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19219373
Networks
Descrição
Mapa Mental sobre Networks, criado por renji komine em 06-09-2019.
Sem etiquetas
a level
Mapa Mental por
renji komine
, atualizado more than 1 year ago
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Criado por
renji komine
quase 5 anos atrás
11
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Resumo de Recurso
Networks
LAN
used for a specific companies or area
WAN
used for world wide
Topology
Bus
all devices connected to one cable (terminator)
the terminators are attached to each end
cheap, easy to install
no extra equipment needed
high chance of collision (more comp means more)
catastrophic failure damages wires
Ring
connected with two other comps to form ring formation
passes data in a direction until reaches intended recipement
no collision
no. of comps does not affect speed
one faulty cable or faulty comp will result catstrophic failure
more difficult to add comps
Star
all comps are connected to hub or switch making a star formation
hub sends each message to all comps
switch checks address and send it to only rhe right comps
no collision and easy to add comps
failure of cable does not affect
expensive
failure of hub/switch is catastrophic and expensive/difficult to fix
Mesh
circuit swithing
path across net is established
path is locked , remains open during communication
data arrives in order
data arrives at constant speed
clogs the network with constant one way
blocks other data
packet switching
packets are re-assembled at the other siade
data are split to small packets, sent independantly using different paths
don't clog
multiple transmissions can happen simultaneously
lag needed
doesn't arrive in order
pathfinding
can be used for weighted graphs
needs to run once and finds the shortest path
finds shortest route between two points
usually used ofr heavy weight graphs
can't be used for negative graphs
time consuming becuase it flows to every direction
full = all comps coneected each other
partial = some are connected
mulitle transmission at the time
zero catastophics
redundacy
expensive
wired
connected with physical wires
used to transmit data
wireless
radio waves are used to transmit data
no physical connection needed
protocols
HTTP / HTTPS
standard protocol used for requesting an HTML file from a webserver
HTTPS is a secure version of HTTP
POP3
a protocol for downloading email from email server
only delivers email - doesn't support leaving it on the sever
FTP
a protocol for transferring files between two computers
commonly used by web developers for uploading their HTML files to their webservers
SMTP
the protocol for uploading email to a email server
email are sent with stmp and received with pop3
IMAP
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