LESSON 9 FOR INTRODUCTION TO COMPUTERS 1 NETWORK SECURITY AND PRIVACY
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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