Which two addresses represent multicast addresses? (Choose two.)

The correct answer is A. 224.1.47.5 C. FF05::1. IPv4 multicast addresses occupy the Class D range 224.0.0.0 to 239.255.255.255, and IPv6 multicast addresses always begin with the FF prefix.

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Question

Options

A224.1.47.5
B240.100.22.3
CFF05::1
D2001::1

How the community answered

(22 responses)

A
91% (20)
B
5% (1)
D
5% (1)

Why each option

IPv4 multicast addresses occupy the Class D range 224.0.0.0 to 239.255.255.255, and IPv6 multicast addresses always begin with the FF prefix.

A224.1.47.5Correct

224.1.47.5 falls within the IANA-defined IPv4 Class D multicast range (224.0.0.0 to 239.255.255.255), making it a valid multicast address.

B240.100.22.3

240.100.22.3 falls in the Class E range (240.0.0.0 to 255.255.255.255), which is reserved for experimental use and is entirely separate from the multicast range.

CFF05::1Correct

FF05::1 is a valid IPv6 multicast address because all IPv6 multicast addresses begin with the FF prefix, and the 05 scope value indicates site-local multicast.

D2001::1

2001::1 is a global unicast IPv6 address - IPv6 multicast addresses must begin with FF, not with the 2001 prefix.

Concept tested: IPv4 and IPv6 multicast address ranges

Source: https://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml

Topics

#multicast address#IPv4 multicast#IPv6 multicast#address ranges

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