Day: March 24, 2019

CCNP R&S 006: Explain TCP and UDP operations

TCP IPv4 and IPv6 (P)MTU Maximum Transmission Unit (MTU) is the largest size Protocol Data Unit (PDU) that can be sent over the network. Higher MTU leads to a more efficient network as you can move more in a single packet/frame. In addition, Path MTU is the largest packet size along a given route from source to destination that can be sent without fragmentation. By setting the DF flag (or always in IPv6), routers that receive a packet that is larger than it’s MTU drops the packet and replies with an ICMP Unreachable (Datagram too big) message, also containing it’s MTU. The host will resend smaller packets until it reaches the destination.

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