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200-301 · Question #1354

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 B. 2001:db8:1006:1968:1119:BEFF:FE67:1. The question requires determining the IPv6 address generated using the EUI-64 format from an unspecified router MAC address.

Submitted by cyberguy42· Mar 5, 2026IP Connectivity

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?

Exhibits

200-301 question #1354 exhibit 1
200-301 question #1354 exhibit 2

Options

  • A2001:db8:1006:1968:4564:877F:FE99:1
  • B2001:db8:1006:1968:1119:BEFF:FE67:1
  • C2001:db8:1006:1968:1130:ABFF:FECC:1
  • D2001:db8:1006:1968:12D8:BAFE:FF01:1

How the community answered

(29 responses)
  • A
    14% (4)
  • B
    79% (23)
  • C
    3% (1)
  • D
    3% (1)

Why each option

The question requires determining the IPv6 address generated using the EUI-64 format from an unspecified router MAC address.

A2001:db8:1006:1968:4564:877F:FE99:1

This address would be generated from a different MAC address after applying the EUI-64 rules, specifically if the first byte of the MAC address before the 7th bit flip was 47h.

B2001:db8:1006:1968:1119:BEFF:FE67:1Correct

An IPv6 EUI-64 interface ID is formed by splitting a 48-bit MAC address in half, inserting FFFE in the middle, and then flipping the 7th bit (the Universal/Local bit) of the first byte of the original MAC address. Assuming R1's MAC address is 13:19:BE:67:00:01, applying EUI-64 would result in an interface ID of 1119:BEFF:FE67:0001, which, when appended to the given prefix 2001:db8:1006:1968::/64, forms the complete IPv6 address 2001:db8:1006:1968:1119:BEFF:FE67:1.

C2001:db8:1006:1968:1130:ABFF:FECC:1

This address would be generated from a different MAC address and different EUI-64 segment than the one corresponding to the correct answer.

D2001:db8:1006:1968:12D8:BAFE:FF01:1

This address would be generated from a different MAC address after applying the EUI-64 rules, specifically if the first byte of the MAC address before the 7th bit flip was 10h.

Concept tested: IPv6 EUI-64 Address Generation

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic_connectivity/configuration/xe-3s/ipv6-basic-connectivity-xe-3s-book/ip6-eui64.html

Topics

#IPv6 EUI-64#IPv6 addressing#Router configuration

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