1 Syllabus at a glance – CMCN 6103 Introduction Introduction to Networking Network Fundamentals Number Systems Ethernet IP Addressing Subnetting ARP DNS TCP and UDP ICMP Routing Security 1 st meeting 2 nd meeting 3 rd meeting

Chapter 1 – Introduction to Networking

3 Outcomes 1. What is networking? 2. Understand the physical connection that has to take place for a computer to connect to networks and the Internet. 3. Recognize the basic components that comprise the computer. 4. Install understand network interface cards and/or modems. 5. Use basic testing procedures to test the Internet connection. 6. Demonstrate a basic understanding of the use of web browsers.

4 The role of an IT (Information Technology) Professional Networks are no longer a luxury, but a requirement to keep the organization running.

5 Computer Technician “Desktop” support –Responsible for setting up and maintaining the users’ computers. –Putting the computers together. –Adding new hardware: RAM, CD-ROM drive, Monitor, etc. –Installing software –Setting up accounts, , and access to servers –Troubleshooting –Helping users

6 Network Technician Connecting the computers to the network. Install, manage, troubleshoot network infrastructure: –Routers, Switches, Cables, Wireless Access Points Issues: –Security –Quality of Service –Video On Demand –IP Telephony or Voice over IP Setting up any wireless network access. Configure the routers and switches. –Basic configurations –Security –Traffic flow

7 System Administrator Maintaining the “file servers”, the computers that store the software and data used by everyone. Setting up usernames and passwords for controlling access to the network. Setting up and maintaining the servers that control . Keep the computers secure from viruses and hackers.

8 What is networking? Communication! An interconnection of computers and other devices: –Printers –Servers (computers) –Scanners –Network Devices Hubs Switches Routers Firewall Modem Wired and Wireless

9 Most successful networking applications?

10 Outcomes 1. What is networking? 2. Understand the physical connection that has to take place for a computer to connect to networks and the Internet. 3. Recognize the basic components that comprise the computer. 4. Install understand network interface cards and/or modems. 5. Use basic testing procedures to test the Internet connection. 6. Demonstrate a basic understanding of the use of web browsers.

11 Requirements for Internet or Network connection Note: The Internet is a “network of networks”. We will make this distinction clearer as we go. The requirements for an Internet connection are normally the same for connecting to other types of networks including LANs (Local Area Networks). More LATER!

12 Requirements for Internet connection Physical connection from a computer (PC) to a network –Telephone Modem (Analog) –Network Interface Card (NIC)

13 Requirements for Internet connection Logical connection uses standards called protocols (rules for how information is transmitted): (More LATER!) –Ethernet –TCP/IP, a “suite of protocols”

14 Requirements for Internet connection Applications that interprets the data and displays the information in an understandable form: –Web browser –File Transfer Protocol (FTP)

15 Outcomes 1. What is networking? 2. Understand the physical connection that has to take place for a computer to connect to networks and the Internet. 3. Recognize the basic components that comprise the computer. 4. Install understand network interface cards and/or modems. 5. Use basic testing procedures to test the Internet connection. 6. Demonstrate a basic understanding of the use of web browsers.

16 PC basics Personal Computer Subsystems Printed circuit board (PCB) CD-ROM drive Central processing unit (CPU) Floppy disk drive Hard disk drive Microprocessor Motherboard Bus Random-access memory (RAM) Read-only memory (ROM) System unit Expansion slot Power supply Network interface card (NIC) Video card Audio card Parallel port Serial port Mouse port Power cord

17 Outcomes 1. What is networking? 2. Understand the physical connection that has to take place for a computer to connect to networks and the Internet. 3. Recognize the basic components that comprise the computer. 4. Install understand network interface cards and/or modems. 5. Use basic testing procedures to test the Internet connection. 6. Demonstrate a basic understanding of the use of web browsers.

18 Network interface cards (NIC) A NIC is used to connect a device (computer) to a LAN (Local Area Network). The LAN is usually connected to a ISP (Internet Service Provider) When selecting a NIC, consider the following factors: Protocols – Ethernet, Token Ring (becoming obsolete), wireless protocols: a, b, or g Types of media – Twisted-pair, coaxial (older technology), wireless, or fiber-optic More LATER!

19 A modem, or modulator-demodulator, is a device that provides the computer with connectivity to a telephone line. Converts signals from analog to digital, and digital to analog. Depending upon your “Internet connection”, you may have just a NIC, just a modem or both. NIC and modem installation

20 Overview of high-speed and dial-up connectivity

21 Outcomes 1. What is networking? 2. Understand the physical connection that has to take place for a computer to connect to networks and the Internet. 3. Recognize the basic components that comprise the computer. 4. Install understand network interface cards and/or modems. 5. Use basic testing procedures to test the Internet connection. 6. Demonstrate a basic understanding of the use of web browsers.

22 TCP/IP description and configuration Transmission Control Protocol/Internet Protocol (TCP/IP) is a set of protocols or rules developed to allow cooperating computers to share resources across a network. Includes a “unique” (well, not always) address assigned to your computer Much more LATER!

23 Verify IP Configuration: Win XP, NT, 2000 ipconfig ipconfig /all 1 2 3

24 Verify IP Configuration: Win 9x

25 TCP/IP description and configuration

26 Verify IP Configuration: MAC OS From the Apple menu, open your Control Panel, and select the TCP/IP option. (older MacOS versions use the MacTCP control panel.) Click on the "Info" button in the TCP/IP configuration dialog. The configuration dialog shown to the right will be displayed. Look at the address listed next to the line "This Macintosh" In this example, the IP address is

27 Verify IP Configuration: MAC OS X Select the Apple Menu, choose the System Preferences option, and the Network control panel. Select the TCP/IP tab.

28 Verify IP Configuration: Linux/Unix

29 Testing connectivity with ping The ping command works by sending multiple IP packets to a specified destination. Each packet sent is a request for a reply. The ping command is used to test the NIC transmit/receive function, the TCP/IP configuration, and network connectivity.

Chapter 1 – The End