PCNSE · Question #115
When performing the "ping" test shown in this CLI output: What will be the source address in the ICMP packet?
The correct answer is A. 10.46.64.94. In a typical network device ping operation, the source IP address of the ICMP packet is determined by the IP configured on the outgoing interface that the packet uses to reach its destination.
Question
When performing the "ping" test shown in this CLI output:
What will be the source address in the ICMP packet?
Exhibit
Options
- A10.46.64.94
- B10.30.0.93
- C192.168.93.1
- D10.46.72.93
How the community answered
(31 responses)- A94% (29)
- C3% (1)
- D3% (1)
Why each option
In a typical network device ping operation, the source IP address of the ICMP packet is determined by the IP configured on the outgoing interface that the packet uses to reach its destination.
When a `ping` command is executed on a network device, by default, the source IP address of the ICMP echo request packet is the IP address of the interface through which the packet is routed out towards the destination. Based on the unseen CLI output, 10.46.64.94 must be the IP address configured on the egress interface for the route to the ping target.
This IP address would be incorrect as a source address unless it was explicitly configured as the source for the ping or was the IP of the egress interface.
This IP address would be incorrect as a source address unless it was explicitly configured as the source for the ping or was the IP of the egress interface.
This IP address would be incorrect as a source address unless it was explicitly configured as the source for the ping or was the IP of the egress interface.
Concept tested: ICMP packet source address determination in CLI
Source: https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-cli-reference/tools-commands/ping
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