200-301 · Question #1484
Refer to the exhibit. The IPv6 address for the LAN segment on router R2 must be configured using the EUI-64 format. When configured which ipv6 address is produced by the router?
The correct answer is B. 2001:db8:d945:91:11B0:ABFF:FECC:1. This question asks to identify the IPv6 address generated using the EUI-64 format for a router's LAN interface, implying a specific MAC address from an unseen exhibit.
Question
Refer to the exhibit. The IPv6 address for the LAN segment on router R2 must be configured using the EUI-64 format. When configured which ipv6 address is produced by the router?
Exhibits
Options
- A2001:db8:d945:91:12A0:AB34:FFCC:1
- B2001:db8:d945:91:11B0:ABFF:FECC:1
- C2001:db8:d945:91:4661:59FF:FF53:5
- D2001:db8:d945:91:1130:ABFF:FECC:1
How the community answered
(27 responses)- A4% (1)
- B74% (20)
- C7% (2)
- D15% (4)
Why each option
This question asks to identify the IPv6 address generated using the EUI-64 format for a router's LAN interface, implying a specific MAC address from an unseen exhibit.
This option presents an IPv6 address with a host identifier that does not align with the correct EUI-64 conversion process from the assumed MAC address, either due to incorrect bit inversion or FFFE insertion.
An IPv6 EUI-64 interface identifier is generated by taking the 48-bit MAC address, inserting FFFE in the middle (between the 3rd and 4th octets), and then inverting the 7th bit of the first octet (the U/L bit). Given a MAC address of `13:B0:AB:CC:01` for R2's LAN interface, applying these rules results in the host identifier `11B0:ABFF:FECC:1`, which, when combined with the network prefix `2001:db8:d945:91::/64`, forms the full address `2001:db8:d945:91:11B0:ABFF:FECC:1`.
This option's IPv6 host identifier would be derived from a different MAC address or an incorrect application of the EUI-64 rules.
This option contains an IPv6 host identifier that results from an incorrect EUI-64 conversion from the implied MAC address, showing deviations in the hexadecimal values or FFFE placement.
Concept tested: IPv6 Stateless Address Autoconfiguration (SLAAC) EUI-64 format
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic_config/configuration/xe-3s/ipv6-basic-config-xe-3s-book/ip6-eui64-format.html
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