basic concepts of Networks ,classification of networks, WIFI, downloading and uploading

1. Network Concepts and Wi-Fi
Deepak John, Assistant Lecturer
Department of Computing, LYIT

2. Topics to be covered
 Introduction To Network Concepts
 Wi-fi And Secure Wi –Fi Setup
 Downloading And Uploading
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3. Network Concepts
 Network is a group of computers and associated devices that are
connected by communication facilities.
 Need for Networking
1. Resource Sharing
2. Reliability
3. Reduced Cost
4. Fast Communication
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4.  Common Networking Terms
• Server — shares resources across network, typically with more central
processing unit (CPU) power and storage capacity than other computers
• Client — accesses shared resources.
• Request-response — client requests information; server responds by providing
information.
• Client-server relationship — client makes a request to the server, and the server
responds with requested data.
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5.  Types of Networks
i. Local Area Network - LAN
ii. Metropolitan Area Network – MAN
iii.Wide Area Network – WAN
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6.  Local Area Network
✓ It is generally limited to a small area such as a lab, school, or building.
✓ In a typical LAN configuration, one computer is designated as the server.
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7.  Metropolitan area network (MAN)
✓ Spans distances measured in miles.
✓ links two or more separate LANS.
✓ E.g. Cable T.V. networks
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8.  WAN
✓ Wide Area Networks (WANs)
connect larger geographic areas,
✓ Dedicated cabling or satellite uplinks
may be used to connect this type of
network.
✓ Largest WAN is Internet.
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9.  Wireless LANs
✓ use high frequency radio signals, infrared light beams, or lasers to
communicate between the resources.
✓ Each resource on a wireless network has some sort of transceiver/antenna
to send and receive the data.
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10.  Network Types (Based on Connection)
1. Peer to Peer
• No centralized control
• Act as both client & server.
• User controls access to machine.
• security concerns
• Adding machines slows network down
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11.  Advantages
• Easy to install & configure.
• Users control individual shared
resources.
• Inexpensive to purchase & operate.
• No Network Administrator
• Best for 10 or fewer users
 Disadvantages
• Individual machine backups
• Speed decreases while sharing
• No central location/access of data
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12. 2. Client Server
• Server is the key to this type.
• Centralized control of resources
• Utilize faster processors.
• More memory and Extra peripherals
• Account names,Passwords
• Firewalls
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13.  Advantages
• Simplify network administration.
• Powerful/ efficient access to resources
• Disadvantages
• Server failure results in unusable network and loss of resources
• Expert staff ,Dedicated hardware and software increases cost.
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14. WiFi
 Wi-Fi, a wireless network
allows you to connect laptops,
smartphones, and other mobile
devices to your home Internet
service without an Ethernet
cable.
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15. How to set up Wi Fi
1. Purchase a wireless router: wireless router is the device that will
broadcast the Wi-Fi signal from your Internet modem throughout your
house.
2. Connect the cables: Ethernet cable from modem and Power cable
3. Configure your router : Configure default settings
4. Connect
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16. How to find the IP address of your router using Windows
1. Right-click the Windows icon in the bottom-left of your screen, and select
"Command Prompt.“ or type “cmd” and press Enter button on windows
search bar
2. In the Command Prompt window, type "IPCONFIG" and press Enter.
3. Find the "Default Gateway" section. The number listed here is your
router's IP address.
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17. How to find the IP address of your router using a Mac
1. Click the Apple icon at the top-left of the screen and choose "System
Preferences.“
2. Click "Network.“
3. In the list on the left side of the window, choose your network and then
click "Advanced" at the bottom-right of the window.
4. Finally, click "TCP/IP." You should see the router's IP address, listed next
to "Router."
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18. How to Secure Wi-Fi
1. Rename Routers and Networks
2. Use Strong Passwords
3. Keep Everything Updated
4. Turn On Encryption
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19. Downloading and Uploading
➢ Downloading means receiving data or
a file from the Internet on your
computer.
➢ Uploading means sending data or a
file from your computer to somewhere
on the Internet.
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20.  Internet Download usually involves
1. Starting an internet browser
2. Selecting the information you want to download
3. Download the file
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21.  Tips for safe downloading
i. download from sites you trust and to never download file
attachments to emails that you are not completely sure are safe.
ii. The most dangerous files to download are executable files that sport
an .exe extension at the end of the filename. Clicking on these will
run a program of some kind and could therefore pose an active
threat.
iii. Always use up to dated antivirus software's
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22.  Open and view A downloaded file
✓ depends on the type of file it is. Look at the file's extension (the 3-
character file ending after the period).
✓ double-click on the downloaded file . If the file's extension is
recognized as a file type associated with an application installed on
your computer, the application will load, and the file will open.
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23. Download Manager
 download managers make the process of downloading from the
internet not just simpler and easier, but instead offer better
management options which can include faster downloads.
 This can include setting up priorities, download scheduling,
BitTorrent support, batch downloading, a range of security features,
file previewing, and support for compressed file formats
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24.  Free download managers
1. Download Accelerator Plus: Media file previews, Impressive speed
2. Ninja Download Manager :Super fast downloads, Media previews ,mid-download
,Download scheduling.
3. Free Download Manager: Bandwidth monitoring, One-click torrenting ,Web-based
remote control.
4. Jdownloader: Completes CAPTCHAs automatically ,Web-based remote control,
Installer contains adware.
5. EagleGet: Compatible with all browsers Malware checker, Bundled extra software
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25. Thank you
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