Cisco ENCOR Practice Exam 2025 – All-in-One Comprehensive Guide to Mastering Enterprise Network Core Technologies!

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What are the first 24 bits of a Multicast MAC address?

00:00:AB

01:00:5E

The first 24 bits of a multicast MAC address are designated as 01:00:5E. This specific address range is assigned by the IEEE for IPv4 multicast addresses, which means any device that is to process multicast packets will recognize this prefix.

In Ethernet networking, multicast MAC addresses are critical as they allow a single packet to be sent to multiple devices simultaneously. The structure of a multicast MAC address starts with the prefix 01:00:5E, which indicates that the address is intended for multicast traffic. The remaining 23 bits of the address are derived from the corresponding IPv4 address, essentially allowing the mapping of a specific IPv4 multicast address to the Ethernet multicast format.

The other options do not represent valid multicast MAC addresses within the specified frameworks. For instance, 00:00:AB does not align with the multicast designation, while FF:FF:FF represents the broadcast address, which is distinct from multicast.

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01:00:7E

FF:FF:FF

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