Network and Security Foundations C172 2026 – 120 Key Concepts on OSI, TCP/IP, Wireless Standards & Cyber Attacks

This document contains approximately 120 high-priority review questions and answers for Network and Security Foundations C172 Final Objective Assessment (2026), covering essential networking models, wireless standards, port classifications, attack types, and network infrastructure components . The material begins with wireless standards (802.11a/b/g/n/ac), frequency bands (2.4GHz vs 5GHz), transmission speeds, and channel overlap rules, including DSSS channel counts and non-overlapping channels in the U.S. It also reviews private IP address ranges (10.x.x.x, 172.16–172.32.x.x, 192.168.x.x), well-known vs registered vs private TCP/UDP ports, and cable standards (Cat5, Cat5e, Cat6, Cat6a bandwidth and speed capacities). The document provides a structured breakdown of the OSI model (Layers 1–7) and TCP/IP model mapping, including functions and protocol examples at each layer such as HTTP, FTP, SMTP (Application), TCP/UDP (Transport), IP (Network), and MAC addressing (Data Link). It also covers storage technologies (SAN vs NAS), hardware security modules (HSM), proxy server functionality, and network interface fundamentals. Cybersecurity threat coverage includes social engineering, password cracking (dictionary and brute-force attacks), packet sniffing, man-in-the-middle (MITM), ARP cache poisoning, evil twin attacks, session hijacking, buffer overflow, zero-day attacks, denial-of-service (DoS) and permanent DoS (PDoS), and wiretapping exploits. Each concept is presented in concise Q&A format to reinforce terminology recognition and objective assessment recall. The content aligns with foundational networking and cybersecurity coursework, making it highly suitable for students preparing for WGU C172 Final Objective Assessment, CompTIA Network+, and entry-level cybersecurity certification exams. The structured review format strengthens conceptual clarity, protocol identification, security attack recognition, and exam-readiness memorization strategies. This document may concern: • Network and Security Foundations C172 • Introduction to Networking • Cybersecurity Fundamentals • CompTIA Network+ Preparation • IT Infrastructure Basics • Information Security Foundations It is particularly relevant for: • IT students • Cybersecurity students • Network administration students • Help desk technicians • Entry-level security analysts • Certification candidates Keywords: network security foundations C172 2026, 802.11a b g n ac speeds, 2.4GHz vs 5GHz wireless, OSI model layers 1 to 7, TCP IP model mapping, well known ports 1 to 1023, registered ports 1024 to 49151, private ports 49152 to 65535, private IP address ranges , ARP cache poisoning attack, man in the middle MITM attack, evil twin wireless attack, buffer overflow exploit, zero day vulnerability, denial of service DoS PDoS, CAT5 CAT6 CAT6a bandwidth, SAN vs NAS storage difference, hardware security module HSM, proxy server authentication, packet sniffing network security