Transport vs.network layer r network layer:logical Household analogy: communication 12 kids sending letters between hosts to 12 kids r transport layer:logical r processes kids communication r app messages letters between processes in envelopes m relies on,enhances, r hosts houses network layer services r transport protocol Ann and Bill r i network-layer protocol postal service Transport Layer 3-5Transport Layer 3-5 Transport vs. network layer r network layer: logical communication between hosts r transport layer: logical communication between processes m relies on, enhances, network layer services Household analogy: 12 kids sending letters to 12 kids r processes = kids r app messages = letters in envelopes r hosts = houses r transport protocol = Ann and Bill r network-layer protocol = postal service