Two Formats for IPv6 Address | 200-125 Cisco Exam | Cisco Certified Network Associate

### Question

In which two formats can the IPv6 address fd15:0db8:0000:0000:0700:0003:400F:572B be written? (Choose two.)

### Explanations

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A. B. C. D. E.

AE

IPv6 addresses can be represented in different formats, and it's important for network administrators to be able to recognize and use these different formats.

The given IPv6 address is: fd15:0db8:0000:0000:0700:0003:400F:572B.

To answer the question, we need to know the different formats of representing IPv6 addresses. The two most common formats are:

1. Colon-Hexadecimal Notation: This is the most common way of representing IPv6 addresses, where 16-bit groups are separated by colons (:). Each group is represented by a four-digit hexadecimal number, which can be shortened by removing leading zeros.

For example, the IPv6 address: fd15:0db8:0000:0000:0700:0003:400F:572B can be written in colon-hexadecimal notation as: fd15:db8:0:0:700:3:400f:572b

2. IPv6 Compressed Notation: This notation allows for consecutive groups of zeros to be represented with a double colon (::). However, the double colon can only be used once in an IPv6 address, and it can only replace consecutive groups of zeros.

For example, the IPv6 address: fd15:0db8:0000:0000:0700:0003:400F:572B can be written in compressed notation as: fd15:db8::700:3:400f:572b

Now, let's look at the answer choices:

A. fd15:0db8:0000:0000:700:3:400F:527B This answer is in colon-hexadecimal notation, but the third group is missing a leading zero. It should be fd15:db8:0:0:700:3:400f:527b.

B. fd15::db8::700:3:400F:527B This answer is in IPv6 compressed notation, but it has two consecutive colons between the second and third groups, and also between the fourth and fifth groups. It should be fd15::db8:0:700:3:400f:527b.

C. fd15:db8:0::700:3:4F:527B This answer is in IPv6 compressed notation, but it has an extra "F" in the seventh group. It should be fd15:db8:0::700:3:400f:527b.

D. fd15:0db8::7:3:4F:527B This answer is in IPv6 compressed notation, and it correctly represents the address with a double colon. However, the fifth group is missing a leading zero. It should be fd15:db8::7:3:400f:527b.

E. fd15:db8::700:3:400F:572B This answer is in IPv6 compressed notation, and it correctly represents the address with a double colon. The address is also correctly written in colon-hexadecimal notation, but it is missing a leading zero in the sixth group. It should be fd15:db8::700:3:400f:572b.

Therefore, the two correct answers are A and D.