Forming the EUI-64 Suffix for Router R1 (Segment 8)

200-301 By islever Editorial Last updated

Configure and verify IPv6 addressing and prefix

Short answer

C Applying EUI-64 to R1's MAC yields 2001:db8:8bb3:8bb1:C801:B8FF:FEB3:1.

Question

Refer to the exhibit. The IPv6 address for the LAN segment on router R1 must be configured using the EUI-64 format. When configured which ipv6 address is produced by the router? - Exhibit: Forming the EUI-64 Suffix for Router R1 (Segment 8)
  1. 2001:db8:8bb3:8bb1:C001:8BFE:FF31:1
  2. 2001:db8:8bb3:8bb1:C081:B8FF:FF3B:1
  3. 2001:db8:8bb3:8bb1:C801:B8FF:FEB3:1 Correct Answer
  4. 2001:db8:8bb3:8bb4:7397:79FF:EF41:1

Key Takeaways

Same pattern: C8 from the flipped bit and the FFFE marker (B8FF) identify the correct option C.

EUI-64 on R1's MAC: invert the seventh bit to C8 (C801), insert FFFE (B8FF), and append the host half to produce FEB3, matching option C.

Common mistake: Picking A/B (C001/C081 miss the inversion) or D (no FFFE/inversion present).

Expert Analysis

Why the Answer Is Correct

C is correct. EUI-64 on R1's MAC: the first byte CA flips its seventh bit to C8, so the interface ID starts with C801, and the FFFE insertion gives B8FF, yielding 2001:db8:8bb3:8bb1:C801:B8FF:FEB3:1.

Why the Other Options Are Wrong

A (C001) and B (C081) miss the seventh-bit inversion. D does not follow the EUI-64 transformation of the exhibited MAC.

Community Comment Notes

The vote is C (100). Commenters derive CA -> C8 and confirm C801:B8FF as the resulting form.

Official Reference

https://learningnetwork.cisco.com/s/ccna-exam-topics

This link opens the official vendor documentation in a new tab.

Community Votes

C
100%

100% of anonymous learners picked answer C. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 5 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 5

  1. kitannnnn 👍 2 Answered C
    ca = 11001010 inverted 7th bit = 11001000 = c8 ans = c801:b6ff:feb4:0001
  2. ekansh_m 👍 2 Answered C
    Correct answer is C
  3. Ras_Al_Ghul 👍 1 Answered C
    convert 7th bit ca becomes c8
  4. 6353e2d 👍 1
    C is the correct answer
  5. exiledwl 👍 1 Answered C
    C is correct

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