CompTIA Network + Practice Quiz Short
Questions and Answers
- 1.
FTP port number?
- A.
21
- B.
53
- C.
67
- D.
167
Correct Answer
A. 21Explanation
The correct answer is 21. FTP (File Transfer Protocol) uses port number 21 for communication between a client and a server. This port is designated specifically for FTP and is commonly used for uploading and downloading files over a network.Rate this question:
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- 2.
DHCP port number?
- A.
21
- B.
53
- C.
67
- D.
167
Correct Answer
C. 67Explanation
The DHCP (Dynamic Host Configuration Protocol) port number is 67. DHCP is a network protocol used to automatically assign IP addresses and other network configuration parameters to devices on a network. Port numbers are used to identify specific processes or services running on a device. In the case of DHCP, port number 67 is used by DHCP servers to receive client requests and assign IP addresses.Rate this question:
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- 3.
DNS port number?
- A.
21
- B.
53
- C.
67
- D.
167
Correct Answer
B. 53Explanation
The correct answer is 53. DNS (Domain Name System) uses port number 53 for communication. DNS is responsible for translating domain names into IP addresses, allowing users to access websites by typing in the domain name instead of the IP address. Port number 53 is specifically assigned for DNS queries and responses, ensuring that the information is properly routed between DNS servers and clients.Rate this question:
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- 4.
Telnet port number?
- A.
21
- B.
23
- C.
67
- D.
167
Correct Answer
B. 23Explanation
The correct answer is 23. The Telnet protocol uses port number 23 for communication. Telnet is a network protocol that allows a user to remotely access and manage a device or computer over a network. It provides a virtual terminal connection to the remote device, allowing the user to execute commands and perform administrative tasks. Port number 23 is specifically reserved for Telnet communication, making it the correct answer.Rate this question:
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- 5.
POP3 Port number?
- A.
25
- B.
110
- C.
143
- D.
167
Correct Answer
B. 110Explanation
The correct answer is 110. POP3 stands for Post Office Protocol version 3 and it is used for receiving emails from a mail server. The POP3 port number is 110, which is the port that the email client connects to in order to retrieve incoming emails.Rate this question:
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- 6.
SMTP Port number?
- A.
25
- B.
110
- C.
143
- D.
167
Correct Answer
A. 25Explanation
SMTP stands for Simple Mail Transfer Protocol. It is a protocol used for sending email messages between servers. The default port number for SMTP is 25. This means that when an email is sent from one server to another, it is typically transmitted over port 25. By using this port number, the sending server can establish a connection with the receiving server and transfer the email message.Rate this question:
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- 7.
IMAP Port number?
- A.
25
- B.
110
- C.
143
- D.
167
Correct Answer
C. 143Explanation
IMAP (Internet Message Access Protocol) is a protocol used for retrieving emails from a mail server. The port number associated with IMAP is 143. This port is used to establish a connection between an email client and the mail server, allowing the client to retrieve and manage emails stored on the server.Rate this question:
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- 8.
HTTP Port number?
- A.
21
- B.
23
- C.
67
- D.
80
Correct Answer
D. 80Explanation
The correct answer is 80. This is the default port number for HTTP (Hypertext Transfer Protocol), which is the protocol used for transmitting web pages and other resources on the internet. When a user types a URL into their web browser, the browser sends a request to the server on port 80 to retrieve the requested web page.Rate this question:
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- 9.
HTTPS/SSL Port number?
- A.
21
- B.
443
- C.
67
- D.
80
Correct Answer
B. 443Explanation
The correct answer is 443. HTTPS (Hypertext Transfer Protocol Secure) is the secure version of HTTP, and it uses SSL (Secure Sockets Layer) to encrypt data transmitted between a website and a user's browser. The default port for HTTPS/SSL is 443, which means that when a user accesses a website using HTTPS, the data is encrypted and transmitted through port 443 to ensure secure communication.Rate this question:
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- 10.
How many layers in the OSI model?
- A.
6
- B.
9
- C.
7
- D.
10
Correct Answer
C. 7Explanation
The OSI model is a conceptual framework that standardizes the functions of a communication system into seven different layers. Each layer has a specific role and interacts with the layers above and below it. Therefore, the correct answer is 7.Rate this question:
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- 11.
Which layer of the OSI Model does Network Cable operate at? (Choose the best answer)
- A.
Application
- B.
Presentation
- C.
Session
- D.
Transport
- E.
Network
- F.
Data-Link
- G.
Physical
Correct Answer
G. PhysicalExplanation
The network cable operates at the Physical layer of the OSI Model. This layer is responsible for the physical transmission of data between network devices. It defines the electrical, mechanical, and procedural aspects of the network interface, including the physical medium such as cables, connectors, and network devices. The Physical layer converts the digital data into signals that can be transmitted over the network cable and vice versa.Rate this question:
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- 12.
Which layer of the OSI Model does a hub operate at? (Choose the best answer)
- A.
Application
- B.
Presentation
- C.
Session
- D.
Transport
- E.
Network
- F.
Data-Link
- G.
Physical
Correct Answer
G. PhysicalExplanation
A hub operates at the physical layer of the OSI Model. The physical layer is responsible for the transmission and reception of raw data bits over a communication channel. A hub is a networking device that connects multiple devices in a network and allows them to communicate with each other. It receives data signals from one device and broadcasts them to all other devices connected to it. Hubs do not have any intelligence to interpret or manipulate data at higher layers of the OSI Model, which is why they operate at the physical layer.Rate this question:
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- 13.
Which layer of the OSI Model does a switch operate at? (Choose the best answer)
- A.
Application
- B.
Presentation
- C.
Session
- D.
Transport
- E.
Network
- F.
Data-Link
- G.
Physical
Correct Answer
F. Data-LinkExplanation
A switch operates at the Data-Link layer of the OSI Model. This layer is responsible for the reliable transfer of data between nodes on a network. Switches use MAC addresses to forward data packets to the appropriate destination device within a local area network (LAN). By operating at the Data-Link layer, switches are able to efficiently manage network traffic and improve network performance.Rate this question:
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- 14.
Which layer of the OSI Model does a router operate at? (Choose the best answer)
- A.
Application
- B.
Presentation
- C.
Session
- D.
Transport
- E.
Network
- F.
Data-Link
- G.
Physical
Correct Answer
E. NetworkExplanation
A router operates at the network layer of the OSI model. This layer is responsible for routing and forwarding data packets between different networks. Routers use IP addresses to determine the best path for data to travel between networks, making them key devices in connecting and directing traffic across the internet.Rate this question:
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- 15.
Which layer of the OSI Model does a NIC operate at? (Choose the best answer)
- A.
Application
- B.
Presentation
- C.
Session
- D.
Transport
- E.
Network
- F.
Data-Link
- G.
Physical
Correct Answer
F. Data-LinkExplanation
A NIC (Network Interface Card) operates at the Data-Link layer of the OSI Model. The Data-Link layer is responsible for the physical transmission of data between network nodes. The NIC handles tasks such as framing, error detection, and media access control, which are all part of the Data-Link layer's responsibilities.Rate this question:
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- 16.
How many bits in an IPV4 address?
- A.
32
- B.
28
- C.
16
- D.
8
Correct Answer
A. 32Explanation
An IPV4 address is made up of 32 bits. Each bit can be either a 0 or a 1, resulting in a total of 2^32 possible combinations, which is approximately 4.3 billion unique addresses. This address format is commonly used for internet protocol version 4.Rate this question:
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- 17.
How many bits in an Octet?
- A.
32
- B.
28
- C.
16
- D.
8
Correct Answer
D. 8Explanation
An octet consists of 8 bits.Rate this question:
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- 18.
How many bits in a class C default subnetmask?
- A.
32
- B.
24
- C.
16
- D.
8
Correct Answer
B. 24Explanation
A class C default subnet mask is represented by 24 bits. This means that the first 24 bits of the IP address are used to identify the network, while the remaining 8 bits are used to identify the host within that network.Rate this question:
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- 19.
How many bits in a class B default subnetmask?
- A.
32
- B.
24
- C.
16
- D.
8
Correct Answer
C. 16Explanation
A Class B default subnet mask is typically represented as 255.255.0.0 in decimal notation or /16 in CIDR notation. This means that the first 16 bits of the IP address are used to identify the network, while the remaining 16 bits are used to identify the hosts within the network. Therefore, the correct answer is 16.Rate this question:
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- 20.
How many bits in a class A default subnetmask?
- A.
32
- B.
24
- C.
16
- D.
8
Correct Answer
D. 8Explanation
The default subnet mask for a Class A network is 8 bits. A Class A network has a range of IP addresses from 1.0.0.0 to 126.0.0.0, with the first octet reserved for network identification. The default subnet mask for a Class A network is 255.0.0.0, which means that the first octet is used for network identification and the remaining three octets are available for host addresses. Since an IPv4 address is made up of 32 bits, and the default subnet mask for a Class A network uses 8 bits, the answer is 8.Rate this question:
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- 21.
Subnetting?
- A.
Dividing a network into smaller subgroups
- B.
Combining several IP network addresses into one IP address.
Correct Answer
A. Dividing a network into smaller subgroupsExplanation
Subnetting is the process of dividing a large network into smaller subgroups called subnets. This allows for better network management and improves efficiency in terms of addressing and routing. By dividing the network into smaller subgroups, it becomes easier to allocate IP addresses and manage network resources effectively. This helps in reducing network congestion and improving overall network performance.Rate this question:
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- 22.
Supernetting?
- A.
Dividing a network into smaller subgroups
- B.
Combining several IP network addresses into one IP address.
Correct Answer
B. Combining several IP network addresses into one IP address.Explanation
Supernetting is the process of combining multiple IP network addresses into one IP address. This is done by extending the subnet mask to include more bits, allowing for a larger range of IP addresses to be represented by a single address. By supernetting, organizations can reduce the number of routing table entries and improve network efficiency.Rate this question:
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- 23.
Layer 3 of the OSI Model
- A.
Application
- B.
Presentation
- C.
Session
- D.
Transport
- E.
Network
- F.
Data-Link
- G.
Physical
Correct Answer
E. NetworkExplanation
Layer 3 of the OSI Model is the Network layer. This layer is responsible for routing and forwarding data packets across different networks. It provides logical addressing and determines the best path for data transmission. The Network layer also handles congestion control and error handling. Therefore, the correct answer is Network.Rate this question:
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- 24.
ARP can perform duplicate IP address checks. True or False?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
ARP (Address Resolution Protocol) is a protocol used to map an IP address to a physical MAC address on a local network. When a device wants to communicate with another device on the network, it uses ARP to determine the MAC address associated with the IP address it wants to reach. In the process, ARP also checks if there are any duplicate IP addresses on the network. If a duplicate IP address is detected, ARP can notify the devices involved and help resolve the conflict. Therefore, the statement "ARP can perform duplicate IP address checks" is true.Rate this question:
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- 25.
Which of the following network technologies offers the highest bandwidth to PPP?
- A.
ISDN
- B.
DSL
- C.
Cable
- D.
SONET
Correct Answer
D. SONETExplanation
SONET (Synchronous Optical Networking) offers the highest bandwidth to PPP (Point-to-Point Protocol). SONET is a fiber optic network technology that provides high-speed data transmission over long distances. It offers very high bandwidth capacity, making it suitable for applications that require large amounts of data transfer, such as PPP connections. ISDN, DSL, and cable are also network technologies, but they offer lower bandwidth compared to SONET.Rate this question:
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- 26.
An IP host always broadcast an ARP request first, before checking to see if the necessary value is stored in its ARP cache. True or False?
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
An IP host does not always broadcast an ARP request first before checking its ARP cache. The host first checks its ARP cache to see if it has the necessary value. If the value is not found in the cache, then the host broadcasts an ARP request to obtain the necessary information. Therefore, the statement is false.Rate this question:
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- 27.
Which of the following services perform address hiding? (Choose all that apply.)
- A.
E-mail
- B.
FTP
- C.
NAT
- D.
Proxy
Correct Answer(s)
C. NAT
D. ProxyExplanation
NAT (Network Address Translation) and proxy are the services that perform address hiding. NAT hides the internal IP addresses of devices behind a single public IP address, allowing multiple devices to share a single public IP. Proxy servers act as intermediaries between clients and servers, hiding the client's IP address from the server by forwarding requests on behalf of the client. E-mail and FTP do not perform address hiding.Rate this question:
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- 28.
Which of the following protocols translates from a numeric IP address to a physical numeric address?
- A.
ICMP
- B.
IP
- C.
ARP
- D.
RARP
Correct Answer
C. ARPExplanation
ARP (Address Resolution Protocol) is the correct answer because it is the protocol used to translate from a numeric IP address to a physical numeric address. ARP is responsible for mapping an IP address to its corresponding MAC address on a local network. It allows devices on the same network to communicate with each other by resolving the IP address to the physical address.Rate this question:
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- 29.
Which of the following types of IP addresses includes the most host addresses?
- A.
Class A
- B.
Class B
- C.
Class C
- D.
Class D
- E.
Class E
Correct Answer
A. Class AExplanation
Class A IP addresses include the most host addresses because they have the largest network portion and the smallest host portion. Class A addresses have a range from 0.0.0.0 to 127.255.255.255, allowing for a total of 16,777,214 usable host addresses. This is because the first octet of a Class A address is used to identify the network, while the remaining three octets are used for host addresses.Rate this question:
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- 30.
Which of the following types of IP addresses includes the most network addresses?
- A.
Class A
- B.
Class B
- C.
Class C
- D.
Class D
- E.
Class E
Correct Answer
C. Class CExplanation
Class C IP addresses include the most network addresses. Class C addresses have a range of 192.0.0.0 to 223.255.255.255, with each address having 24 bits for the network portion and 8 bits for the host portion. This allows for a maximum of 2^24 or 16,777,216 unique network addresses. In comparison, Class A and Class B addresses have fewer network addresses available. Class D addresses are used for multicast purposes, and Class E addresses are reserved for experimental use.Rate this question:
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- 31.
How many bits in an IPv6 address?
- A.
32
- B.
64
- C.
128
Correct Answer
C. 128Explanation
An IPv6 address is made up of 128 bits. This is twice the size of an IPv4 address, which is composed of 32 bits. The larger address space in IPv6 allows for a significantly larger number of unique addresses, which is necessary to accommodate the growing number of devices connected to the internet.Rate this question:
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- 32.
The transisiton from IPv4 to IPv6 will happen from the ends of the Internet back to the core.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The explanation for the given correct answer is that the transition from IPv4 to IPv6 will happen from the ends of the Internet back to the core. This means that the adoption of IPv6 will start with individual devices and networks at the edges of the Internet and gradually move towards the core infrastructure. This approach allows for a smoother and more manageable transition, as it allows organizations and users to gradually upgrade their systems and infrastructure to support IPv6 without disrupting the overall functioning of the Internet.Rate this question:
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- 33.
How is IPv6 represented?
- A.
Dotted decimal notation
- B.
Hexadecimal
- C.
Quadraticimal
- D.
Hydoicimal
- E.
42
Correct Answer
B. HexadecimalExplanation
IPv6 is represented using hexadecimal notation. Hexadecimal is a base-16 numbering system that uses digits from 0 to 9 and letters from A to F. In IPv6, addresses are written as eight groups of four hexadecimal digits separated by colons. This representation allows for a larger address space compared to IPv4, which uses dotted decimal notation.Rate this question:
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