计算机网络作业题(2022年12月版).docx

计算机网络作业题(2022年12月版)
计算机网络作业题(2022年12月版)
第一章
1. Consider sending a packet of F bits over a path of Q links. Each link transmits at R bps. The network is lightly loaded so that there are no queuing delays. Propagation delay is negligible.
a. Suppose the network is a packet-switched virtual-circuit network. Denote the VC setup time by
t s seconds. Suppose the sending layers add a total of h bits of header to the packet. How long does it take to send the file from source to destination?
b. Suppose the network is a packet-switched datagram network and a connectionless service is
used. Now suppose each packet has 2h bits of header. How long does it take to send the packet?
c. Finally, suppose that the network is a circuit-switched network. Further suppose that the
transmission rate of the circuit between source and destination is R bps. Assuming t s setup time and h bits of header appended to the packet, how long does it take to send the packet?


1、
a. t s+(F+h)/R*Q
b.(F+2h)/R*Q
c. C.t s+(F+h)/R
6. This elementary problem begins to explore propagation delay and transmission delay, two central concepts in data networking. Consider two hosts, A and B, connected by a single link of rate R bps. Suppose that the two hosts are separated by