UGC NET PAPER 2 June 2019 Question 85 (Shift-I)

Question 85

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85. Consider the following two statements with respect to IPv4 in computer networking:
P: The loopback(IP) address is a member of class B network
Q: The loopback(IP) address is used to send a packet from host to itself
What can you say about the statements P and Q?

1. 1. P-True: Q-False
2. 2. P-False; Q-True
3. 3. P-True; Q-True
4. 4. P-False; Q-false

Answer : 2. P-False; Q-True

Explanation Question 85

• P: The loopback(IP) address is a member of class B network. Statement P is Flase.
  Explanation: The loopback(IP) address is a member of class A network. Any address between the range 127 . 0. 0. 0 to 127.255.255.255 can be used a loopback address but we can’t use 127 . 0. 0. 0 and 127.255.255.255 as loopback addresses.
• Q: The loopback(IP) address is used to send a packet from host to itself. Statement Q is True.
  Explanation: IPv4 network standards reserve the entire address block 127.0.0.0/8 (more than 16 million addresses) for loopback purposes. That means any packet sent to any of those addresses is looped back. A loopback address is a special IP address, 127.0.0.1, reserved by InterNIC for use in testing network cards.It also allows information technology professionals to test IP software without worrying about broken or corrupted drivers or hardware.

So, option 2 is correct answer

Reference : localhost - loopback(IP) address

Reference 2 : What is a loopback address?

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