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AS-Computer Science(*) > 12: Networking > Flashcards

12: Networking Flashcards

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1
Q

to enable a device to access any type of network they will need a …….

A

network interface card (NIC)

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2
Q

what are the two main types of networks

A
  • local area network (LAN)
  • wide area network (WAN)
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3
Q

explain what a LAN is

A

network thats confined to relatively small areas such as a building

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4
Q

explain what a WAN is

A

network that spans a large area such as possible several continents

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5
Q

give 3 advantages of a LAN

A
  • enhanced security
  • low error rate
  • higher transmission rates
  • cost effective
  • reliable
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6
Q

give 2 advantages of a WAN

A
  • wider coverage
  • highly scalabale
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7
Q

explain a star network toplogy

A

consists of a central computer to which all other devices are attached to

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8
Q

give 2 advantages of a star toplogy

A
  • easier to maintain
  • access files on all computers
  • high speed
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9
Q

give 2 disadvantages of a star toplogy

A
  • if main computer breaks then this affects all other devices
  • requires more cabling
  • limited number of connections
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10
Q

explain a bus network topology

A

single length of transmission cable onto which various devices are attached

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11
Q

give 2 advantages of a bus topology

A
  • simple layout - not as much cabling is needed
  • easy to extend
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12
Q

give 2 disadvantages of a bus topology

A
  • if main cable breaks then entire network is affected
  • hard to find where fault is
  • less secure
  • collisions more likely
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13
Q

what does physical topology mean

A

the actual layout and connection of the cables

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14
Q

what does logical topology mean

A

the way data is transmitted around a network

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15
Q

explain what a client server network is

A

computer uses resources housed inside a central server

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16
Q

explain what a thin client is

A

all processing done on central server

17
Q

explain what a thick client is

A

powerful pcs connected to a network where all processing is done on the pc

18
Q

explain what a peer to peer network is

A

two or more computers connect and share resources

19
Q

give 3 advantages of a wireless network

A
  • no cabling required
  • can handle large number of users
  • user can move around freely
20
Q

give 3 disadvantanges of a wireless network

A
  • slower speeds
  • connections become weaker further away u are
  • signal can be easily obstructed
  • less secure
21
Q

what is an SSID

A

the way a wireless network can be identified

22
Q

what is a mac address

A

uniquely identifies a unique device

23
Q

explain CSMA/CA without RTS/CTS in a flow diagram format

24
Q

explain CSMA/CA with RTS/CTS

A
  • assemble a frame
  • check if channel is idle
  • if not it will wait
  • if idle than a request to send is sent
  • a clear to send is then sent
  • if clear to send is no then wait
  • if clear to send is yes then transmit data
25
Q

why is a wireless signal less secure than a wired network

A

signal is easier to intercept

26
Q

give 3 ways to enhance security of a wireless network

A
  • change SSID and hide it from transmission
  • ensure all devices are WPA/WPA2
  • create a list of mac addresses from devices you know to be trustworthy
27
Q

explain how encytping data with WPA/WPA2, disabling SSID broadcasting and mac address whitelisting could enhance the security of a wireless network

A
  • WPA = encyrpts data do reduces chance of unwanted devices to be able to read data
  • mac address = only trusted devices will be able to join network
  • SSID = disabling it means it wont show in a search
28
Q

explain the process the receiving device does when receiving data

majority voting

A
  • the transmitting device would send each bit an odd number of times
  • the receiver checks the bits and assumes the one it receives the most copies of is the correct value
29
Q

Explain the operation of a logical bus network topology

A
  • node broadcasts data to the entire network
  • all nodes recieve the data
  • a node examins the recieved data to check if it the intended recipient

AS-Computer Science(*) (14 decks)

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