MCS-042 DATA COMMUNICATION AND COMPUTER NETWORKDS
M. C. A. (Revised) Term-End Examination June, 2019 MCS-042 : DATA COMMUNICATION AND COMPUTER NETWORKS 1. (a) How does 802.11 deal with the problem of a noisy channel ? Explain with an example. Ans. The wireless LAN is based on a cellular architecture where the system is subdivided into cells as shown in Figure1. Each cell (called basic service set or BSS, in the 802.11) is controlled by a base station (called access point or AP). Wireless LAN may be formed by a single cell, with a single access point (it can also work within an AP), most stations will be formed by several cells, where the APs are connected through some kind of backbone (called distribution system or DS). This backbone ...