computer networks

Question 1

what is the internet

Answer 1

a global system of interconnected computer networks

Question 2

what does the internet facilitate

Answer 2

wide range of services:
world wide web
email
internet
telephony
file sharing

Question 3

what does DNS stand for

Answer 3

domain name server

Question 4

what does the DNS do

Answer 4

converts DOMAIN NAMES to the IP ADDRESSES needed to located resources on the internet

Question 5

what is the domain name converted into

Answer 5

IP addresses

Question 6

why are domain names converted into IP addresses

Answer 6

IP addresses are needed to located resources on the internet

Question 7

what is an IP address

Answer 7

a string of 32 binary digits

Question 8

what is an IP address split into

Answer 8

four 8 bit chunks

Question 9

what are the sections of the IP address converted into

Answer 9

each octet is converted into denary

Question 10

how is an IP address written

Answer 10

the four denary values are then written with a dot between them
eg. 120.16.130.210

Question 11

what could an IP address also be called

Answer 11

dotted decimal notation

Question 12

how to domain names and IP addresses link

Answer 12

domain names are user-friendly names that save us from having to remember IP addresses

Question 13

why do we use domain names instead of IP addresses

Answer 13

we don’t have to remember IP addresses

Question 14

what is the link between a domain name and IP addresses

Answer 14

DNS

Question 15

what is a DNS a link between

Answer 15

between domain names and IP addresses

Question 16

what is a router

Answer 16

a networking device that forwards data packets between computer networks

Question 17

what does a router do

Answer 17

forwards data packets between computer networks (connects networks)

Question 18

what is a gateway

Answer 18

a device that is used to allow the transmission of data between dissimilar networks
eg. networks that use different protocols

Question 19

what can a gateway combine

Answer 19

a variety of operations
eg malware inspection and spam filtering

Question 20

what combines a variety of operations

Answer 20

a gateway

Question 21

what does ISP stand for

Answer 21

internet service provider

Question 22

what does NIC stand for

Answer 22

network interface controller

Question 23

what is a NIC

Answer 23

a hardware device that is used to connect a device to a network

Question 24

what does a NIC do

Answer 24

converts DATA that is sent, into appropriate SIGNALS that can be carried across the medium

Question 25

what signals can be sent through a wired network

Answer 25

voltages through a wire pulses of light through a fibre

Question 26

what signals can be sent through a wireless network

Answer 26

modulated radio waves

Question 27

what medium is 'voltages through a wire' passed through

Answer 27

wired network

Question 28

what medium is 'pulses of light through a fibre' passed through

Answer 28

wired network

Question 29

what medium is 'modulated radio waves' passed through

Answer 29

wireless network

Question 30

what is the difference between a router and a gateway

Answer 30

router - connects similar networks and directs traffic between them gateway - acts as a translation point between different networks, handling different protocols

Question 31

what is the difference between the internet and the WWW

Answer 31

internet - global network connecting computers WWW - service on the internet, a system of linked hypertext pages