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Cisco 100-150 Exam - Topic 5 Question 11 Discussion

Actual exam question for Cisco's 100-150 exam

Question #: 11
Topic #: 5

[All 100-150 Questions]

What is the most compressed valid format of the IPv6 address 2001 :0db8:0000:0016:0000:001b: 2000:0056?

A2001:db8: : 16: : 1b:2:56

B2001:db8: : 16: : 1b: 2000: 56

C2001:db8: 16: :1b:2:56

D2001:db8: 0:16: :1b: 2000:56

Show Suggested Answer

Suggested Answer: D

IPv6 addresses can be compressed by removing leading zeros and replacing consecutive groups of zeros with a double colon (::). Here's how to compress the address 2001:0db8:0000:0016:0000:001b:2000:0056:

Remove leading zeros from each segment:

2001:db8:0000:0016:0000:001b:2000:0056 becomes 2001:db8:0:16:0:1b:2000:56

Replace the longest sequence of consecutive zeros with a double colon (::). In this case, the two consecutive zeros between the 16 and 1b:

2001:db8:0:16::1b:2000:56

Thus, the most compressed valid format of the IPv6 address is 2001:db8:0:16::1b:2000:56.

Cisco Learning Network

IPv6 Addressing (Cisco)

by Dahlia at Jul 19, 2026, 08:35 AM

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Chauncey

20 hours ago

I feel like C is simpler. Less zeros to deal with.

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Georgiann

6 days ago

I think the answer is B. It looks the most compressed.

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Freida

11 days ago

I thought it was supposed to be more compact than that!

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Cyril

16 days ago

Wait, can you really have two "::" in one address?

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Latanya

21 days ago

D seems off, not sure about that one.

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Kiley

27 days ago

I think C is the right answer. Looks clean.

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Nana

1 month ago

It's definitely not A, too many colons!

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Melynda

1 month ago

I’m leaning towards option C, but I’m not confident about the placement of the double colon.

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Bobbie

1 month ago

I feel like option A looks too cluttered with colons. I think it should be more streamlined.

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Taryn

2 months ago

I think I practiced a question like this, and I recall that you can only have one "::" in an address.

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Nell

2 months ago

I remember something about compressing leading zeros, but I'm not sure how many colons to use.

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