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Question 340
A newly routed office VLAN cannot obtain addresses from the datacenter DHCP server. What SVI function should be reviewed?
- DHCP scope and gateway accuracy
- DHCP relay helper configuration
- DNS resolver and default gateway option
- DHCP relay counters and reachability
Explanation
Correct Answer
B:The relay helper is required when the server is off-subnet. A VLAN gateway can forward client DHCP broadcasts to a remote configured DHCP server.
Incorrect Answers
A:The server must allocate addresses and option values appropriate to the requesting subnet. But this does not address the case requirement to forward DHCP discovery to the server.
C:Valid DHCP options must provide a reachable gateway and useful name resolution. But this does not address the case requirement to forward DHCP discovery to the server.
D:Relay forwarding state and server reachability identify which step loses a request. But this does not address the case requirement to forward DHCP discovery to the server.
Question 341
Guest and corporate have overlapping CIDR blocks on different VRFs but must remain isolated. What routing feature keeps them separate?
- DHCP relay helper configuration
- DHCP scope and gateway accuracy
- VRF route-table isolation
- Inter-VRF service policy
Explanation
Correct Answer
C:VRF isolation allows duplicate prefixes in distinct route tables. A VRF creates separate routing context for networks requiring controlled separation.
Incorrect Answers
A:A VLAN gateway can forward client DHCP broadcasts to a remote configured DHCP server. But this does not address the case requirement to preserve logical network separation.
B:The server must allocate addresses and option values appropriate to the requesting subnet. But this does not address the case requirement to preserve logical network separation.
D:Traffic between VRFs requires supported route leaking or a deliberate service and security boundary. But this does not address the case requirement to preserve logical network separation.
Question 342
A management VRF must reach a logging service in another context, but no route-leak design exists. What should be evaluated?
- Inter-VRF service policy
- VRF route-table isolation
- DHCP relay helper configuration
- DHCP scope and gateway accuracy
Explanation
Correct Answer
A:Controlled inter-VRF forwarding is distinct from default isolation. Traffic between VRFs requires supported route leaking or a deliberate service and security boundary.
Incorrect Answers
B:A VRF creates separate routing context for networks requiring controlled separation. But this does not address the case requirement to enable only approved management-to-service reachability.
C:A VLAN gateway can forward client DHCP broadcasts to a remote configured DHCP server. But this does not address the case requirement to enable only approved management-to-service reachability.
D:The server must allocate addresses and option values appropriate to the requesting subnet. But this does not address the case requirement to enable only approved management-to-service reachability.
Question 343
An IPTV feed should reach only ports with viewers rather than every access port. What function fits?
- IGMP membership learning
- IGMP querier availability
- Unknown multicast flooding control
- Multicast router port identification
Explanation
Correct Answer
A:IGMP snooping tracks subscriptions and constrains Layer 2 forwarding. IGMP snooping observes host membership reports to determine which switch ports need multicast traffic.
Incorrect Answers
B:Querying refreshes multicast membership and prevents stale or absent subscriber knowledge. But this does not address the case requirement to deliver streams only to interested receivers.
C:Unknown groups may be flooded or filtered depending on configured policy and platform behavior. But this does not address the case requirement to deliver streams only to interested receivers.
D:The snooping switch needs an appropriate path toward multicast routers and queriers where used. But this does not address the case requirement to deliver streams only to interested receivers.
Question 344
A switch learns subscriber groups but no traffic reaches a multicast router upstream. What port role should be inspected?
- Multicast router port identification
- Multicast group-table verification
- IGMP querier availability
- IGMP membership learning
Explanation
Correct Answer
A:The router-facing multicast path must be recognized. The snooping switch needs an appropriate path toward multicast routers and queriers where used.
Incorrect Answers
B:IGMP snooping state shows learned multicast group and port memberships. But this does not address the case requirement to forward membership and traffic toward the multicast router.
C:Querying refreshes multicast membership and prevents stale or absent subscriber knowledge. But this does not address the case requirement to forward membership and traffic toward the multicast router.
D:IGMP snooping observes host membership reports to determine which switch ports need multicast traffic. But this does not address the case requirement to forward membership and traffic toward the multicast router.
Question 345
Subscriber entries age out periodically because no device sends IGMP queries on the VLAN. What service is missing?
- Multicast group-table verification
- Multicast VLAN alignment
- IGMP querier availability
- Multicast router port identification
Explanation
Correct Answer
C:A querier maintains group membership information. Querying refreshes multicast membership and prevents stale or absent subscriber knowledge.
Incorrect Answers
A:IGMP snooping state shows learned multicast group and port memberships. But this does not address the case requirement to keep multicast subscriptions refreshed.
B:The multicast source and receivers must exist in a correctly supported VLAN topology. But this does not address the case requirement to keep multicast subscriptions refreshed.
D:The snooping switch needs an appropriate path toward multicast routers and queriers where used. But this does not address the case requirement to keep multicast subscriptions refreshed.
Question 346
Unregistered multicast traffic floods every user port, consuming bandwidth. Which policy category should be reviewed?
- IGMP membership learning
- Multicast router port identification
- Unknown multicast flooding control
- IGMP querier availability
Explanation
Correct Answer
C:Unknown-multicast handling controls flood behavior. Unknown groups may be flooded or filtered depending on configured policy and platform behavior.
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 avoid excessive multicast delivery.
B:The snooping switch needs an appropriate path toward multicast routers and queriers where used. But this does not address the case requirement to avoid excessive multicast delivery.
D:Querying refreshes multicast membership and prevents stale or absent subscriber knowledge. But this does not address the case requirement to avoid excessive multicast delivery.
Question 347
A stream source and receivers are placed in a VLAN absent from one transit trunk. What prerequisite is not met?
- Multicast VLAN alignment
- IGMP querier availability
- Multicast router port identification
- Multicast group-table verification
Explanation
Correct Answer
A:VLAN reachability is necessary for the Layer 2 multicast path. The multicast source and receivers must exist in a correctly supported VLAN topology.
Incorrect Answers
B:Querying refreshes multicast membership and prevents stale or absent subscriber knowledge. But this does not address the case requirement to carry the multicast VLAN across involved switches.
C:The snooping switch needs an appropriate path toward multicast routers and queriers where used. But this does not address the case requirement to carry the multicast VLAN across involved switches.
D:IGMP snooping state shows learned multicast group and port memberships. But this does not address the case requirement to carry the multicast VLAN across involved switches.
Question 348
An engineer wants to know which receivers joined group 239.1.1.5 on a CX switch. What state should be inspected?
- IGMP membership learning
- Multicast group-table verification
- Multicast VLAN alignment
- Multicast router port identification
Explanation
Correct Answer
B:Group-table membership maps multicast addresses to ports. IGMP snooping state shows learned multicast group and port memberships.
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 actual IGMP snooping subscriptions.
C:The multicast source and receivers must exist in a correctly supported VLAN topology. But this does not address the case requirement to verify actual IGMP snooping subscriptions.
D:The snooping switch needs an appropriate path toward multicast routers and queriers where used. But this does not address the case requirement to verify actual IGMP snooping subscriptions.
Question 349
Without snooping, a high-rate multicast video stream reaches desktops that never joined it. What configuration reduces traffic?
- Multicast group-table verification
- IGMP membership learning
- Multicast router port identification
- Multicast VLAN alignment
Explanation
Correct Answer
B:Learned IGMP group membership permits selective forwarding. IGMP snooping observes host membership reports to determine which switch ports need multicast traffic.
Incorrect Answers
A:IGMP snooping state shows learned multicast group and port memberships. But this does not address the case requirement to stop indiscriminate Layer 2 multicast flooding.
C:The snooping switch needs an appropriate path toward multicast routers and queriers where used. But this does not address the case requirement to stop indiscriminate Layer 2 multicast flooding.
D:The multicast source and receivers must exist in a correctly supported VLAN topology. But this does not address the case requirement to stop indiscriminate Layer 2 multicast flooding.
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.
HPE Network Switching Professional (HPE7-A08) Practice Tests