Topic 4: Networks Flashcards
Standalone computer
A computer that is not connected to a network
Network
An arrangement of two or more computers that are connected together for the purpose of sharing resources and data
Internet of Things (loT)
A network of physical objects that use sensors, actuators, embedded systems and wireless technology such as WiFi and bluetooth to collect and exchange data with no human interacion
VoIP
Voice internet protocol
LAN
Local Area Network
- School network
WAN
Wide Area Network
-Bank / hotel chain network
WLAN
Wireless Local Area Netwrok
- Hand held scanners
Server
A computer connceted to a network used to coordinate (store and share) huge amounts of data
Latency
The time it takes for a message to transfer (ms). AkA ping
Internet
- An interconnected network or network of networks.
- Most networks are part of the internet.
- Consists of multiple cables or links that connect countries together, and can be though of as the backbone.
Packet switching
- Breaking down a large amount of data into small packets, each packet is independent from one another
- Each packet is tagged with:
- Source address
- Destination address
- Sequence number of the packet
- total number of packets being sent
Router
Manages communication on the network. Can have a built-in wireless access point (WAP)
TCP
- Transmission Control Protocol
- Responsible for delivering data to a given address
Modem
Modulator / Demodulator
HTTP
Hyper Text Transfer Protocol
SMTP
Simple Mail Transfer Protocol
Network topology
A Network topology is the arrangement with which computer systems or network deveices are connected to each other
Bus topology
In a bus topology, all nodes in the network are connected directly to a central cable that runs up and down the network
Ring topology
Each node is connected with two other deveices
Star typology
All nodes indirectly connect to each other through 1 or more switches. The switch acts as a central point through which all communications are passed.
Mesh topology
There is no central connection point. Instead each node is connected to at least one other node
Avantages of bus topology
- Easy to install
-Cheap to install
Disadvantages of bus topology
-If the central cable fails the whole networks fails and stops working
Advantages of Ring topology
- No data collisions, as the data only flows in one directions
Disadvantages of ring topology
If the main cable fails, the network fails
Advantages of star topolgy
- If a cable fails, the whole network will not fail and other computers can still work
- High performance as there are no data collisions
Disadvantages of star topology
- It is expensive to build as it requires more hardware such as switches and wires
Advantages of mesh topology
- Manages a large amount of data as computers can trasnmit data simultaneously
- If a cable fails, the network still works
Disadvantages of mesh topology
-It is expensive to build
- It requires much more time to repair or build
IP
- Internet protocol
- Responsible for obtaining the address to which data is sent.
- A set of rules that govern data transfer in the internet
TCP/IP
- Layered protocol stack
- Collection of protocols
- It sets how data should be formatted and transmitted across networks
Web Server
Holds and shares web pages
File server
Holds and maintains user files
Mail server
Handles emails between users
Network speed
File size / time
