Define packet switching and circuit switching. What is MANET?
Packet switching: In packet switched network, the message is divided into packets of fixed or variable size. In packet switching, there is no allocation for a packet and there is no scheduled processing time for each packet. Resources are allocated on demand. The allocation is done on a first-come, first-served basis. Packet switching is done at the network layer. There are two types of packet switching techniques: 1) datagram switching 2) virtual circuit switching.
Circuit switching: Circuit switching occurs at the physical layer. A circuit switched network consists of a set of switches connected by physical links. It consists of three phases:1) setup phase 2) data transfer phase 3) setup phase. The resources need to be reserved during the setup phase, the resources remain dedicated for the entire duration of data transfer until the teardown phase.
MANET is mobile adhoc network. It is an autonomous system of mobile stations connected by wireless links to form a network. Ad hoc networks are peer to peer where the data packets are transmitted from a source to a destination via intermediate nodes.
What do you mean by co-channel interference and system capacity?
Explain the concept of frequency reuse in cellular systems.
Discuss the three different mechanisms to improve the cell capacity and coverage area in a cellular system.
What are hidden station problem and exposed station problem in WLAN? How are the problems solved?
Draw the context diagram and level-1 diagram along with a data dictionary of an examination system for processing the marks of the students. The system after processing the marks of the students generates a report card for each individual student. The system also generates a consolidated report and sends it to the Controller of examination. Also draw the use case diagram of the above mentioned scenario.