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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

1st meeting

2nd meeting

3rd meeting

Chapter 1 – Introduction to Networking

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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.

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The role of an IT (Information Technology) Professional

• Networks are no longer a luxury, but a requirement to keep the organization running.

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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, email, and access to servers– Troubleshooting– Helping users

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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

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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 Email.

• Keep the computers secure from viruses and hackers.

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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

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Most successful networking applications?

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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.

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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!

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Requirements for Internet connection

• Physical connection from a computer (PC) to a network– Telephone Modem (Analog) – Network Interface Card (NIC)

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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”

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Requirements for Internet connection

• Applications that interprets the data and displays the information in an understandable form:– Web browser – File Transfer Protocol (FTP)

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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.

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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

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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.

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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: 802.11a, b, or g

• Types of media – Twisted-pair, coaxial (older technology), wireless, or fiber-optic

• More LATER!

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• 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

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Overview of high-speed and dial-up connectivity

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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.

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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!

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Verify IP Configuration: Win XP, NT, 2000

• ipconfig

• ipconfig /all

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2

3

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Verify IP Configuration: Win 9x

1 2

3 4

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TCP/IP description and configuration

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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 192.168.10.30

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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.

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Verify IP Configuration: Linux/Unix

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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