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200-301 · Question #1491

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 C. 2001:db8:d955:1697:11D8:BFFF:FE69:1. 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 kwame.gh· Mar 5, 2026IP Connectivity

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 #1491 exhibit 1
200-301 question #1491 exhibit 2

Options

  • A2001:db8:d955:1697:1130:ABFF:FECC:1
  • B2001:db8:d955:1697:4657:149F:FE65:1
  • C2001:db8:d955:1697:11D8:BFFF:FE69:1
  • D2001:db8:d955:1697:12D8:BAFE:FF01:1

How the community answered

(35 responses)
  • A
    6% (2)
  • B
    14% (5)
  • C
    77% (27)
  • D
    3% (1)

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:d955:1697:1130:ABFF:FECC:1

This option contains an IPv6 address with a host identifier (`1130:ABFF:FECC:1`) that does not correspond to the EUI-64 conversion from the assumed MAC address for R2.

B2001:db8:d955:1697:4657:149F:FE65:1

This option presents an IPv6 address with a host identifier (`4657:149F:FE65:1`) that deviates from the correct EUI-64 format, indicating errors in either the FFFE insertion or the 7th bit inversion.

C2001:db8:d955:1697:11D8:BFFF:FE69:1Correct

An IPv6 EUI-64 interface identifier is formed by taking the 48-bit MAC address, splitting it, inserting FFFE in the middle, and then inverting the 7th bit of the first octet of the MAC. Given a MAC address like `13:D8:BF:69:01` for R2's LAN interface, applying these rules (e.g., `13` XOR `02` = `11`) to the network prefix `2001:db8:d955:1697::/64` yields the address `2001:db8:d955:1697:11D8:BFFF:FE69:1`.

D2001:db8:d955:1697:12D8:BAFE:FF01:1

This option contains an IPv6 address with a host identifier (`12D8:BAFE:FF01:1`) that would be derived from a different MAC address or an incorrect application of the EUI-64 conversion rules.

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

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