Your computer needs to communicate to a network server or an internet service provider (ISP) by telephone lines, mobile phone connections (3G or 4G), digital subscriber line (DSL) or cable internet, wired to a router (or wireless router). You will learn how networks operate and distinguish between wired and wireless networks by reviewing the hardware and protocols used in each network type.

Within the topic of networks, sharing files and peripherals, we move to the topic of the internet – which in itself is a network – and explore the terminology, the benefits, various types of network connections and protocols (Figure 4.19 page 107 in your textbook). Most networks communicate using TCP/IP (Transmission Control Protocol/Internet Protocol) which governs how data is transmitted and received on a network. To connect to the internet, you will need an IP address (a numeric code used to identify your device). There are different types of IP addresses (IPv4 and IPv6) which look very different from each other – IPv6 will be replacing IPv4 as IPv4 numbers are nearly running out and IPv6 has a much larger number of digital combinations.

In this lesson we learn to understand secure data access, data ownership and secure online data. You will learn what network and PC threats there are, how to identify and defend against the various types of Cyber Crime – phishing, pharming, clickjacking and malicious scripts, which will be discussed in greater detail in the next lesson, Lesson 5 Troubleshooting and Maintenance.


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