Networks

Question 1

What is a network protocol?

Answer 1

A set of rules that governs the transmission of data.

Question 2

HTTP

Answer 2

Hyper Text Transfer Protocol - The fetching of web pages from the web server

Question 3

What is HTTPS

Answer 3

Secure HTTP - encrypts the data so that it can not be intercepted

Question 4

Which types of companies would be better suited to use HTTP?

Answer 4

Banks, schools, any website that collects personal information.

Question 5

FTP

Answer 5

File Transfer Protocol - used for sending or receiving files.

Question 6

SMTP

Answer 6

Simple Mail Transfer Protocol - when an email is sent , it goes to a mail server via the SMTP protocol, and is then forwarded to other servers

Question 7

POP

Answer 7

Post Office Protocol - the message is downloaded to the recipient’s local device and is deleted from the server

Question 8

IMAP

Answer 8

Internet Message Access Protocol - The message is left on the server, so that it can be accessed on multiple devices. It is only deleted from the server when the user manually deletes them.

Question 9

TCP

Answer 9

Transmission Control Protocol - the message is broken up into packets, and each packet is sent by the fastest route to the recipient, where it is reassembled and any errors are checked.

Question 10

IP

Answer 10

Internet Protocol - The geographical location of a device, and which routes the individual packets

Question 11

UDP

Answer 11

User Datagram Protocol - maintains an open data connection where packets are sent without checking for errors, and is used when it doesn’t make sense to wait

Question 12

When can UDP be used

Answer 12

Video streaming, video games

Question 13

TCP/IP Stack

Answer 13

Four layers of network functionality

Question 14

What are the four layers of the TCP/IP Stack

Answer 14

Application
Transport
Internet
Link

Question 15

What is a packet

Answer 15

A section of a broken up file which is being sent across the internet

Question 16

What metadata does a packet contain

Answer 16

The IP address of the sender and receiver
The order number of the file
The total number of packets which make up that file
Error checking data

Question 17

How large is one packet

Answer 17

512 megabytes

Question 18

What is a computer network

Answer 18

A group of computers linked together to allow communication and the sharing of resources

Question 19

WAN

Answer 19

Wide area Network

Question 20

Who owns a WAN

Answer 20

No-one - a collection of computers and networks connected using resources supplied by a third party carrier

Question 21

What is a router

Answer 21

A router routes data packets across a WAN

Question 22

What is a switch

Answer 22

A component of a LAN which sends packets to the specific device in a network using their MAC address

Question 23

NIC

Answer 23

Network Interface Card - required in a device for it to connect to a network

Question 24

MAC address

Answer 24

Media Access Control address - the unique identifier of a device which allows data to be sent to it

Question 25

Advantages of wireless networks

Answer 25

Allows free movement of users
Allows file sharing
Reduces cabling and hardware costs
Easier to add new devices

Question 26

Disadvantages of wireless networks

Answer 26

Less secure and easier to hack into
File transfer speeds are slower
Can be obstructed by walls and objects

Question 27

LAN

Answer 27

Local Area Network - covers a small geographical area and usually owned by an organisation or person

Question 28

What are the two network topologies

Answer 28

Star and Bus topologies