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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.

Submitted by certguy· Mar 5, 2026

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

200-301 question #1484 exhibit 1
200-301 question #1484 exhibit 2

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)
  • A
    4% (1)
  • B
    74% (20)
  • C
    7% (2)
  • D
    15% (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.

A2001:db8:d945:91:12A0:AB34:FFCC:1

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.

B2001:db8:d945:91:11B0:ABFF:FECC:1Correct

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`.

C2001:db8:d945:91:4661:59FF:FF53:5

This option's IPv6 host identifier would be derived from a different MAC address or an incorrect application of the EUI-64 rules.

D2001:db8:d945:91:1130:ABFF:FECC:1

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

Topics

#IPv6 EUI-64#IPv6 Addressing#Interface ID

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