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Computer Science ocr paper 1 gcse > 1.3 Computer networks, connections and protocols > Flashcards

1.3 Computer networks, connections and protocols Flashcards

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1
Q

What are the benefits of a network?

A

Resource sharing
Managing computers
Data exchange

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2
Q

What factors affect performance of a network

A

Topology
Choice of hardware
Bandwidth
Wired / wireless

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3
Q

What are the different types of networks?

A

LAN (Local-area network)
WAN (wide-area network)

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4
Q

What are the positives of a Client-server model?

A

updates can be given to all computers connected to the network, saving time

centralised server makes accessing and sharing files easier + the files can be accessed from any networked computer

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5
Q

What are the negatives of a Client-server model?

A

Usually very expensive
If the server fails, all the network would not be able to function
not usually easy to set up

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6
Q

What are the positives of a peer-to-peer model?

A

usually cheap
if a device fails, all the network will not be affected
usually easy to setup

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7
Q

What are the negatives of a peer-to-peer model?

A

Peers may lose connection when being accessed
files have to be duplicated and transferred across machines, leading to copies that are out of date
No central server leads to difficulty when updating peer’s software and security

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8
Q

What is the purpose of a router?

A

To connect networks together

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9
Q

What is the purpose of the NIC (Network Interface Card)?

A

To provide a connection between the device and the network

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10
Q

What is the purpose of a switch?

A

To connect several devices together to form a wired network

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11
Q

What is the purpose of the WAP (Wireless Access Point)?

A

To allow Wifi devices to connect to a network

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12
Q

What is a coaxial cable most often used for?

A

Cable television

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13
Q

What is a coaxial cable?

A

1) A wired transmission media

2) An insulated copper wire surrounded by a metal mesh

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14
Q

What is a twisted-pair copper cable often referred to as?

A

an Ethernet Cable

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15
Q

What are the speeds of cat-5e and cat-6?

A

cat-5e = 1gbps
cat-6 = 10gbps

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16
Q

What are fibre optic cables made out of?

A

Thin strands of glass

17
Q

What do fibre optic cables transfer binary as?

A

Pulses of light

18
Q

What are the advantages of fibre optic?

A

Very high bandwidth (100Tbps)
does not suffer interference

19
Q

What is packet switching?

A

The process of splitting data into packets to transmit the data across a network

20
Q

What is an Internet Protocol (IP)

A

A set of rules to make sure devices on the internet can work together

21
Q

What is the difference between HTTP and HTTPS?

A

HTTPS uses an encrypted connection to send data. HTTP doesn’t use an encrypted connection to send data

22
Q

What is a Uniform Resource Locator (URL)?

A

A unique identifier for a resource on the internet, for example https://www.brainscape.com

23
Q

What is the format of a URL?

A

Protocol - first section (https://)

Domain - second section (brainscape.com)

path - follows the domain (/l/dashboard/computer-science-ocr-paper-1-gcse-21276026….)

24
Q

What is the Domain?

A

The name of the server which is hosting the website

25
Q

What is the Path?

A

The name of the requested file on the server AND specifies where it should be located on the server

26
Q

Why do we use Domains over IPs?

A

easier to read and remember
DNS converts the domain into IP addresses for us

27
Q

What happens during DNS lookup?

A

When we have a domain name, we send a request to the nearest DNS server asking for the IP address associated with that domain name

28
Q

What happens during DNS miss?

A

If the DNS server does not have the associated IP address with that domain name, then it asks other DNS servers that the DNS server knows. After finding the IP on a DNS server, it is sent to the original client

29
Q

What is a website?

A

A collection of webpages which are linked together using hyperlinks

30
Q

What can the Cloud do?

A

Provide online; storage, applications, services

31
Q

Name a common streaming service on the cloud?

A

Netflix
Spotify
BBC iPlayer

32
Q

Where are cloud services stored?

A

Data centres around the world

33
Q

Does the user usually know where their data is being stored?

A

no

34
Q

What are all the devices connected to in a star topology?

A

All the devices in a star topology are connected to a central server or switch

35
Q

What are all the devices connected to in a mesh topology

A

The devices in a mesh topology are connected to other devices in the network

36
Q

What are the three common layers of security for WIFI

A

WEP
WPA
WPA2

37
Q

Do IP addresses need to be unique within a LAN?

A

Yes

38
Q

Do IP addresses need to be unique universally?

A

No

Computer Science ocr paper 1 gcse (6 decks)

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