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XK0-005 · Question #230

A junior systems administrator is diagnosing an issue with latency. The administrator issues the Given this scenario and the output, which of the following should be reported to the network team for…

The correct answer is C. Host 2 is experiencing high packet loss, indicating the link is overloaded. F. Host 3 is set to filter ICMP echo packets. When diagnosing network latency, consistent packet loss at an intermediate hop and non-responsiveness to ICMP probes from a host should be reported to the network team.

Troubleshooting

Question

A junior systems administrator is diagnosing an issue with latency. The administrator issues the Given this scenario and the output, which of the following should be reported to the network team for investigation? (Choose two.)

Exhibit

XK0-005 question #230 exhibit

Options

  • AHost 1 is set to filter ICMP reply packets.
  • BHost 1 is set to filter ICMP echo packets.
  • CHost 2 is experiencing high packet loss, indicating the link is overloaded.
  • DHost 2 is experiencing low bandwidth, indicating the ISP is blocking traffic.
  • EHost 3 is set to filter ICMP reply packets.
  • FHost 3 is set to filter ICMP echo packets.

How the community answered

(27 responses)
  • A
    4% (1)
  • C
    85% (23)
  • D
    4% (1)
  • E
    7% (2)

Why each option

When diagnosing network latency, consistent packet loss at an intermediate hop and non-responsiveness to ICMP probes from a host should be reported to the network team.

AHost 1 is set to filter ICMP reply packets.

Host 1 filtering ICMP reply packets would result in non-response from Host 1, but the problem identifies Host 3 as having filtering issues, not Host 1.

BHost 1 is set to filter ICMP echo packets.

Host 1 filtering ICMP echo packets would prevent Host 1 from responding to probes, but the identified issue is with Host 3, not Host 1.

CHost 2 is experiencing high packet loss, indicating the link is overloaded.Correct

High packet loss at Host 2, typically indicated by `* * *` for multiple probes in `traceroute` output, suggests network congestion or an overloaded link, which requires investigation by the network team.

DHost 2 is experiencing low bandwidth, indicating the ISP is blocking traffic.

While low bandwidth can cause issues, `traceroute` or `ping` directly indicate packet loss or high latency rather than explicitly low bandwidth or an ISP blocking traffic, which are more specific conclusions.

EHost 3 is set to filter ICMP reply packets.
FHost 3 is set to filter ICMP echo packets.Correct

If Host 3 consistently fails to respond to ICMP probes (e.g., all `* * *` for that hop in `traceroute` or a failed `ping`), it indicates that Host 3 or an intervening firewall is filtering incoming ICMP echo packets (requests), warranting a report to the network team.

Concept tested: Interpreting traceroute/ping output for network issues

Source: https://www.ibm.com/docs/en/aix/7.2?topic=commands-traceroute-command

Topics

#Network Troubleshooting#ICMP#Packet Loss#Firewall

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