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to global Internet access. As we move (b) Goals of network security
towards an information society, network Network security aims to protect not
security becomes more important, only the computers at both ends of
especially with the rise in cybercrime communication but also the entire Chapter Three: Advanced Computer Networks
and legal challenges. network. Whether an organisation is small
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or large, prioritising network security is
(a) Meaning of network security essential when using the Internet, LAN,

Network security protects networks and or other connectivity methods. The goals
their services from unauthorized access, of network security include maintaining:
modification, destruction, or disclosure. (i) Confidentiality: Protecting data,
It ensures that networks perform their objects, and resources from
critical functions correctly without unauthorised access or viewing.
harmful side effects. Network privacy, (ii) Integrity: Ensuring the accuracy
a part of network security, focuses on and consistency of data, preserving
protecting user, application, device, its reliability and preventing
and network data from unauthorized unauthorized alterations.
access. Most security issues are caused (iii) Availability: Ensuring that data,
by malicious individuals trying to gain network resources, or services are
something, get recognition, or harm consistently accessible to legitimate
others. users whenever needed.

(c) Network security measures
Network security uses multiple layers of protection, both at the network perimeter
and within its infrastructure. Each security layer implements specific strategies and
follows defined policies to limit access to network resources to authorized users
and prevent unauthorized activities. Effective network security involves checking
and protecting different parts of the network, making sure that all the equipment,
programs, and rules work together smoothly.

Physical Technical Administrative
layer layer layer

Figure 3.56: Security feature for networks

(i) Physical security networks
Physical security networks are designed to prevent unauthorised access to various
physical network devices, such as routers and cabling cabinets. Every institution
or organisation must also implement controlled access measures, such as locks and
biometric passwords, to ensure security.

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Student’s Book Form Five

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