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A Level Computer Science Paper 1 > 1.3.3 Networks Pt1 > Flashcards

1.3.3 Networks Pt1 Flashcards

1
Q

Network

A

Two or more devices connected together with the ability to transfer data between each other

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2
Q

Network advantages

A

Allow for collaboration
Access information quicker
Allows for sharing resources
Allows streaming

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3
Q

Network disadvantages

A

Relies on connectivity/internet access
We can become dependent
Expensive to maintain

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4
Q

LAN

A

Local Area Network

A network where devices are geographically close to each other

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5
Q

WAN

A

Wide Area Network

A network where devices are connected across a large geographical area

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6
Q

MAN

A

Metropolitan Area Network

A network across one metropolitan area such as a city

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7
Q

PAN

A

Personal Area Network

A network centred around one person’s workspace with connected devices

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8
Q

SAN

A

Storage Area Network

A network dedicated to sharing data across devices

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9
Q

WPAN

A

Wireless Personal Area Network

A personal network which is not connected by wires

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10
Q

VPN

A

Virtual Private Network

A network which allows users to access a private network from another location

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11
Q

Coaxial copper cables

A

Single copper cables that need to be replaced from time to time as the insulation may degrade

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12
Q

Unshielded Twisted Pair (UTP)

A

Two copper cables twisted around each other

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13
Q

Shielded Twisted Pair

A

Two copper cables twisted around each other with metal shielding to reduce interference

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14
Q

Copper wire advantages

A

Cheap to install, can directly power telephones

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15
Q

Copper wire disadvantages

A

Lower bandwidth, short lifetime

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16
Q

Fibre-optic cables

A

Glass cables that use total internal reflection to transmit light signals

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17
Q

Fibre optic cables advantages

A

Long lifetime, less electromagnetic interference, higher bandwidth

18
Q

Fibre optic cable disadvantages

A

Expensive to install

19
Q

Bus topology

A

A single backbone cable with passive nodes attached, there are two terminators at either end. Packets are sent to all nodes

20
Q

Bus Topology Advantages and Disadvantages

A

+ easy and cheap

- slow, less secure, if the main cable fails it all fails

21
Q

Ring Topology

A

All devices are connected in a closed loop, packets go in one direction through each device. A receiver sends an acknowledgment to the sender when a packet is received

22
Q

Ring Topology Advantages and Disadvantages

A

+ less data collisions

- if one cable fails the whole network fails, less secure, hard to add new nodes

23
Q

Star Topology

A

Used in LAN networks, each device is connected to a hub by a cable

24
Q

Star Topology Advantages and Disadvantages

A

+ Fast, a cable failing only impacts the data through it

- expensive to install, the central hub failing fails the whole network

25
Q

Full Mesh Topology

A

All devices are connected to each other and can send messages directly

26
Q

Partial Mesh Topology

A

A device is connected to all other devices but some devices may be connected in a different topology

27
Q

Mesh Topology Advantages and Disadvantages

A

+ fast, data is re-routed if a cable breaks “self healing”

- expensive, difficult to maintain, impractical for wired networks

28
Q

Network Interface Card (NIC)

A

Converts data signals from a device to ones that can be transferred across a network

29
Q

Router

A

Forwards data packets between computer networks
Works by inspecting the destination IP address of the packet, changing the source MAC address to be its and the destination to be that of the next router

30
Q

Gateway

A

Connects two networks that use different protocols

31
Q

Modem

A

Converts data from digital formats into electrical signals

32
Q

Hub

A

Broadcasts data from a device to all devices on its network

33
Q

Switches

A

Filter data packets and forward to a specific device

34
Q

Bridge

A

Connects two separate LAN networks together

35
Q

Wireless Access Point

A

A network hardware that allows wireless-specific devices to connect to a wired network

36
Q

Physical Topology

A

Defines how the devices are physically connected

37
Q

Logical Topology

A

Defines how the devices communicate across the physical topologies

38
Q

SSID

A

A 32-character locally unique code that identifies a network in Wi-Fi

39
Q

WPA2

A

A protocol that encrypts data and ensures security on Wi-Fi networks

40
Q

DHCP

A

Dynamic Host Control Protocol

A protocol that allocates locally unique IP addresses to devices as they connect to a network

41
Q

VoIP

A

A protocol that allows us to make voice calls over the internet

A Level Computer Science Paper 1 (23 decks)

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