Definition
Communication and Network Security refers to the principles and practices used to protect the integrity, confidentiality, and availability of data transmitted across networks. It involves implementing security controls at various layers of the network stack, from physical connections to application protocols. This domain is crucial for safeguarding sensitive information from unauthorized access, modification, or denial of service. For instance, configuring firewalls to filter malicious traffic and encrypting data in transit using protocols like TLS are core components. Unlike physical security which focuses on tangible assets, communication and network security addresses the flow of digital information. Understanding these concepts is essential for roles covered by certifications like CompTIA Security+, CySA+, and CISSP.