Networks Flashcards
Define ‘Computer Network’
Computer Network is a set of computers connected together for the purpose of sharing resource.
What is the most common network generally
Internet
List 2 Advantages & Disadvantages of Networking
Advantages:
- Saves Money
- Files can easily be shared
- Data is easy to backup
- Quick/Easy/Free communications between users
Disadvantages:
- Purchasing one can be expensive
- Managing a large network can be complicated
- A single failure can make the whole network not function properly
- Viruses can spread easily
Define ‘Transmission Media’
Movement of data by upload or download is called transmission of data.
For the data to move it needs to go through the 2 methods what are they
Wired & Wireless
Copper Twisted/Ethernet: Wired or Wireless
Wired
Wi-Fi: Wired or Wireless
Wireless
Bluetooth: Wired or Wireless
Wireless
Optic Fibre: Wired or Wireless
Wired
Mobile Data: Wired or Wireless
Wireless
Define ‘Fibre Optic’ & Characteristics
Optic Fibre cabling has very long strands of glass (size of a hair) inside a cable. Data travels. inside the strands of glass as pulses of light.
- Very fast
- No interference
What does NBN stand for
National Broadband Network
What is FTTN & is it slow/medium/fast
Fibre to the node (Slowest)
What is FTTC & is it slow/medium/fast
Fibre to the curb (Medium)
What is FTTP & is it slow/medium/fast
Fibre Premises (Fastest)
List at least 2 characteristics of Wired Twisted Par
- Very commonly used in Network
- Copper Wiring
Not as fast at optic fibre
Much cheaper than fibre optic - Ethernet cables are UTD but they can transfer data very quickly (wont bottleneck a fibre connection)
- Cat6 (Latest Ethernet).
What is Wi-Fi
Uses radio waves, used for portable devices, -Device requires a wireless adaptor to receive wireless transmission
Pros of Wi-Fi
No wires needed = easy to connect to
Cons of Wi-Fi
Security Risks can be hacked
Prone to interference (microwave, walls, other signal).
What is Wi-Fi distance up to
20m
What is Wireless Bluetooth
Used for short distance connection
Cons of Wireless Bluetooth
Slow wireless connection
Very short range
Doesn’t require an established network/data/ISP (Internet Service Provider)
What is Wireless Bluetooth range
Up to 10m
What does the ‘G’ stand for in 1G, 2G, 3G, 4G, etc.
Generation of mobile technology
The speed of transmission are measured in what
measured in megabits per second (bps)
Transmission Rates of Wired Connection are
-Other clients online cable speed greatly reduced by more clients online
-Twisted Pair = Slight interference from other wires
What are the transmission rates, advantages & disadvantages
- Range = if close = transmit faster
- Concrete walls, doors = slows or stops the connection
- Interference from microwaves ovens, other electrical devices
- Wireless speed gravity reduced by more clients online
List all the 7 Network Components
- Server
- Modem
- Router
- NIC
- Switch
- WAP
- Topologies
Define ‘Server’
The purpose of a server is managed network resources
Define ‘Modem’
Stands for Modulation & Demodulation, creates the connection to the internet this means it converts analogue signals to digital signals
Define ‘Router’
Routers connect multiple networks together (LAN to Internet) they take info that arrives to your modem, decipher it, & deliver it to the device on your network
Define ‘NIC’
A network interface card, is used to connect a computer to a network your computer needs one to communicate to another device
Define ‘Switch’
A device that connects devices together on a computer network (Wired Connection)
Define ‘WAP’
Stands for wireless access point, provides a wireless network connection to devices
What 2 frequencies can WAP be transmitted as
- 2.4 = further distance, slower speed
- 5GHz less range, faster Wi-Fi speeds
Define ‘Topologies’
- Is the structure of the network
- 2 structures wired & wireless
What is a star
Has a central point, this is a wired connection from the Switch to other devices, with the help of Ethernet Cables
List the advantages of a star
- Improved performances (passes through lower nodes
- Centralised management of devices if a central server is used
- Easy to connect new devices
- Failure at one node does not affect the rest of the network (If laptop fails the other devices will still work)
List the disadvantages of a star
- If central computer fails, entire network is useless
- Central computer could be communications bottleneck - Expensive to set up
- Expensive to set up
Wireless Topologies?
To do this a wireless adaptor on your device & a wireless access point
What is meant by Client Server Vs. Peer to Peer
Describes a particular networking architecture
Define ‘Client Server’
The central computer is a server (Client Server) . All the other computers connected to it are called clients
List the advantages & disadvantages of Client Server
Advantage:
- Offers greater security than PTP (because of the central server)
Disadvantage:
- More expensive to set up than PTP as server hardware and software is expensive
Define ‘Peer To Peer’
PTP networks do not have a central server to manage network resources. Resources are distributed between the various peers that make up their network
List the Advantages & Disadvantages of Peer to Peer
Advantage:
- PTP network are cheap & easy to set up
Disadvantage:
- Less secure then client server networks (because there is no central server to manage security)
True Or False: A computer needs an NIC to communicate to another device
True
Dial - Up Speed is
56 kbps
ADSL/Cable speed is
512 Kbps- 2Mbps
Satellite speed is
512 Kbps(remote)
ADSL2 speed is
Max 24Mbps
Optic Fiber Speed is
100 mbps (but only with no copper wires in the system anywhere)
