Networks

Networks

LAN
1. used for a specific companies or area
WAN
1. used for world wide
Topology
1. Bus
  1. all devices connected to one cable (terminator)
  2. the terminators are attached to each end
  3. cheap, easy to install
  4. no extra equipment needed
  5. high chance of collision (more comp means more)
  6. catastrophic failure damages wires
2. Ring
  1. connected with two other comps to form ring formation
  2. passes data in a direction until reaches intended recipement
  3. no collision
  4. no. of comps does not affect speed
  5. one faulty cable or faulty comp will result catstrophic failure
  6. more difficult to add comps
3. Star
  1. all comps are connected to hub or switch making a star formation
  2. hub sends each message to all comps
  3. switch checks address and send it to only rhe right comps
  4. no collision and easy to add comps
  5. failure of cable does not affect
  6. expensive
  7. failure of hub/switch is catastrophic and expensive/difficult to fix
4. Mesh
  1. circuit swithing
    1. path across net is established
    2. path is locked , remains open during communication
    3. data arrives in order
    4. data arrives at constant speed
    5. clogs the network with constant one way
    6. blocks other data
  2. packet switching
    1. packets are re-assembled at the other siade
    2. data are split to small packets, sent independantly using different paths
    3. don't clog
    4. multiple transmissions can happen simultaneously
    5. lag needed
    6. doesn't arrive in order
  3. pathfinding
    1. can be used for weighted graphs
    2. needs to run once and finds the shortest path
    3. finds shortest route between two points
    4. usually used ofr heavy weight graphs
    5. can't be used for negative graphs
    6. time consuming becuase it flows to every direction
  4. full = all comps coneected each other
  5. partial = some are connected
  6. mulitle transmission at the time
  7. zero catastophics
  8. redundacy
  9. expensive
wired
1. connected with physical wires
2. used to transmit data
wireless
1. radio waves are used to transmit data
2. no physical connection needed
protocols
1. HTTP / HTTPS
  1. standard protocol used for requesting an HTML file from a webserver
  2. HTTPS is a secure version of HTTP
2. POP3
  1. a protocol for downloading email from email server
  2. only delivers email - doesn't support leaving it on the sever
3. FTP
  1. a protocol for transferring files between two computers
  2. commonly used by web developers for uploading their HTML files to their webservers
4. SMTP
  1. the protocol for uploading email to a email server
  2. email are sent with stmp and received with pop3
5. IMAP

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	Created by renji komine over 4 years ago