1.1 Chapter

1)Assume we add a new protocol to the application layer. What changes do we need to make to other layers?

2)During the weekend, Professor xyz often needs to access files stored on his office desktop from his home laptop. Last week, he installed a copy of the FTP server process on his desktop at his office and a copy of the FTP client process on his laptop at home. He was disappointed when he could not access his files during the weekend. What could have gone wrong?

3)Most of the operating systems installed on personal computers come with several client processes, but normally no server processes. Explain the reason.

4)Assume a TELNET client uses ASCII to represent characters, but the TELNET server uses EBCDIC to represent characters. How can the client log into the server when character representations are different?

5) Can you find an analogy in our daily life as to when we use two separate connections in communication similar to the control and data connections in FTP?

3.2 Chapter

1)List four types of delays in a packet-switch network.

2)Describe the three auxiliary protocols at the network layer of the TCP/IP suite that are designed to help the IPv4 protocol.

3)Describe the difference between multicasting and multiple-unicasting.

4)Explain why we can have different intradomain routing protocols in different ASs, but we need only one interdomain routing protocol in the whole internet.

4.1 Chapter

1)How does a single bit error differ from a burst error?

2)Explain why collision is an issue in random access protocols but not in controlled access or channelizing protocols.

3)How does a VLAN save a company time and money?

4)How does a VLAN reduce network traffic?

5)Discuss the functions of each SONET layer.

5.1 Chapter

1)Explain why the MAC protocol is more important in wireless LANs than in wired LANs.

2)What is multipath propagation? What is its effect on wireless networks?

3)An AP may connect a wireless network to a wired network. Does the AP need to have two MAC addresses in this case? Why or why not?

4)An AP in a wireless network plays the same role as a link-layer switch in a wired network. However, a link-layer switch has no MAC address, but an AP normally needs a MAC address. Explain the reason.

6.1 Chapter

1)We send a voice signal from a microphone to a recorder. Is this baseband or broadband transmission?

2)Describe PCM.

3)Which of the three multiplexing techniques are used to combine analog signals?

4)Name the two major categories of transmission media.

5)What are the three major classes of guided media?

6)What is the purpose of cladding in an optical fiber?