Episode 64 — A.8.21–8.22 — Security of network services; Segregation of networks

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Framework - ISO 27001 (Cyber)

Jason Edwards

71 episodes

23 hours ago

The ISO/IEC 27001 Framework is the internationally recognized standard for establishing, implementing, maintaining, and continually improving an Information Security Management System (ISMS). It provides a systematic approach to managing sensitive information through risk management, governance, and control implementation. At its core, ISO 27001 helps organizations protect the confidentiality, integrity, and availability of data—whether stored, processed, or transmitted—by aligning security practices with business objectives and regulatory requirements. The framework is built around a risk-based process, requiring organizations to identify potential threats, assess their likelihood and impact, and implement appropriate controls from the companion standard ISO/IEC 27002. These controls cover a wide range of areas including asset management, access control, cryptography, operations security, and supplier relationships. By tailoring these controls to organizational needs, ISO 27001 supports both flexibility and accountability—ensuring that security measures are not just technical but also strategic and operational. Beyond compliance, ISO 27001 fosters a culture of continuous improvement through regular audits, performance monitoring, and leadership involvement. Certification to the standard demonstrates to customers, partners, and regulators that an organization follows internationally accepted best practices for managing information security risk. More than a checklist, ISO 27001 functions as an ongoing management framework that integrates security into every level of organizational decision-making, helping build trust, resilience, and long-term operational stability.

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Episode 64 — A.8.21–8.22 — Security of network services; Segregation of networks

Framework - ISO 27001 (Cyber)

13 minutes

2 months ago

Episode 64 — A.8.21–8.22 — Security of network services; Segregation of networks

A.8.21 requires that network services—whether internal or provided by third parties—be specified and secured to meet business and security requirements. For the exam, think beyond raw connectivity: services include routing, switching, DNS, DHCP, VPN, load balancing, DDoS protection, and content filtering. Contracts and internal SLAs should define availability, performance, logging, change processes, and security features such as encryption, authentication, and isolation. Verification mechanisms—service acceptance tests, periodic reviews, and independent assessments—ensure the service continues to meet expectations as environments evolve. Candidates should note integration points with supplier governance and incident management, including defined contacts, escalation paths, and evidence access for investigations. The objective is transparency and control: you must know what the service does, how it is secured, and how you will detect and respond when something goes wrong.

A.8.22 focuses on segregation of networks, a structural defense that limits the spread of threats and enforces policy boundaries. Segregation can be physical (separate hardware) or logical (VLANs, VRFs, SDN microsegmentation), and should map to data sensitivity, system criticality, and exposure. Controls include deny-by-default interzone policies, authenticated proxies for cross-zone access, and brokered connections for administrative functions. Monitoring validates that segmentation works, detecting forbidden flows and policy drift. Pitfalls include “any-any” rules added for expedience, shared management planes, and overlooked paths such as backup networks or out-of-band consoles that bypass controls. Effective programs document zoning standards, maintain up-to-date network diagrams, and require explicit risk acceptance for exceptions with expiry and review. Candidates should be prepared to describe how service security and segregation combine: secure, well-specified services run inside clearly bounded segments, with least-privilege pathways and auditable crossings that align to zero-trust goals and simplify both operations and audits. Produced by BareMetalCyber.com, where you’ll find more cyber audio courses, books, and information to strengthen your educational path. Also, if you want to stay up to date with the latest news, visit DailyCyber.News for a newsletter you can use, and a daily podcast you can commute with.