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1.2 Communication and internet technologies (1.2.1 Data transmission (3…
1.2 Communication and internet technologies
1.2.1 Data transmission
2 types of signals
Analogue signals
Digital signals
2 transmission types
serial data transmission
parallel data transmission
3 communication types
half duplex (walkie talkie)
full duplex (telephone)
simplex (keyboard)
3 types of cables
fibre optic cable
coaxial cable
twisted pair cable
1.2.2 Security aspects
Firewall
Controls data traffic
Host based firewall
Both sides (to and from)
Admin Control List (ACL)
control protocols
TCP, Transmission control protocol
UDP, User datagram protocol
IP, internet protocol
http - ports
smtp, simple mail transfer protocol
ssl, tls protocols
https - ports
blocking emails
Threats/Risks/Dangers
Virus
Infects other programs
Worm
Copying itself (doesn't infect other programs)
Logic Bomb
Inserted into a software and set off a malicious act when certain condition are met
Rootkit
Changes your operating systems
Spyware
Collect information about the user without their knowledge
Keylogger
Spying what the user types
Trojan Horse
Ransomware
Block screens with a false accusation
Adware
Presents unwanted advertising
stealing personal information
1.2.3 Internet principles of operation
URL
Uniform Resource Locator
There are 3 parts in a URL
Protokol
http
hyper-text transfer protocol
https
hyper-text transfer protocol secure
Domain
.com, .gov, .k12 etc
example: facebook.com
Location
index.html, contact.html. about.htm, products.html etc
https://www.paypal.com/index.html
https://www.lis.school/index.html
https://www.instergram.com
ISP
MAC Address
Cookie