What is the purpose of the TTL (Time-to-Live) field in an IP packet? MCQ with Answer and Explanation

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What is the purpose of the TTL (Time-to-Live) field in an IP packet?

A. To indicate packet length

B. To encrypt the packet

C. To prevent packets from looping indefinitely

D. To prioritize packets

Answer: Option C

Solution (By JKSSB Mock Tests)

TTL limits the lifespan of a packet; each hop decrements it, and when it reaches 0, the packet is discarded.

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Question #1

What is the maximum distance covered by a typical WAN?

A. Up to 1000 km or more

B. Up to 1 km

C. Up to 100 km

D. Up to 10 km

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Correct Answer: Option A

Explanation:
WAN (Wide Area Network) spans large geographical areas, often countries or continents.

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Question #2

Which of the following is a dynamic routing protocol?

A. OSPF

B. Routing table

C. Default routing

D. Static routing

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Correct Answer: Option A

Explanation:
OSPF (Open Shortest Path First) is a dynamic routing protocol that automatically adapts to network changes.

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Question #3

Which protocol is responsible for mapping a known logical IP address to its corresponding physical hardware MAC address on a local area network?

A. ICMP

B. ARP (Address Resolution Protocol)

C. DHCP

D. DNS

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Correct Answer: Option B

Explanation:
ARP operates within local subnets to discover the physical MAC address of a device when its logical IP address is already known.

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