Cisco IT Essentials Practice Test

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Which of the following represents the most compressed form of the IPv6 address 2001:0db8:cafe:0000:0835:0000:0000:0aa0/80?

2001:db8:cafe:0:835:0:0:0aa0/80

2001:db8:cafe:0:835::aa0/80

The most compressed form of the given IPv6 address, 2001:0db8:cafe:0000:0835:0000:0000:0aa0/80, is correctly represented as 2001:db8:cafe:0:835::aa0/80.

In IPv6 addressing, multiple techniques are used for compression to minimize the length of an address. One of the main methods is to eliminate leading zeros in each segment. For instance, in the address 2001:0db8:cafe:0000:0835:0000:0000:0aa0, leading zeros can be removed from the segments, simplifying 0db8 to db8, 0000 to 0, and 0aa0 to aa0. This is a key part of why the compressed form is more efficient and easier to read.

Additionally, IPv6 allows the use of double colons (::) to replace consecutive sections of zero segments, making it even more compact. In this case, the zeros in the segments after 835 can be compressed using the double colon. Since there are consecutive segments of zeros, replacing them with :: takes the address to its most concise format.

The final representation

2001:0db8:cafe:83:835::aa0/80

2001:db8:cafe:0000:835:0:0:aa0/80