An introduction to Networking Chapter 1 Updated January 2007 Panos a Business data Networks and Te/ecommunications. 6th edition Copyright 2007 Prentice-Hall May only be used by adopters of the book
An Introduction to Networking Chapter 1 Updated January 2007 Panko’s Business Data Networks and Telecommunications, 6th edition Copyright 2007 Prentice-Hall May only be used by adopters of the book
Builds Slides with the mouse click icon in the upper right hand corner are buildslides Not everything on the slide will appear at once Each time the mouse click icon is clicked. more information on the slide will appear
2 Builds • Slides with the “mouse click” icon in the upper right hand corner are “build” slides • Not everything on the slide will appear at once • Each time the mouse click icon is clicked, more information on the slide will appear
Part l: Basic networks Concepts eoo Concepts we will see eo throughout the book
Part I: Basic Networks Concepts Concepts we will see throughout the book
Figure 1-1: Basic Networking Concepts · What is a network? a network is a transmission system that connects two or more applications running on different computers Network
4 Figure 1-1: Basic Networking Concepts • What Is a Network? – A network is a transmission system that connects two or more applications running on different computers. Network
Figure 1-1: Basic Networking Concepts Client/Server Applications Most Internet applications are client/server applications Clients receive service from servers The client is often a browser C lient Server Program Program Services Client Computer Server Computer 5
5 Figure 1-1: Basic Networking Concepts • Client/Server Applications – Most Internet applications are client/server applications – Clients receive service from servers – The client is often a browser Client Computer Server Computer Server Program Client Program Services
Part l: the nine elements of a Network Although the idea of network is simple, you must understand the nine elements found in most networks
Part II: The Nine Elements of a Network Although the idea of “network” is simple, you must understand the nine elements found in most networks
Figure 1-3: Elements of a Network Client Application Server Application Message(Frame) Access Switch Client Networks connect Server Computer applications on different computers Computer SWItC Switch Networks connect computers 2. Clients(fixed and mobile) and Mobile 3. Servers Client Outside World Wireless Access point Router
7 Figure 1-3: Elements of a Network Wireless Access Point Mobile Client Router Outside World Server Computer Client Computer Switch 1 Switch 2 Switch 3 Message (Frame) Access Line Trunk Line Client Application Server Application 1. Networks connect applications on different computers. Networks connect computers: 2. Clients (fixed and mobile) and 3. Servers
Figure 1-3: Elements of a Network Client application Server Application Message(Frame) Client Server Computer Computer Switch Computers(and routers) 3 usually communicate Mol by sending messages Cli called frames Outside World Wireless Access point Router 8
8 Figure 1-3: Elements of a Network Wireless Access Point Mobile Client Router Outside World Server Computer Client Computer Switch 1 Switch 3 Message (Frame) Trunk Line Client Application Server Application 4. Computers (and routers) usually communicate by sending messages called frames
Figure 1-3: Elements of a Network Client Application Server Application Client Sends Sw1 Sends Maasage( Sw2 Sends Frame Frame Frame To SW3 to Sw1 to sw2 Client Switch 2 Computer Sw3 Sends Frame to ter Switch 1 Server Trunk Switch 3 ine. Switches forward Switch Outside Frames Sequentially World Access point Router
9 Figure 1-3: Elements of a Network Wireless Access Point Mobile Client Router Outside World Server Computer Client Computer Switch 4 Message (Frame) Trunk Line Client Application Server Application Switch 2 Switch 1 Switch 3 Client Sends Frame to Sw1 Sw1 Sends Frame to Sw2 Sw2 Sends Frame To Sw3 Sw3 Sends Frame to Server 5. Switches Forward Frames Sequentially
Figure 1-5: Ethernet Switch Operation C3-is out Port 15 D4-47-55-C4B6-F9 Switching Table Port Host Switch 10 A1-44-D5-1F-A 13 B2-CD-13-5B- 2 1532D-5538A94F 16 D4-47-55-C4-B6-F9 Port 15 3 Frame to c3 Frame to c3 A1-44-D5-1F-AA-4C B2-CD-13-5B-E4-65 C3-2D-55-3B-A94F A1-sends a frame to c3 Switch sends frame to c3- 10
10 Figure 1-5: Ethernet Switch Operation A1-44-D5-1F-AA-4C B2-CD-13-5B-E4-65 Switch D4-47-55-C4-B6-F9 C3-2D-55-3B-A9-4F Port 15 Frame to C3… A1- sends a frame to C3- Frame to C3… Switch sends frame to C3- Switching Table Port Host 10 A1-44-D5-1F-AA-4C 13 B2-CD-13-5B-E4-65 15 C3-2D-55-3B-A9-4F 16 D4-47-55-C4-B6-F9 15 C3-2D-55-3B-A9-4F C3- is out Port 15 1 2 3
