Chapter 4 The Network Layer1What is the name of a network-layer packet?（ ）A. message B. segment C. datagram D. frame 2What are the two most important network-layer functions in a datagram network? （ ）A. forwarding & routing B. forwarding & filteringC. routing & detecting D. routing & checking3When a packet arrives at a routers input link, the router must move the packet to the appropriate output link, this action is called _?
