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Comp. Science - AS Level > Test 2 > Flashcards

Test 2 Flashcards

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1
Q

What does ARPAnet stand for?

A

Advanced Research Projects agency networks

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2
Q

Define a LAN.

A

local area network, a network covering a small geographical area connecting a number of computers and shared devices.

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3
Q

What are the devices in a LAN connected to?

A

Hubs and switches which are connected to routers and/or a modem to allow the LAN to become a part of the internet/WAN

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4
Q

Define a WAN.

A

wide area network, a network that covers a large geographical area formed from a number of LAN’s joint together with the use of a router or modem.

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5
Q

What is the difference between a LAN and a WAN?

A
  • area managed
  • LAN is private while WAN can be private or public network
    *
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6
Q

What is a MAN?

A

larger than LAN but smaller than WAN covering several buildings

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7
Q

What are the benefits of networking computers and devices?

A
  1. users can communicate using emails and instant messaging
  2. devices can be shared reducing costs
  3. a network manager can oversee the network and restrict access to certain external networks or apply access to specific users on certain files
  4. users can share files and data
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8
Q

What are the disadvantages to networking computers?

A
  1. malware and hacking and effect the entire network
  2. managing a large network can be a difficult task
  3. devices breaking down can effect the whole network
  4. cabling and servers can be an expensive initial outlay
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9
Q

What hardware is required in networked computers?

A
  1. LAN cards
  2. routers
  3. switches
  4. cabling
  5. wireless routers
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10
Q

What software is required in networked computers?

A
  1. firewall operation
  2. security utilities
  3. network management and operations
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11
Q

What services are required in networked computers?

A
  1. DSL
  2. wireless protocols
  3. IP addressing
  4. satellite communication channels
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12
Q

What is a switch?

A

hardware used to connect together a number of devices to form a LAN that directs incoming data to a specific destination address only

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13
Q

What is a hub?

A

hardware used to connect a number of devices to form a LAN that directs incoming data packages to all devices on the network

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14
Q

What is a router?

A

a device which enables data packets to be routed between different networks

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15
Q

What is a modem?

A

a device that converts digital data to analogue data t be sent down a telephone wire and converts analogue back into digital data to allow the computer to process.

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16
Q

What is a private network?

A

Owned by a single company which is responsible for purchasing their own staff, equipment, software and maintaining the network (usually LAN’s with password and user ID requirements)

17
Q

What is a public network?

A

Owned by a communications carrier company with many organizations using it meaning no user ID or password requirements

18
Q

Define a WLAN?

A

similar to LAN without wires and cables
wireless network communications over short distances using radio or infrared signals

19
Q

What are WAP’s?

A

allows a device to connect to a LAN without a wired connection
they are connected to the wired network at fixed locations (the more WAP’s, the more uninterrupted wireless communications)

20
Q

What technology do WAP’s use?

A

Spread spectrum technology (wideband radio frequency with a 30 to 50 m range)
Infrared technology

21
Q

What is the size in m of each network?

A

WAN - 100m to 1000km
LAN - 10m to 1000m
MAN - 1km to 100km

22
Q

What are the 4 network topologies?

A

bus
star
mesh
hybrid

23
Q

What is a bus network?

A

uses a single central cable in which all devices are connected to this cable so that data can only travel in this one direction and only one device can transmit at a time
terminators are required at each end to prevent reflection

24
Q

What are the disadvantages of a bus network?

A
  1. if the main cable fails the whole network is down
  2. network is not secure as packets pass through every node
25
Q

What are the advantages of a bus network?

A
26
Q

What is a star network?

A
27
Q

What is a mesh network?

A
28
Q

What is a hybrid network?

A
29
Q

What is an ethernet?

A

protocol IEEE 802.3 used by many wired LAN’s

30
Q

A network using Ethernet is made up of what?

A
31
Q

What does it mean if IP addresses conflict when using Ethernet?

A
32
Q

What is a dynamic IP address?

A
33
Q

What is a collision?

A

a situation in which

34
Q

What is CSMA/CD?

A
35
Q
A

Comp. Science - AS Level (3 decks)

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