超星 - chapter4 network layer part1 - 查题吧

单选题

What is the name of a network-layer packet?

A. message
B. segment
C. datagram
D. frame

单选题

What are the two most important network-layer functions in a datagram network?

A. forwarding & routing
B. forwarding & filtering
C. routing & detecting
D. routing & checking

单选题

When a packet arrives at a router’s input link, the router must move the packet to the appropriate output link, this action is called ____?

A. Forwarding
B. routing
C. cut through
D. filtering

单选题

A router forwards a packet by examining the value of a field in the arriving packet’s header, and then using this value to index into the router’s forwarding table, this value is?

A. destination IP address
B. source IP address
C. destination MAC address
D. source MAC address

单选题

The network layer must determine the path taken by packets as they flow from a sender to a receiver. This action is called____?

A. Forwarding
B. routing
C. cut through
D. examine

单选题

IP belongs to ____ layer?

A. transport
B. network
C. data link
D. physical

单选题

Which layer provides host-to-host services?

A. transport
B. network
C. data link
D. physical

单选题

Which of the following is the default mask for the address 168.0.46.201?

A. 255.0.0.0
B. 255.255.0.0
C. 255.255.255.0
D. 255.255.255.255

3