal information manager developed by Microsoft. It is commonly used as an email client, but it also includes features such as a calendar, task manager, contact manager, and note-taking. Outlook allows users to organize and manage their personal information in one place, making it an effective tool for managing emails, appointments, tasks, and contacts.

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Quiz Review Timeline (Updated): Mar 15, 2024 +

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  • Current Version
  • Mar 15, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 09, 2016
    Quiz Created by
    David

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