Computer Network-Introduction

The Computer network which is enables the user to share data and network resources. The Network allows remote users to communicate with each other.Computer networks are divided into LAN, CAN, MAN and WAN that depending on the coverage area.LAN is a small network and it is easy to create Client/Server configuration also called as two-tier architecture, it consist of two nodes, client and server.The OSI model consists of seven layers and it provides standards for computer communication. The Physical layer is responsible for actual transmission of bits over the medium.

Data Link layer is responsible for node to node delivery of frames. Network layer is responsible for end to end delivery of packets, and routing.Transport layer is responsible for end to end delivery of the entire message.Session layer is responsible for establishing, managing and terminating sessions.Presentation layer is responsible for translation, encryption and data compression.Application layer is responsible for providing access to the network

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