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.
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
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)- A6% (2)
- B14% (5)
- C77% (27)
- D3% (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.
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.
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.
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`.
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
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