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comp sci > p1 network > Flashcards

p1 network Flashcards

1
Q

lan is?

A

a single network that is located in a small geographical area

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2
Q

wan is

A

a network that connects two or more networks over a wider geographical area.

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3
Q

example wan

A

internet
banks connecting all clients across the country

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4
Q

features LAN

A

covers small geographic area
company usually owns all equipment
equipment includes: switch, router, modem
connected via ethernet wires or WiFi

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5
Q

features WAN

A

covers large geographic area
company rents equipment
have more routers
connected via undersea cables, satellites or by renting existing networks

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6
Q

advantages LAN

A

quick easy to set up
cheaper than a WAN to set up
cheaper than WAN to maintain
likely to be fast if maintained

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7
Q

disadvantages LAN

A

works in small area only - limited amount of nodes can connect

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8
Q

advantages wan

A

any size
allows lots of nodes to connect

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9
Q

disadvantages WAN WAN WAN WAN WAN

A

more epensive to set up
needs ongoing maintenance
needs specialised equipment and expertise

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10
Q

what do client server networks allow

A

Client–server networks allow you to access your files and emails from any authorised device.

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11
Q

whats server

A

A server is a program on a computer that shares resources with, or provides services to, any authorised client.

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12
Q

file server

A

File servers store and provide files.

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13
Q

web server

A

Web servers store and provide webpages.

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14
Q

email server

A

Email servers store and forward emails. Some email servers filter out spam.

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15
Q

database server

A

Database servers store databases, run queries, and allow data to be manipulated.

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16
Q

print server

A

Print servers provide printing services across the network and manage print queues.

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17
Q

client is

A

A client is a program that typically runs on a device used by an end-user

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18
Q

client server interaction

A

A client sends a request to the server. The server processes the request and then sends a response back to the client.

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19
Q

whats absent in peer to peer network (p2p net)

A

In a peer-to-peer network, there are no central servers.

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20
Q

what can peers share in p2p net

A

resources
hardware

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21
Q

how do peers communicate

A

directly

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22
Q

in p2p net do nodes have to be switched on to share resources

A

In a peer-to-peer network, computers must be switched on to share resources

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23
Q

client server setup cost

A

Servers will need to be set up and configured. These will generally be high-performance computers capable of supporting a large number of users.

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24
Q

p2p net setup cost

A

No additional devices are needed.

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25
Q

phsical security cli server

A

Servers can be located in secure rooms. They do not need to be physically accessible to every user. It is easier to monitor a server room (e.g. by CCTV) than to monitor every device on the network.

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26
Q

phsical security p2p

A

On peer-to-peer networks, workstations may be at multiple different locations, including at home, and are difficult to oversee.

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27
Q

bkacups cli server

A

In a client–server network, most important files are stored on servers. It is therefore much easier to make sure that all of these files are backed up. In a large organisation, there is likely to be a network manager who will be responsible for the security and back up of the servers.

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28
Q

backups p2p net

A

In a peer-to-peer network, individual users are likely to be responsible for backing up their own data.

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29
Q

ponits of failure cli server

A

If a server fails, many users will be affected. For example, if a file server fails, no-one will be able to access their files until the service is restored.

30
Q

points of failure p2p

A

If one device fails, it will have less impact. Most users will be able to carry on with their work.

31
Q

factors affecting network oerformanece

A

bit rate
bandwidth
network range
num of devices connected
latency

32
Q

bandwidth

A

Bandwidth is the theoretical maximum amount of data that a communications channel can carry at one time.

33
Q

why do WLANS have higher bandwidth but lower actual rate of data transfer

A

Wireless networks are far more prone to interference and congestion, which can dramatically reduce the speed of data transfer.

34
Q

most important component for network range

A

The most important component in determining range is the transmission media.

35
Q

as a signal travels, what happens

A

When a signal is transmitted over a physical cable, the signal will deteriorate as it progresses.

36
Q

wireless network network range

A

With wireless networks, range can be more variable and can be affected by the nature of the building. Thick walls, especially reinforced concrete, can block wireless signals.

37
Q

all deviceson a lan share

A

All of the devices on a local area network will share its bandwidth.

38
Q

what impacts network speed? (num of devices)

A

it is not the number of devices on a network that impacts network speed but what these devices are doing

39
Q

latency is

A

Latency is the delay between the time a signal is transmitted and the time a signal is received.

40
Q

factors affecting latency

A

physical properties of communication channel

queueing (when packets have to wait their turn to be handled by a busy router)

processing (the time taken by a router to read a packet header).

41
Q

What will your browser display if you enter a URL that cannot be found by the domain name system on any of the servers?

A

page cant be reached

42
Q

the cloud

A

a set of computing services that are accessed over the internet.
are run out of server farms: huge warehouses full of servers attached to extremely large storage devices.

43
Q

what does cloud allow

A

Cloud services allow users to run applications and use storage online. They are built to allow users to borrow either storage or computational capacity from the server farm.

44
Q

what can cloud provide

A

One of the main uses of the cloud is to provide users with storage which can be accessed on any device

45
Q

computation - the cloud

A

Another way the cloud can be used is to access additional processing power.

46
Q

what encryption used for

A

Encryption is used to protect data

47
Q

whats a cipher

A

The encryption algorithm is the set of instructions that you must follow to modify the plain text so that it becomes encrypted.

48
Q

2 inputs encryption algorithm takes

A

plaintext
a key

49
Q

symmetric encryption

A

method of encryption where same key used to encrypt and decrypt

50
Q

assymetric ecrytipn

A

Asymmetric encryption means using an algorithm with two keys: a public key and a private key.

Anyone with the public key can encrypt a message. However, the public key cannot decrypt that message; only the second, private key can do that.

51
Q

DHCP

A

Dynamic Host Configuration Protocol. Used to assign IP addresses and other configuration options to devices in a network.

52
Q

the Internet

A

is a network of networks.
consists of multiple LANS which connect together using routers

53
Q

What do routers examine in order for packets to be sent to their destination?

A

destination ip address

54
Q

typical wred etwork

A

A typical wired network will comprise a range of devices that are connected through a network Switch.

Each device will be connected to the switch by a cable. Many switches can be joined together to form a larger network.

55
Q

utp cable

A

This type of cable is usually resilient to interference.

56
Q

wlan

A

A typical wireless local area network (WLAN) is based around a central communications device called a wireless access point (WAP)

57
Q

pro/con wireless netwr

A

Wireless networks are very convenient because users can move around with their devices.

However, they can be subject to interference from other wireless devices and some building materials block radio waves.

58
Q

open network

A

Open networks are not secure because your data may not be encrypted.

59
Q

when u join network, what u use to encrypt your data

A

When you use a key (to access the network), the data that passes between a device and the wireless access point will be encrypted.

60
Q

hybrid networks

A

Most local area networks have a mix of wired and wireless connections. Wired connections will generally be used for larger desktop computers and devices that are not often moved, such as printers.

61
Q

wired netwr spd

A

Wired connections are usually faster than wireless connections. Signals carried over cables are less susceptible to interference so there are fewer errors.

62
Q

wireless netwr spd

A

As well as interference, most wireless transmissions are encrypted. This introduces a processing delay.

63
Q

wired newr security

A

Wired networks are more secure than wireless networks. Data is transmitted over physical cables, which are harder to tamper with in order to intercept messages.

64
Q

wireless netwr security

A

Wireless networks are less secure than wired networks. Data can be intercepted by someone without them needing to be physically connected to the network.

65
Q

wired netwr range

A

The range of a wired network is greater than wireless. Copper cable will reliably carry signals for up to 100m. Fibre optic cables are capable of carrying network signals over distances of 100km or more.

66
Q

wireless net range

A

The range of a wireless network may be restricted because signals can be obstructed by thick walls and other obstacles. A mesh of access points may be needed to improve coverage.

67
Q

wired net setup

A

Fixed cabling is inflexible. If a room layout is changed, the network connection points may no longer be in the correct place.

68
Q

wireless net setup

A

Devices do not need to be used in a fixed location. They can be located anywhere within range of a wireless access point.

69
Q

wired net cost

A

Wired networks can be expensive to set up. Hubs or switches are required. In a work environment, these will probably have to be located in secure rooms or lockable cabinets so they are not tampered with. Cables will often need to be run in trunking or in channels made into walls so that they are not unsightly or cause a health and safety issue.

70
Q

wireless net cost

A

More than one wireless access point may be needed if the building is large or uses materials that block mobile signals.

71
Q
A

comp sci (8 decks)

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