Free Network+ Practice Test — 20 Questions, Real Exam Style
Free Network+ N10-009 practice test — 20 questions, same style and difficulty as the real exam. Click to reveal each answer with a full explanation. No email …
Posts tagged: Networking
Network+ Ports Cheat Sheet — All 30 Worth Memorizing on One Page
The Network+ N10-009 exam tests roughly 30 ports — not 100. Port number, protocol, TCP or UDP, what it does. One page, free, exam-ready.
Subnetting Quick Reference — The 60-Second Method on One Page
Subnetting on one page — the 60-second method, the magic-number table, /29 walkthrough, and the prefix-to-mask conversion chart. Print it. Use it. No tables to …
Port Numbers Worth Memorizing for Network+ (and Which Ones You Can Skip)
Network+ port-number memorization is a slog. Here's the ranked list — must-memorize, nice-to-know, and safely-skip — based on what the N10-009 actually tests.
OSI vs TCP/IP Layer Mapping — A Cheat Sheet for the N10-009 Exam
OSI 7-layer model mapped to the TCP/IP 4-layer model with every protocol, PDU name, and exam-trap clarified. The cheat sheet that turns layer questions into …
Subnetting Without a Calculator — The Magic-Number Method
No, you can't use a calculator on the CompTIA Network+ N10-009 exam — you subnet by hand. Here's the magic-number method to subnet any IPv4 mask in under 30 …
ARP Poisoning: Intercepting Traffic on Your Own Network
Technical deep dive into ARP spoofing: how gratuitous ARP poisons caches, Scapy MitM scripts, Ettercap credential capture, DAI on Cisco Catalyst, and arpwatch …
Designing a Secure Campus Network: The SE's Reference Architecture
A complete reference architecture for secure campus networks — 3-tier design, ISE placement, firewall positioning, wireless security, and a 500-user bill of …
SSL Stripping: Downgrading HTTPS to HTTP Without the User Noticing
How SSL stripping intercepts HTTPS traffic via HTTP rewrites, where HSTS and HSTS preloading defend against it, and what sslstrip still bypasses in 2026.
VLAN Hopping: Jumping Between Network Segments You Shouldn't Access
Technical breakdown of VLAN hopping via switch spoofing and double tagging, with Scapy exploit code, Cisco IOS hardening configs, and PCI DSS segmentation …