JN0-102 · Question #359
Which two ping command parameters whould be used to troubleshoot MTU issues? (Choose two.)
The correct answer is A. ping <destination> do-not-fragment D. ping <destination> size. To troubleshoot MTU issues using the ping command, the do-not-fragment parameter should be used to prevent packet fragmentation, and the size parameter should be used to test various packet sizes.
Question
Which two ping command parameters whould be used to troubleshoot MTU issues? (Choose two.)
Options
- Aping <destination> do-not-fragment
- Bping <destination> rapid
- Cping <destination> verbose
- Dping <destination> size
How the community answered
(28 responses)- A71% (20)
- B7% (2)
- C21% (6)
Why each option
To troubleshoot MTU issues using the ping command, the `do-not-fragment` parameter should be used to prevent packet fragmentation, and the `size` parameter should be used to test various packet sizes.
The `do-not-fragment` parameter (or `df` on some platforms) ensures that ping packets are not fragmented. If a packet larger than the path MTU is sent with this flag, it will be dropped, indicating an MTU mismatch.
`rapid` sends ping requests at a faster rate and is used for quick reachability checks or stress testing, not specifically for MTU discovery.
`verbose` provides additional output details about the ping process but does not directly assist in determining the MTU size itself.
The `size` parameter allows an administrator to specify the exact payload size of the ICMP echo request. By incrementally increasing the size while using `do-not-fragment`, the maximum path MTU can be precisely discovered.
Concept tested: Ping commands for MTU troubleshooting
Source: https://www.juniper.net/documentation/us/en/software/junos/routing-network-management/topics/ref/command/ping.html
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