200-301 Question #450: Real Exam Question with Answer & Explanation

The correct answer is A: ipv6 address 2001:db8::700:3:400F:572B. This question tests the ability to correctly compress an IPv6 address for easier configuration by applying standard compression rules.

Submitted by katya_ua· Mar 5, 2026IP Connectivity

Question

An engineer must configure the IPv6 address 2001:0db8:0000:0000:0700:0003:400F:572B on the serial0/0 interface of the HQ router and wants to compress it for easier configuration. Which command must be issued on the router interface?

Options

Aipv6 address 2001:db8::700:3:400F:572B
Bipv6 address 2001:db8:0::700:3:4F:572B
Cipv6 address 2001:Odb8::7:3:4F:572B
Dipv6 address 2001::db8:0000::700:3:400F:572B

Explanation

This question tests the ability to correctly compress an IPv6 address for easier configuration by applying standard compression rules.

Common mistakes.

B. This option incorrectly compresses '400F' to '4F' by removing a non-existent leading zero, and incorrectly compresses '0000:0000' to just one '0' then '::', which is not a valid compression.
C. This option incorrectly compresses 'db8' to 'd8' and '700' to '7', which are not valid IPv6 compression rules, and omits significant portions of the address incorrectly.
D. This option uses multiple double colons '::', which is not allowed in IPv6 compression as it would create ambiguity.

Concept tested. IPv6 address compression rules

Reference. https://learn.microsoft.com/en-us/windows/win32/winsock/ipv6-addressing-description

Topics

#IPv6 addressing#IPv6 compression#Cisco IOS IPv6 configuration

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