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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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While adjusting the tunnel interface's IP MTU is also a valid method to handle fragmentation (for both TCP and non-TCP traffic), the question specifically asks for a TCP setting that is tuned.
The TCP Maximum Segment Size (MSS) defines the largest segment of application data that a device can send in a single TCP packet, excluding TCP and IP headers. When using GRE/IP tunnels, the encapsulation adds extra headers, which reduces the available space for the payload. Tuning the MSS ensures that the TCP payload size fits within the tunnel's effective MTU after accounting for the added headers, minimizing the risk of fragmentation. While MTU determines the largest packet size a network can handle without fragmentation, the TCP MSS specifically tunes the payload size to avoid exceeding the MTU in the context of encapsulated traffic.
This is really confusing. but after reading in the following link, it A for sure. https://networkdirection.net/articles/network-theory/mtu-and-mss/