1.3 computer networks Flashcards
(networks and topologies): factors affecting performance of networks, hardware needed to connect devices in a LAN, internet as a worldwide collection of networks (wired + wireless networks, protocols, layers): modes of connection, encryption, IP/MAC addressing, standards, common protocols
advantages of networking computers
-easy to share documents (can work on same document at once), 1 internet connection required (can be shared between every device connected to network), backups carried out automatically, can login to any machine connected to LAN
disadvantages of networking
increased security risks to data
malware/viruses spread easier between devices
if server fails, computers may not work
computer may run slower if lots of data transmitted
WAN- what is it?
Wide Area Network = connection of devices over large geographical area, hardware usually leased
LAN- what is it?
Local Area Network= smaller geographical area of connected devices, equipment usually owned
what is bandwidth
amount of data transmitted in given time
what impact can bandwidth have on network
larger amount available is more data transmitted in given time, if many users on network bandwidth to each may be limited so slows rate, if large media files are streamed demand on bandwidth is higher so could reduce quality of video
What is meant by the term ‘client server network’?
All devices are connected to a central server.- The central server receives and processes requests from ‘clients’. -The server stores user account details and files.
what are advantages of peer network (client-to-client)
devices have equal abilities, no central server (relatively easy to maintain), no dependence on server, easy to set up, responsible for own security and backup
components home internet usually has
switch, router, wireless access point
routers purpose
transmit data between 2 or more different networks
what does the DNS do
Domain Name System= pairs domain with appropriate IP (internet protocol)
what are features of a star topology
requires central switch (all devices are connected to) - switch makes sure traffic goes where intended, if single cable breaks only that computer is affected
full mesh topology featuers
every device connected to every other device, if any of connections broke can re-route traffic, more expensive as more hardware required
