1.3.3 Networks Pt1

Question 1

Network

Answer 1

Two or more devices connected together with the ability to transfer data between each other

Question 2

Network advantages

Answer 2

Allow for collaboration
Access information quicker
Allows for sharing resources
Allows streaming

Question 3

Network disadvantages

Answer 3

Relies on connectivity/internet access
We can become dependent
Expensive to maintain

Question 4

LAN

Answer 4

Local Area Network

A network where devices are geographically close to each other

Question 5

WAN

Answer 5

Wide Area Network

A network where devices are connected across a large geographical area

Question 6

MAN

Answer 6

Metropolitan Area Network

A network across one metropolitan area such as a city

Question 7

PAN

Answer 7

Personal Area Network

A network centred around one person’s workspace with connected devices

Question 8

SAN

Answer 8

Storage Area Network

A network dedicated to sharing data across devices

Question 9

WPAN

Answer 9

Wireless Personal Area Network

A personal network which is not connected by wires

Question 10

VPN

Answer 10

Virtual Private Network

A network which allows users to access a private network from another location

Question 11

Coaxial copper cables

Answer 11

Single copper cables that need to be replaced from time to time as the insulation may degrade

Question 12

Unshielded Twisted Pair (UTP)

Answer 12

Two copper cables twisted around each other

Question 13

Shielded Twisted Pair

Answer 13

Two copper cables twisted around each other with metal shielding to reduce interference

Question 14

Copper wire advantages

Answer 14

Cheap to install, can directly power telephones

Question 15

Copper wire disadvantages

Answer 15

Lower bandwidth, short lifetime

Question 16

Fibre-optic cables

Answer 16

Glass cables that use total internal reflection to transmit light signals

Question 17

Fibre optic cables advantages

Answer 17

Long lifetime, less electromagnetic interference, higher bandwidth

Question 18

Fibre optic cable disadvantages

Answer 18

Expensive to install

Question 19

Bus topology

Answer 19

A single backbone cable with passive nodes attached, there are two terminators at either end. Packets are sent to all nodes

Question 20

Bus Topology Advantages and Disadvantages

Answer 20

+ easy and cheap

- slow, less secure, if the main cable fails it all fails

Question 21

Ring Topology

Answer 21

All devices are connected in a closed loop, packets go in one direction through each device. A receiver sends an acknowledgment to the sender when a packet is received

Question 22

Ring Topology Advantages and Disadvantages

Answer 22

+ less data collisions

- if one cable fails the whole network fails, less secure, hard to add new nodes

Question 23

Star Topology

Answer 23

Used in LAN networks, each device is connected to a hub by a cable

Question 24

Star Topology Advantages and Disadvantages

Answer 24

+ Fast, a cable failing only impacts the data through it

- expensive to install, the central hub failing fails the whole network

Question 25

Full Mesh Topology

Answer 25

All devices are connected to each other and can send messages directly

Question 26

Partial Mesh Topology

Answer 26

A device is connected to all other devices but some devices may be connected in a different topology

Question 27

Mesh Topology Advantages and Disadvantages

Answer 27

+ fast, data is re-routed if a cable breaks “self healing” | - expensive, difficult to maintain, impractical for wired networks

Question 28

Network Interface Card (NIC)

Answer 28

Converts data signals from a device to ones that can be transferred across a network

Question 29

Router

Answer 29

Forwards data packets between computer networks Works by inspecting the destination IP address of the packet, changing the source MAC address to be its and the destination to be that of the next router

Question 30

Gateway

Answer 30

Connects two networks that use different protocols

Question 31

Modem

Answer 31

Converts data from digital formats into electrical signals

Question 32

Hub

Answer 32

Broadcasts data from a device to all devices on its network

Question 33

Switches

Answer 33

Filter data packets and forward to a specific device

Question 34

Bridge

Answer 34

Connects two separate LAN networks together

Question 35

Wireless Access Point

Answer 35

A network hardware that allows wireless-specific devices to connect to a wired network

Question 36

Physical Topology

Answer 36

Defines how the devices are physically connected

Question 37

Logical Topology

Answer 37

Defines how the devices communicate across the physical topologies

Question 38

SSID

Answer 38

A 32-character locally unique code that identifies a network in Wi-Fi

Question 39

WPA2

Answer 39

A protocol that encrypts data and ensures security on Wi-Fi networks

Question 40

DHCP

Answer 40

Dynamic Host Control Protocol | A protocol that allocates locally unique IP addresses to devices as they connect to a network

Question 41

VoIP

Answer 41

A protocol that allows us to make voice calls over the internet