Archive for October 7th, 2007
Router
- Without router, there’s no internet.
- They r specialized comps that let msg’s flow betn networks rather than within network along 1000’s of pathways.
- Each info pkt sent from comp is seen by all other comps on local network which chks if it was meant for its address. But as network size increases there will be performance issues as some people might send very big graphic files which use up most of networks capacity making network run slow. Then router has to direct traffic.
- Router connects ur comps to 1 another & when connected to modem/DSL/dial up, multiple comp’s can share 1 connection to internet.
- Internet data travels over pkg switching network where data is broken into pkgs of 1500bytes long, each with details of pkgs place in the entire msg, etc. If there is problem with 1pc of eqpt in network while msg being transferred, pkts r routed in diff way.
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Home network
- Allows 2 or more comps in ur home share files & docs, internet connection, printers, scanners etc devices.
- Wireless&Ethernet networks r most popular.
- Firewall protects ur network from offensive websites.
- Ethernet networks r faster than wireless & most secure. Diadvg is Ethernet bill, cables running around unless Ethernet cables installed in walls of new home.
- Other options to connect comps is, using cables, jumpdrives, file tranfer devices that can be connected to USB/FireWire ports for file transfer. Power & phone line networks use existing home wiring to connect comps.
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WiFi- wirless/802.11 networking
- Has lot of advgs- easy to set up, inexpensive.
- Uses radio waves.
- A computers wireless adapter translates data into radio signal, transmits it using antenna. Wireless router receives signal, decodes it, sends info to internet using physical, wired Ethernet connection. Process also works in reverse with router receiving info from net.
- Radios used for Wifi communication r very similar to walkie-talkies, cell phones etc but transmit at higher frequencies(allows signal to carry more data).
- Several devices can use 1router to connect to internet if they’ve wireless adapters.
- Interference or loss of connection occurs if router fails or too many people try to use high bandwidth appl’s same time.
- To start a wireless network at home, ur comp shd’ve built in wireless transmitter or buy a wireless adapter that plugs into PC card slot or USBport of laptop. For desktop, u can use USBadapters or buy adapter that fits into PCI slot inside comp’s case.
- USBwireless adapter, pc wireless card.
- Once u install wireless adapter & drivers that allow it to operate, ur comp discovers existing networks.
- Wireless router contains a port to connect to ur cable/DSLmodem, a router, an ethernet hub, a firewall, a wireless access point.
- Wireless router allows u to use wireless signals or Ethernet cables to connect ur comps to 1 another/printer/internet. Most of them cover 100ft from all directions.
- If router set to create an open hotspot, anyone who has wireless card will be able to use ur signal. Most people dont allow.
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