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Domains of CISSP: Telecommunications and Network Security

In today’s global marketplace, the ability to communicate with others is a mandatory requirement. The Telecommunications and Network Security domain encompasses the network structure, transmission methods, transport formats, and security measures used to maintain the integrity, availability, authentication, and confidentiality of the transmitted information over both private and public communication networks.

The candidate is expected to demonstrate an understanding of communications and network security as it relates to voice communications; data communications in terms of local area, wide area, and remote access; Internet/Intranet/Extranet in terms of Firewalls, Routers, and TCP/IP; and communications security management and techniques in terms of preventive, detective, and corrective measures.

Key Areas of Knowledge

  • Establish secure data communications
  • Understand secure network architecture and design
    • OSI and TCP/IP models
    • IP networking
  • Secure network components
    • Hardware (e.g., modems, switches, routers)
    • Transmission media
    • Filtering devices (e.g., firewalls, proxies)
    • End-point security
  • Establish secure communication channels
    • Voice over IP (VoIP)
    • Multimedia collaboration (e.g., remote meeting technology, instant messaging)
    • Virtual private networks (VPN)
    • Remote access
  • Understand network attacks


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Mary is a leading trainer in Microsoft® and Business Applications.

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