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Network Fundamentals–Chapter 5

OSI Network Layer. Learning Objectives; Upon completion of this chapter, you will be able to: Identify the role of the Network layer as it describes communication from one end device to another end device. Examine the most common Network layer protocol, Internet Protocol (IP), and its features for providing connectionless and best-effort service. Understand the principles used to guide the division, or grouping, of devices into networks. Understand the hierarchical addressing of devices and how this allows communication between networks | 111 a 111 a CISCO OSI Network Layer Network Fundamentals - Chapter 5 ITE I Chapter 6 2006 Cisco Systems Inc. All rights reserved. Cisco Public 1 Objectives Learning Objectives Upon completion of this chapter you will be able to - Identify the role of the Network layer as it describes communication from one end device to another end device. - Examine the most common Network layer protocol Internet Protocol IP and its features for providing connectionless and best-effort service. The Netvrart Layer As we communicate our data Our devices use lhe Transport layer to connect processes. And the Network layer enables devices to reach each other Network Data Link Physical Applicator Presentation Session I Transport I Routers connected to each other - Understand the principles used to guide the division or grouping of devices into networks. - Understand the hierarchical addressing of devices and how this allows communication between networks. - Understand the fundamentals of routes next-hop addresses and packet forwarding to a destination network. ITE 1 Chapter 6 2006 Cisco Systems Inc. All rights reserved. Cisco Public 2 Network Layer - Communication from Host to Host The Network layer or OSI Layer 3 provides services to exchange the individual pieces of data over the network between identified end devices. -Unlike the Transport layer OSI Layer 4 which manages the data transport between the processes running on each end host Network layer protocols specify the packet structure and processing used to carry the data from one host to another host. Operating without regard to the application data carried in each packet allows the Network layer to carry packets for multiple types of communications between multiple hosts. Network layer protocols forward encapsulated Tran sport Layer POUs between hosts 192.168.32.11 --------- Addressing L Host 7 Application Data Data 6. Presentation Datai Encapsulation 15. Session Data I 4. Transport Segment 3. Network mÍể it Physical .