Objective: i. To learn about Network Architecture ii. To introduce the concepts of OSI and the service primitives iii. To introduce a simple client and server interaction on a connection oriented network Network: A network is an interconnection of a set of devices capable of communicating using well defined set of rules called protocol. Network allows us to share message,  in the form of text, numbers, pictures/images, audio and video, among networked devices Network Architecture: A set of layers and protocols is called a network architecture.The specification of an architecture must contain enough information to allow an implementer to write a program or build for each layer so that it will correctly obey the appropriate protocol. Reference Model ISO-OSI: Open System Interconnect Historically, communication between devices of single