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352-001 · Question #798
352-001 Question #798: Real Exam Question with Answer & Explanation
The correct answer is C: 233.0.0.0 to 233.255.255.255. GLOP addressing, defined in RFC 3180, maps a 16-bit ASN into the second and third octets of the 233.0.0.0/8 multicast block to create globally unique, statically assigned multicast addresses.
Question
The network designer needs to use GLOP IP address in order make them unique within their ASN, which multicast address range will be considered?
Options
- A239.0.0.0 to 239.255.255.255
- B224.0.0.0 to 224.0.0.255
- C233.0.0.0 to 233.255.255.255
- D232.0.0.0 to 232.255.255.255
Explanation
GLOP addressing, defined in RFC 3180, maps a 16-bit ASN into the second and third octets of the 233.0.0.0/8 multicast block to create globally unique, statically assigned multicast addresses.
Common mistakes.
- A. The 239.0.0.0/8 range is the administratively scoped multicast address space defined in RFC 2365, intended for private, organizational use and not tied to ASN assignment.
- B. The 224.0.0.0/24 range contains link-local well-known multicast addresses reserved by IANA for routing protocols and other network infrastructure functions.
- D. The 232.0.0.0/8 range is reserved for Source-Specific Multicast (SSM) as defined in RFC 4607, which requires receivers to specify both the group and the source address.
Concept tested. GLOP multicast address range and ASN-based allocation
Reference. https://tools.ietf.org/html/rfc3180
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