300-320 Question #380: Real Exam Question with Answer & Explanation

The correct answer is B: 232.0.0.0/8. Source-Specific Multicast (SSM) is defined in RFC 4607 and uses the reserved IP multicast address range 232.0.0.0/8 (232.0.0.0 through 232.255.255.255). SSM allows receivers to subscribe to multicast traffic from a specific source address combined with a group address, written as

Question

You need to use source specific multicast, which addressing should you use ?

Options

A224.0.0.0/8
B232.0.0.0/8
C248.0.0.0/8
D254.0.0.0/8
E242.0.0.0/8

Explanation

Source-Specific Multicast (SSM) is defined in RFC 4607 and uses the reserved IP multicast address range 232.0.0.0/8 (232.0.0.0 through 232.255.255.255). SSM allows receivers to subscribe to multicast traffic from a specific source address combined with a group address, written as (S,G). This model provides enhanced security and eliminates the need for shared trees and rendezvous points (RPs) used in ASM. The 224.0.0.0/8 range (A) is used for various well-known multicast groups and ASM. The ranges 248.0.0.0/8 (C), 254.0.0.0/8 (D), and 242.0.0.0/8 (E) are not valid IANA-assigned multicast address ranges - the entire multicast address space is 224.0.0.0/4 (224.0.0.0 to 239.255.255.255), so addresses starting with 248, 254, or 242 are not multicast addresses at all.

Community Discussion

No community discussion yet for this question.

Full 300-320 Practice