Data Comm

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DATA COMMUNICATION ASSIGNMENT 2 CLASSIFICATION ON WIRELESS NETWORKS Size -WLANS: Wireless Local Area Networks: WLANS allow users in a local area, such as a university campus or library, to form a network or gain access to the internet. A temporary network can be formed by a small number of users without the need of an access point; given that they do not need access to network resources. -WPANS: Wireless Personal Area Networks: The two current technologies for wireless personal area networks are Infra Red (IR) and Bluetooth (IEEE 802.15). These will allow the connectivity of personal devices within an area of about 30 feet. However, IR requires a direct line of site and the range is less. -WMANS: Wireless Metropolitan Area Networks:…show more content…
A signal from the source travels in both directions to all nodes connected to bus cable until it finds the address on the network that is intended. Advantages * Economical to run * Requires less cable * Does not require extensive training * Good choice for small networks Disadvantages * Difficult to isolate malfunctions because of a series of connections * When one fails all devices might fail * Heavy traffic causes network to slow down Star topology Each network host is connected to a central hub via a point to point connection. All traffic has to pass through central hub which acts as a signal booster. Advantages * Easy to install and upgrade * Easy to maintain compared to bus and ring topologies * Central hub makes troubleshooting easy Disadvantages * Central hub failure causes entire network to go down * Its more expensive when cabling SWITCHING TECHNIQUES Circuit switching Circuit switching is defined as a mechanism applied in telecommunications (mainly in PSTN) whereby the user is allocated the full use of the communication channel for the duration of the call. That is if two parties wish to communicate, the calling party has to first dial the numbers of the called party. Once those numbers are dialed, the originating exchange will find a path to the terminating exchange, which
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