Computer Networking and Telecommunication Flashcards
Telecommunication
Tele: Long Distance
Communication: Sharing of Ideas, Views, Information with other individuals or machine
Basic Elements of a Communication System
- Sender
- Receiver
- Medium
- Data-Instructions/Information
- Protocol Rules
Data Transmission Modes
Simplex: 1 way
Half Duplex: 2 way, 1 at a time
Duplex: 2 way, Simultaneous
BITS
Binary Digits
Smallest Unit of measurement of a data
Bandwidth
Range of frequency available for transmission
[amount of data that can travel through medium]
bits per second (bps, kbps)
Computer Network Services
- File: Transfer, Storage and Migration of files and data
- Print: Sharing of printing device
- Message: Sharing messages like emails, voice mails and instant messaging
- Application: Sharing of application programs
- Database: Distributing data that main server holds to users
Advantages of Computer Networking
- Hardware Sharing
- Software Sharing
- Sharing Remote Database( (reservations of tickets, bank balance, money transfer}
- Communication
- Cost Effective
Disadvantages of Computer Networking
Virus Transfer Less Secure (data) Less Reliable (one computers disfunction affects everyone)
Elements of Network
Server
Workstation
Network Interference Card
Communication Channel / Transmission Media
Types of Server with differences
Non Dedicated can be used as workstation they are usually normal computers windows NT, Advanced 200 Dedicated can not be used as workstation they are usually powerful computers Novell NETWARE
What are File, Print and Modem Server
File server is a server responsible for the storage and management of data files so that other computers on the same network can access the files.
Print server is a server that takes care of printing requirements of workstations.
Modem server allows network to use a MEDEM to transmit long distance messages through internet
Workstation
Computers attached to a network and using the resources of the network
Communication Channels/ Transmission Media (+ types)
The physical channels of pathways through which data travels
guided communication media
unguided communication
Guided Communication Media (eg.)
where data are restricted to travel in physical wire bounded / guided twisted (shielded + unshielded) co-axial fiber optics
Unguided Media Transmission
Data doesnt travel in a closed path unbounded/unguided radio wave micro wave satellite infrared bluetooth
Elements of Network (10)
Network Interference Card Connectors Hub Bridge Switch Router Gateway Repeater Modem Multiplexer
Network Interference Card
Hardware that act as an interference between networking cable and the computer.
Each has unique identity number; node address
Connectors
Interference between media (wire) and computer
RJ-45
BNC
ST
Hub
Device that broadcasts data/network to every device connected to it
Bridge
It is a device used to join two similar types of networks or LAN
Switch
Used to connect more than one different networks.
Router
It connects similar and dissimilar networks + determines the best path for sending data to reciever
Gateway
Connect two types of dissimilar types of network.
It can modify data to connect networks and sometimes rewrite data into new
It also acts a firewall.
Repeater
Increases length of network by amplifying weak signals
