Which network layer protocol is used for error reporting and diagnostic functions? MCQ with Answer and Explanation

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Which network layer protocol is used for error reporting and diagnostic functions?

A. ARP

B. UDP

C. TCP

D. ICMP

Answer: Option D

Solution (By JKSSB Mock Tests)

ICMP (Internet Control Message Protocol) is used for error messages and diagnostics like ping.

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Question #1

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Which of the following IPv4 address blocks is strictly reserved by the IETF for private local area networks and is non-routable over the public internet?

A. 8.8.8.0 /24

B. 12.0.0.0 /8

C. 224.0.0.0 /4

D. 192.168.0.0 /16

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Correct Answer: Option D

Explanation:
The 192.168.0.0 to 192.168.255.255 range is a standard private IP address block designated by RFC 1918 for internal LAN use.

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Question #2

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What is the size of an IPv6 address in bits?

A. 128

B. 32

C. 256

D. 64

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Correct Answer: Option A

Explanation:
IPv6 addresses are 128 bits long, providing a huge address space.

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Question #3

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What type of network classification links computing nodes across an entire national state, global country, or international continent footprint?

A. MAN

B. WAN

C. LAN

D. PAN

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Correct Answer: Option B

Explanation:
A Wide Area Network (WAN) connects separate networks across broad geographic regions, such as countries or continents.

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