Computer Networking MCQs

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

325 Total
Question #11 Report Error
What does a modem do?
A. Connects a LAN to a WAN by converting digital signals to analog and vice versa
B. Assigns IP addresses
C. Filters network traffic
D. Amplifies signals

Correct Answer: Option A


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 Report Error
Which of the following is a private IP address range?
A. 203.0.113.0 to 203.0.113.255
B. 192.168.0.0 to 192.168.255.255
C. 172.15.0.0 to 172.31.255.255
D. 10.0.0.0 to 10.255.255.255

Correct Answer: Option D


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 Report Error
Which IP address class has the first octet range of 1 to 126?
A. Class B
B. Class A
C. Class D
D. Class C

Correct Answer: Option B


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 Report Error
What is the default subnet mask for a Class C IP address?
A. 255.255.255.0
B. 255.255.255.255
C. 255.255.0.0
D. 255.0.0.0

Correct Answer: Option A


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 Report Error
Which network topology provides the highest redundancy because each device is connected to every other?
A. Ring
B. Star
C. Mesh
D. Bus

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 Report Error
What is the maximum number of hosts per network in a Class C IP address?
A. 126
B. 16,777,214
C. 65534
D. 254

Correct Answer: Option D


Explanation:
Class C provides 8 bits for hosts (2^8 - 2 = 254 usable hosts).

This question belongs to: Computer Computer Networking
Question #17 Report Error
Which OSI layer is responsible for routing and logical addressing?
A. Data link layer
B. Session layer
C. Network layer
D. Transport layer

Correct Answer: Option C


Explanation:
The network layer (Layer 3) handles routing and logical addressing like IP addresses.

This question belongs to: Computer Computer Networking
Question #18 Report Error
What is a MAC address?
A. A 48-bit physical address burned into the NIC
B. A 32-bit logical address
C. A 16-bit port number
D. A 64-bit address used for IPv6

Correct Answer: Option A


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 Report Error
Which device is used to connect multiple network segments and reduce collision domains?
A. Switch
B. Modem
C. Hub
D. Repeater

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 Report Error
What is the range of port numbers for well-known (system) ports in TCP/IP?
A. 1 to 255
B. 0 to 1023
C. 49152 to 65535
D. 1024 to 49151

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