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Showing posts from February, 2009

Remote Procedure Call (RPC) - Session Layer protocol

Remote Procedure Call (RPC) is a protocol which works in session layer of OSI model and in the Application Layer of TCP/IP model. It is useful in developing network applications which need services from a remote computer in the network. With the help of Remote Procedure Call the programmer need not worry about the complex structure of OSI layer.


Working of Remote Procedure Call


1. RPC is working as a client server model

2. RPC uses different Authentication methods to validate the client request.

3. RPC protocol is independent of transport layer protocols.

4. RPC reuests can use both UDP and TCP but prefer UDP format


In RPC the client issues requests for certain services from server through the network.A client is a computer or process that accesses the services or resources of another process or computer on the network. A server is a computer that provides services and resources, and that implements network services.In short the requesting program is a client and the service-providing…

Network Layer - Functions and Main Protocols

Network Layer is the third layer in OSI Reference model. It is responsible for providing logical topology for a network by assigning IP addresses to every hosts. Providing logical addresses to networking devices is the duty of Network Layer. It also responds to service requests from Transport Layer and issues service requests to Data Link Layer. In network layer, data is passing in the form of packets.It is responsible for establishing paths for data transfer between different networks while Transport layer provides host to host communication. Router is the most important network layer device.



Functions of Network layer
Important functions of network layer are given below.
Network routing

Logical Addressing

Network segmentation and De-segmentation

Error handling
Network layer is responsible for assigning IP addresses and maintaining routing tables (Router does this function). Internet Protocol is responsible for assigning IP addresses to each and every networking devices in the networ…

Fiber Distributed Data Interface (FDDI) - Tutorial

Fiber Distributed Data Interface (FDDI) is a Local Area Network standard. Thought it is a LAN standard, theoretically it can span up to 200 kilometers. It is developed by the American National Standards Institute (ANSI). Fiber Distributed Data Interface is used as the high-speed backbone technology on ISPs because it supports high bandwidth. Communication through this standard is very secure due to its dual rings structure. Second token ring is for possible backup, in case of the failure of primary ring. If the second ring is also used to carry data, the total speed will increase up to 200 Mbps otherwise the speed is limited to 100Mbps. Now let us check the different versions of this data communication standard.

Different versions of FDDI FDDI-II

If you want to transmit video with voice over a network, we can use this standard. FDDI-2, supports the transmission of voice and video information as well as data. This version adds the capability to add circuit-switched service to the netwo…