COMPUTER NETWORKS & DATA COMMUNICATIONS  ce-413

 

 

ASSIGNMENT # 1

 

 

DUE DATE: 5th ,February 2009

 

 

Question 1: Name the seven layers of the OSI Reference Model. Why did the creators of the OSI Reference Model decide to have seven layers? Can you propose a better reference model for computer networks? Name four other models that have been proposed for the same purpose other than the OSI reference model.

 

Question 2: What are the origins of the DOD model for computer communications and networks? Is it better than the OSI Reference Model?

 

Question 3: Is the network layer implemented in hardware or software and why is it done that way?

 

Question 4: Compare and contrast between the transport layer and the datalink layer.

 

Question 5: What is the difference between a router and a gateway?

 

Question 6: Name the highest layer on which each one of the following entities operates:

  1. Four Port Token Ring Bridge

  2. Modem

  3. FTP Server

  4. FTP Client

  5. Netmeeting Software

  6. Network Interface Card

  7. Router

  8. Internet Explorer

  9. Ethernet Switch

  10. Ethernet Hub

 

Question 7: What is a PDU? Give examples with figures of two real world PDUs.