CCNA: Cisco Certified Network Associate — Question 1103

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?

Answer options

• A. ipv6 address 2001:db8::700:3:400F:572B
• B. ipv6 address 2001:db8:0::700:3:4F:572B
• C. ipv6 address 2001::db8:0000::700:3:400F:572B
• D. ipv6 address 2001:0db8::7:3:4F:572B

Correct answer: A

Explanation

The correct command A uses the appropriate IPv6 address compression rules, removing leading zeros and using '::' to represent consecutive groups of zeros only once. Option B incorrectly compresses parts of the address and doesn't follow the rules for shortening. Option C uses '::' incorrectly, which is not allowed to be used more than once in an address. Option D also fails to correctly compress the address according to the IPv6 standards.