請大家幫忙!我姐姐的期中作業.對不起.佔版面...

請大家幫幫忙..會幾題都沒關係..只要你們願意幫忙解題..因為我都不會..而我老姐他們班的也都沒有人會寫....請大家幫忙!謝謝
　 1.What are the five layer other than session layer and presentation layer ? What are the functions in each layer ?

2.Suppose the signal transition occurs 10六次方 timw per second and there are two signal levels,representing either 0 or 1.What are the baud rate and the bit rate?

3.Drawthe signak diagram of NRZ and Manchester encodings for the bit strings 101110.

4.Please compare the three terms :unicast, multicast and broadcast.

5.Please compare the three terms :simplex, half-duplex, and full duplex and give an example for each of them.

6.How does a PC know the MAC address of another PC on the same network? Please give the name of the required protocol and briefly explain how it works.

7.Consider the two IP address,140.113.88.150 and 140.113.84.23 with the netmask 255.255.192.0. Are the network parts of their IP address the same ? Why ?

8.We say IP networks are unreliable because packets can be lost duplicated or impaired. What protocol is needed to provide a reliable transport service? How does this protocol know a packet is lost comes with errors?

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http://my.so-net.net.tw/dada1222/TEST.pdf