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Networking Models, Ports, and Applications

May 24, 2026

Study ISC2 CC networking basics: OSI model, TCP/IP, IPv4, IPv6, Wi-Fi, ports, protocols, and applications.

On this page

CC does not require deep network engineering, but you should understand enough to recognize where a control belongs and why ports, protocols, and layers matter.

Models in plain language

Concept What to remember
OSI model layer-based way to reason about networking functions
TCP/IP model practical internet protocol stack
IPv4 / IPv6 addressing systems used to identify hosts
Wi-Fi wireless networking with authentication and encryption concerns
Port logical service number used by applications
Application service or protocol users interact with or systems expose

Why ports matter

An open port can expose a service. The exam may not require port-number memorization beyond common awareness, but it does expect the idea: unnecessary exposed services increase attack surface.

Exam traps

  • Blocking a port may reduce exposure, but it does not fix weak authentication.
  • Encryption in transit protects confidentiality and integrity of traffic, but not necessarily endpoint compromise.
  • Wireless security needs authentication and encryption, not just a hidden network name.
Revised on Monday, June 15, 2026
Threats and Attacks