Wireless LAN is one of the fastest growing technologies in the communication field. It works based on the Wi-Fi standard and provides uninterrupted wireless internet access to mobile workers. Since there is no limitation of wires, WLAN networks are implemented in home, schools, colleges, business enterprises etc.
SECURITY THREATS for WLAN ENVIRONMENT
Even though it is very effective and useful, there is a major disadvantage of security threats. Here an intruder doesn’t need a physical connection for the unauthorized access The threats can be of different types Continue reading
Concrete is a so familiar material to everyone and we cannot think a sustainable building without using concrete. Concrete is a mixture of cement, water and coarse and fine aggregates. Its rigidity and durability make it most important material for any construction. It is a fact that concrete causes some ecological problems also. Numerous studies are going on about the side effects of concretes and as a result of these studies a concept of eco-friendly concrete is emerged. This is known as green concrete.
A green concrete has nothing to do with the color. ‘Green’ means it is eco-friendly. It considers all aspects, from raw material manufacture to construction and service life, to make a resource saving concrete structures. Continue reading
Sharing of load always give some breathing space. This is a simple logic that we all know. In the case of computers also we use this strategy. A large task is divided to a group of computers and their combined action will decrease the effort and increase efficiency. This is known as parallel computing, a high-performance computing technique. It is a group of processing elements that corporate and communicates each other for solving a common problem. They are also called Distributed Shared Memory (DSM) machines and are varied in two types, based on their architecture. Continue reading
Ad hoc is a Latin word with a meaning ‘for this purpose’. As its name, it is a short life, self-configuring, infrastructureless mobile device network, with a wireless connection. Routing of Mobile Ad hoc NETworks (MANETs) are always a challenging task, because each mobile device should be provided with some algorithms which make them to take decisions about the routing of data traffic. Such networks operate themselves or may be connected to internet. 1990’s onwards, ad hoc networks are a hot field of research. The reason may be that, at that time the small portable wireless networking devises are began to question the monopoly of wired, heavy analog devices. The evolution of efficient wireless networks causes the invention of numerous protocols which make the networking task more secure and may be easier than using a wired one. Advancements in protocols make the user able to move from just one or two feet to hundreds of meters with in a bounded area. Continue reading
RTP is a standardization for packet data traffic for delivering video and audio over IP networks. The Audio-Video Transport Working Group of the Internet Engineering Task Force (IETF) developed the RTP and published in 1990. It provides an end to end transportation function for applications transmitting real time data over unicast or multicast network. The entertainment systems, dealing with steaming media and various communication systems use RTP extensively. RTP is always used in combination with RTCP (RTP Control Protocol). RTP and RCTP are designed to work independently of the transport and the network layer underlying to it. RTP transports the multimedia data and the RCTP continuously monitor and transmits control signals. It is used with an associated profile format for multimedia transmission in IP networks and it is considered as a primary standard for this purpose. Continue reading