Explain cyber security at network and application layer of a typical IT system in detail.

Cybersecurity is an essential component of modern IT systems, particularly in the context of network and application layers, which are the two key elements of a typical IT infrastructure vulnerable to cyber attacks. As businesses and organizations increasingly rely on digital platforms and services, the need to protect sensitive data and maintain the integrity and availability of these systems becomes paramount. In this context, cybersecurity refers to the practice of protecting computers, servers, networks, and data from malicious activities and unauthorized access.

Network Layer Security

The network layer in the OSI (Open Systems Interconnection) model is responsible for the transmission of data packets between devices across a network. It defines the protocols and the structure of data packets to ensure reliable communication between various systems. At this level, cybersecurity focuses on safeguarding the infrastructure that facilitates data transmission. The primary goal is to ensure that data flows securely between devices, preventing unauthorized interception or tampering.

Key techniques used to secure the network layer include:

1. Firewalls: Firewalls act as barriers between internal networks and external networks, filtering incoming and outgoing traffic based on predetermined security rules. These rules determine which types of traffic are allowed or blocked based on factors such as IP addresses, ports, and protocols. Firewalls play a critical role in network ______ _____ ______ _________ ________ _____ _______ ___.
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