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ISC2 CISSP 2024 outline · Domain 4: Communication & network security

Network components: firewalls, IDS/IPS, NAC, proxies, transmission media, endpoint security

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Last reviewed September 30, 2026 · Leer en español

Network components are the building blocks of network defense. The exam expects you to know what each component can see, where it belongs and how it differs from its neighbors, so you can pick the right one for a scenario. A useful habit is to ask two questions about any device: at which layer does it make decisions, and does it only watch or can it also block?

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