Which of the following is the IPv6 unicast loopback address?

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Multiple Choice

Which of the following is the IPv6 unicast loopback address?

Explanation:
The main concept here is the IPv6 loopback address. In IPv6, the loopback address is represented as ::1, which is the 128-bit address 0:0:0:0:0:0:0:1. Writing it as ::1/128 indicates a single address on the host’s loopback interface. This is the IPv6 equivalent of IPv4’s 127.0.0.1 and is used to send traffic that stays within the local device for testing. The other options don’t fit because: - 127.0.0.1 is IPv4, not IPv6. - fe80::/10 covers link-local addresses, meant for on-link communication on a single network segment, not for loopback. - 2000::/3 is a large global unicast range, not a loopback address. So the correct IPv6 unicast loopback address is ::1/128.

The main concept here is the IPv6 loopback address. In IPv6, the loopback address is represented as ::1, which is the 128-bit address 0:0:0:0:0:0:0:1. Writing it as ::1/128 indicates a single address on the host’s loopback interface. This is the IPv6 equivalent of IPv4’s 127.0.0.1 and is used to send traffic that stays within the local device for testing.

The other options don’t fit because:

  • 127.0.0.1 is IPv4, not IPv6.

  • fe80::/10 covers link-local addresses, meant for on-link communication on a single network segment, not for loopback.

  • 2000::/3 is a large global unicast range, not a loopback address.

So the correct IPv6 unicast loopback address is ::1/128.

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