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 2 of 17
Question #21
Which network layer protocol is used for error reporting and diagnostic functions?
A. ARP
B. TCP
C. UDP
D. ICMP
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Correct Answer: Option D

Explanation:
ICMP (Internet Control Message Protocol) is used for error messages and diagnostics like ping.
This question belongs to: Computer Computer Networking
Question #22
What is the main difference between a hub and a switch?
A. Hub broadcasts to all ports; switch forwards to specific port based on MAC
B. Hub is intelligent; switch is not
C. Hub forwards data based on IP, switch based on MAC
D. Hub works at layer 3; switch at layer 2
Discuss
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Correct Answer: Option A

Explanation:
A hub sends data to all ports, while a switch learns MAC addresses and sends only to the destination port.
This question belongs to: Computer Computer Networking
Question #23
Which topology is commonly used in modern Ethernet networks?
A. Bus
B. Mesh
C. Ring
D. Star
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Correct Answer: Option D

Explanation:
Star topology with a central switch is the most common topology in modern Ethernet LANs.
This question belongs to: Computer Computer Networking
Question #24
What is the purpose of a default gateway?
A. To provide security by filtering packets
B. To route traffic from a local network to other networks
C. To assign IP addresses dynamically
D. To translate domain names to IP addresses
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Correct Answer: Option B

Explanation:
A default gateway is a router that connects a local network to external networks, forwarding traffic when the destination is not local.
This question belongs to: Computer Computer Networking
Question #25
What is the loopback IP address in IPv4?
A. 255.255.255.255
B. 0.0.0.0
C. 192.168.1.1
D. 127.0.0.1
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Correct Answer: Option D

Explanation:
127.0.0.1 is the loopback address used for testing network software on the local machine.
This question belongs to: Computer Computer Networking
Question #26
Which protocol is used to automatically assign IP addresses to devices in a network?
A. ICMP
B. DHCP
C. DNS
D. ARP
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Correct Answer: Option B

Explanation:
DHCP (Dynamic Host Configuration Protocol) dynamically assigns IP addresses and other network parameters.
This question belongs to: Computer Computer Networking
Question #27
What is a collision domain?
A. A domain where IP addresses are assigned
B. A broadcast domain
C. A set of network devices where collisions can occur
D. A group of routers
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Correct Answer: Option C

Explanation:
A collision domain is a network segment where packets can collide with each other if transmitted simultaneously.
This question belongs to: Computer Computer Networking
Question #28
Which network device operates at both physical and data link layers?
A. Router
B. Gateway
C. Hub
D. Switch
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Correct Answer: Option D

Explanation:
Switches operate at layer 2 (data link) and have physical layer capabilities for receiving/transmitting signals.
This question belongs to: Computer Computer Networking
Question #29
What is the maximum data rate of a standard Ethernet (10BASE-T) network?
A. 10 Mbps
B. 1 Gbps
C. 100 Mbps
D. 10 Gbps
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Correct Answer: Option A

Explanation:
10BASE-T offers 10 Mbps; it is the original Ethernet standard over twisted pair.
This question belongs to: Computer Computer Networking
Question #30
Which of the following topologies is most expensive to implement due to cabling?
A. Mesh
B. Star
C. Bus
D. Ring
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Correct Answer: Option A

Explanation:
Mesh topology requires a dedicated connection between every pair of nodes, making it the most expensive.
This question belongs to: Computer Computer Networking
Question #31
What is the purpose of a router's routing table?
A. Stores MAC addresses
B. Stores IP addresses and next-hop information for forwarding packets
C. Stores security policies
D. Stores domain name mappings
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Correct Answer: Option B

Explanation:
A routing table contains destination networks and the next hop to forward packets.
This question belongs to: Computer Computer Networking
Question #32
Which type of network is the Internet considered?
A. WAN
B. LAN
C. MAN
D. PAN
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Correct Answer: Option A

Explanation:
The Internet is the largest example of a WAN, spanning the entire globe.
This question belongs to: Computer Computer Networking
Question #33
What does the acronym ARP stand for?
A. Address Resolution Protocol
B. Access Resolution Protocol
C. Advanced Routing Protocol
D. Address Routing Protocol
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Correct Answer: Option A

Explanation:
ARP is used to map an IP address to a physical MAC address in a local network.
This question belongs to: Computer Computer Networking
Question #34
Which topology requires a central controller (like a hub or switch) to manage data transmission?
A. Star
B. Mesh
C. Ring
D. Bus
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Correct Answer: Option A

Explanation:
Star topology relies on a central device to which all nodes connect.
This question belongs to: Computer Computer Networking
Question #35
What is the size of an IPv4 address in bits?
A. 32
B. 16
C. 64
D. 128
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Correct Answer: Option A

Explanation:
IPv4 addresses are 32 bits long, typically expressed in dotted decimal.
This question belongs to: Computer Computer Networking
Question #36
Which protocol is used for reliable, connection-oriented data transmission?
A. IGMP
B. UDP
C. ICMP
D. TCP
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Correct Answer: Option D

Explanation:
TCP (Transmission Control Protocol) provides reliable, ordered, and error-checked delivery of data.
This question belongs to: Computer Computer Networking
Question #37
Which device can be used to extend the length of a network segment by regenerating the signal?
A. Repeater
B. Gateway
C. Router
D. Switch
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Correct Answer: Option A

Explanation:
A repeater amplifies and regenerates signals to extend the distance of a network.
This question belongs to: Computer Computer Networking
Question #38
What is the binary equivalent of the subnet mask 255.255.255.0?
A. 11111111.11111111.11111111.00000000
B. 00000000.00000000.00000000.11111111
C. 11111111.11111111.00000000.00000000
D. 11111111.00000000.00000000.00000000
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Correct Answer: Option A

Explanation:
255.255.255.0 in binary is 24 ones followed by 8 zeros.
This question belongs to: Computer Computer Networking
Question #39
Which of the following is a broadcast address for a network with subnet mask 255.255.255.0 and network IP 192.168.1.0?
A. 192.168.1.1
B. 192.168.1.0
C. 192.168.1.255
D. 192.168.1.254
Discuss
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Correct Answer: Option C

Explanation:
The broadcast address is the highest address in the subnet, i.e., 192.168.1.255 for a /24 network.
This question belongs to: Computer Computer Networking
Question #40
What does the acronym NIC stand for?
A. Network Interconnect Card
B. Network Interface Card
C. Network Integrated Circuit
D. Network Internet Controller
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Correct Answer: Option B

Explanation:
NIC is a hardware component that connects a computer to a network.
This question belongs to: Computer Computer Networking

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