R$1.$ What is the difference between a host and an end system? List several different types of

end systems. Is a Web server an end system?

R$7.$ What is the transmission rate of Ethernet LANs?

R$8.$ What are some of the physical media that Ethernet can run over?

R$9.$ Dial$-$up modems, HFC$,$ DSL and FTTH are all used for residential access. For each of these

access technologies, provide a range of transmission rates and comment on whether the

transmission rate is shared or dedicated.

R$10.$ Describe the most popular wireless Internet access technologies today. Compare and

contrast them.

R$12.$ What advantage does a circuit$-$switched network have over a packet$-$switched network?

R$18.$ How long does it take a packet of length $1,000$ bytes to propagate over a link of distance

$2,500km,$ propagation speed $2\mathrm{.}5108\frac{m}{s},$ and transmission rate $2$ Mbps $?$ More generally, how

long does it take a packet of length $L$ to propagate over a link of distance $d,$ propagation speed

$s,$ and transmission rate $R$ bps$?$ Does this delay depend on packet length? Does this delay

depend on transmission rate?

R$23.$ What are the five layers in the Internet protocol stack? What are the principal

responsibilities of each of these layers?$|$