What is the loopback address in IPv6? MCQ with Answer and Explanation

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What is the loopback address in IPv6?

A. 127.0.0.1

B. 0:0:0:0:0:0:0:1

C. ::1

D. Both A and C

Answer: Option D

Solution (By JKSSB Mock Tests)

In IPv6, loopback is ::1 (which is 0:0:0:0:0:0:0:1).

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Question #1

What is the range of dynamic ports in TCP/UDP?

A. 49152-65535

B. 0-1023

C. 1-65535

D. 1024-49151

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Correct Answer: Option A

Explanation:
Dynamic or private ports are from 49152 to 65535, used for temporary sessions.

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Question #2

What is the purpose of an Ethernet frame's preamble?

A. To carry data

B. To synchronize the sender and receiver

C. To indicate the frame length

D. To provide error detection

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Correct Answer: Option B

Explanation:
The preamble is a 7-byte pattern for synchronization and clock alignment.

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Question #3

What is the network address for a network with IP 192.168.1.150 and subnet mask 255.255.255.0?

A. 192.168.1.0

B. 192.168.0.0

C. 192.168.1.150

D. 192.168.1.255

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Correct Answer: Option A

Explanation:
With a /24 mask, the network address is obtained by ANDing the IP with mask, resulting in 192.168.1.0.

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