Which two GRE features are configured to prevent fragmentation? (Choose two.)

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Which two GRE features are configured to prevent fragmentation? (Choose two.)
A . TCP window size
B . TCP MSS
C . IP MTU
D . DF bit Clear
E . MTU ignore
F . PMTUD

Answer: B F

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edwin
edwin
2 years ago

Explanation

Explanation/Reference:
The ip tcp adjust-mss only affects TCP streams. Other kinds of IP traffic ?UDP, SCTP, DCCP, ICMP, ESP, AH, to name just a few- won’t be influenced by the ip tcp adjust-mss command, and so their datagrams must be fragmented at the IP layer. That’s why it is necessary to properly configure the ip mtu command to let the router know how large the fragments of non-TCP-carrying IP packets can be.
Explanation/Reference:
Reference: https://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/25885-pmtud-ipfrag.html

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