200-301 Question #1113: Real Exam Question with Answer & Explanation

The correct answer is D: 2001:db8::5200:00ff:fe04:0000/64. Modified EUI-64 generates an IPv6 interface identifier by transforming a MAC address into a 64-bit value, which includes inserting FFFE and inverting the 7th bit of the first MAC address byte.

Submitted by suresh_in· Mar 5, 2026IP Connectivity

Question

Refer to the exhibit. Which format matches the Modified EUI-64 IPv6 interface address for the network 2001:db8::/64?

Options

A2001:db8::5000:00ff:fe04:0000/64
B2001:db8::4332:5800:41ff:fe06:/64
C2001:db8::5000:0004:5678:0090/64
D2001:db8::5200:00ff:fe04:0000/64

Explanation

Modified EUI-64 generates an IPv6 interface identifier by transforming a MAC address into a 64-bit value, which includes inserting FFFE and inverting the 7th bit of the first MAC address byte.

Common mistakes.

A. This option fails to correctly invert the 7th bit of the MAC address's first byte, retaining '50' instead of changing it to '52'.
B. This option's interface identifier does not follow the correct Modified EUI-64 conversion rules from the given MAC address.
C. This option does not include the mandatory 'FFFE' segment in the middle of the interface identifier as required by the EUI-64 format.

Concept tested. IPv6 Modified EUI-64 address generation

Reference. https://www.cisco.com/c/en/us/td/docs/ios/ipv6/configuration/guide/ipv6_address_config_c_ipv6-address-cfg-book/ipv6_address_config_c_ipv6-address-cfg-book_chapter_010.html

Topics

#Modified EUI-64#IPv6 Addressing#Interface ID

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