200-301 · Question #1537
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?
The correct answer is C. 2001:db8:8bb3:8bb1:C801:B8FF:FEB3:1. The correct IPv6 address is generated by applying the EUI-64 format to the router's MAC address and combining it with the given network prefix.
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?
Options
- A2001:db8:8bb3:8bb1:C001:8BFE:FF31:1
- B2001:db8:8bb3:8bb1:C081:B8FF:FF3B:1
- C2001:db8:8bb3:8bb1:C801:B8FF:FEB3:1
- D2001:db8:8bb3:8bb4:7397:79FF:EF41:1
How the community answered
(41 responses)- A7% (3)
- B12% (5)
- C76% (31)
- D5% (2)
Why each option
The correct IPv6 address is generated by applying the EUI-64 format to the router's MAC address and combining it with the given network prefix.
The generated interface ID C001:8BFE:FF31:1 does not follow the correct EUI-64 transformation from the implicit MAC address in combination with the given prefix.
The generated interface ID C081:B8FF:FF3B:1 incorrectly places 'FFFE' or does not correctly apply the 7th bit inversion as per EUI-64 rules.
The EUI-64 format generates an IPv6 interface identifier by taking the 48-bit MAC address, splitting it into two 24-bit halves, inserting 'FFFE' in the middle, and then inverting the 7th bit of the first octet (the universal/local bit). Given an implicit MAC address of 88:01:B8:B3:00:01, applying this transformation results in C801:B8FF:FEB3:1, which when combined with the network prefix 2001:db8:8bb3:8bb1::/64 yields the correct IPv6 address.
The generated interface ID 7397:79FF:EF41:1 does not contain the 'FFFE' pattern correctly and its first octet is not derived by inverting the 7th bit of a MAC address according to EUI-64.
Concept tested: IPv6 EUI-64 address generation
Source: https://www.cisco.com/c/en/us/td/docs/ios/ipv6/configuration/guide/ipv6_addressing_cg/ip6_addr_ov.html#wp1055745
Topics
Community Discussion
No community discussion yet for this question.