Nalanda Open University
Annual Examination 2016
Bachelor in Computer Application Part-III
Paper-XV [Computer Networks
Time: 3.00 Hrs. Full Marks: 80
Answer any Five questions. All questions carry equal marks.
1. Compare and contrast between OSI model and TCP/IP model.
2. What are the devices used at datalink layer? Describe the functions of
network layer.
3. Differentiate between broadband and baseband services. Write the
protocols used at data link layer and network layer.
4. Explain the different types of transmission media with examples.
5. Which layer is responsible for congestion control and routing? How
congestion can be controlled? Explain.
6. What are the functions of transport layer? Describe the protocols used at
transport layer.
7. What is network security? Explain the methods used to make the network
secure.
8. What is ISDN Describe ISDN BRI Services? Also discuss the advantages
of using ISDN.
9. Differentiate between virtual circuit and datagrams. Explain the terms
Bandwidth, Channel capacity, Multiplexing, Quality of Service Full-
Duplex Transmission
10. Describe all the fields of TCP header with diagram.