Networking

Question 2

to enable a device to access any type of network they will need a …….

Answer 2

network interface card (NIC)

Question 3

what are the two main types of networks

Answer 3

• local area network (LAN)
• wide area network (WAN)

Question 4

explain what a LAN is

Answer 4

network thats confined to relatively small areas such as a building

Question 5

explain what a WAN is

Answer 5

network that spans a large area such as possible several continents

Question 6

give 3 advantages of a LAN

Answer 6

• enhanced security
• low error rate
• higher transmission rates
• cost effective
• reliable

Question 7

give 2 advantages of a WAN

Answer 7

• wider coverage
• highly scalabale

Question 8

explain a star network toplogy

Answer 8

consists of a central computer to which all other devices are attached to

Question 9

give 2 advantages of a star toplogy

Answer 9

• easier to maintain
• access files on all computers
• high speed

Question 10

give 2 disadvantages of a star toplogy

Answer 10

• if main computer breaks then this affects all other devices
• requires more cabling
• limited number of connections

Question 11

explain a bus network topology

Answer 11

single length of transmission cable onto which various devices are attached

Question 12

give 2 advantages of a bus topology

Answer 12

• simple layout - not as much cabling is needed
• easy to extend

Question 13

give 2 disadvantages of a bus topology

Answer 13

• if main cable breaks then entire network is affected
• hard to find where fault is
• less secure
• collisions more likely

Question 14

what does physical topology mean

Answer 14

the actual layout and connection of the cables

Question 15

what does logical topology mean

Answer 15

the way data is transmitted around a network

Question 16

explain what a client server network is

Answer 16

computer uses resources housed inside a central server

Question 17

explain what a thin client is

Answer 17

all processing done on central server

Question 18

explain what a thick client is

Answer 18

powerful pcs connected to a network where all processing is done on the pc

Question 19

explain what a peer to peer network is

Answer 19

two or more computers connect and share resources

Question 20

give 3 advantages of a wireless network

Answer 20

• no cabling required
• can handle large number of users
• user can move around freely

Question 21

give 3 disadvantanges of a wireless network

Answer 21

• slower speeds
• connections become weaker further away u are
• signal can be easily obstructed
• less secure

Question 22

what is an SSID

Answer 22

the way a wireless network can be identified

Question 23

what is a mac address

Answer 23

uniquely identifies a unique device

Question 24

explain CSMA/CA without RTS/CTS in a flow diagram format

Answer 24

CSMA/CA without RT/CTS

Question 25

explain CSMA/CA with RTS/CTS

Answer 25

* assemble a frame * check if channel is idle * if not it will wait * if idle than a request to send is sent * a clear to send is then sent * if clear to send is no then wait * if clear to send is yes then transmit data

Question 26

why is a wireless signal less secure than a wired network

Answer 26

signal is easier to intercept

Question 27

give 3 ways to enhance security of a wireless network

Answer 27

* change SSID and hide it from transmission * ensure all devices are WPA/WPA2 * create a list of mac addresses from devices you know to be trustworthy

Question 28

explain how encytping data with WPA/WPA2, disabling SSID broadcasting and mac address whitelisting could enhance the security of a wireless network

Answer 28

* WPA = encyrpts data do reduces chance of unwanted devices to be able to read data * mac address = only trusted devices will be able to join network * SSID = disabling it means it wont show in a search

Question 29

explain the process the receiving device does when receiving data | majority voting

Answer 29

* the transmitting device would send each bit an odd number of times * the receiver checks the bits and assumes the one it receives the most copies of is the correct value

Question 30

Explain the operation of a logical bus network topology

Answer 30

* node broadcasts data to the entire network * all nodes recieve the data * a node examins the recieved data to check if it the intended recipient

Question 31

explain two reasons why a thin client system might be chosen in preference to a thick client system

Answer 31

* cheaper * simpler to update software