Computer Networks (IT-502) - Important Questions

Describe the TCP/IP reference model and compare/differentiate it with the ISO-OSI model.

Define PAN, LAN, WAN (and internetwork) and compare them in terms of coverage area, speed and applications.

Explain the ISO-OSI reference model and describe the functions of each of the seven layers.

Explain flow control and error control mechanisms in the Data Link Layer.

Explain the working of the CSMA protocol and what a station should do when the channel is busy or idle.

Describe the Stop-and-Wait protocol in detail. Explain its working with a suitable diagram.

Two neighboring nodes (A and B) use a sliding-window protocol with a 3-bit sequence number. As the ARQ mechanism, Go-Back-N is used with a window size of 4. Assuming A is transmitting and B is receiving, show the window positions for sender and receiver.

Explain the IPv4 header / datagram format and the importance of each field.

One of the addresses in a block is 167.199.170.82/27. Find the number of addresses in the network, the first address, and the last address.

State major differences between Distance Vector Routing and Link State Routing and discuss how they work.

Define Transmission Control Protocol (TCP) and explain the TCP header format.

Explain the concept of Quality of Service (QoS) in the transport layer.

Compare open-loop congestion control and closed-loop congestion control.

Explain Simple Mail Transfer Protocol (SMTP) / ESMTP and message transfer using it.

Explain Simple Network Management Protocol (SNMP) and discuss its components.

Explain DNS in the Internet. How does a DNS resolver bootstrap the domain name lookup process? Explain iterative vs recursive resolution with example.