Exam HPE7-A08 Topic 1 Question 97 Discussion
Actual exam question for HP's HPE7-A08 exam
Question #: 97
Topic #: 1
Question #: 97
Topic #: 1
A customer has connected a server to VLAN 100 on a 6300 switch which is streaming video using multicast group 224.0.0.100. This stream would need to be received by the clients in VLANs 200 and 300, routed on the same CX switch.
What needs to be done to enable the requirement?
What needs to be done to enable the requirement?
Suggested Answer: A Vote an answer
In the world of IP Multicast, the address range is strictly categorized by the IANA. Understanding these boundaries is a core requirement for the ACP-S switching exam.
* Link-Local Multicast (224.0.0.0/24): The address used in the scenario, 224.0.0.100 , falls within the " Local Network Control Block " (224.0.0.0 to 224.0.0.255). These addresses are reserved for protocol traffic that is intended to stay within a single broadcast domain (Layer 2). Examples include OSPF (224.0.0.5) and RIPv2 (224.0.0.9).
* The Routing Restriction: By design and industry standard, Layer 3 switches and routers do not forward traffic addressed to the 224.0.0.0/24 range. This is a hard-coded behavior to prevent control plane protocols from leaking into other parts of the network. Even if you enable PIM (Protocol Independent Multicast) and IGMP on all SVIs, the switch will drop these packets at the Layer 3 boundary.
* The Solution: To route multicast traffic between VLAN 100 and VLANs 200/300, the application must use a group address from the administratively scoped or globally scoped ranges (e.g., 239.0.0.0/8 or
224.0.1.0 and above).
* Why Option D is insufficient: While enabling IGMP and PIM on the SVIs is a necessary step for routable multicast, it will not overcome the fundamental architectural block placed on the 224.0.0.0/24 link-local range.
* Link-Local Multicast (224.0.0.0/24): The address used in the scenario, 224.0.0.100 , falls within the " Local Network Control Block " (224.0.0.0 to 224.0.0.255). These addresses are reserved for protocol traffic that is intended to stay within a single broadcast domain (Layer 2). Examples include OSPF (224.0.0.5) and RIPv2 (224.0.0.9).
* The Routing Restriction: By design and industry standard, Layer 3 switches and routers do not forward traffic addressed to the 224.0.0.0/24 range. This is a hard-coded behavior to prevent control plane protocols from leaking into other parts of the network. Even if you enable PIM (Protocol Independent Multicast) and IGMP on all SVIs, the switch will drop these packets at the Layer 3 boundary.
* The Solution: To route multicast traffic between VLAN 100 and VLANs 200/300, the application must use a group address from the administratively scoped or globally scoped ranges (e.g., 239.0.0.0/8 or
224.0.1.0 and above).
* Why Option D is insufficient: While enabling IGMP and PIM on the SVIs is a necessary step for routable multicast, it will not overcome the fundamental architectural block placed on the 224.0.0.0/24 link-local range.
by Franklin at Jul 02, 2026, 11:45 PM
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