200-301 · Question #1507
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 D. 2001:db8:9bb6:6bb9:C801:B6FF:FEB8:1. The EUI-64 format generates an IPv6 interface ID by splitting a 48-bit MAC address, inserting FFFE in the middle, and flipping the 7th bit of the first byte.
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:db8:9bb6:6bb9:C801:B6FF:FFB4:1
- B2001:db8:9bb6:6bb9:C001:6BFE:FF01:1
- C2001:db8:9bb6:6bb9:4679:824F:FE88:1
- D2001:db8:9bb6:6bb9:C801:B6FF:FEB8:1
How the community answered
(27 responses)- A11% (3)
- B4% (1)
- C7% (2)
- D78% (21)
Why each option
The EUI-64 format generates an IPv6 interface ID by splitting a 48-bit MAC address, inserting FFFE in the middle, and flipping the 7th bit of the first byte.
This option does not correctly apply the EUI-64 transformation rules, specifically the insertion of FFFE and the flipping of the 7th bit from the presumed MAC address.
This option incorrectly generates the interface ID, as it does not follow the EUI-64 process of splitting the MAC, inserting FFFE, and flipping the 7th bit of the first octet.
This option shows an interface ID that is not derived by the EUI-64 method from a standard MAC address due to incorrect bit manipulation and FFFE insertion.
The EUI-64 process for an interface ID starts by taking a 48-bit MAC address (e.g., CA:01:B6:B8:00:01), inserting 'FFFE' in the middle (CA01:B6FF:FEB8:0001), and then flipping the 7th bit of the first byte (the Universal/Local bit). For the MAC address CA:01:B6:B8:00:01, the first byte CA (11001010 in binary) has its 7th bit (bit 6, 0-indexed from left) as 1; flipping this bit to 0 results in C8 (11001000), producing the interface ID C801:B6FF:FEB8:0001, which when combined with the prefix 2001:db8:9bb6:6bb9::/64 yields 2001:db8:9bb6:6bb9:C801:B6FF:FEB8:1.
Concept tested: IPv6 EUI-64 address generation
Source: https://learn.microsoft.com/en-us/windows/win32/iphlpapi/eui-64-address
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