Topic 2 of 8 · Form 3
Data transmission, the internet and cyber security
Packets (header with destination and source addresses, packet number; payload; trailer with error check) and packet switching via routers.
Notes for this topic 1 file, in order
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Data transmission
Packets (header with destination and source addresses, packet number; payload; trailer with error check) and packet switching via routers.
- Serial and parallel; simplex, half-duplex and full-duplex transmission.
- USB as a common interface.
- Error detection: parity checks (odd/even), checksums, echo checks, automatic repeat requests (ARQ) and check digits.
- Encryption: symmetric and asymmetric.
The internet and the World Wide Web
The internet is the global network infrastructure; the WWW is the collection of websites accessed over it. URLs, HTTP and HTTPS, web browsers, DNS, cookies (session and persistent).
Digital currency and blockchain (introduction)
Cyber security threats
Brute-force attacks, data interception, distributed denial of service (DDoS), hacking, malware (viruses, worms, Trojan horses, spyware, adware, ransomware), phishing, pharming and social engineering.
Protection
Access levels, anti-malware, authentication (passwords, biometrics, two-step verification), automating software updates, checking spelling and URLs of messages, firewalls, privacy settings, proxy servers and SSL.
Check yourself
- What is the purpose of a parity bit?
- Distinguish between the internet and the World Wide Web.
- How does a firewall protect a network?
Show answers
- To detect errors in transmitted data by checking the number of 1s.
- The internet is the network infrastructure; the WWW is the collection of web pages accessed over it.
- It monitors incoming and outgoing traffic and blocks data that does not meet set rules.
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