Implementing Cisco IP Routing (CCNP ROUTE, legacy) — Question 347

How can you mitigate fragmentation issues between endpoints separated by a GRE tunnel?

Answer options

• A. PMTU
• B. TCP MSS
• C. windowing
• D. ICMP DF bit

Correct answer: B

Explanation

The correct answer is B, TCP MSS, as it helps in adjusting the maximum segment size to prevent fragmentation over the GRE tunnel. Options A and D relate to path MTU discovery and controlling fragmentation behavior but do not directly address the segment size adjustment for TCP. Option C, windowing, pertains to flow control in TCP sessions and is not related to fragmentation issues.