The Internet

Question 1

What is the internet ?

Answer 1

Network of interconnected computers that use an end to end communication protocol

Question 2

Protocal?

Answer 2

Set of rules that allows for communication of devices

Question 3

Internet service providers?

Answer 3

Company that provides customers with internet , and national service providers provide internet for national companies

Question 4

What is a packet and what is included inside them?

Answer 4

Bundle of data which is transmitted over a network.
They contain an address for the sender and recipient and inside the packet it contain information intended for the recipient.

Question 5

How does packet switching work?

Answer 5

Data is sent in packets.
Data is split into smaller packets each of which is sent to the recipient via the best route.
Reassembled with other packets by its recipient.

Question 6

What happens when a packet sent through a network?

Answer 6

Packets are said to take a number of routes before reaching its destination.

Question 7

What is the role of the router in packet switching?

Answer 7

Uses the packets address to determine where to send the packet, each time a packet passes a router it said that a hop occurs.

Question 8

What is a packets time to live?

Answer 8

Packets have a finite hops , so TTL is a number that indicates how many hops the packet can have and each time it hops it minus the hop value by one.

Question 9

What happens when TTL expires?

Answer 9

The packet is dropped (deleted) , the recipient (receiver) will notice the missing packet and will request for sender to send the missing packet.

Question 10

Senders address?

Answer 10

Identifies where packet was sent from ; and where it should be sent to.

Question 11

Receivers address?

Answer 11

Shows the packets intended recipient and this allows it to be forwarded TO THE CORRECT DEVICE.

Question 12

SEQUENCE NUMBER?

Answer 12

Contains no. Of packets in a message and shows the position in relation to others.
Also reassembles packets in correct order and allows missing packets to be identified.

Question 13

Purpose of routers and gateways?

Answer 13

Connect different networks and allow packets to reach their destination.

Question 14

What is the main function of routers(ADS)

Answer 14

They send packets to destination via the shortest route possible whether it is the least no. Of hops or the least congested path.

Question 15

Role of gateways?

Answer 15

Strip away most of packets details and leaving with just the packets contents.
Gateways gives a new sender and receiver addresses.

Question 16

What is uniform resource locators?

Answer 16

Address assigned to files on the internet.

Question 17

HTTPS:// ?

Answer 17

Hypertext transfer protocol secure .
Protocol being used to a access file.

Question 18

Www ?

Answer 18

World Wide Web
Points to the server hosted at the following domain.

Question 19

BBC.co.uk ?

Answer 19

Domain.
BBC is the name of the organisation
.uk is a top level domain
.co is a second level domain.

Question 20

/news ?

Answer 20

Directory of file being requested

Question 21

What are domain names?

Answer 21

Identifies an organisation or an individual on the internet.

Question 22

FDQN?

Answer 22

FULLY QUALIFIED DOMAIN NAME
Will always include the servers host name and specifies the exact resource and is interpreted only in one way.

Question 23

Vaguely explain how IP addresses are incorporated in the internet?

Answer 23

They assigned to every computer on the internet.
The are basically the exact same as domain names only that IP addresses are not user friendly.

Question 24

What ARE DNS used for?

Answer 24

Translates the domain name into its corresponding IP address.

Question 25

What happens if DNS does not have a record of the domain

Answer 25

Request will be passed to another domain name server. That y some unknown apps are slower than large websites

Question 26

What is the purpose of a domain name server on the internet?

Answer 26

To translate domain names into IP addresses.

Question 27

2 roles of routers

Answer 27

Manage congestion Route packets according to destruction IP address. ‘

Question 28

What is packet switching

Answer 28

Messenger sprit into packets, where each packet is given a source + destination address.

Question 29

Why must the port no. Be well known?

Answer 29

Clients must know which port no. To connect to. Communication initiated by cells

Question 30

What is the purpose of a gateway

Answer 30

To connect network using different protocols

Question 31

explain why browsing the internet might be slower at a public hotspot in a coffee shop than at home on a wireless network.

Answer 31

In coffee shop there are may be more collisions .
In coffee shop there may be collisions.