What is a MAC address? MCQ with Answer and Explanation

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What is a MAC address?

A. A 32-bit logical address

B. A 16-bit port number

C. A 48-bit physical address burned into the NIC

D. A 64-bit address used for IPv6

Answer: Option C

Solution (By JKSSB Mock Tests)

MAC (Media Access Control) address is a 48-bit unique identifier assigned to network interfaces.

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Question #1

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Which technology allows a network router to translate private internal LAN IP addresses into a single public internet address, conserving global IPv4 address space?

A. Domain Name mapping

B. Address Resolution lookup

C. Network Address Translation (NAT)

D. DHCP Allocation Pool

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Correct Answer: Option C

Explanation:
NAT maps private internal IP addresses to a public IP address, allowing multiple LAN devices to share a single internet connection.

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Question #2

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Which protocol is used for sending email between servers?

A. SMTP

B. POP3

C. IMAP

D. HTTP

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Correct Answer: Option A

Explanation:
SMTP (Simple Mail Transfer Protocol) is used for sending email from client to server and between servers.

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Question #3

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What is the main advantage of a star topology?

A. Easy to troubleshoot

B. Fault-tolerant

C. High redundancy

D. Low cost

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Correct Answer: Option A

Explanation:
Star topology simplifies troubleshooting because each connection is independent.

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