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Maximum transmission unit (MTU) is a measurement in bytes of the largest data packets that an Internet-connected device can accept.
MSS, or maximum segment size, is the largest data payload that a device will accept from a network connection.
The normal or default MTU size typically used is 1500 bytes
TCP MSS is dependent on MTU in the Network layer. L3 MTU is depended on MTU in L2
MTU<maximum transmission unit>: Maximum size of frame or packet.
Datalink layer delivered MTU to Network Layer
The MTU is the maximum IP packet size for a given link.
Packets bigger than the MTU are fragmented at the point where the lower MTU is found and reassembled further down the chain. In Layer 2 and layer 3
<aside> 💡 Layer 3 MTU cannot be greater than Layer 2 MTU
</aside>
MSS<maximum segment size>: Maximum value of Payload to carried with TCP/IP Packet
MSS is 40bytes smaller than network layer MTU BY default MSS is 536 bytes assumed