Cheat-Sheet on it-learn.io | IT, Networking & Cybersecurity Blog

Free Network+ Practice Test — 20 Questions, Real Exam Style

it-learn.io — Sat, 13 Jun 2026 00:00:00 +0000

Came from the IG reel? You commented, here are all 20. 👇

These are 20 free Network+ practice questions in the exact format of the N10-009 exam, spread across all five domains. Answer each one honestly — no Googling, no flashcards open — then click Show answer to reveal the explanation and check yourself.

The 20-question practice test

Pick your answer for each question first, then click Show answer to check it. No peeking — the whole point of a practice test is committing to an answer before you see the right one. Keep a tally as you go; there’s a scoring guide at the bottom.

Network+ Ports Cheat Sheet — All 30 Worth Memorizing on One Page

it-learn.io — Sat, 13 Jun 2026 00:00:00 +0000

You don’t need to memorize 100 ports for the Network+ exam. You need about 30. Here they are, one page, ranked by how often they actually show up.

If you came from the IG comment-bait reel and you just want the cheat sheet — scroll down. Save the table. Comment PORTS on the reel if you haven’t already and I’ll DM you back when this updates.

The 30 ports you must know cold

These appear in roughly 60–80% of port questions on the N10-009 exam. If you can’t recall any of these in under 5 seconds, you’re not done studying. Drill until they’re reflex.

Security+ Acronyms — 60 You Must Know, Ranked by Exam Frequency

it-learn.io — Sat, 13 Jun 2026 00:00:00 +0000

The official Security+ SY0-701 acronym list has 200+ entries. You don’t need all 200. You need about 60 — the ones that actually appear on the exam in 80% of questions.

Here they are, ranked by exam frequency and grouped by domain. Came from the IG reel? Scroll to the list and start drilling.

Tier 1 — Memorize cold (the 30 that appear in every exam)

These show up in 60+% of questions. If you can’t recall any of these in under 5 seconds — both directions — keep studying.

Security+ Crypto Decoder — Symmetric vs Asymmetric vs Hashing on One Page

it-learn.io — Sat, 13 Jun 2026 00:00:00 +0000

The crypto domain is where most Security+ candidates lose points. Not because the math is hard — the math isn’t even on the exam — but because the textbook teaches it as algorithm memorization when the exam tests use-case decisions.

Came from the IG reel? Scroll straight to the decoder. The whole crypto domain fits on one page.

The decoder — three columns, one decision

	Symmetric	Asymmetric	Hashing
Keys	1 shared key	2 keys (public + private)	No key
Reversible?	Yes (with key)	Yes (with private key)	No — one-way
Speed	Fast ⚡	Slow (100–1000×)	Fast ⚡
Used for	Bulk data encryption	Key exchange + digital signatures	Integrity + password storage
Common algos	AES, ChaCha20, 3DES (deprecated)	RSA, ECC, Diffie-Hellman, ECDH	SHA-256, SHA-3, bcrypt, Argon2
Key/output size	128 / 192 / 256 bit	2048 / 3072 / 4096 bit (RSA); 256+ (ECC)	256 / 384 / 512 bit

The single rule: use asymmetric to exchange a symmetric key, then switch to symmetric for the bulk data. That’s TLS in one sentence. That’s HTTPS in one sentence. That’s how every secure messaging app works.

Subnetting Quick Reference — The 60-Second Method on One Page

it-learn.io — Sat, 13 Jun 2026 00:00:00 +0000

Subnetting in 60 seconds. No tables to memorize. No binary conversion. One rule, three results.

If you came from the IG reel — scroll to the magic-number table. Save the page. The whole method fits on one screen.

The one rule

Subtract the interesting octet of the subnet mask from 256. The result is your block size.

The “interesting octet” is the one that’s not 0 and not 255. For 255.255.255.224, the interesting octet is 224. So: