A network engineer must migrate a router loopback interface to the IPv6 address space. If the current IPv4 address of the interface is 10.54.73.1/32, and the engineer configures IPv6 address 0:0:0:0:0

The correct answer is D. /128. The equivalent subnet mask in IPv6 for an IPv4 /32 subnet mask is /128. Here is an example: configure terminal interface loopback 0 ipv6 address 2001:db8::1/128 show interface loopback 0

Submitted by minji_kr· Mar 5, 2026Network Fundamentals

Question

A network engineer must migrate a router loopback interface to the IPv6 address space. If the current IPv4 address of the interface is 10.54.73.1/32, and the engineer configures IPv6 address 0:0:0:0:0:ffff:a36:4901, which prefix length must be used?

Options

A/64
B/96
C/124
D/128

How the community answered

(34 responses)

B
3% (1)
C
6% (2)
D
91% (31)

Explanation

The equivalent subnet mask in IPv6 for an IPv4 /32 subnet mask is /128. Here is an example: configure terminal interface loopback 0 ipv6 address 2001:db8::1/128 show interface loopback 0

Topics

#IPv6 addressing#prefix length#loopback interface#IPv4-mapped IPv6

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