What is the main difference between a router and a switch? MCQ with Answer and Explanation

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What is the main difference between a router and a switch?

A. Router forwards based on MAC; switch forwards based on IP

B. Router operates at layer 2; switch at layer 3

C. Router forwards based on IP; switch forwards based on MAC

D. No difference

Answer: Option C

Solution (By JKSSB Mock Tests)

Routers use IP addresses (layer 3), switches use MAC addresses (layer 2).

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Question #1

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Which of the following is a private IP address designated for exclusive use within local area networks?

A. 168.192.1.1

B. 8.8.8.8

C. 200.100.50.1

D. 10.0.0.1

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Correct Answer: Option D

Explanation:
The 10.0.0.0 to 10.255.255.255 range is defined by RFC 1918 as a private Class A IP block reserved for internal networks.

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Question #2

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What is the role of a DNS resolver?

A. To query DNS servers for domain name resolution

B. To assign IP addresses

C. To filter traffic

D. To forward packets

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Correct Answer: Option A

Explanation:
A DNS resolver is a client that initiates queries to DNS servers to translate domain names.

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Question #3

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Which of the following is a Class A private IP address?

A. 172.16.1.1

B. 10.1.1.1

C. 192.168.1.1

D. 127.0.0.1

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Correct Answer: Option B

Explanation:
10.0.0.0/8 is Class A private range.

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