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 1 of 17
Question #1
What is the full form of LAN in computer networking?
A. Large Area Network
B. Link Area Network
C. Local Area Network
D. Local Access Network
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Correct Answer: Option C

Explanation:
LAN stands for Local Area Network, which connects computers within a limited geographical area.
This question belongs to: Computer Computer Networking
Question #2
Which network type covers a city or metropolitan area?
A. PAN
B. WAN
C. MAN
D. LAN
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Correct Answer: Option C

Explanation:
MAN (Metropolitan Area Network) spans a city or large campus, larger than LAN but smaller than WAN.
This question belongs to: Computer Computer Networking
Question #3
What is the maximum distance covered by a typical WAN?
A. Up to 100 km
B. Up to 1000 km or more
C. Up to 1 km
D. Up to 10 km
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Correct Answer: Option B

Explanation:
WAN (Wide Area Network) spans large geographical areas, often countries or continents.
This question belongs to: Computer Computer Networking
Question #4
Which network is used for connecting personal devices like a smartphone and smartwatch?
A. LAN
B. WAN
C. MAN
D. PAN
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Correct Answer: Option D

Explanation:
PAN (Personal Area Network) is designed for short-range communication among personal devices, typically within 10 meters.
This question belongs to: Computer Computer Networking
Question #5
In a star topology, all devices are connected to a central device, which is usually a:
A. Router
B. Modem
C. Hub or switch
D. Bridge
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Correct Answer: Option C

Explanation:
In star topology, each node connects to a central hub or switch, making it easy to manage.
This question belongs to: Computer Computer Networking
Question #6
Which topology connects each device to exactly two other devices, forming a circular path?
A. Ring topology
B. Star topology
C. Mesh topology
D. Bus topology
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Correct Answer: Option A

Explanation:
Ring topology has each device connected to two others in a closed loop, with data passing in one direction.
This question belongs to: Computer Computer Networking
Question #7
What is the main disadvantage of a bus topology?
A. Difficult to add new devices
B. Requires a central hub
C. Single point of failure in the backbone
D. High cost
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Correct Answer: Option C

Explanation:
In bus topology, if the main cable (backbone) fails, the entire network goes down.
This question belongs to: Computer Computer Networking
Question #8
Which device connects different networks and forwards data packets based on IP addresses?
A. Hub
B. Modem
C. Switch
D. Router
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Correct Answer: Option D

Explanation:
A router operates at the network layer and routes packets between different networks using IP addresses.
This question belongs to: Computer Computer Networking
Question #9
At which layer of the OSI model does a hub operate?
A. Physical layer
B. Data link layer
C. Application layer
D. Network layer
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Correct Answer: Option A

Explanation:
A hub is a physical layer device that simply repeats signals to all ports without any intelligence.
This question belongs to: Computer Computer Networking
Question #10
Which device operates at the data link layer and uses MAC addresses to forward data?
A. Gateway
B. Switch
C. Hub
D. Router
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Correct Answer: Option B

Explanation:
A switch uses MAC addresses to forward frames within a local network, operating at layer 2.
This question belongs to: Computer Computer Networking
Question #11
What does a modem do?
A. Assigns IP addresses
B. Connects a LAN to a WAN by converting digital signals to analog and vice versa
C. Filters network traffic
D. Amplifies signals
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Correct Answer: Option B

Explanation:
A modem (modulator-demodulator) converts digital data from a computer to analog for transmission over telephone lines and vice versa.
This question belongs to: Computer Computer Networking
Question #12
Which of the following is a private IP address range?
A. 10.0.0.0 to 10.255.255.255
B. 172.15.0.0 to 172.31.255.255
C. 203.0.113.0 to 203.0.113.255
D. 192.168.0.0 to 192.168.255.255
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Correct Answer: Option A

Explanation:
10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 are private IP ranges. 10.x.x.x is valid.
This question belongs to: Computer Computer Networking
Question #13
Which IP address class has the first octet range of 1 to 126?
A. Class C
B. Class D
C. Class A
D. Class B
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Correct Answer: Option C

Explanation:
Class A addresses range from 1.0.0.0 to 126.255.255.255, with first bit 0.
This question belongs to: Computer Computer Networking
Question #14
What is the default subnet mask for a Class C IP address?
A. 255.255.255.255
B. 255.255.0.0
C. 255.255.255.0
D. 255.0.0.0
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Correct Answer: Option C

Explanation:
Class C has a default subnet mask of 255.255.255.0, providing up to 254 hosts.
This question belongs to: Computer Computer Networking
Question #15
Which network topology provides the highest redundancy because each device is connected to every other?
A. Bus
B. Ring
C. Mesh
D. Star
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Correct Answer: Option C

Explanation:
Full mesh topology connects each node to every other, offering multiple paths and high redundancy.
This question belongs to: Computer Computer Networking
Question #16
What is the maximum number of hosts per network in a Class C IP address?
A. 254
B. 126
C. 65534
D. 16,777,214
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Correct Answer: Option A

Explanation:
Class C provides 8 bits for hosts (2^8 - 2 = 254 usable hosts).
This question belongs to: Computer Computer Networking
Question #17
Which OSI layer is responsible for routing and logical addressing?
A. Transport layer
B. Session layer
C. Data link layer
D. Network layer
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Correct Answer: Option D

Explanation:
The network layer (Layer 3) handles routing and logical addressing like IP addresses.
This question belongs to: Computer Computer Networking
Question #18
What is a MAC address?
A. A 32-bit logical address
B. A 64-bit address used for IPv6
C. A 16-bit port number
D. A 48-bit physical address burned into the NIC
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Correct Answer: Option D

Explanation:
MAC (Media Access Control) address is a 48-bit unique identifier assigned to network interfaces.
This question belongs to: Computer Computer Networking
Question #19
Which device is used to connect multiple network segments and reduce collision domains?
A. Switch
B. Hub
C. Repeater
D. Modem
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Correct Answer: Option A

Explanation:
A switch isolates each port into a separate collision domain, reducing collisions.
This question belongs to: Computer Computer Networking
Question #20
What is the range of port numbers for well-known (system) ports in TCP/IP?
A. 49152 to 65535
B. 0 to 1023
C. 1024 to 49151
D. 1 to 255
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Correct Answer: Option B

Explanation:
Well-known ports are 0-1023, registered ports 1024-49151, and dynamic/private ports 49152-65535.
This question belongs to: Computer Computer Networking

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