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Question ID 15395

In computer networking a multicast address is an identifier for a group of hosts that
have joined a multicast group. Multicast addressing can be used in the Link Layer
(OSI Layer 2), such as Ethernet Multicast, as well as at the Internet Layer (OSI Layer
3) as IPv4 or IPv6 Multicast. Which two descriptions are correct regarding multicast
addressing?

Option A

The first 23 bits of the multicast MAC address are 0x01-00-5E. This is a reserved value that indicates a multicast application.

Option B

The last 3 bytes (24 bits) of the multicast MAC address are 0x01-00-5E. This is a reserved value that indicates a multicast application.

Option C

To calculate the Layer 2 multicast address, the host maps the last 23 bits of the IP address into the last 24 bits of the MAC address. The high-order bit is set to 0.

Option D

The first 3 bytes (24 bits) of the multicast MAC address are 0x01-00-5E. This is a reserved value that indicates a multicast application.

Correct Answer C,D
Explanation


Question ID 15396

In computer networking a multicast address is an identifier for a group of hosts that
have joined a multicast group. Multicast addressing can be used in the Link Layer
(OSI Layer 2), such as Ethernet Multicast, as well as at the Internet Layer (OSI Layer
3) as IPv4 or IPv6 Multicast. Which two descriptions are correct regarding multicast
addressing?

Option A

The first 23 bits of the multicast MAC address are 0x01-00-5E. This is a reserved value that indicates a multicast application.

Option B

The last 3 bytes (24 bits) of the multicast MAC address are 0x01-00-5E. This is a reserved value that indicates a multicast application.

Option C

To calculate the Layer 2 multicast address, the host maps the last 23 bits of the IP address into the last 24 bits of the MAC address. The high-order bit is set to 0.

Option D

The first 3 bytes (24 bits) of the multicast MAC address are 0x01-00-5E. This is a reserved value that indicates a multicast application.

Correct Answer C,D
Explanation

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