Question 1: (10 Marks)
Which of the layer(s) of the OSI model perform(s) the following functions?
Assignment No. 01
(Non Graded)
Semester: Fall 2013
CS601-Data Communication
Total Marks: 20
Due Date: 26/11/2013
Sr. No. Functions OSI Layer(s)
1 Route determination
2 Reliable process to process delivery
3 Provides user services such as email and file transfer
4 Error correction and retransmission
5 Establishes, manages and terminates session
6 Defines frames
7 Transmission of bits across medium
8 Format and code conversion services
9 Ensures reliable transmission of data
10 Communicates directly with user’s application program
Question 2: (10 Marks)
Discuss the consequences if a connection fails in each of the following five network topologies having four devices.
1. Devices arranged in a mesh topology
2. Devices arranged in a star topology (not including the hub)
3. Devices arranged in a bus topology
4. Devices arranged in a ring topology
5. Devices arranged in a dual ring topology
NOTE: Every student should provide his/her own work, exact copying of the assignment (or some portion of the assignment) from the internet or other students will lead to copy case and zero marks will be awarded. Do not put any query on MDB about this assignment, if you have any query then email at cs601@vu.edu.pk.
