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 3 of 17
Question #41
Which of the following is not a network topology?
A. Switch
B. Ring
C. Mesh
D. Star
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Correct Answer: Option A

Explanation:
Switch is a device, not a topology. Topologies include star, ring, bus, mesh, etc.
This question belongs to: Computer Computer Networking
Question #42
In which topology is it possible to add or remove devices without disrupting the entire network?
A. Ring
B. Bus
C. Mesh
D. Star
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Correct Answer: Option D

Explanation:
In star topology, each device is independently connected to the central hub, so adding/removing doesn't affect others.
This question belongs to: Computer Computer Networking
Question #43
What is the primary advantage of a switch over a hub?
A. Lower cost
B. No collisions due to dedicated bandwidth per port
C. Longer reach
D. Supports more devices
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Correct Answer: Option B

Explanation:
Switches create separate collision domains per port, eliminating collisions and improving performance.
This question belongs to: Computer Computer Networking
Question #44
Which address is used by a router to forward packets between networks?
A. MAC address
B. IP address
C. Physical address
D. Port number
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Correct Answer: Option B

Explanation:
Routers use IP addresses (network layer) to determine the destination network and forward packets.
This question belongs to: Computer Computer Networking
Question #45
What is the full form of MAN?
A. Metropolitan Area Network
B. Massive Area Network
C. Multiple Area Network
D. Medium Area Network
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Correct Answer: Option A

Explanation:
MAN stands for Metropolitan Area Network, covering a city or large campus.
This question belongs to: Computer Computer Networking
Question #46
Which class of IP address is used for multicast?
A. Class C
B. Class D
C. Class B
D. Class A
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Correct Answer: Option B

Explanation:
Class D (224.0.0.0 to 239.255.255.255) is reserved for multicast groups.
This question belongs to: Computer Computer Networking
Question #47
Which device connects a network to the Internet and often includes firewall functionality?
A. Router
B. Switch
C. Bridge
D. Hub
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Correct Answer: Option A

Explanation:
A router often connects a local network to the internet and may include security features like firewalls.
This question belongs to: Computer Computer Networking
Question #48
What is the maximum segment length for a 10BASE-T Ethernet network using twisted-pair cable?
A. 100 meters
B. 185 meters
C. 500 meters
D. 1000 meters
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Correct Answer: Option A

Explanation:
10BASE-T specifies a maximum cable segment length of 100 meters.
This question belongs to: Computer Computer Networking
Question #49
In ring topology, how is data transmitted?
A. In both directions simultaneously
B. Via broadcast
C. Through a central hub
D. In one direction around the ring
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Correct Answer: Option D

Explanation:
In ring topology, data travels in one direction from node to node until it reaches the destination.
This question belongs to: Computer Computer Networking
Question #50
Which network device is used to connect two different network segments and forward frames based on MAC addresses?
A. Router
B. Bridge
C. Hub
D. Repeater
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Correct Answer: Option B

Explanation:
A bridge connects two network segments and forwards frames based on MAC addresses, operating at layer 2.
This question belongs to: Computer Computer Networking
Question #51
What is the purpose of a subnet mask?
A. To encrypt data
B. To resolve domain names
C. To define the network portion and host portion of an IP address
D. To assign MAC addresses
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Correct Answer: Option C

Explanation:
A subnet mask separates the IP address into network and host bits.
This question belongs to: Computer Computer Networking
Question #52
Which of the following is a Class B private IP address range?
A. 10.0.0.0 to 10.255.255.255
B. 169.254.0.0 to 169.254.255.255
C. 172.16.0.0 to 172.31.255.255
D. 192.168.0.0 to 192.168.255.255
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Correct Answer: Option C

Explanation:
172.16.0.0/12 is a Class B private range.
This question belongs to: Computer Computer Networking
Question #53
Which protocol is used to resolve an IP address to a MAC address?
A. ARP
B. DHCP
C. RARP
D. DNS
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Correct Answer: Option A

Explanation:
ARP (Address Resolution Protocol) maps IP addresses to MAC addresses.
This question belongs to: Computer Computer Networking
Question #54
What is the effect of a network collision?
A. Data is duplicated
B. Data is lost and must be retransmitted
C. Network speed increases
D. Data is encrypted
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Correct Answer: Option B

Explanation:
Collisions corrupt data frames, requiring retransmission and reducing efficiency.
This question belongs to: Computer Computer Networking
Question #55
Which OSI layer is responsible for error detection and correction at the data link layer?
A. Transport layer
B. Data link layer
C. Network layer
D. Physical layer
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Correct Answer: Option B

Explanation:
The data link layer performs error detection (and sometimes correction) using frame check sequences.
This question belongs to: Computer Computer Networking
Question #56
What does the term broadcast domain mean?
A. A set of devices that can receive broadcast frames
B. A set of devices that can collide
C. A set of devices connected to a hub
D. A set of devices that share the same IP network
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Correct Answer: Option A

Explanation:
A broadcast domain is a logical division where a broadcast frame sent by one device can reach all other devices.
This question belongs to: Computer Computer Networking
Question #57
Which device creates separate broadcast domains?
A. Router
B. Repeater
C. Switch
D. Hub
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Correct Answer: Option A

Explanation:
Routers create separate broadcast domains because they do not forward broadcasts.
This question belongs to: Computer Computer Networking
Question #58
What is the maximum transmission unit (MTU) for Ethernet?
A. 64 bytes
B. 1518 bytes
C. 1460 bytes
D. 1500 bytes
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Correct Answer: Option D

Explanation:
The Ethernet MTU is 1500 bytes for the payload, not including headers.
This question belongs to: Computer Computer Networking
Question #59
Which IP address is used for limited broadcast within the local network?
A. 127.0.0.1
B. 255.255.255.255
C. 192.168.1.0
D. 0.0.0.0
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Correct Answer: Option B

Explanation:
255.255.255.255 is the limited broadcast address, used to send a packet to all nodes on the local network.
This question belongs to: Computer Computer Networking
Question #60
What is the function of a firewall in a network?
A. To resolve domain names
B. To route packets
C. To assign IP addresses
D. To allow or block network traffic based on rules
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Correct Answer: Option D

Explanation:
A firewall filters network traffic based on security rules to protect the network.
This question belongs to: Computer Computer Networking

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