Choosing an IPv6 loopback address | LinuC Level 1 102 Exam original practice question

1.07.1Basic

Communicate with the IPv6 stack on the same host without sending traffic to a physical network.

Which IPv6 address is the loopback?

Hint 1: Focus on protocol roles

Separate reliable transport, datagram transport, IP control messages, and name resolution before comparing the choices.

Hint 2: Key terms

Review the short definitions of transport protocols, control messages, and name resolution involved.

IPv6 loopback: The ::1/128 address used to refer to the local host.
IPv6 unspecified: The all-zero value that indicates no IPv6 interface address is selected.
Link-local: The fe80::/10 range that is valid only on the local link.
Multicast: An addressing mode that delivers to a selected group of receivers.

Detailed explanation

Correct::1

Correct. ::1 is the IPv6 loopback address.

Incorrect::

Incorrect. :: is the unspecified address.

Incorrectfe80::1

Incorrect. fe80::1 is link-local.

Incorrectff02::1

Incorrect. ff02::1 is a link-local all-nodes multicast address.

An example you can run in a temporary verification environment.

python3 -c "import ipaddress; print(ipaddress.ip_address('::1').is_loopback)"

True

Foundation review

The part of an IP address that identifies the network rather than a host.

TCP and UDP provide different delivery, reliability, and connection semantics.

A numbered endpoint used to deliver traffic to a network service.

Question IDKL-102-957

EnvironmentPython 3 ipaddress / 外部通信なし

Last technical review2026-08-13

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