Transport vs. network layer o network layer: logical Household analogy: communication 12 kids sending letters to between hosts 12 kids O transport layer: logical o processes kids communication D app messages letters between processes in envelopes o relies on, enhances g hosts houses network layer services 口 transport protocol Ann and Bil o network-layer protocol E postal service Transport Layer 3-5Transport Layer 3-5 Transport vs. network layer  network layer: logical communication between hosts  transport layer: logical communication between processes  relies on, enhances, network layer services Household analogy: 12 kids sending letters to 12 kids  processes = kids  app messages = letters in envelopes  hosts = houses  transport protocol = Ann and Bill  network-layer protocol = postal service