HP HPE7-A01 Practice Test 50
Question 490
A dual-stack campus host has a valid IPv6 prefix but cannot resolve its local default router's link-layer address. Which specific corrective design step best meets the stated campus requirement?
- Apply tightly scoped policy-based routing for authorized traffic while retaining correct ordinary routing for other hosts.
- Assign routed interfaces to the correct supported VRF and permit only approved inter-VRF access.
- Install a valid approved default route pointing to a reachable upstream gateway in the correct VRF.
- Restore valid IPv6 neighbor discovery behavior and approved gateway addressing while retaining required ICMPv6 control traffic.
Explanation
Correct Answer
D:Restore valid IPv6 neighbor discovery behavior and approved gateway addressing while retaining required ICMPv6 control traffic. IPv6 Neighbor Discovery replaces ARP for address resolution and requires particular ICMPv6 messages; overfiltering them blocks connectivity. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described ipv6 neighbor discovery and gateway reachability situation.
Incorrect Answers
A:Apply tightly scoped policy-based routing for authorized traffic while retaining correct ordinary routing for other hosts. This instead concerns policy-based routing exception. Policy routing can override ordinary destination-based decisions for explicitly matched traffic; overly broad matches cause path surprises. It would not implement the specifically required change. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
B:Assign routed interfaces to the correct supported VRF and permit only approved inter-VRF access. This instead concerns routing vrfs and tenant isolation. VRFs partition forwarding and routing instances; a VLAN alone is not an isolated routing domain when the gateway is misplaced. It would not implement the specifically required change. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
C:Install a valid approved default route pointing to a reachable upstream gateway in the correct VRF. This instead concerns static default route and next-hop reachability. A default route carries destinations with no more-specific match, but only a resolvable next hop and correct VRF can forward them. It would not implement the specifically required change. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
Question 491
A dual-stack campus host has a valid IPv6 prefix but cannot resolve its local default router's link-layer address. Following a targeted change, which acceptance test would most directly demonstrate success?
- Confirm selected test flows take the policy path and unmatched traffic follows the standard routing table.
- Verify each tenant route table is isolated and only intentional cross-VRF traffic is reachable.
- Verify neighbor resolution and successful approved IPv6 connectivity after clearing only the affected stale entry.
- Verify the active routing table and successful permitted traffic to a remote destination outside connected prefixes.
Explanation
Correct Answer
C:Verify neighbor resolution and successful approved IPv6 connectivity after clearing only the affected stale entry. IPv6 Neighbor Discovery replaces ARP for address resolution and requires particular ICMPv6 messages; overfiltering them blocks connectivity. The result tests actual working behavior, not merely a saved configuration. The decision applies to the described ipv6 neighbor discovery and gateway reachability situation.
Incorrect Answers
A:Confirm selected test flows take the policy path and unmatched traffic follows the standard routing table. This instead concerns policy-based routing exception. Policy routing can override ordinary destination-based decisions for explicitly matched traffic; overly broad matches cause path surprises. It would not establish that this function actually works. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
B:Verify each tenant route table is isolated and only intentional cross-VRF traffic is reachable. This instead concerns routing vrfs and tenant isolation. VRFs partition forwarding and routing instances; a VLAN alone is not an isolated routing domain when the gateway is misplaced. It would not establish that this function actually works. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
D:Verify the active routing table and successful permitted traffic to a remote destination outside connected prefixes. This instead concerns static default route and next-hop reachability. A default route carries destinations with no more-specific match, but only a resolvable next hop and correct VRF can forward them. It would not establish that this function actually works. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
Question 492
A dual-stack campus host has a valid IPv6 prefix but cannot resolve its local default router's link-layer address. The change fails acceptance. What is the safest targeted restoration action?
- Remove or revert the overly broad policy route and restore normal forwarding until its selectors are corrected.
- Return to the known-good IPv6 gateway and filtering configuration if the change breaks NDP.
- Restore the former tenant interface and VRF mappings if migration introduces unintended route exposure.
- Restore the prior reachable default route and remove the broken next-hop entry if the new path fails.
Explanation
Correct Answer
B:Return to the known-good IPv6 gateway and filtering configuration if the change breaks NDP. IPv6 Neighbor Discovery replaces ARP for address resolution and requires particular ICMPv6 messages; overfiltering them blocks connectivity. The focused rollback restores a known safe baseline before another change attempt. The decision applies to the described ipv6 neighbor discovery and gateway reachability situation.
Incorrect Answers
A:Remove or revert the overly broad policy route and restore normal forwarding until its selectors are corrected. This instead concerns policy-based routing exception. Policy routing can override ordinary destination-based decisions for explicitly matched traffic; overly broad matches cause path surprises. It would not safely roll back the relevant failed change. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
C:Restore the former tenant interface and VRF mappings if migration introduces unintended route exposure. This instead concerns routing vrfs and tenant isolation. VRFs partition forwarding and routing instances; a VLAN alone is not an isolated routing domain when the gateway is misplaced. It would not safely roll back the relevant failed change. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
D:Restore the prior reachable default route and remove the broken next-hop entry if the new path fails. This instead concerns static default route and next-hop reachability. A default route carries destinations with no more-specific match, but only a resolvable next hop and correct VRF can forward them. It would not safely roll back the relevant failed change. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
Question 493
A branch IPv6 VLAN reports intermittent neighbor entries because unsolicited neighbor advertisements conflict with expected gateway ownership. Before implementing a remedy, what should the engineer check first?
- Review ICMPv6 neighbor solicitation and advertisement exchange, interface reachability and neighbor cache state.
- Review route policy match order, source and destination selectors, configured next hop and fallback behavior.
- Review interface-to-VRF membership, route tables and explicit route-leaking policies for the tenant.
- Review the installed default route, next-hop resolution and reachable egress interface for the affected VRF.
Explanation
Correct Answer
A:Review ICMPv6 neighbor solicitation and advertisement exchange, interface reachability and neighbor cache state. IPv6 Neighbor Discovery replaces ARP for address resolution and requires particular ICMPv6 messages; overfiltering them blocks connectivity. The evidence check isolates the relevant prerequisite before a disruptive change. The decision applies to the described ipv6 neighbor discovery and gateway reachability situation.
Incorrect Answers
B:Review route policy match order, source and destination selectors, configured next hop and fallback behavior. This instead concerns policy-based routing exception. Policy routing can override ordinary destination-based decisions for explicitly matched traffic; overly broad matches cause path surprises. It does not isolate the cause of the stated incident. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
C:Review interface-to-VRF membership, route tables and explicit route-leaking policies for the tenant. This instead concerns routing vrfs and tenant isolation. VRFs partition forwarding and routing instances; a VLAN alone is not an isolated routing domain when the gateway is misplaced. It does not isolate the cause of the stated incident. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
D:Review the installed default route, next-hop resolution and reachable egress interface for the affected VRF. This instead concerns static default route and next-hop reachability. A default route carries destinations with no more-specific match, but only a resolvable next hop and correct VRF can forward them. It does not isolate the cause of the stated incident. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
Question 494
A branch IPv6 VLAN reports intermittent neighbor entries because unsolicited neighbor advertisements conflict with expected gateway ownership. After the root cause is confirmed, which narrowly scoped configuration action should be selected?
- Enforce tightly scoped policy-based routing for authorized traffic while retaining correct ordinary routing for other hosts.
- Map routed interfaces to the correct supported VRF and permit only approved inter-VRF access.
- Deploy a valid approved default route pointing to a reachable upstream gateway in the correct VRF.
- Reinstate valid IPv6 neighbor discovery behavior and approved gateway addressing while retaining required ICMPv6 control traffic.
Explanation
Correct Answer
D:Reinstate valid IPv6 neighbor discovery behavior and approved gateway addressing while retaining required ICMPv6 control traffic. IPv6 Neighbor Discovery replaces ARP for address resolution and requires particular ICMPv6 messages; overfiltering them blocks connectivity. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described ipv6 neighbor discovery and gateway reachability situation.
Incorrect Answers
A:Enforce tightly scoped policy-based routing for authorized traffic while retaining correct ordinary routing for other hosts. This instead concerns policy-based routing exception. Policy routing can override ordinary destination-based decisions for explicitly matched traffic; overly broad matches cause path surprises. It would not implement the specifically required change. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
B:Map routed interfaces to the correct supported VRF and permit only approved inter-VRF access. This instead concerns routing vrfs and tenant isolation. VRFs partition forwarding and routing instances; a VLAN alone is not an isolated routing domain when the gateway is misplaced. It would not implement the specifically required change. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
C:Deploy a valid approved default route pointing to a reachable upstream gateway in the correct VRF. This instead concerns static default route and next-hop reachability. A default route carries destinations with no more-specific match, but only a resolvable next hop and correct VRF can forward them. It would not implement the specifically required change. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
Question 495
A branch IPv6 VLAN reports intermittent neighbor entries because unsolicited neighbor advertisements conflict with expected gateway ownership. A deployment job reports success. Which observed result would actually validate the affected service?
- Verify selected test flows take the policy path and unmatched traffic follows the standard routing table.
- Confirm each tenant route table is isolated and only intentional cross-VRF traffic is reachable.
- Confirm neighbor resolution and successful approved IPv6 connectivity after clearing only the affected stale entry.
- Confirm the active routing table and successful permitted traffic to a remote destination outside connected prefixes.
Explanation
Correct Answer
C:Confirm neighbor resolution and successful approved IPv6 connectivity after clearing only the affected stale entry. IPv6 Neighbor Discovery replaces ARP for address resolution and requires particular ICMPv6 messages; overfiltering them blocks connectivity. The result tests actual working behavior, not merely a saved configuration. The decision applies to the described ipv6 neighbor discovery and gateway reachability situation.
Incorrect Answers
A:Verify selected test flows take the policy path and unmatched traffic follows the standard routing table. This instead concerns policy-based routing exception. Policy routing can override ordinary destination-based decisions for explicitly matched traffic; overly broad matches cause path surprises. It would not establish that this function actually works. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
B:Confirm each tenant route table is isolated and only intentional cross-VRF traffic is reachable. This instead concerns routing vrfs and tenant isolation. VRFs partition forwarding and routing instances; a VLAN alone is not an isolated routing domain when the gateway is misplaced. It would not establish that this function actually works. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
D:Confirm the active routing table and successful permitted traffic to a remote destination outside connected prefixes. This instead concerns static default route and next-hop reachability. A default route carries destinations with no more-specific match, but only a resolvable next hop and correct VRF can forward them. It would not establish that this function actually works. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
Question 496
A branch IPv6 VLAN reports intermittent neighbor entries because unsolicited neighbor advertisements conflict with expected gateway ownership. The review requires TWO complementary actions: one diagnostic check and one controlled configuration remedy. Select TWO actions that together meet those requirements.
- Review route policy match order, source and destination selectors, configured next hop and fallback behavior.
- Review ICMPv6 neighbor solicitation and advertisement exchange, interface reachability and neighbor cache state.
- Map routed interfaces to the correct supported VRF and permit only approved inter-VRF access.
- Reinstate valid IPv6 neighbor discovery behavior and approved gateway addressing while retaining required ICMPv6 control traffic.
Explanation
Correct Answers
B:Review ICMPv6 neighbor solicitation and advertisement exchange, interface reachability and neighbor cache state. IPv6 Neighbor Discovery replaces ARP for address resolution and requires particular ICMPv6 messages; overfiltering them blocks connectivity. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described ipv6 neighbor discovery and gateway reachability situation.
D:Reinstate valid IPv6 neighbor discovery behavior and approved gateway addressing while retaining required ICMPv6 control traffic. IPv6 Neighbor Discovery replaces ARP for address resolution and requires particular ICMPv6 messages; overfiltering them blocks connectivity. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described ipv6 neighbor discovery and gateway reachability situation.
Incorrect Answers
A:Review route policy match order, source and destination selectors, configured next hop and fallback behavior. This instead concerns policy-based routing exception. Policy routing can override ordinary destination-based decisions for explicitly matched traffic; overly broad matches cause path surprises. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
C:Map routed interfaces to the correct supported VRF and permit only approved inter-VRF access. This instead concerns routing vrfs and tenant isolation. VRFs partition forwarding and routing instances; a VLAN alone is not an isolated routing domain when the gateway is misplaced. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns ipv6 neighbor discovery and gateway reachability.
Question 497
A finance workstation must use a dedicated WAN uplink, but ordinary destination routing continues to choose the default provider. Which investigation would best isolate the immediate network dependency?
- Inspect interface-to-VRF membership, route tables and explicit route-leaking policies for the tenant.
- Inspect route policy match order, source and destination selectors, configured next hop and fallback behavior.
- Inspect the installed default route, next-hop resolution and reachable egress interface for the affected VRF.
- Inspect the destination address against all installed prefixes before comparing preference or metric within eligible routes.
Explanation
Correct Answer
B:Inspect route policy match order, source and destination selectors, configured next hop and fallback behavior. Policy routing can override ordinary destination-based decisions for explicitly matched traffic; overly broad matches cause path surprises. The evidence check isolates the relevant prerequisite before a disruptive change. The decision applies to the described policy-based routing exception situation.
Incorrect Answers
A:Inspect interface-to-VRF membership, route tables and explicit route-leaking policies for the tenant. This instead concerns routing vrfs and tenant isolation. VRFs partition forwarding and routing instances; a VLAN alone is not an isolated routing domain when the gateway is misplaced. It does not isolate the cause of the stated incident. The immediate problem concerns policy-based routing exception.
C:Inspect the installed default route, next-hop resolution and reachable egress interface for the affected VRF. This instead concerns static default route and next-hop reachability. A default route carries destinations with no more-specific match, but only a resolvable next hop and correct VRF can forward them. It does not isolate the cause of the stated incident. The immediate problem concerns policy-based routing exception.
D:Inspect the destination address against all installed prefixes before comparing preference or metric within eligible routes. This instead concerns longest prefix match over route metric. IP forwarding chooses the longest matching installed prefix before considering administrative preference or metric among equivalent candidates. It does not isolate the cause of the stated incident. The immediate problem concerns policy-based routing exception.
Question 498
A finance workstation must use a dedicated WAN uplink, but ordinary destination routing continues to choose the default provider. Which specific corrective design step best meets the stated campus requirement?
- Apply tightly scoped policy-based routing for authorized traffic while retaining correct ordinary routing for other hosts.
- Assign routed interfaces to the correct supported VRF and permit only approved inter-VRF access.
- Install a valid approved default route pointing to a reachable upstream gateway in the correct VRF.
- Remove or correct the erroneous more-specific route while preserving intended routing preference among equal-prefix candidates.
Explanation
Correct Answer
A:Apply tightly scoped policy-based routing for authorized traffic while retaining correct ordinary routing for other hosts. Policy routing can override ordinary destination-based decisions for explicitly matched traffic; overly broad matches cause path surprises. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described policy-based routing exception situation.
Incorrect Answers
B:Assign routed interfaces to the correct supported VRF and permit only approved inter-VRF access. This instead concerns routing vrfs and tenant isolation. VRFs partition forwarding and routing instances; a VLAN alone is not an isolated routing domain when the gateway is misplaced. It would not implement the specifically required change. The immediate problem concerns policy-based routing exception.
C:Install a valid approved default route pointing to a reachable upstream gateway in the correct VRF. This instead concerns static default route and next-hop reachability. A default route carries destinations with no more-specific match, but only a resolvable next hop and correct VRF can forward them. It would not implement the specifically required change. The immediate problem concerns policy-based routing exception.
D:Remove or correct the erroneous more-specific route while preserving intended routing preference among equal-prefix candidates. This instead concerns longest prefix match over route metric. IP forwarding chooses the longest matching installed prefix before considering administrative preference or metric among equivalent candidates. It would not implement the specifically required change. The immediate problem concerns policy-based routing exception.
Question 499
A finance workstation must use a dedicated WAN uplink, but ordinary destination routing continues to choose the default provider. Following a targeted change, which acceptance test would most directly demonstrate success?
- Verify each tenant route table is isolated and only intentional cross-VRF traffic is reachable.
- Verify the active routing table and successful permitted traffic to a remote destination outside connected prefixes.
- Verify a lookup for the exact affected destination selects the intended longest matching prefix.
- Confirm selected test flows take the policy path and unmatched traffic follows the standard routing table.
Explanation
Correct Answer
D:Confirm selected test flows take the policy path and unmatched traffic follows the standard routing table. Policy routing can override ordinary destination-based decisions for explicitly matched traffic; overly broad matches cause path surprises. The result tests actual working behavior, not merely a saved configuration. The decision applies to the described policy-based routing exception situation.
Incorrect Answers
A:Verify each tenant route table is isolated and only intentional cross-VRF traffic is reachable. This instead concerns routing vrfs and tenant isolation. VRFs partition forwarding and routing instances; a VLAN alone is not an isolated routing domain when the gateway is misplaced. It would not establish that this function actually works. The immediate problem concerns policy-based routing exception.
B:Verify the active routing table and successful permitted traffic to a remote destination outside connected prefixes. This instead concerns static default route and next-hop reachability. A default route carries destinations with no more-specific match, but only a resolvable next hop and correct VRF can forward them. It would not establish that this function actually works. The immediate problem concerns policy-based routing exception.
C:Verify a lookup for the exact affected destination selects the intended longest matching prefix. This instead concerns longest prefix match over route metric. IP forwarding chooses the longest matching installed prefix before considering administrative preference or metric among equivalent candidates. It would not establish that this function actually works. The immediate problem concerns policy-based routing exception.
Question 500
A finance workstation must use a dedicated WAN uplink, but ordinary destination routing continues to choose the default provider. The change fails acceptance. What is the safest targeted restoration action?
- Restore the former tenant interface and VRF mappings if migration introduces unintended route exposure.
- Restore the prior reachable default route and remove the broken next-hop entry if the new path fails.
- Remove or revert the overly broad policy route and restore normal forwarding until its selectors are corrected.
- Reinstate the last correct specific route and withdraw the unintended prefix before broad routing changes.
Explanation
Correct Answer
C:Remove or revert the overly broad policy route and restore normal forwarding until its selectors are corrected. Policy routing can override ordinary destination-based decisions for explicitly matched traffic; overly broad matches cause path surprises. The focused rollback restores a known safe baseline before another change attempt. The decision applies to the described policy-based routing exception situation.
Incorrect Answers
A:Restore the former tenant interface and VRF mappings if migration introduces unintended route exposure. This instead concerns routing vrfs and tenant isolation. VRFs partition forwarding and routing instances; a VLAN alone is not an isolated routing domain when the gateway is misplaced. It would not safely roll back the relevant failed change. The immediate problem concerns policy-based routing exception.
B:Restore the prior reachable default route and remove the broken next-hop entry if the new path fails. This instead concerns static default route and next-hop reachability. A default route carries destinations with no more-specific match, but only a resolvable next hop and correct VRF can forward them. It would not safely roll back the relevant failed change. The immediate problem concerns policy-based routing exception.
D:Reinstate the last correct specific route and withdraw the unintended prefix before broad routing changes. This instead concerns longest prefix match over route metric. IP forwarding chooses the longest matching installed prefix before considering administrative preference or metric among equivalent candidates. It would not safely roll back the relevant failed change. The immediate problem concerns policy-based routing exception.
