300-320 · Question #470
300-320 Question #470: Real Exam Question with Answer & Explanation
The correct answer is C: SSM; 232.0.0.0/8. Source-Specific Multicast (SSM) requires receivers to explicitly specify the source IP address when joining a multicast group. Only traffic from that configured source is forwarded, preventing unauthorized devices from transmitting to the group. SSM uses the reserved address rang
Question
Exhibit
Options
- APIM-SM; 232.0.0.0/8
- BASM; 232.0.0.0/8
- CSSM; 232.0.0.0/8
- DSSM; 224.0.0.0/8
Explanation
Source-Specific Multicast (SSM) requires receivers to explicitly specify the source IP address when joining a multicast group. Only traffic from that configured source is forwarded, preventing unauthorized devices from transmitting to the group. SSM uses the reserved address range 232.0.0.0/8. Any-Source Multicast (ASM) allows any source to send to a group address without explicit configuration, which does not meet the security requirement. PIM-SM (A, B) is the underlying protocol used with ASM and does not restrict sources. The 224.0.0.0/8 range (D) is used for ASM, not SSM.
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