Download to read offline
Uploaded byHNDE Labuduwa Galle
Lecture 02 networking
The document discusses the OSI reference model, which breaks network communication into 7 layers, with each layer performing a unique task and only interacting with adjacent layers. It also compares the OSI model to the TCP/IP model. The key difference is that TCP/IP combines the functions of the OSI data link and physical layers. The document further explains the Internet Protocol (IP) which specifies packet formatting and addressing for data transmission. It distinguishes between IPv4 and IPv6, noting IPv6 uses a 128-bit addressing scheme and provides improvements over IPv4 such as no NAT.
More Related Content
Similar to Lecture 02 networking
Lecture 02 networking
- 1. Information Technology III Lecture 02- Reference Model of OSI
- 2. Open SystemsInterconnection (OSI) Each layer support the layers above it and offers services to the layers below Each layer performs unique and specific task A layer only has knowledge of its neighbour layers only A layer service is independent of the implementation Introduction to the OSI layer
- 3. Why layered model? It breaks network communication into smaller, simpler parts It standardizes network components to allow multiple-vendor development and support It allows different types of network hardware and software to communicate with each other It prevents changes in one layer from affecting the other layers, so that they can develop more quickly It breaks network communication into smaller parts to make learning it easier to understand
- 4. Protocol Reference Modelof OSI
- 6. Protocol Reference Modelof OSI
- 7. Difference between TCPand UDP TCP UDP Reliability: TCP is connection-oriented protocol. When a file or message send it will get delivered unless connections fails. If connection lost, the server will request the lost part. There is no corruption while transferring a message. Reliability: UDP is connectionless protocol. When you a send a data or message, you don't know if it'll get there, it could get lost on the way. There may be corruption while transferring a message. Ordered: data arriving in the sending order. Ordered: no ordered Heavyweight: - tracking of connection Lightweight: No ordering of messages, no tracking connections, etc. Streaming: Data is read as a "stream," There may be multiple packets per read call. Datagrams: Packets are sent. One packet per one read call. Examples: World Wide Web e-mail File Transfer Protocol Examples: Domain Name System streaming media applications such as IPTV or movies, Voice over IP (VoIP) Trivial File Transfer Protocol (TFTP) online multiplayer games
- 8. Comparison with TCP/IP •presentation and session layers are not there in TCP/IP model • The Network Access Layer in TCP/IP model combines the functions of Datalink Layer and Physical Layer • TCP/IP provides end-to-end connectivity specifying how data should be packetized, addressed, transmitted, routed and received at the destination
- 9. What is InternetProtocol (IP)? IP ( Internet Protocol) specifies the technical format of packets the addressing scheme for computers It combined with a higher-level protocol called Transmission Control Protocol (TCP), which establishes a virtual connection between a destination and a source IPV4 - Internet protocol used to connect devices to the Internet. IPv4 uses a 32-bit address scheme IPV6 - IPv6 (Internet Protocol Version 6) called IPng (Internet Protocol next generation) IPV6 IS 128-bit IP address
- 10. Technologies in IPV6 No more NAT (Network Address Translation) Auto-configuration No more private address collisions Better multicast routing Simpler header format Simplified, more efficient routing True quality of service (QoS), also called "flow labeling" Built-in authentication and privacy support Flexible options and extensions Easier administration