FREE CompTIA Security+ Study Guide 2026 (SY0-701)

This free CompTIA Security+ study guide covers every domain the current SY0-701 exam tests, organized to CompTIA’s official exam objectives.^[2] Security+ is the industry’s baseline cybersecurity certification — it validates the core skills to assess security, monitor environments, respond to incidents, and operate with an awareness of laws and policies.

It’s interactive, not a wall of text: every module has built-in checkpoint quizzes, crawlable diagrams, flashcards, and practice questions, so you learn by doing — not just reading.

The Security+ SY0-701 exam has five domains, and we teach each one as its own module, leading with the heaviest-weighted content. Read a module, test yourself at each checkpoint, then drill gaps with our free practice test and flashcards. This guide is a high-yield overview mapped to the official objectives — not a full networking-and-security textbook.

CompTIA Security+ is one of the 14 CompTIA certifications — explore our CompTIA study guides to compare and prep across the whole family.

Security+ (SY0-701) Exam Snapshot

Two domains dominate. Security Operations (28%) and Threats, Vulnerabilities & Mitigations (22%) together are half the exam, so invest there first.^[2] Study by weight:

Module 1 · General Security Concepts

Domain 1.0 — 12% of the exam. This domain sets the vocabulary and mental models for everything else: the goals of security, how controls are categorized, the Zero Trust model, and the cryptography that underpins confidentiality, integrity, and trust.

1.1 CIA Triad, AAA & Control Types

Start with the goals. The CIA triad is the foundation of the entire exam: Confidentiality (only authorized people can read the data), Integrity (the data is accurate and unaltered), and Availability (authorized users can access it when needed). Security+ adds Non-repudiation and the AAA pillars — authentication, authorization, and accounting.

Every safeguard is a Security control. The exam asks you to classify them two ways: by category (technical, managerial, operational, physical) and by function (preventive, deterrent, detective, corrective, compensating, directive). A firewall is a technical, preventive control; a security camera is a physical, detective (and deterrent) control; restoring from backup is corrective.

1.2 Zero Trust & Physical Security

Zero Trust is a major SY0-701 theme. The old “castle-and-moat” model trusted anything inside the network; Zero Trust removes that implicit trust and verifies every request.

CompTIA splits it into a control plane (the Policy Engine decides grant or deny; the policy administrator executes) and a data plane (the Policy Enforcement Point allows or blocks each request). Key ideas: adaptive identity, threat-scope reduction, and policy-driven access.^[3]

Physical security is still on the exam: fencing, bollards, lighting, locks, badges, access control vestibules (mantraps), and sensors. So is deception and disruption technology — a honeypot is a decoy system to lure and study attackers; a honeynet is a network of them; honeyfiles and honeytokens are bait data that should never be touched, so any access is a clear alert.

1.3 Cryptography & PKI

Cryptography is the most technical part of Domain 1. There are three families: Symmetric encryption (one shared key, fast — AES), Asymmetric encryption (a public/private key pair — RSA, ECC), and Hashing (a one-way digest — SHA-256). They solve different problems: encryption for confidentiality, hashing for integrity.

Know which key does what. To send something only the recipient can read, encrypt with their public key. To prove a message is from you, create a Digital signature by signing with your private key. Because asymmetric crypto is slow, real systems are hybrid: asymmetric exchanges a fast symmetric session key (this is how TLS works).

Passwords are never encrypted — they’re hashed with a unique saltso identical passwords don’t share a hash and rainbow tables fail. Other building blocks: PKI and certificates (X.509), issued by a Certificate Authority and checked for revocation via CRL or OCSP; hardware roots of trust like the TPM and HSM; key escrow; and Steganography (hiding data inside other data).

Module 2 · Threats, Vulnerabilities & Mitigations

Domain 2.0 — 22% of the exam. This is the “attacks” domain: who attacks, how they get in, what weaknesses they exploit, and how you stop them. It’s the second-largest domain, so learn the vocabulary cold.

2.1 Threat Actors & Vectors

A Threat actor is whoever carries out an attack. Rank them by sophistication and resources: nation-state actors (an Advanced persistent threat) are the most capable and best-funded, motivated by espionage; organized crime is profit-driven; hacktivists pursue a cause; an Insider threat misuses authorized access; and unskilled attackers (“script kiddies”) use others’ tools. Watch for Shadow IT — unsanctioned tools that create unmanaged risk.

Actors get in through threat vectors and attack surfaces: email and messages, malicious files and images, removable media (a dropped USB), voice calls, unsecured networks, and the supply chain (a compromised vendor, MSP, or software update). Reducing the attack surface — fewer exposed services, ports, and entry points — is a recurring theme.

2.2 Social Engineering

Social engineering attacks the human, not the machine. The headliner is Phishing (fraudulent email); its variants are Vishing (voice), Smishing (SMS), spear phishing (targeted), and whaling (executives). Business email compromise impersonates a trusted leader or vendor to authorize fraudulent payments. Other techniques: pretexting, pharming, watering-hole attacks, typosquatting, brand impersonation, and disinformation.^[8]

Defenses are layered: user awareness training and phishing simulations on the human side, plus email authentication (SPF, DKIM, DMARC) to block spoofed senders on the technical side.

2.3 Vulnerabilities & Malware

Memorize the Malware zoo: Ransomware (encrypts data, demands payment), Trojan (disguised as legitimate), worm (self-propagating), virus (needs a host), spyware/keylogger, Rootkit (hides at the kernel level), and a Logic bomb (triggers on a condition).^[7]

Then the vulnerabilities attackers exploit. Application flaws: Buffer overflow, Race condition (TOCTOU), and memory injection. Web flaws: SQL injection and Cross-site scripting. Plus misconfiguration, weak/default credentials, unpatched systems, and the Zero-day (no patch exists yet). Common attacks to recognize include on-path (man-in-the-middle), replay, DNS/ARP poisoning, DDoS, and Privilege escalation.

2.4 Mitigation Techniques

The domain ends with how you reduce risk: Hardening (secure baselines, disabling unused services), patch management, encryption, network segmentation and isolation, access control and Least privilege, application allow-listing, sandboxing, monitoring, and configuration enforcement. The unifying idea is Defense in depth — layers, so one failure doesn’t mean a breach.

Module 3 · Security Architecture

Domain 3.0 — 18% of the exam. This domain is about designing secure systems: the trade-offs of different architecture models, building secure infrastructure, protecting data in all its states, and engineering resilience so the business survives a disruption.

3.1 Architecture Models & Cloud

Know the major models and their security trade-offs: on-premises vs. cloud, virtualization, Containerization, serverless, microservices, software-defined networking (SDN), and IaC. In the cloud, the most-tested idea is the Shared responsibility model: the provider secures the infrastructure (“security of the cloud”); the customer secures their data, identities, and configuration (“security in the cloud”). Where the line falls depends on IaaS vs. PaaS vs. SaaS.

Specialized systems carry extra risk: IoT, embedded systems, and ICS/SCADA (industrial control systems) often can’t be patched easily and need segmentation and compensating controls.

3.2 Secure Infrastructure

Build the network for security. Use security zones and device placement (a DMZ for public-facing servers), and the right appliance for the job: firewalls (a WAF for web apps, an NGFW/UTM for layered inspection), IDS/IPS (detect vs. block), proxies, a jump server for admin access, and load balancers.

Know fail-open vs. fail-closed, active vs. passive inspection, and inline vs. tap/monitor placement. On the access layer, 802.1X with EAP and port security control who connects.

3.3 Data Protection

Protect data in all three states: Data at rest (encrypt the disk/database), Data in transit (TLS), and Data in use (secure enclaves). Drive the level of protection with Data classification (public → sensitive → confidential → critical). Beyond encryption, you can de-identify data with masking, Tokenization, or hashing, and stop exfiltration with DLP.

3.4 Resilience & Recovery

Engineer for survival. High availability comes from redundancy: load balancing and clustering, multiple power feeds with UPS and generators, RAID, and geographic dispersion across sites. Recovery sites trade cost for speed — a hot site is ready immediately, a warm site needs some setup, and a cold site is just space and power. Back up using the 3-2-1 backup rule.

The exam loves the recovery metrics: RTO (how fast you must be back up), RPO (how much data you can afford to lose), plus MTBF (mean time between failures) and MTTR (mean time to repair). Test plans with tabletop exercises, failover, parallel processing, and simulations.

Module 4 · Security Operations

Domain 4.0 — 28% of the exam, the single largest domain. This is the day-to-day work of security: hardening and managing assets, finding and fixing vulnerabilities, monitoring, controlling identity and access, and responding when something goes wrong. Spend the most time here.

4.1 Hardening, Assets & Vulnerability Management

Apply Hardening from secure baselines across all targets — servers, workstations, mobile (MDM with BYOD/COPE), and wireless (use WPA3). Manage assets through their whole life: acquisition, inventory, and secure disposal/sanitization (wiping or destroying media).

Vulnerability management is a cycle: scan, then prioritize using CVSS severity and CVE identifiers, confirm findings (true vs. false positive), remediate, and rescan to validate. A Penetration test goes further by actually exploiting weaknesses; responsible disclosure and bug bounties bring in outside researchers.^[9]

4.2 Monitoring & Enterprise Capabilities

Visibility is everything. A SIEM aggregates and correlates logs from across the enterprise to detect threats, generate alerts, and support investigations — but it must be tuned to avoid alert fatigue.^[6]

Layer in enterprise controls: firewall and IDS/IPS rules, web and DNS filtering, email security (DKIM, DMARC, SPF), EDR/XDR on endpoints, file integrity monitoring, and sandboxing. Automate response with SOAR playbooks.

4.3 Identity & Access Management

Identity and access management (IAM) governs who can do what. It spans the identity lifecycle (provisioning and prompt deprovisioning when someone leaves), SSO and Federation (SAML, OAuth, OIDC, LDAP), and strong authentication with MFA.

Master the access-control models: RBAC (by role), MAC (by labels/clearance, high-security), DAC (owner decides), and ABAC (by attributes/context). Apply Least privilege and separation of duties, and protect admin accounts with PAM (vaulting, just-in-time, ephemeral access).

4.4 Incident Response & Forensics

When prevention fails, you respond. CompTIA follows the Incident response lifecycle (NIST SP 800-61): preparation; detection & analysis; containment, eradication & recovery; and post-incident activity (lessons learned and root cause analysis). Prepare with playbooks, training, tabletop exercises, and threat hunting.^[4]

Digital forensics preserves evidence: apply a Legal hold, maintain a Chain of custody (who handled what, when), acquire data in a sound order of volatility, and document everything so it’s admissible. Useful data sources include firewall, application, endpoint, and OS logs.

Module 5 · Security Program Management & Oversight

Domain 5.0 — 20% of the exam. This is the governance, risk, and compliance (GRC) side: the policies and structures that run a security program, how organizations measure and treat risk, managing third parties, and staying compliant. It’s less technical but heavily tested — learn the vocabulary and the formulas.

5.1 Governance

Governance is the framework that directs security: policies (AUP, incident response, business continuity, disaster recovery, SDLC, change management), standards (password, encryption, access control), and procedures (step-by-step playbooks, onboarding/offboarding). Oversight comes from boards, committees, and regulators, and clear data roles assign accountability.^[10]

5.2 Risk Management

Risk management runs in a cycle: identify, assess, analyze, and treat. Analysis is qualitative (rate likelihood × impact as low/medium/high) or quantitative (put dollars on it). The quantitative formulas are exam favorites: SLE = asset value × exposure factor; ALE = SLE × ARO.^[5] Track everything in a Risk register with an owner and threshold, set against the organization’s Risk appetite.

Then choose a response: mitigate (reduce with controls), transfer (insurance/outsourcing), avoid (stop the activity), or accept (within appetite). A business impact analysis (BIA) ranks what matters most and sets RTO/RPO.

5.3 Third-Party Risk & Compliance

Vendors are an attack surface. Assess them with Due diligence, right-to-audit clauses, penetration testing, and supply-chain analysis, and formalize the relationship with agreements. Learn the acronyms: SLA, MOU / MOA, MSA, SOW/WO, NDA, and BPA.

Compliance means meeting laws and regulations. Failure brings consequences — fines, sanctions, reputational damage, even loss of license. Privacy is central: know the difference between a data controller and processor, data retention, and the Right to be forgotten.

5.4 Audits & Security Awareness

Audits and assessments verify the program works — internal vs. external, attestation, and regulatory exams. Penetration tests are classified by knowledge given to the tester: known (white-box), partially known (gray-box), and unknown (black-box) environments, and reconnaissance can be passive or active.

Finally, security awareness is itself a program: phishing campaigns, recognizing anomalous behavior, user training and guidance, and ongoing reporting and monitoring. People are both the biggest risk and the strongest control — a trained workforce is a force multiplier.

How to Use This Security+ Study Guide

This guide is built to be worked, not just read. The most efficient path to a pass:

• Study by weight. Security Operations (28%) and Threats, Vulnerabilities & Mitigations (22%) are half the exam — start there, then Program Management, Architecture, and General Concepts.
• Check off as you go. Use the Study Guide Contents to mark each section done; it raises your exam-readiness score.
• Take every checkpoint. The end-of-module quizzes show you exactly which domains need another pass.
• Practice the PBQs. Performance-based questions reward hands-on knowledge — drill commands, log reading, and configuration concepts, not just definitions.
• Drill the weak domain. Send your weak area into the flashcards and a practice test until the score climbs comfortably above 750.

Security+ Glossary

The high-yield Security+ terms in one place — hover any dotted term in the guide, or flip the whole deck here as a self-grading flashcard set.

3-2-1 backup rule

Keep 3 copies of data, on 2 different media, with 1 copy offsite.

AAA

Authentication (proving identity), Authorization (granting access rights), and Accounting (logging what was done).

ABAC

Attribute-Based Access Control — access decided by attributes and context (user, resource, environment).

Advanced persistent threat

A skilled, well-resourced (often nation-state) adversary that maintains long-term, stealthy access to a network.

ALE

Annualized Loss Expectancy — expected yearly loss from a risk (SLE × ARO).

ARO

Annualized Rate of Occurrence — how many times per year a risk is expected to happen.

Asymmetric encryption

Encryption using a public/private key pair (e.g., RSA, ECC); data encrypted with one key is decrypted only with the other.

Buffer overflow

Writing more data than a buffer can hold, overwriting adjacent memory — potentially to run attacker code.

Business email compromise

An attack impersonating a trusted executive or vendor to authorize fraudulent payments or data transfers.

Certificate Authority

A trusted entity that issues and signs digital certificates, vouching for the identity bound to a public key.

Chain of custody

Documentation tracking who handled evidence, when, and how — to keep it admissible.

CIA triad

The three core goals of information security — Confidentiality (only authorized access), Integrity (data is unaltered), and Availability (accessible when needed).

Containerization

Packaging an app with its dependencies in an isolated container that shares the host OS kernel (e.g., Docker).

CRL

Certificate Revocation List — a published list of certificates a CA has revoked before expiry.

Cross-site scripting

An attack injecting malicious script into a trusted site that runs in another user's browser (stored, reflected, or DOM-based).

CVE

Common Vulnerabilities and Exposures — a public catalog of unique IDs for known vulnerabilities.

CVSS

Common Vulnerability Scoring System — a 0–10 score rating the severity of a vulnerability.

DAC

Discretionary Access Control — the resource owner decides who gets access.

Data at rest

Data stored on a disk, database, or backup — protected with encryption and access control.

Data classification

Labeling data by sensitivity (e.g., public, sensitive, confidential, critical) to apply the right controls.

Data in transit

Data moving across a network — protected with TLS and other transport encryption.

Data in use

Data actively being processed in memory — protected by techniques such as secure enclaves.

Defense in depth

Layering multiple independent controls so the failure of one doesn't expose the asset.

Digital certificate

An X.509 file binding a public key to a verified identity, signed by a CA, used to establish trust (e.g., in TLS).

Digital signature

A hash of a message encrypted with the signer's private key; proves integrity and authenticity (non-repudiation).

DLP

Data Loss Prevention — tools that detect and block unauthorized movement of sensitive data.

Due diligence

The investigation and care taken to identify risks before entering an agreement or activity.

EDR

Endpoint Detection and Response — continuously monitors endpoints to detect, investigate, and respond to threats.

Federation

Allowing identities from one domain to access resources in another via a trust relationship (e.g., SAML, OIDC).

Governance

The policies, standards, procedures, and oversight structures that direct a security program.

Hardening

Reducing a system's attack surface by removing unneeded services, applying secure baselines, and patching.

Hashing

A one-way function producing a fixed-length digest of input (e.g., SHA-256); used for integrity and password storage, not reversible.

High availability

Designing systems to remain operational with minimal downtime through redundancy and failover.

HSM

Hardware Security Module — a dedicated, tamper-resistant device for generating, storing, and using cryptographic keys.

IaC

Infrastructure as Code — defining and provisioning infrastructure through machine-readable, version-controlled files.

Identity and access management

The policies and tools that manage digital identities and control access to resources.

Incident response lifecycle

The NIST phases: preparation; detection & analysis; containment, eradication & recovery; post-incident activity.

Insider threat

A current or former employee, contractor, or partner who misuses authorized access to harm the organization.

Least privilege

Granting only the minimum access needed to perform a task — limits the blast radius of a compromise.

Legal hold

A directive to preserve relevant data when litigation or investigation is anticipated.

Logic bomb

Malicious code that executes when a specific condition is met (e.g., a date or an event).

MAC

Mandatory Access Control — access enforced by labels/clearances set by the system, used in high-security environments.

Malware

Malicious software — including ransomware, trojans, worms, viruses, spyware, rootkits, and keyloggers.

MFA

Multi-factor authentication — requiring two or more factors from different categories (know, have, are).

MOU

Memorandum of Understanding — a non-binding agreement outlining mutual intentions between parties.

Non-repudiation

Assurance that someone cannot deny having performed an action; provided by digital signatures and logging.

OCSP

Online Certificate Status Protocol — a real-time query to check whether a certificate is revoked.

On-path attack

An attacker secretly relaying or altering traffic between two parties (formerly 'man-in-the-middle').

PAM

Privileged Access Management — controls, vaults, and audits privileged (admin) accounts, often with just-in-time access.

Penetration test

An authorized simulated attack to find and exploit weaknesses before real attackers do.

Phishing

A fraudulent message (usually email) that tricks the victim into revealing credentials or running malware.

PKI

Public Key Infrastructure — the CAs, policies, and keys that issue and manage digital certificates.

Policy Enforcement Point

The Zero Trust data-plane component that allows or blocks each actual request to a resource.

Policy Engine

The Zero Trust control-plane component that decides whether to grant or deny access using policy and context.

Privilege escalation

Gaining higher access rights than granted — vertical (to admin) or horizontal (to another user).

Race condition

A flaw where the outcome depends on the timing of events; the time-of-check to time-of-use (TOCTOU) bug is the classic case.

Ransomware

Malware that encrypts a victim's data and demands payment for the decryption key; often also steals data (double extortion).

RBAC

Role-Based Access Control — permissions assigned to roles, which users inherit.

Right to be forgotten

A privacy right allowing individuals to request deletion of their personal data.

Risk appetite

The amount and type of risk an organization is willing to accept in pursuit of its objectives.

Risk register

A documented list of identified risks with their owner, likelihood, impact, and treatment.

Risk transference

Shifting risk to another party, such as buying insurance or outsourcing.

Rootkit

Malware that hides deep in the system (often the kernel) to maintain stealthy, privileged access.

RPO

Recovery Point Objective — the maximum acceptable amount of data loss, measured as time since the last backup.

RTO

Recovery Time Objective — the maximum acceptable time to restore a system after an outage.

Salting

Adding unique random data to a password before hashing so identical passwords produce different hashes and rainbow tables fail.

Security control

A safeguard categorized as technical, managerial, operational, or physical, and by function (preventive, detective, etc.).

Shadow IT

Hardware, software, or services used without the IT/security team's approval or knowledge.

Shared responsibility model

Cloud division of duties: the provider secures the infrastructure; the customer secures data, identities, and configuration.

SIEM

Security Information and Event Management — collects and correlates logs across the enterprise to detect and investigate threats.

SLA

Service Level Agreement — a contract defining expected service levels and metrics with a provider.

SLE

Single Loss Expectancy — the expected dollar loss from a single occurrence (asset value × exposure factor).

Smishing

SMS phishing — a social-engineering attack delivered by text message.

SOAR

Security Orchestration, Automation, and Response — automates and coordinates incident response via playbooks.

Social engineering

Manipulating people into divulging information or performing actions that compromise security.

SQL injection

A web attack inserting malicious SQL into input so the database runs unintended commands; mitigated with parameterized queries.

SSO

Single Sign-On — one authentication grants access to multiple systems.

Steganography

Hiding data inside other data (e.g., within an image) so its very existence is concealed.

Symmetric encryption

Encryption using one shared secret key to both encrypt and decrypt (e.g., AES) — fast, but the key must be shared securely.

Threat actor

An individual or group that carries out an attack — e.g., nation-state, organized crime, hacktivist, insider, or unskilled attacker.

Tokenization

Replacing sensitive data with a non-sensitive token, with the real value stored securely elsewhere.

TPM

Trusted Platform Module — a hardware chip that securely stores keys and supports disk encryption and integrity checks.

Trojan

Malware disguised as legitimate software that performs a hidden malicious action when run.

Vishing

Voice phishing — a social-engineering attack carried out over a phone call.

Zero Trust

A model that removes implicit trust and verifies every request based on identity, device, and context — 'never trust, always verify.'

Zero-day

A vulnerability unknown to the vendor (no patch yet) that attackers can exploit.

Security+ Study Guide FAQ

References

1. 1.CompTIA. “CompTIA Security+ (SY0-701) Certification.” comptia.org. ↑
2. 2.CompTIA. “Security+ (SY0-701) Exam Objectives.” comptia.org. ↑
3. 3.National Institute of Standards and Technology. “SP 800-207, Zero Trust Architecture.” csrc.nist.gov. ↑
4. 4.National Institute of Standards and Technology. “SP 800-61, Computer Security Incident Handling Guide.” csrc.nist.gov. ↑
5. 5.National Institute of Standards and Technology. “SP 800-30, Guide for Conducting Risk Assessments.” csrc.nist.gov. ↑
6. 6.National Institute of Standards and Technology. “Cybersecurity Framework (CSF) 2.0.” nist.gov. ↑
7. 7.Cybersecurity and Infrastructure Security Agency. “Stop Ransomware: Ransomware 101.” cisa.gov. ↑
8. 8.Cybersecurity and Infrastructure Security Agency. “Recognize and Report Phishing.” cisa.gov. ↑
9. 9.Forum of Incident Response and Security Teams. “Common Vulnerability Scoring System (CVSS).” first.org. ↑
10. 10.International Organization for Standardization. “ISO/IEC 27001 Information Security Management.” iso.org. ↑
11. 101.National Institute of Standards and Technology (NIST). “Confidentiality (CSRC Glossary).” csrc.nist.gov, accessed 19 June 2026. ↑
12. 102.National Institute of Standards and Technology (NIST). “Cryptography (CSRC Glossary).” csrc.nist.gov, accessed 19 June 2026. ↑
13. 103.National Institute of Standards and Technology (NIST). “Hash function (CSRC Glossary).” csrc.nist.gov, accessed 19 June 2026. ↑
14. 104.National Institute of Standards and Technology (NIST). “Public Key Infrastructure (CSRC Glossary).” csrc.nist.gov, accessed 19 June 2026. ↑
15. 105.National Institute of Standards and Technology (NIST). “Defense-in-depth (CSRC Glossary).” csrc.nist.gov, accessed 19 June 2026. ↑
16. 106.National Institute of Standards and Technology (NIST). “SQL Injection (CSRC Glossary).” csrc.nist.gov, accessed 19 June 2026. ↑
17. 107.National Institute of Standards and Technology (NIST). “Cross-Site Scripting (CSRC Glossary).” csrc.nist.gov, accessed 19 June 2026. ↑
18. 108.National Institute of Standards and Technology (NIST). “Advanced Persistent Threat (CSRC Glossary).” csrc.nist.gov, accessed 19 June 2026. ↑
19. 109.National Institute of Standards and Technology (NIST). “Multi-Factor Authentication (CSRC Glossary).” csrc.nist.gov, accessed 19 June 2026. ↑
20. 110.National Institute of Standards and Technology (NIST). “Least Privilege (CSRC Glossary).” csrc.nist.gov, accessed 19 June 2026. ↑
21. 111.National Institute of Standards and Technology (NIST). “Security Information and Event Management (CSRC Glossary).” csrc.nist.gov, accessed 19 June 2026. ↑
22. 112.National Institute of Standards and Technology (NIST). “Role-Based Access Control (CSRC Glossary).” csrc.nist.gov, accessed 19 June 2026. ↑

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