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200-101 · Question #126

Refer to the exhibit. A technician is testing connection problems in the internetwork. What is the problem indicated by the output from HostA?

The correct answer is D. The gateway address of HostA is incorrect or not configured. The exhibit shows HostA cannot reach any remote network, which points to a missing or misconfigured default gateway rather than a problem deeper in the path.

Troubleshoot Basic Connectivity

Question

Refer to the exhibit. A technician is testing connection problems in the internetwork. What is the problem indicated by the output from HostA?

Exhibit

200-101 question #126 exhibit

Options

  • AThe routing on Router2 is not functioning properly.
  • BAn access list is applied to an interface of Router3.
  • CThe Fa0/24 interface of Switch1 is down.
  • DThe gateway address of HostA is incorrect or not configured.

How the community answered

(56 responses)
  • A
    9% (5)
  • B
    14% (8)
  • C
    4% (2)
  • D
    73% (41)

Why each option

The exhibit shows HostA cannot reach any remote network, which points to a missing or misconfigured default gateway rather than a problem deeper in the path.

AThe routing on Router2 is not functioning properly.

If Router2 routing were the problem, HostA would receive ICMP time exceeded or unreachable messages from a reachable next-hop, not a local failure at the first hop.

BAn access list is applied to an interface of Router3.

An ACL on Router3 would cause packets to be dropped deep in the path, producing timeouts or unreachable replies from Router3's address, not an immediate local error.

CThe Fa0/24 interface of Switch1 is down.

If Fa0/24 on Switch1 were down, HostA would not have link and could not send any frames at all, but the exhibit implies HostA is able to generate the output, indicating its local interface is up.

DThe gateway address of HostA is incorrect or not configured.Correct

When a host has no default gateway configured, or an incorrect one, it cannot forward packets beyond its local subnet. The output from HostA would show an immediate local failure such as 'Destination host unreachable' generated by HostA itself, not timeouts from intermediate routers. This distinguishes a gateway misconfiguration from routing or ACL issues that would produce responses from further hops.

Concept tested: Default gateway misconfiguration and host reachability

Source: https://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/13788-3.html

Topics

#default gateway#ping troubleshooting#host configuration#ICMP

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