Theory Flashcards
What are communication systems?
Electronic systems that transmit data from one location to another.
What are the two categories of communication channels?
Physical and Wireless Connections.
What are some examples of physical connections?
Twisted-pair cable.
Coaxial cable.
Fiber-optic cable.
What are the four basic components of a communication system?
Sending & Receiving devices.
Connection devices.
Communication channel.
Data Transmission Specifications.
What do communication channels do?
They carry data from one computer to another.
What are some examples of wireless connections?
Bluetooth.
Wi-Fi.
Microwave.
Satellite.
What is the most common connection device?
Modems, short for modulator-demodulator
What are the most commonly used modems?
Telephone modem.
DSL (digital subscriber line).
Cable Modem.
Wireless Modem.
What’s the main purpose of a modem?
It converts analog signals to digital signals and vice versa.
What are the 4 categories of bandwidth?
Voiceband.
Medium band.
Broadband.
Baseband.
What is bandwidth?
It is the measurement of the capacity of a communication channel.
What are some examples of protocols?
HTTP - hypertext transfer protocol.
https- hypertext transfer protocol secure
tcp - transmission control protocol
ip- internet protocol.
What is a protocol?
It is a set of communicational rules for the exchange of information between the computers in a network.
What is the intranet?
It is a private network within organizations.
What are some examples of network types?
Lan - Local Area Network
WLAN- Wireless Local Area Network
PAN - Personal Area Network
MAN - Metropolitan Area Network
WAN - Wide Area Network
What is a computer network?
It is a communication system that connects two or more computers to exchange information and share resources.
What types of topologies are there in network topologies?
Star topology.
Ring topology.
Mesh Topology.
What is the extranet?
It is a private network between organizations.
What are some examples of network securities?
Firewalls.
Intrusion Detection System (IDS)
Virtual Private Network (VPN)
What is a firewall?
It is a security system that protects an organization’s network against external threats.
What is an IDS?
It is a security system that works with firewalls to protect the network.
What information does one’s browser store without one being aware of it?
History files.
Cookies.
Temporary internet files.
What is online identity?
It is information that people voluntarily post about themselves online.
What are some major South African laws on privacy?
POPI Act
Personal Information Act.
What are some examples of malicious programs?
Viruses.
DDOS attacks.
Identity Theft.
Scams.
Cyberbullying.
What is security?
It is protecting individuals and organizations from theft and danger.
What are some measures to protect computer security?
Restricting Access and encrypting your data.
What are some examples of restricting access?
Security suites, Firewalls, and password managers.
What are some examples of encrypting data?
File Encryption.
E-mail encryption.
VPN.
Website encryption.
What are some ethics we should be aware of when using computers?
Copyright.
Piracy.
Plagiarism.
