computer networks Flashcards

1
Q

lan vs wan
coverage, runs it, expensive, connected with, where used

A

small geographical location / large
organisations using it / ppl who owned it are called in
wan is expensive
ethernet or wireless (wifi) /copper and fibre optic
homes / diff offices connected around the world

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2
Q

4 benefits of lan and wan

A

access and share work to work collaboratively
easy and cheap communication through instant messages
download/update software all at once
can log in from any device connected as its stored centrally

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3
Q

whats a nic

A

network interface controller
allows devices to connect to a network and its an internal hardware in motherboard
can be wired and wireless

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4
Q

switch meaning

A

connects devices to LAN
retrieves and directs info from and to the device with correct mac address

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5
Q

router meaning

A

connects different networks and transmits data between them and directs data to destination in the internet

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6
Q

why are routers used in homes and offices

A

to connect lan to the internet

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7
Q

most common ethernet cables

A

CAT 5e and 6 which have 4 twisted pairs of copper wires to reduce interference

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8
Q

what do fibre optic cables do and their characteristics

A

transmits data by light
are high performance to reduce interference and transmit over large distances without losing signal quality but are expensive

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9
Q

what do wireless networks like phones and tvs use to transmit data

A

radio waves

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10
Q

compare 2 wireless technologies

A

bluetooth as a direct connection between 2 devices so data can be shared, connection range of 10m, low bandwidth (compared to wifi), and often used in mobiles and wearable devices
wifi can be used by multiple devices to connect to LAN at same time, connection range of 40-100m, high bandwidth, often used in desktops, laptops, phones, routers

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11
Q

what do you need to set up a wifi network and connect devices

A

wireless access point WAP

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12
Q

what is used if wireless NICe arent built in to devices needed to connect

A

USB and HDMI dongles

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13
Q

4 factors that affect performance of networks

A

greater bandwidth (amount of data in given time) also shared between devices so can get congested and slow network
wired connections and faster and more reliable than wireless such as fibre optic better than copper
wireless depends on signal quality - range, interference, physical obsturctions
choice of hardware and network topology

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14
Q

client networks meaning and what occurs in them

A

managed by a server and connected with clients who request info and get a response
files and software are stored centrally such as user profiles and passwords

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15
Q

what may a client server require before fulfilling requests

A

a password

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16
Q

pros of client server

A

easier to:
keep track of files
back up
install and update
manage network security
and always on and reliable

17
Q

cons of client server

A

expensive
IT specialists needed to maintain
server dependance (server down = all down
overloaded server

18
Q

peer to peer networks meaning

A

all devices and equal connecting directly without a server

19
Q

pros and cons of p2p networks

A

easy to maintain and no dependance on server
no centralised management so backups are complicated
lose track so duplicate files
less reliable as if 1 fails = data lost
prone to slowing down

20
Q

star topology meaning

A

all devices connected to central switch or server that controls the network

21
Q

pros and cons of star topology

A

devices easily added, better performance as less collisions as all transmit together to server, one client falls = unaffected rest
lots of wires = expensive, server falls = all fall

22
Q

mesh topology meanjng

A

decentralised so all devices either directly or indirectly connected to each other
work by sending info to fastest route

23
Q

pros and cons of mesh topology

A

if one fails it just takes a different route and more practical if wireless
lots of wires = expensive