1.1.e Explain TCP operations

1.1.e [i] IPv4 and IPv6 PMTU

path mtu for ipv6 is similar to that for ipv4, allowing for the discovery by a host of the MTU’s a packet will encounter along a data path. the big difference with ipv6 is that the source handles the fragmentation

http://my.safaribooksonline.com/book/networking/cisco/1587050862/ipv6-in-depth/ch03lev1sec2