1. Introduction to Network Basic 1

2. Agenda – - Internetworking Basic – - OSI Layer – - TCP/IP Model – - IP Addressing – - Subnetting & VLSM – - The Internal Components of a Cisco Router – - The Router Boot Sequence – - IOS User Interface & CLI – - Managing Configuration Register – - Router & Switch Administrative Configuration – - Viewing, Saving, and Erasing Configurations – - Backing Up and Restoring the Cisco IOS – - Backing Up and Restoring the Cisco Configuration – - Checking Network Connectivity and Troubleshooting 2

3. What Is a Network? A network is a connected collection of devices that can communicate with each other. Networks carry data in many kinds of environments, including homes, small businesses, and large enterprises.

4. Common Physical Components of a Network There are four major categories of physical components in a computer network: the computer, interconnections, switches, and routers.

5. Network History ARPA :- Advanced Research Project Agency

6. Network History continued

7. Networking Devices Networks are depicted graphically using a set of standard icons

8. - The major resources that are shared in a computer network include data and applications, peripherals, storage devices, and backup devices. - The most common network user applications include e-mail, web browsers, instant messaging and databases. - User applications affect the network by consuming network resources. - The ways in which networks can be described include characteristics that address network performance and structure: speed, cost, security, availability, scalability, reliability, and topology. - A physical topology describes the layout for wiring the physical devices, while a logical topology describes how information flows through a network.

9. Bus Topology – All devices receive the signal. In a physical bus topology, a single cable effectively connects all the devices.

10. Star Topology –In a physical star topology, each device in the network is connected to the central device with its own cable. – Transmission through a central point. – Single point of failure.

11. Extended-Star Topology – When a star network is expanded to include additional networking devices that are connected to the main networking device, it is called an extended-star topology.

12. Ring Topology – In a ring topology, all the hosts are connected in the form of a ring or circle. – Single point of failure.

13. Dual-Ring Topology –In a dual-ring topology, there are two rings to provide redundancy in the network. – Signals travel in opposite directions. – More resilient than single ring.

14. Full-Mesh Topology – A full-mesh topology connects all devices to each other; – Highly fault-tolerant – Expensive to implement

15. Partial-Mesh Topology – Partial-mesh topology, at least one device has multiple connections to all other devices. – Trade-off between fault tolerance and cost

16. Local-area Networks (LANs)

17. Local Area Network

18. LAN Components –Computers PCs Servers –Interconnections NICs Media –Network devices Hubs Switches Routers –Protocols Ethernet IP ARP DHCP

19. Functions of a LAN – Data and applications – Share resources – Provide communication path to other networks

20. LAN Standards

21. Wide-area Networks (WANs)

22. Wide-Area Network

23. WANs vs. LANs

24. WAN Access and the OSI Reference Model

25. WAN Devices  Routers  Terminal servers  Modems  DSU/CSU  WAN networking devices –ATM switches –Frame Relay switches –PSTN

26. Physical Layer: WANs

27. Serial Point-to-Point Connections

28. WAN—Multiple LANs

29. WAN Data-Link Protocols – HDLC – PPP – Frame Relay (LAPF) – ATM

30. WAN Link Options

31. Metropolitan-Area Network (MANs)