IT Operations & Cybersecurity Encyclopedia

Security architecture review guide

A security architecture review checks whether the organization’s identity, network, cloud, endpoints, applications, data, logging, resilience, and third-party access controls work together as a defensible system. The goal is to find design gaps before they become audit findings, cyber insurance problems, or incident-response surprises.

Security architectureZero trustControl designRisk exceptionsArchitecture evidence

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Why it matters

Review how security controls fit together

Security architecture is not a single firewall, tool, policy, or diagram. It is the way security decisions are designed across identities, devices, networks, applications, cloud services, data stores, monitoring, backup, and operations.

A practical review should compare intended architecture against live configurations, business risk, data sensitivity, regulatory needs, operational ownership, and evidence. It should produce prioritized gaps, decisions, and remediation owners.

This guide supports architecture planning and audit readiness. It does not replace a penetration test, compliance assessment, legal review, vendor engineering design, or professional cybersecurity audit.

Practical rule: A security architecture review should prove where trust is granted, where data flows, where controls enforce policy, and who owns exceptions.

Minimum security architecture review evidence

Architecture diagrams showing users, devices, networks, cloud platforms, SaaS applications, data stores, third parties, security tools, and administrative paths.
Identity evidence showing MFA, conditional access, privileged roles, service accounts, break-glass accounts, access reviews, and guest or vendor access.
Network evidence showing segmentation, firewall paths, VPN, SD-WAN, routing, remote access, management networks, and exposed services.
Cloud evidence showing landing zones, subscriptions or accounts, IAM, logging, storage exposure, private connectivity, backup, and security posture findings.
Endpoint evidence showing device inventory, management enrollment, EDR, patching, encryption, local admin, and remote support controls.
Data evidence showing sensitive data locations, encryption, DLP, backup, retention, sharing controls, and data owner decisions.
Operations evidence showing logs, alerts, incident workflow, exceptions, risk register, remediation tracking, and executive reporting.

Review scope

Security architecture review domains

Identity and privilege

Review MFA, conditional access, privileged roles, access reviews, service accounts, guests, vendors, and break-glass accounts.

Network and segmentation

Validate firewall paths, routing, VPN, SD-WAN, management networks, remote access, and segmentation boundaries.

Cloud and SaaS

Check cloud landing zones, IAM, logging, storage exposure, private access, SaaS roles, integrations, and tenant controls.

Endpoint and workload security

Review endpoint management, EDR, patching, encryption, server hardening, vulnerability management, and remote support.

Data protection and resilience

Map sensitive data, backup, immutability, retention, DLP, recovery tests, and ransomware recovery dependencies.

Monitoring and governance

Confirm logs, alerts, SIEM, tickets, risk exceptions, policy ownership, remediation tracking, and executive reporting.

Review matrix

Security architecture review matrix

Area	What to verify	Questions to answer	Evidence
Identity	MFA, conditional access, privileged roles, service accounts, guests, vendors, and break-glass accounts.	Who can access critical systems and under what conditions?	MFA report, access review, role export, service account list, and exception register.
Network	Segmentation, firewall paths, routing, VPN, remote access, management networks, and exposed services.	Can traffic bypass intended security controls?	Network diagram, firewall rule export, route table, VPN config, and path tests.
Cloud	Accounts, subscriptions, IAM, logs, storage, private connectivity, security posture, and backup.	Does cloud design match risk and operations?	Cloud architecture diagram, IAM report, logging settings, posture findings, and remediation plan.
Endpoints	Device inventory, MDM, EDR, patching, encryption, local admin, remote support, and vulnerability exposure.	Are endpoints managed and monitored?	Device compliance report, EDR dashboard, patch report, encryption report, and local admin review.
Data	Sensitive data locations, encryption, sharing, DLP, backup, retention, and recovery evidence.	Where is sensitive data and how is it protected?	Data map, DLP policy, backup report, sharing review, and recovery test.
Governance	Ownership, policies, exceptions, risk register, monitoring, incidents, remediation, and executive decisions.	Are gaps owned and tracked?	Risk register, tickets, policy owner list, incident workflow, and executive report.

Step-by-step review

Security architecture review runbook

Collect architecture evidence

Gather diagrams, asset lists, cloud inventories, identity reports, firewall paths, data maps, backup reports, and security tool dashboards.

Map business-critical systems and data

Identify critical applications, sensitive data, owners, dependencies, vendors, remote users, cloud services, and recovery expectations.

Review trust boundaries

Validate where access is granted, where segmentation exists, which paths are inspected, and where implicit trust remains.

Compare controls to live configuration

Check identity, endpoint, network, cloud, data, logging, and backup settings against the intended design.

Identify exceptions and design gaps

Document bypasses, weak controls, missing logs, unowned risks, stale rules, over-privileged access, and unsupported dependencies.

Prioritize remediation

Assign owners, severity, business impact, evidence needed, due dates, dependencies, budget needs, and executive decisions.

Create the architecture review package

Deliver findings, diagrams, evidence, risk decisions, quick wins, roadmap items, and review cadence.

Common risks

Common security architecture review findings

Diagrams do not match reality

Architecture diagrams often miss cloud resources, vendor access, routing changes, SaaS integrations, and emergency exceptions.

Identity controls are inconsistent

MFA, conditional access, privileged roles, and service accounts may be strong in one system and weak in another.

Segmentation is assumed

VLANs, firewalls, cloud security groups, and route tables must be tested against actual traffic paths.

Cloud logging is incomplete

Cloud and SaaS logs need retention, alerting, ownership, and incident workflow before they are useful.

Data flows are undocumented

Sensitive data may move through exports, integrations, file transfers, reports, and backups outside the main application.

Exceptions have no expiration

Temporary access, firewall rules, unsupported systems, and compensating controls should have owners and review dates.

Related support

Where IT Perfection can help

IT Perfection can help document security architecture, improve Microsoft 365, Azure, network, endpoint, backup, and managed IT controls for practical operations.

OC Security Audit can help perform cybersecurity risk assessments, architecture reviews, cyber insurance readiness reviews, and audit evidence validation.

Related professional support

Created by Ali Hassani, CISO

Professional security architecture review support

Ali Hassani brings 25+ years of hands-on experience across IT operations, cybersecurity, Microsoft infrastructure, network security, compliance readiness, cloud services, healthcare IT, MSP services, and business technology leadership.

This guide is for initial education and planning. It does not replace a professional cybersecurity audit, compliance assessment, penetration test, legal review, vendor engineering review, or Microsoft professional services engagement.

Architecture reviews turn design into decisions

A strong review connects diagrams, configurations, owners, risks, exceptions, and evidence so security architecture can be improved instead of merely described.

Contact IT Perfection About Ali Hassani

FAQ

Security architecture review FAQ

What should a security architecture review include?

It should include identity, network, cloud, endpoints, applications, data protection, logging, resilience, third-party access, exceptions, and remediation ownership.

How often should architecture be reviewed?

Review at least annually and after major cloud, network, identity, application, acquisition, compliance, or incident-response changes.

Is a security architecture review the same as a penetration test?

No. A penetration test validates exploitability. An architecture review evaluates design, controls, evidence, ownership, and risk decisions.

What should the output include?

The output should include diagrams, evidence, gaps, risk ratings, quick wins, roadmap items, owners, due dates, and executive decisions.