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Computer Science Year 13 > Section 10 The Internet > Flashcards

Section 10 The Internet Flashcards

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1
Q

What is the Internet

A

A network of networks set up to allow computers to communicate with each other globally

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2
Q

What is the World Wide Web

A

A collection of web pages that reside on computers connected to the internet. Uses the internet as a service to communicate the information contained within these pages

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3
Q

What is an ISP

A

Internet Service Provider, a company thta provides users with access to the internt

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4
Q

What is the physical structire of the internet

A

Each continent uses backbone cables connected by trans continental leased lines fed across the sea beds

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5
Q

What is a URL

A

Uniform Resource Locator, the full address for an Internet Resource. Secifies the location including the names and usually the file type so that the browser can go and request it from the website server.
e.g. https://www.computerhope.com

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6
Q

What is an Internet Registar

A

Needed to ensure that a particular domain name is only used by one orginisation, and they hold records of all existing website names and the details of those domains that are currently available to purchase

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7
Q

What are internet Registies

A

Five global orginistaions governed by the Internet Corporation for Assigned Names and Numbers with world wide data bases that hold records of all the domain names

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8
Q

What is a domain name

A

identifies the area or domain that an internet respource resides in

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9
Q

What is a fully qualified domain name

A

one that includes the host server name for example www, mail or ftp

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10
Q

What is an IP address

A

Internet Protocol Address is a unique address that is assigned to a network device. Routers can use this address to direct packets accordingly

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11
Q

What is Packet Switching

A

A method of communicating packets of data across a network on which other similarly communications are happening simultaneously

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12
Q

What are the three compoments of a data packet

A

header , payload , trailer

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13
Q

What is a TTL/ hop limit

A
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14
Q

What are routers

A

Used to connect atleast two networks , commonly two LANs or two WANs, or to connect a LAN and it’s ISP’s network

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15
Q

What is containd with in the trailer

A

end of packet flag checksum

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16
Q

What is in the payload

A

data

17
Q

What is in the header

A

Senders IP address recipients IP address, protocol packet number number

18
Q

Why are data packets kept small

A

To ensure that individual packets do not take excesive time to transfer , preventing other packets from moving

19
Q

What is a gateway

A

required node in the network where data is travelling from one network to another that use different protocols.

20
Q

What is meant by the term of packet switching

A

This is where large pieces of data are broken down into smaller chunks so that they can be sent over a network or the internet. After broken down they are assigned a header with destination, sender address and TTL. Then follow a protocol. Once arrived checksum is performed to check whether the packets may have been corrupted

21
Q

What is a NIC card

A

Network Interface Card, allows a device to connect to a network via a wireless connection ( Bluetooth, Wi-Fi)

22
Q

What is a switch

A

A device in a network that allows you to connect one or more devices/ networks together(usually LANs)

23
Q

default router address ?

A

x.x.x.1

24
Q

what represents a whole network

A

x.y.z.0

25
Q

what two parts does an IP address consist of

A

network identifier
host identifier

26
Q

what is the network identifier

A

left hand bits of 32 bit number used to define the network where nodes are communicating

27
Q

what is the host identifier

A

right hand bits of 32 but number used to identify seperate nodes on the network

28
Q

the alloction of IP addresses to host within a network as well as allocation of networks themselves is done vi the amount of bits assigned to each

A
29
Q

how many IP addresses does IPv4 have

A

2^32

30
Q

how many IP addresses does IPv6 have

A

2^128

Computer Science Year 13 (2 decks)

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