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HP HPE7-A08 Practice Test 30

Question 290

A core switch knows 10.2.0.0/16 but not a remote 172.20.5.0/24 behind 10.2.0.2. What route may be added?

  1. Inspect ARP neighbor resolution
  2. Enable routing between subnet interfaces
  3. Configure a default route
  4. Add a next-hop static route

Explanation

Correct Answer

D:

A static route points the remote prefix at a reachable peer. A static route sends a destination prefix to an explicit reachable next-hop router.

Incorrect Answers

A:

ARP maps local IPv4 next-hop addresses to MAC addresses on the directly connected segment. But this does not address the case requirement to forward packets toward a known next hop.

B:

Layer 3 forwarding must be available between interfaces to cross IP subnet boundaries. But this does not address the case requirement to forward packets toward a known next hop.

C:

A default prefix handles destinations for which more-specific routes are absent. But this does not address the case requirement to forward packets toward a known next hop.

Question 291

A branch has a single ISP router and unknown external networks should leave through it. What route is appropriate?

  1. Inspect ARP neighbor resolution
  2. Enable routing between subnet interfaces
  3. Add a next-hop static route
  4. Configure a default route

Explanation

Correct Answer

D:

A default route provides a fallback next hop. A default prefix handles destinations for which more-specific routes are absent.

Incorrect Answers

A:

ARP maps local IPv4 next-hop addresses to MAC addresses on the directly connected segment. But this does not address the case requirement to forward traffic with no specific matching route.

B:

Layer 3 forwarding must be available between interfaces to cross IP subnet boundaries. But this does not address the case requirement to forward traffic with no specific matching route.

C:

A static route sends a destination prefix to an explicit reachable next-hop router. But this does not address the case requirement to forward traffic with no specific matching route.

Question 292

Two VLANs have working local connectivity but no packets cross their subnet boundary. What function must be present?

  1. Apply prefix filtering at routing boundary
  2. Add a next-hop static route
  3. Configure VLAN SVI with valid address
  4. Enable routing between subnet interfaces

Explanation

Correct Answer

D:

Inter-subnet traffic needs IP routing on reachable gateways. Layer 3 forwarding must be available between interfaces to cross IP subnet boundaries.

Incorrect Answers

A:

Route policy determines which networks may be learned or advertised beyond the campus. But this does not address the case requirement to enable appropriate Layer 3 forwarding.

B:

A static route sends a destination prefix to an explicit reachable next-hop router. But this does not address the case requirement to enable appropriate Layer 3 forwarding.

C:

A switched virtual interface supplies a routed gateway for the associated VLAN subnet. But this does not address the case requirement to enable appropriate Layer 3 forwarding.

Question 293

A host gateway is directly connected but pinging its IP returns incomplete ARP entries. Which state should be inspected?

  1. Configure VLAN SVI with valid address
  2. Configure a default route
  3. Enable routing between subnet interfaces
  4. Inspect ARP neighbor resolution

Explanation

Correct Answer

D:

ARP resolution reveals local IP-to-MAC reachability. ARP maps local IPv4 next-hop addresses to MAC addresses on the directly connected segment.

Incorrect Answers

A:

A switched virtual interface supplies a routed gateway for the associated VLAN subnet. But this does not address the case requirement to resolve a directly connected next hop.

B:

A default prefix handles destinations for which more-specific routes are absent. But this does not address the case requirement to resolve a directly connected next hop.

C:

Layer 3 forwarding must be available between interfaces to cross IP subnet boundaries. But this does not address the case requirement to resolve a directly connected next hop.

Question 294

A routed campus advertises private lab prefixes to the carrier unexpectedly. Which control should be applied?

  1. Inspect ARP neighbor resolution
  2. Apply prefix filtering at routing boundary
  3. Configure a default route
  4. Configure VLAN SVI with valid address

Explanation

Correct Answer

B:

Route filters can constrain redistribution at the boundary. Route policy determines which networks may be learned or advertised beyond the campus.

Incorrect Answers

A:

ARP maps local IPv4 next-hop addresses to MAC addresses on the directly connected segment. But this does not address the case requirement to limit which IP prefixes are exported.

C:

A default prefix handles destinations for which more-specific routes are absent. But this does not address the case requirement to limit which IP prefixes are exported.

D:

A switched virtual interface supplies a routed gateway for the associated VLAN subnet. But this does not address the case requirement to limit which IP prefixes are exported.

Question 295

A workstation in VLAN 110 can communicate locally but no valid gateway address exists in that VLAN. What should the installer set up?

  1. Configure VLAN SVI with valid address
  2. Add a next-hop static route
  3. Apply prefix filtering at routing boundary
  4. Configure a default route

Explanation

Correct Answer

A:

An active VLAN interface with the correct prefix supports routing. A switched virtual interface supplies a routed gateway for the associated VLAN subnet.

Incorrect Answers

B:

A static route sends a destination prefix to an explicit reachable next-hop router. But this does not address the case requirement to create a gateway matching the user subnet.

C:

Route policy determines which networks may be learned or advertised beyond the campus. But this does not address the case requirement to create a gateway matching the user subnet.

D:

A default prefix handles destinations for which more-specific routes are absent. But this does not address the case requirement to create a gateway matching the user subnet.

Question 296

An upstream edge router has a route but the campus core lacks a return route to remote subnet 192.0.2.0/24. What is a suitable action?

  1. Add a next-hop static route
  2. Enable routing between subnet interfaces
  3. Configure VLAN SVI with valid address
  4. Inspect ARP neighbor resolution

Explanation

Correct Answer

A:

Add a reachable next-hop route for the missing network. A static route sends a destination prefix to an explicit reachable next-hop router.

Incorrect Answers

B:

Layer 3 forwarding must be available between interfaces to cross IP subnet boundaries. But this does not address the case requirement to restore a routed path to a known remote prefix.

C:

A switched virtual interface supplies a routed gateway for the associated VLAN subnet. But this does not address the case requirement to restore a routed path to a known remote prefix.

D:

ARP maps local IPv4 next-hop addresses to MAC addresses on the directly connected segment. But this does not address the case requirement to restore a routed path to a known remote prefix.

Question 297

A core can route among local VLANs but does not know how to reach public IPs. What should be checked?

  1. Enable routing between subnet interfaces
  2. Inspect ARP neighbor resolution
  3. Add a next-hop static route
  4. Configure a default route

Explanation

Correct Answer

D:

A valid default next hop is required if no dynamic route covers the Internet. A default prefix handles destinations for which more-specific routes are absent.

Incorrect Answers

A:

Layer 3 forwarding must be available between interfaces to cross IP subnet boundaries. But this does not address the case requirement to provide a fallback route out of campus.

B:

ARP maps local IPv4 next-hop addresses to MAC addresses on the directly connected segment. But this does not address the case requirement to provide a fallback route out of campus.

C:

A static route sends a destination prefix to an explicit reachable next-hop router. But this does not address the case requirement to provide a fallback route out of campus.

Question 298

Two CX routers have link carrier but one uses OSPF area 0 and its neighbor uses area 12. Which attribute prevents adjacency?

  1. Area ID agreement
  2. Matching authentication settings
  3. Layer 3 reachability and subnet agreement
  4. Compatible hello and dead intervals

Explanation

Correct Answer

A:

The neighboring interface area IDs need to match. OSPF neighbors on the same link must agree on the area assignment.

Incorrect Answers

B:

OSPF peers must have compatible authentication and credentials when authentication is enabled. But this does not address the case requirement to establish peers in the same OSPF area.

C:

OSPF peers on a common broadcast network need compatible IP addressing and link state. But this does not address the case requirement to establish peers in the same OSPF area.

D:

Neighbor hello/dead timing must be compatible for normal OSPF adjacency. But this does not address the case requirement to establish peers in the same OSPF area.

Question 299

An OSPF interface logs authentication failures after an operator rotates one side's secret. What should be aligned?

  1. Matching authentication settings
  2. Compatible hello and dead intervals
  3. OSPF neighbor state inspection
  4. Layer 3 reachability and subnet agreement

Explanation

Correct Answer

A:

Authentication type and key material must agree. OSPF peers must have compatible authentication and credentials when authentication is enabled.

Incorrect Answers

B:

Neighbor hello/dead timing must be compatible for normal OSPF adjacency. But this does not address the case requirement to authenticate routing protocol messages consistently.

C:

Neighbor-state output reveals progression from discovery to adjacency and possible stalls. But this does not address the case requirement to authenticate routing protocol messages consistently.

D:

OSPF peers on a common broadcast network need compatible IP addressing and link state. But this does not address the case requirement to authenticate routing protocol messages consistently.

Question 300

Two OSPF peers have mismatched hello/dead timers and never reach full state. What setting deserves review?

  1. Layer 3 reachability and subnet agreement
  2. Matching authentication settings
  3. Area ID agreement
  4. Compatible hello and dead intervals

Explanation

Correct Answer

D:

Hello and dead intervals are neighbor compatibility parameters. Neighbor hello/dead timing must be compatible for normal OSPF adjacency.

Incorrect Answers

A:

OSPF peers on a common broadcast network need compatible IP addressing and link state. But this does not address the case requirement to make OSPF timing consistent across a link.

B:

OSPF peers must have compatible authentication and credentials when authentication is enabled. But this does not address the case requirement to make OSPF timing consistent across a link.

C:

OSPF neighbors on the same link must agree on the area assignment. But this does not address the case requirement to make OSPF timing consistent across a link.

HPE Network Switching Professional (HPE7-A08) Practice Tests

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