Cisco CCNA Exam: Configuring Router Interfaces for IPv6 Connectivity

Configure Router R1 GigabitEthernet1/1 Interface to Connect to R2 GigabitEthernet1/1 Interface

Question

A network engineer must configure the router R1 GigabitEthernet1/1 interface to connect to the router R2 GigabitEthernet1/1 interface.

For the configuration to be applied, the engineer must compress the address 2001:0db8:0000:0000:0500:000a:400F:583B.

Which command must be issued on the interface?

Answers

Explanations

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A. B. C. D.

C.

The IPv6 address 2001:0db8:0000:0000:0500:000a:400F:583B is a 128-bit address, where each group of four hexadecimal digits represents a 16-bit value. The address is compressed by removing any leading zeros in each group and replacing consecutive groups of zeros with a double colon (::). However, only one double colon can be used in an IPv6 address.

To configure the router R1 GigabitEthernet1/1 interface to connect to the router R2 GigabitEthernet1/1 interface using the compressed IPv6 address, the correct command to issue on the interface is:

C. ipv6 address 2001:db8::500:a:400F:583B

Explanation: The double colon (::) is used to represent the consecutive groups of zeros in the compressed address, and only one double colon is used in an IPv6 address. Therefore, option A (ipv6 address 2001::db8:0000::500:a:400F:583B) is incorrect because it has two double colons. Option B (ipv6 address 2001:db8:0::500:a:4F:583B) is incorrect because it has an unnecessary zero in the third group, which can be omitted in the compressed address. Option D (ipv6 address 2001:0db8::5:a:4F:583B) is incorrect because it is not a compressed IPv6 address and still contains leading zeros.

Option C (ipv6 address 2001:db8::500:a:400F:583B) is the correct answer because it is a compressed IPv6 address with only one double colon, and it does not contain any leading zeros in the groups.