It may as your cross different media. However, once on a particular media (physical or logical), or for the same kind of media, it's often same. I.e. its tends to be very static.
For instance, Ethernet and many WAN media support different MTUs. So if you go from LAN to WAN to LAN, the supported MTU might change from LAN to WAN to LAN. If the LAN on both ends is Ethernet, there's a good chance the MTU would be the same for them.
If MTU decreases along the path, and if a IP packet is larger, it can not be forwarded as is. It might be fragmented to fit the smaller MTU. If it is, if the MTU is later increased along the path, fragments are not recombined (until received by the destination).
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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