200-301 Question #522: Real Exam Question with Answer & Explanation

The correct answer is A: ipv6 address 2001:DB8:0:1:C601:42FF:FE0F:7/64. To assign a unique 64-bit IPv6 address using EUI-64, the router's MAC address is extended with FFFE and a specific bit in the first byte is inverted.

Submitted by chen.hong· Mar 5, 2026IP Connectivity

Question

Refer to the exhibit. An engineer is configuring the HO router. Which IPv6 address configuration must be applied to the router fa0/1 interface for the router to assign a unique 64-brt IPv6 address to Itself?

Options

Aipv6 address 2001:DB8:0:1:C601:42FF:FE0F:7/64
Bipv6 address 2001:DB8:0:1:C601:42FE:800F:7/64
Cipv6 address 2001:DB8:0:1:FFFF:C601:420F:7/64
Dipv6 address 2001:DB8:0:1:FE80:C601:420F:7/64

Explanation

To assign a unique 64-bit IPv6 address using EUI-64, the router's MAC address is extended with FFFE and a specific bit in the first byte is inverted.

Common mistakes.

B. This option contains an incorrect interface identifier, as it does not correctly apply the EUI-64 bit inversion rule to the MAC address's first octet.

Concept tested. IPv6 EUI-64 address generation

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

Topics

#IPv6 EUI-64#IPv6 SLAAC#Router IPv6 configuration

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