Computer Networking MCQs

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Computer Networking MCQs

Practice Computer Networking MCQs covering LAN, MAN, WAN, PAN, topology, modem, router, hub, switch and IP address concepts.

325
Total Questions

Practice Questions

Page 4 of 17
Question #61
Which topology is most commonly used in wireless networks?
A. Star
B. Ring
C. Mesh
D. Bus
Discuss
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Correct Answer: Option C

Explanation:
Wireless networks often use mesh or star-based topologies; mesh is common for Wi-Fi extended networks.
This question belongs to: Computer Computer Networking
Question #62
What is a network gateway?
A. A device that connects two different networks with different protocols
B. A device that amplifies signals
C. A device that connects computers in a LAN
D. A device that stores web pages
Discuss
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Correct Answer: Option A

Explanation:
A gateway acts as an entrance to another network, often translating protocols.
This question belongs to: Computer Computer Networking
Question #63
Which protocol is connectionless and does not guarantee delivery?
A. HTTP
B. FTP
C. UDP
D. TCP
Discuss
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Correct Answer: Option C

Explanation:
UDP (User Datagram Protocol) is connectionless and provides no guarantees of delivery, order, or error checking.
This question belongs to: Computer Computer Networking
Question #64
What is the purpose of a VLAN (Virtual LAN)?
A. To assign IP addresses
B. To logically segment a network without physical separation
C. To increase physical cable distance
D. To encrypt data
Discuss
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Correct Answer: Option B

Explanation:
VLANs divide a physical network into multiple logical networks for better management and security.
This question belongs to: Computer Computer Networking
Question #65
Which device is used to connect multiple computers in a LAN using twisted-pair cables?
A. Firewall
B. Modem
C. Router
D. Hub or switch
Discuss
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Correct Answer: Option D

Explanation:
Hubs and switches are used to interconnect devices within a LAN.
This question belongs to: Computer Computer Networking
Question #66
What does the acronym ISP stand for?
A. Internet Service Provider
B. Integrated Service Protocol
C. Interconnection Service Provider
D. Internal Service Protocol
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Correct Answer: Option A

Explanation:
ISP is a company that provides internet access to customers.
This question belongs to: Computer Computer Networking
Question #67
Which class of IP address has the first octet ranging from 128 to 191?
A. Class C
B. Class A
C. Class B
D. Class D
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Correct Answer: Option C

Explanation:
Class B addresses have first octet between 128 and 191.
This question belongs to: Computer Computer Networking
Question #68
What is the purpose of a network bridge?
A. To connect a LAN to the internet
B. To assign IP addresses
C. To amplify signals
D. To connect two network segments and reduce traffic by filtering
Discuss
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Correct Answer: Option D

Explanation:
Bridges filter and forward frames based on MAC addresses, connecting segments.
This question belongs to: Computer Computer Networking
Question #69
Which of the following is a valid MAC address format?
A. 2001:0db8:85a3:0000:0000:8a2e:0370:7334
B. 192.168.1.1
C. 00:1A:2B:3C:4D:5E
D. 255.255.255.0
Discuss
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Correct Answer: Option C

Explanation:
MAC addresses are 6 bytes (48 bits) in hexadecimal, separated by colons or hyphens.
This question belongs to: Computer Computer Networking
Question #70
In which type of network topology is a token used to control transmission?
A. Ring
B. Star
C. Mesh
D. Bus
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Correct Answer: Option A

Explanation:
Token Ring networks use a token-passing mechanism in a ring topology.
This question belongs to: Computer Computer Networking
Question #71
What is the range of dynamic ports in TCP/UDP?
A. 1024-49151
B. 0-1023
C. 49152-65535
D. 1-65535
Discuss
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Correct Answer: Option C

Explanation:
Dynamic or private ports are from 49152 to 65535, used for temporary sessions.
This question belongs to: Computer Computer Networking
Question #72
Which network device can operate at multiple layers of the OSI model?
A. Hub
B. Repeater
C. Router
D. Switch
Discuss
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Correct Answer: Option C

Explanation:
Routers operate at layer 3 (network) and sometimes higher, while switches at layer 2 and hubs at layer 1.
This question belongs to: Computer Computer Networking
Question #73
What is the main disadvantage of a ring topology?
A. A single break in the ring can disable the entire network
B. Requires a central hub
C. Difficult to manage
D. Expensive cabling
Discuss
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Correct Answer: Option A

Explanation:
In ring topology, if one link fails, the entire network fails unless it uses a dual-ring design.
This question belongs to: Computer Computer Networking
Question #74
Which protocol is used for sending email between servers?
A. IMAP
B. POP3
C. HTTP
D. SMTP
Discuss
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Correct Answer: Option D

Explanation:
SMTP (Simple Mail Transfer Protocol) is used for sending email from client to server and between servers.
This question belongs to: Computer Computer Networking
Question #75
What is the network address for a network with IP 192.168.1.150 and subnet mask 255.255.255.0?
A. 192.168.1.255
B. 192.168.1.0
C. 192.168.0.0
D. 192.168.1.150
Discuss
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Correct Answer: Option B

Explanation:
With a /24 mask, the network address is obtained by ANDing the IP with mask, resulting in 192.168.1.0.
This question belongs to: Computer Computer Networking
Question #76
Which device is used to connect a computer to a digital subscriber line (DSL) service?
A. DSL modem
B. Router
C. Switch
D. Cable modem
Discuss
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Correct Answer: Option A

Explanation:
A DSL modem connects a computer or router to the telephone line for DSL internet.
This question belongs to: Computer Computer Networking
Question #77
What is the purpose of a proxy server?
A. To act as an intermediary for client requests to servers
B. To connect network segments
C. To assign IP addresses
D. To forward packets based on IP
Discuss
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Correct Answer: Option A

Explanation:
A proxy server forwards requests and can provide caching, anonymity, and filtering.
This question belongs to: Computer Computer Networking
Question #78
Which topology is most suitable for fault-tolerant networks?
A. Star
B. Bus
C. Ring
D. Mesh
Discuss
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Correct Answer: Option D

Explanation:
Mesh topology provides multiple paths, so failure of one link does not disconnect the network.
This question belongs to: Computer Computer Networking
Question #79
What is the primary function of a switch's MAC address table?
A. To store routing information
B. To store IP addresses
C. To store domain names
D. To store mappings between MAC addresses and ports
Discuss
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Correct Answer: Option D

Explanation:
A switch's MAC address table learns which MAC address is associated with which port for efficient forwarding.
This question belongs to: Computer Computer Networking
Question #80
Which command is used to test network connectivity between two hosts?
A. ping
B. nslookup
C. ipconfig
D. tracert
Discuss
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Correct Answer: Option A

Explanation:
ping sends ICMP echo requests to test connectivity.
This question belongs to: Computer Computer Networking

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