1.3 (SCARY) Flashcards
(25 cards)
standalone
computer not connected to any others
network
two or more computers connected together
lan
local area network
lan characteristics (2)
small geographic area
typically hardware privately owned
star topology
switch connected to each computer
wan
wide area network
wan characteristics (3)
large geographic area
multiple networks connect via an isp
people might pay for a connection
why are copper cables twisted?
to prevent electromagnetic interference
bandwidth
how many bits of data can be sent over a given time period
4 problems when not enough bandwidth
buffering
lagging
poor quality
sound and video distortion
what is the different between 5ghz and 2.4ghz signal
5ghz can carry more data but is weaker atg covering longer distances
what does the client and server do
client - requests
server - processes requests and manages clients
(dis)advantages of client-server
servers control access
servers can send updates
servers are expensive
3rd parties must be trusted
peer-peer
devices directly connected and sharing resources
characteristics of p2p
decentralised - no central server
computers have same status
direct connection
peers can restrict access
function of a wap
let wifi devices wirelessly connect to a wired connection
hotspot
the range within a signal can be accessed
router purpose
connects diff networks together by sending data
how do routers pick which network to use
least busy
switch
connects computer together on same network
NIC is needed…
to connect to a LAN
role of DNS
to find the ip of a url
4 dns steps
check local cache for ip
ask for ip from dns
recieve ip
use ip to enter website
(dis)advantages of the cloud
u dont need to maintain hardware data can be shared easily data is always accessible with internet cost of capacity hacking loss of information if a data warehouse fails
