Two key network-layer functions ,o forwarding: move analogy: packets from routers input to appropriate s routing: process of router output planning trip from source to dest .o routing: determine route taken by packets s forwarding:, process from source to dest of getting throug single interchange routing algorithms Network Layer 4-5Network Layer 4-5 Two key network-layer functions ❖ forwarding: move packets from router’s input to appropriate router output ❖ routing: determine route taken by packets from source to dest. ▪ routing algorithms analogy: ❖ routing: process of planning trip from source to dest ❖ forwarding: process of getting through single interchange