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Question 350
IPTV works briefly after joining then stops when membership times out. Which VLAN service should be confirmed?
- IGMP membership learning
- Multicast router port identification
- IGMP querier availability
- Unknown multicast flooding control
Explanation
Correct Answer
C:Queries preserve group membership timers. Querying refreshes multicast membership and prevents stale or absent subscriber knowledge.
Incorrect Answers
A:IGMP snooping observes host membership reports to determine which switch ports need multicast traffic. But this does not address the case requirement to verify an active IGMP querier.
B:The snooping switch needs an appropriate path toward multicast routers and queriers where used. But this does not address the case requirement to verify an active IGMP querier.
D:Unknown groups may be flooded or filtered depending on configured policy and platform behavior. But this does not address the case requirement to verify an active IGMP querier.
Question 351
A multicast service fails only on certain receiver ports despite valid IP reachability. What operational table helps?
- Multicast VLAN alignment
- Multicast router port identification
- IGMP querier availability
- Multicast group-table verification
Explanation
Correct Answer
D:Learned group-port state indicates actual membership distribution. IGMP snooping state shows learned multicast group and port memberships.
Incorrect Answers
A:The multicast source and receivers must exist in a correctly supported VLAN topology. But this does not address the case requirement to compare subscriber join state by port.
B:The snooping switch needs an appropriate path toward multicast routers and queriers where used. But this does not address the case requirement to compare subscriber join state by port.
C:Querying refreshes multicast membership and prevents stale or absent subscriber knowledge. But this does not address the case requirement to compare subscriber join state by port.
Question 352
A multicast group must cross several routed campus subnets, not only one VLAN. What protocol family should be considered?
- Rendezvous point planning
- Reverse path forwarding check
- Enable multicast routing and PIM
- IGMP subscriber information
Explanation
Correct Answer
C:PIM handles routed multicast tree formation. PIM builds routed multicast distribution paths between multicast-capable routers where deployed.
Incorrect Answers
A:PIM sparse mode may require an RP mapping for shared-tree source discovery. But this does not address the case requirement to deliver multicast across Layer 3 links.
B:RPF validates that source multicast arrives on the expected route back toward its source. But this does not address the case requirement to deliver multicast across Layer 3 links.
D:Last-hop routers need receiver membership information to forward a group into the local VLAN. But this does not address the case requirement to deliver multicast across Layer 3 links.
Question 353
A router drops a multicast packet because it arrived on a link that is not the expected path to the source. What check failed?
- IGMP subscriber information
- Reverse path forwarding check
- Multicast route and interface state
- Unicast underlay routing prerequisite
Explanation
Correct Answer
B:RPF rejects packets received on an incorrect reverse-path interface. RPF validates that source multicast arrives on the expected route back toward its source.
Incorrect Answers
A:Last-hop routers need receiver membership information to forward a group into the local VLAN. But this does not address the case requirement to prevent looping or spoofed multicast source paths.
C:Multicast forwarding and PIM neighbor outputs reveal control-plane path health. But this does not address the case requirement to prevent looping or spoofed multicast source paths.
D:Multicast routing depends on valid unicast route knowledge for source and RPF decisions. But this does not address the case requirement to prevent looping or spoofed multicast source paths.
Question 354
PIM sparse-mode receivers cannot discover a source because RP mapping is absent. Which design item is relevant?
- Rendezvous point planning
- Enable multicast routing and PIM
- Reverse path forwarding check
- Multicast route and interface state
Explanation
Correct Answer
A:An appropriate RP can support shared-tree source discovery. PIM sparse mode may require an RP mapping for shared-tree source discovery.
Incorrect Answers
B:PIM builds routed multicast distribution paths between multicast-capable routers where deployed. But this does not address the case requirement to provide sparse-mode rendezvous service.
C:RPF validates that source multicast arrives on the expected route back toward its source. But this does not address the case requirement to provide sparse-mode rendezvous service.
D:Multicast forwarding and PIM neighbor outputs reveal control-plane path health. But this does not address the case requirement to provide sparse-mode rendezvous service.
Question 355
The routed multicast path is active but no last-hop hosts actually joined the group. What membership mechanism matters?
- IGMP subscriber information
- Unicast underlay routing prerequisite
- Reverse path forwarding check
- Enable multicast routing and PIM
Explanation
Correct Answer
A:IGMP indicates local receiver interest. Last-hop routers need receiver membership information to forward a group into the local VLAN.
Incorrect Answers
B:Multicast routing depends on valid unicast route knowledge for source and RPF decisions. But this does not address the case requirement to learn which local hosts requested the group.
C:RPF validates that source multicast arrives on the expected route back toward its source. But this does not address the case requirement to learn which local hosts requested the group.
D:PIM builds routed multicast distribution paths between multicast-capable routers where deployed. But this does not address the case requirement to learn which local hosts requested the group.
Question 356
An operator must find where a multicast group stopped being routed. Which outputs are useful?
- Rendezvous point planning
- Enable multicast routing and PIM
- Unicast underlay routing prerequisite
- Multicast route and interface state
Explanation
Correct Answer
D:PIM neighbors and multicast route entries show distribution state. Multicast forwarding and PIM neighbor outputs reveal control-plane path health.
Incorrect Answers
A:PIM sparse mode may require an RP mapping for shared-tree source discovery. But this does not address the case requirement to trace multicast forwarding through routers.
B:PIM builds routed multicast distribution paths between multicast-capable routers where deployed. But this does not address the case requirement to trace multicast forwarding through routers.
C:Multicast routing depends on valid unicast route knowledge for source and RPF decisions. But this does not address the case requirement to trace multicast forwarding through routers.
Question 357
RPF fails because the multicast source network is missing from the unicast route table. What prerequisite is broken?
- Unicast underlay routing prerequisite
- IGMP subscriber information
- Reverse path forwarding check
- Enable multicast routing and PIM
Explanation
Correct Answer
A:Unicast reachability supplies source-route information for RPF. Multicast routing depends on valid unicast route knowledge for source and RPF decisions.
Incorrect Answers
B:Last-hop routers need receiver membership information to forward a group into the local VLAN. But this does not address the case requirement to provide a valid reverse route to the source.
C:RPF validates that source multicast arrives on the expected route back toward its source. But this does not address the case requirement to provide a valid reverse route to the source.
D:PIM builds routed multicast distribution paths between multicast-capable routers where deployed. But this does not address the case requirement to provide a valid reverse route to the source.
Question 358
An IPTV stream appears on the wrong uplink and routers reject it despite a working IGMP join. What should be verified?
- Multicast route and interface state
- IGMP subscriber information
- Reverse path forwarding check
- Enable multicast routing and PIM
Explanation
Correct Answer
C:RPF follows the best-known route toward the source. RPF validates that source multicast arrives on the expected route back toward its source.
Incorrect Answers
A:Multicast forwarding and PIM neighbor outputs reveal control-plane path health. But this does not address the case requirement to align multicast ingress with reverse-path routing.
B:Last-hop routers need receiver membership information to forward a group into the local VLAN. But this does not address the case requirement to align multicast ingress with reverse-path routing.
D:PIM builds routed multicast distribution paths between multicast-capable routers where deployed. But this does not address the case requirement to align multicast ingress with reverse-path routing.
Question 359
A sparse-mode PIM design has no consistent rendezvous point for the group range. What planning step is missing?
- Rendezvous point planning
- IGMP subscriber information
- Multicast route and interface state
- Reverse path forwarding check
Explanation
Correct Answer
A:RP identification must be predictable across participating routers. PIM sparse mode may require an RP mapping for shared-tree source discovery.
Incorrect Answers
B:Last-hop routers need receiver membership information to forward a group into the local VLAN. But this does not address the case requirement to configure supported RP discovery or mapping.
C:Multicast forwarding and PIM neighbor outputs reveal control-plane path health. But this does not address the case requirement to configure supported RP discovery or mapping.
D:RPF validates that source multicast arrives on the expected route back toward its source. But this does not address the case requirement to configure supported RP discovery or mapping.
Question 360
A PIM neighbor is down on one interbuilding link and multicast stops there. What data should be collected?
- Unicast underlay routing prerequisite
- Rendezvous point planning
- IGMP subscriber information
- Multicast route and interface state
Explanation
Correct Answer
D:Neighbor and group forwarding states localize distribution faults. Multicast forwarding and PIM neighbor outputs reveal control-plane path health.
Incorrect Answers
A:Multicast routing depends on valid unicast route knowledge for source and RPF decisions. But this does not address the case requirement to inspect multicast routing control plane.
B:PIM sparse mode may require an RP mapping for shared-tree source discovery. But this does not address the case requirement to inspect multicast routing control plane.
C:Last-hop routers need receiver membership information to forward a group into the local VLAN. But this does not address the case requirement to inspect multicast routing control plane.
HPE Network Switching Professional (HPE7-A08) Practice Tests