Network layer connection and connection-less service Odatagram network provides network-layer connectionless service VC network provides network-layer connection service analogous to the transport-layer services, but: o service:host-to-host o no choice:network provides one or the other o implementation:in network core Network Layer 4-11 Network Layer 4-11 Network layer connection and connection-less service  datagram network provides network-layer connectionless service  VC network provides network-layer connection service  analogous to the transport-layer services, but:  service: host-to-host  no choice: network provides one or the other  implementation: in network core