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XK0-005 · Question #10180

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. The traceroute output indicates Host 2 has high packet loss and Host 3 is filtering ICMP echo packets, suggesting network congestion and firewall rules respectively.

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.)

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

(29 responses)
  • A
    3% (1)
  • B
    3% (1)
  • C
    72% (21)
  • D
    14% (4)
  • E
    7% (2)

Why each option

The `traceroute` output indicates Host 2 has high packet loss and Host 3 is filtering ICMP echo packets, suggesting network congestion and firewall rules respectively.

AHost 1 is set to filter ICMP reply packets.

Host 1 is not listed as filtering ICMP reply packets; it successfully responds and relays packets as shown by typical traceroute output.

BHost 1 is set to filter ICMP echo packets.

Host 1 is not filtering ICMP echo packets as it responds in the traceroute output.

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

High packet loss at Host 2 (indicated by `*` or repeated high delays/losses) suggests congestion on that link, which could be due to an overloaded connection or network device, requiring investigation by the network team.

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

While there might be low bandwidth, the traceroute output primarily shows high packet loss at Host 2, which is a more direct observation than inferring low bandwidth or ISP blocking traffic.

EHost 3 is set to filter ICMP reply packets.

Host 3 filtering ICMP *reply* packets is incorrect; it is filtering the *echo* requests, as indicated by the timeouts for the probes that traceroute sends to it.

FHost 3 is set to filter ICMP echo packets.Correct

Host 3 showing `***` or similar timeout for all probes indicates that it is not responding to ICMP echo requests (the packets used by traceroute), which is often a result of a firewall filtering ICMP packets.

Concept tested: Interpreting traceroute output for network troubleshooting

Source: https://man7.org/linux/man-pages/man8/traceroute.8.html

Topics

#Network Troubleshooting#Traceroute#ICMP#Packet Loss

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