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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
1st meeting
2nd meeting
3rd 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, 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
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 Email.
• 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
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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!
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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”
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: 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
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!
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Verify IP Configuration: Win XP, NT, 2000
• ipconfig
• ipconfig /all
1
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
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