CISSP Practice question #79

In a EUI-64 mac addresses how many bits is the unique device identifier?
A: 40
B: 48
C: 12
D: 24

CBK 4: Communication and Network Security
Source: ThorTeaches.com practice tests

Answer


A: EUI/MAC-64 Mac addresses are 64bits. The first 24 are the manufacturer identifier. The last 40 are unique and identifies the host.

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29 Comments

  1. Answer: D: 24 bit

    The IPv6 EUI-64 format address is obtained through the 48-bit MAC address. The MAC address is first separated into two 24-bits, with one being OUI (Organizationally Unique Identifier) and the other being NIC specific. The 16-bit 0xFFFE is then inserted between these two 24-bits for the 64-bit EUI address.

    https://supportforums.cisco.com/t5/network-infrastructure-documents/understanding-ipv6-eui-64-bit-address/ta-p/3116953

  2. Answer: D: 24 bit

    The IPv6 EUI-64 format address is obtained through the 48-bit MAC address. The MAC address is first separated into two 24-bits, with one being OUI (Organizationally Unique Identifier) and the other being NIC specific. The 16-bit 0xFFFE is then inserted between these two 24-bits for the 64-bit EUI address.

    https://supportforums.cisco.com/t5/network-infrastructure-documents/understanding-ipv6-eui-64-bit-address/ta-p/3116953

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