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100 guidesCompTIA A+ Cheat Sheet 2026
Every port, connector type, RAM, storage interface, wireless standard, Windows command, security threat, troubleshooting methodology, and key acronym for the 220-1201 and 220-1202 exams — on one page.
Read Article →Best CompTIA A+ Study Resources
The study guide, practice exams, and free resources worth your time — with prices, honest pros/cons, and who each is best for.
Read Guide →Best CompTIA Network+ Study Resources
Network+ is harder than A+ and worth more on a resume. Here's the Sybex study guide (with 10% exam voucher), Dion practice exams, and Professor Messer's free course.
Read Guide →Best CompTIA Security+ Study Resources
Security+ is the most recognized entry-level cybersecurity certification. Here's the Chapple & Seidl Sybex kit, Dion practice exams, and Professor Messer's free SY0-701 course.
Read Guide →What is Cryptography?
Symmetric vs asymmetric encryption, hashing, PKI, digital signatures, and every cryptography concept tested on CompTIA Security+ SY0-701 — explained clearly with exam scenarios.
Read Guide →Encryption Types — Symmetric, Asymmetric, Hashing & Hybrid
AES, RSA, ECC, DES, SHA, MD5, Diffie-Hellman, HMAC — every algorithm tested on CompTIA Security+ with key distinctions, status (current/broken/deprecated), and 6 exam scenarios.
Read Guide →Cloud Computing Concepts — IaaS, PaaS, SaaS & Shared Responsibility
The three cloud service models, deployment types (public/private/hybrid/community), the shared responsibility model, CASB, shadow IT, and 6 exam scenarios tested across all three CompTIA exams.
Read Guide →Zero Trust Security Explained
Never trust, always verify — Zero Trust is explicitly named in SY0-701. Covers the three core principles, five pillars, microsegmentation, ZTNA, JIT access, PDP/PEP, and 6 exam scenarios.
Read Guide →Network Segmentation — VLANs, DMZ, Microsegmentation
VLANs, screened subnets (DMZ), subnetting, air gaps, microsegmentation, and jump servers — how dividing a network into zones limits attack spread. Covers east-west vs north-south traffic, VLAN hopping, and 6 exam scenarios for Network+ and Security+.
Read Guide →Physical Security Controls — Mantraps, Badges, Cameras & Secure Disposal
Access control vestibules, badge readers, biometrics (FAR/FRR/CER), CCTV, bollards, degaussing, shredding, and cryptographic erase — all physical security controls tested on Security+ SY0-701.
Read Guide →Common Network Attacks Explained
Phishing, man-in-the-middle, DoS, DDoS, SQL injection, social engineering, and malware types — every attack tested on CompTIA Security+ and A+ with exam scenarios.
Read Guide →What is a VPN?
How VPNs work, tunneling protocols (IPsec, OpenVPN, PPTP), VPN types, split tunneling, and every VPN concept tested on CompTIA Network+ and Security+.
Read Guide →CompTIA A+ vs Network+ — Which Should You Take First?
What's the difference, which is harder, which pays more, and exactly which certification you should tackle first based on where you are right now.
Read Guide →Network+ vs Security+ — Which Should You Take Next?
Networking track or cybersecurity track? Which is harder, which pays more, and which certification makes sense based on where you want your IT career to go.
Read Guide →CompTIA CySA+ Explained — The Cybersecurity Analyst Cert After Security+
What CySA+ covers, who it's for, exam details, salary impact, and how it fits into the CompTIA cybersecurity path after Security+.
Read Guide →CompTIA CASP+ Explained — Advanced Security Practitioner Cert
What CASP+ covers, how it compares to CISSP, who should pursue it, and where it fits in the CompTIA advanced security certification path.
Read Guide →How to Pass CompTIA Network+ in 2026
A realistic study plan for N10-009, the subnetting strategy most candidates get wrong, domain breakdowns, and exam day tips that actually make a difference.
Read Guide →VLANs Explained — What is a VLAN?
What a VLAN is, how 802.1Q tagging works, trunk vs access ports, inter-VLAN routing (router on a stick vs Layer 3 switch), and every VLAN concept tested on Network+.
Read Article →What is a Router? How Routers Work
Routing tables, default gateways, static vs dynamic routing, NAT, longest prefix match, and every router concept tested on CompTIA A+ and Network+ — explained clearly.
Read Article →What is a Network Switch? How Switches Work
MAC address tables, VLANs, managed vs unmanaged, STP, port security, and every switch concept tested on CompTIA A+ and Network+ — explained clearly.
Read Article →CompTIA Network+ Cheat Sheet 2026
Every port number, OSI model layer, subnetting reference, routing protocol, wireless standard, troubleshooting command, and key acronym for the N10-009 exam — all in one page.
View Cheat Sheet →How to Pass CompTIA Security+ in 2026
A realistic study plan for SY0-701, why scenario thinking matters more than memorisation, domain breakdowns, and the governance content most candidates skip and fail on.
Read Guide →CompTIA A+ Complete Study Guide
Everything you need to pass 220-1201 and 220-1202 — both exam domain breakdowns, a 9-week study plan, the three highest-ROI topics, and links to every A+ concept on IT Study Hub organised by domain.
Read Guide →Cloud Security Explained — CASB, CSPM & Misconfigurations
Security+ SY0-701 Domain 3 cloud security — shared responsibility model, CASB vs CSPM vs CWPP vs SASE, top cloud misconfigurations, serverless security, and container security with exam scenarios.
Read Guide →How to Pass CompTIA A+ in 2026
A realistic study plan, what the exam actually tests across Core 1 and Core 2, how long to study, and exam day strategies that make a real difference.
Read Guide →Identity and Access Management (IAM) Explained
MFA, SSO, Zero Trust, LDAP, PAM, and access control models — every IAM concept tested on CompTIA Security+ SY0-701, with exam scenarios.
Read Guide →Group Policy Objects (GPOs) Explained
GPO creation, LSDOU processing order (Local → Site → Domain → OU), inheritance, Block Inheritance vs Enforcement, security filtering, common security policies (password, BitLocker, AppLocker), and the gpupdate/gpresult commands.
Read Guide →CompTIA Port Numbers — Complete Reference
Every port tested on A+, Network+, and Security+ — FTP (20/21), SSH (22), DNS (53), HTTP/S (80/443), RDP (3389), LDAP/S (389/636), SNMP (161), and more. TCP vs UDP, encrypted vs unencrypted pairs, and the three biggest port exam traps.
Read Guide →Incident Response Playbooks
Step-by-step IR playbooks for ransomware, data breach, DDoS, and phishing — mapped to PICERL phases. Covers containment strategies, order of volatility, notification sequencing, and the most tested IR scenario questions on Security+ SY0-701.
Read Guide →CompTIA Network+ Complete Study Guide
Everything you need to pass Network+ N10-009 — exam structure, all 5 domain weightings, an 8-week study plan, the three highest-ROI topics, performance-based question formats, and links to every Network+ concept on IT Study Hub.
Read Guide →Subnetting Guide — Magic Number Method & VLSM
The fastest subnetting method for exam conditions — magic number technique, every CIDR from /24 to /30, VLSM for variable-size subnets, four step-by-step worked examples, and three full PBQ-style practice scenarios for Network+ N10-009.
Read Guide →CompTIA Security+ Complete Study Guide
Everything you need to pass Security+ SY0-701 — all 5 domain weightings, a 10-week study plan, the three highest-ROI topics, PBQ format guide, and links to every Security+ concept on IT Study Hub organised by domain.
Read Guide →Wireless Networking Explained
802.11 standards through Wi-Fi 6E, WPA3, site surveys (passive vs active vs predictive), RSSI and SNR metrics, EAP types for 802.1X (EAP-TLS, PEAP, EAP-FAST), antenna types, and the wireless troubleshooting methodology the exam puts in scenario questions.
Read Guide →OSI Model Explained (All 7 Layers)
The single most tested networking concept across A+, Network+, and Security+. Learn which protocols live at which layer, the memory tricks that actually stick, and how to use the OSI model to diagnose network problems the way the exam expects.
Read Guide →TCP vs UDP Explained
Why TCP uses a three-way handshake and UDP doesn't, which applications use each, the flags the exam tests (SYN, ACK, FIN, RST), and the security implications both protocols carry on Security+.
Read Guide →What Is a MAC Address?
Every network device has a hardware address burned in at the factory. Learn how MACs differ from IPs, how switches use them, and how ARP connects the two.
Read Guide →Port Numbers — Complete Guide
Every port tested on A+, Network+, and Security+ — from the basics (80, 443, 22, 53) through Network+ infrastructure ports (BGP 179, RADIUS 1812, SIP 5060) and Security+ attack-surface ports (RDP 3389, SMB 445, Kerberos 88) — with exam scenarios for each.
Read Guide →What Is a Subnet Mask?
How subnet masks decide whether traffic stays local or goes to the router, the CIDR notation the exam uses constantly, and the segmentation scenarios that appear on both A+ and Network+.
Read Guide →Subnetting Explained
How to calculate network addresses, host ranges, and broadcast addresses. CIDR notation, worked examples, and every scenario tested on A+ and Network+.
Read Guide →What Is DHCP?
The DORA process (Discover, Offer, Request, Acknowledge), lease times, APIPA fallback, DHCP relay agents, and what 169.254.x.x actually tells you when you're troubleshooting a connectivity problem.
Read Guide →What Is DNS?
How DNS resolves names to IPs, the record types the exam tests (A, AAAA, MX, CNAME, PTR, NS), what breaks when DNS fails (IP works but names don't), and the DNS attacks — spoofing, poisoning, and hijacking — on Security+. Troubleshoot with nslookup and dig.
Read Guide →What Is APIPA?
Why Windows assigns 169.254.x.x when DHCP fails, how to immediately recognise it as a DHCP problem, and the exact troubleshooting steps (ipconfig /release and /renew) the A+ exam expects when a user reports "no internet after moving to a new office."
Read Guide →IPv4 vs IPv6 Explained
Why IPv6 was created, how 128-bit addresses work vs 32-bit, the special address types the exam tests (link-local, loopback, multicast, global unicast), transition mechanisms (dual-stack, tunneling, NAT64), and the A+/Network+ scenarios you'll see.
Read Guide →What Is a Default Gateway?
How the default gateway determines where traffic goes when the destination isn't on the local network, why "can ping 192.168.1.1 but not 8.8.8.8" points straight to a gateway problem, and how routing tables use it on Network+.
Read Guide →What Is NAT?
How NAT maps thousands of private devices to a single public IP, the difference between static NAT, dynamic NAT, and PAT (the one your home router uses), and why NAT exists — and what breaks when it's misconfigured on the Network+ exam.
Read Guide →Router vs Switch — What's the Difference?
Routers forward packets using IP addresses at Layer 3; switches forward frames using MAC addresses at Layer 2. When to use each, how MAC address tables are built, how routing tables differ, and the Layer 3 switch scenario that trips up most Network+ candidates.
Read Guide →Network Troubleshooting Commands
Windows commands (ipconfig, ping, tracert, nslookup, netstat) plus Linux equivalents (ip addr, dig, ss, tcpdump, nmap) — with a step-by-step diagnostic workflow and the A+/Network+/Security+ scenarios each command appears in.
Read Guide →Firewall Basics Explained
How firewall rules work (allow/deny, implicit deny at the end of every rule list), stateful vs stateless inspection, host-based vs network-based, Windows Defender Firewall profiles, and the ACL scenarios that appear on Network+ and Security+.
Read Guide →Build Your First IT Home Lab on a Budget
You don't need expensive hardware. Start with two laptops and free VMs — how to build a realistic Windows Server lab for practicing A+, Network+, and Security+ scenarios including Active Directory, Group Policy, DNS, and RDP.
Read Guide →Ready to sit the exam?
Pair these guides with a study book and practice exams for the highest chance of passing first try.