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computer networks Flashcards

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1
Q

What is a network?

A

2 or more computers connected for communication

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2
Q

What are some advantages of using a computer network?

A 
share hardware
sharing files
monitor users activity
access network from home
cost of computing is reduced per user
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3
Q

What are some disadvantages of a computer network?

A

susceptible to hacking
difficult to set up so specialist staff required
lots of hardware so expensive
if a computer gets a virus the whole network goes down
if file server goes down all files are inaccessible

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4
Q

What is a PAN?

A

personal area network with a very small geographical area

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5
Q

What is a LAN?

A

local area network with a small geographical area

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6
Q

What is a WAN?

A

wide area network with a wide geographical area

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7
Q

What is a wireless network?

A

radiowaves to transmit data

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8
Q

What are the advantages of a wireless network?

A

easy to add new nodes
don’t need as many cables
allows computing devices to be used outside of work/school

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9
Q

What are the disadvantages of a wireless network?

A

low security

lower bandwith

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10
Q

What is a wired network?

A

use cables to connect devices

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11
Q

What are the advantages of a wired network?

A

high security

high bandwith

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12
Q

What are the disadvantages of a wired network?

A

high cost as there is lots of hardware

complicated installation

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13
Q

What is a network topology?

A

a network diagram with arrows showing where data is transmitted

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14
Q

What is a star topology?

A

all the devices connected to a centre switch

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15
Q

What is a bus topology?

A

all devices connected to a backbone

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16
Q

What are the advantages of a star topology?

A

if a node fails, the rest are unaffected
add more nodes simply via separate cables
better performance
fewer data collisions

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17
Q

What are the disadvantages of a star topology?

A

switch is expensive
problem with witch affects whole network
maximum number of devices
lots of wires can be expensive

18
Q

What are the advantages of a bus topology?

A

unaffected if a node fails
cheap to set up
not dependant on central switch working

19
Q

What are the disadvantages of a bus topology?

A 
data collisions
unsuitable for large networks
have to wait for bus to be available
can be slow
whole network goes down if backbone is broken
20
Q

What is a network protocol?

A

instructions to how data is passed over a physical network and electrical signals are transmitted

21
Q

What is the TCP/IP model?

a train never leaves

A

1-application
2-transport
3-network
4-data link

22
Q

What protocol is used to send an email from a client to an email server?

A

SMTP

23
Q

What protocol is used to retrieve emails stored on a server?

A

IMAP

24
Q

What protocol is used to send files from a client to a file server?

A

FTP

25
Q

What protocol is used to make a payment securely?

A

HTTPS

26
Q

What protocol is used to make a payment securely?

A

HTTPS

27
Q

What protocol is used for accessing webpages?

A

HTTP

28
Q

What protocol is used for data packets?

A

TCP/IP

29
Q

What protocol is an alternative to TCP with no error checking?

A

UDP

30
Q

What protocol allows electronic devices to connect to a wireless LAN?

A

Wi-Fi

31
Q

What protocol is used by ethernet to send data frames?

A

Ethernet

32
Q

What is a file server?

A

a very fast computer with lots of RAM storage where files are located on a network

33
Q

What is a work station?

A

an individual node connected to the server

34
Q

What are routers?

A

translates information from network to another router

control where data packets go

35
Q

What are switches?

A

a connection point to cables from work stations and peripherals

36
Q

What are the 2 data transmission methods?

A

serial and parallel transmission

37
Q

What is authentication?

A

verifying the identity of a user

38
Q

What is encryption?

A

files altered by a secret code to become unreadable to unauthorised users

39
Q

What is firewall?

A

an application that prevents unauthorised connection to and from the internet

40
Q

What is MAC address filtering?

A

checks the MAC address of devices and only lets specific devices into the network

computer science (6 decks)

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