A full-mesh SD-WAN topology allows each site to establish direct overlays with every other site, minimizing the number of hops and avoiding backhauling through a central hub, thereby delivering the lowest latency paths between Asia, Europe, and the US.

Runbooks provide step-by-step troubleshooting procedures, and a solid knowledge base captures known issues and resolutions. Together they let new team members ramp up quickly and resolve common network problems with minimal hand-holding.

Comprehensive and Detailed Explanation From Exact Extract:
D includes all the key elements of Zero Trust:
* MFA (Multi-Factor Authentication) supports secondary passkey-based authentication.
* Geolocation settings enforce geo-restrictions.
* SSO federation allows use of an existing SAML identity provider.
* Continuous access policies support dynamic reauthentication based on changes in posture.
* Trusted endpoint policies ensure only corporate-owned, compliant devices are allowed to connect.
Relevant Extract from CompTIA CloudNetX CNX-001 Study Guide - under "Zero Trust Architecture and Identity Management":
"ZTA enforces continuous access policies that monitor session state, posture, and user behavior."
"Federated identity with SSO and posture-based trust evaluation are core ZTA components."
"Geo-restrictions and trusted endpoint policies limit exposure and enforce device compliance." Other options:
* A uses static session tokens and disables timely expiration, violating Zero Trust principles.
* B allows BYOD and disables auditing, which conflicts with compliance and monitoring.

Comprehensive and Detailed Explanation From Exact Extract:
A: An explicit allow rule in the Network Security Group (NSG) permitting Server A (10.2.3.9) to communicate with Server B (10.2.2.7) ensures intra-cloud communication between segments.
C: A deny rule that blocks any inbound access from external sources (0.0.0.0/0 # internal range 10.2.0.0/16) effectively prevents unsolicited inbound traffic from the public internet, securing the internal servers.
Relevant Extract from CompTIA CloudNetX CNX-001 Study Guide - under "Cloud Security Groups and Firewall Policies":
"NSGs should be configured with least privilege principles. Allow intra-subnet or intra-application communication while explicitly denying unsolicited internet traffic."
"Ingress and egress filtering policies should block all traffic by default and permit only what's required." Other options:
* B. Incorrect - this allows internal range to internet, which is not requested.
* D & E. Apply to outbound policies, not relevant to the need to block inbound external access.
* F. Incorrect - this denies internal resources from going outbound, not inbound protection.

Comprehensive and Detailed Explanation From Exact Extract:
Runbooks and knowledge base articles provide step-by-step instructions for resolving common issues, helping new employees quickly become productive with minimal supervision. These documents can be updated as new issues arise and serve as a foundational training and operational resource.
Relevant Extract from CompTIA CloudNetX CNX-001 Study Guide - under "Operational Documentation and Knowledge Transfer":
"Runbooks contain standardized procedures for handling recurring operational tasks. Knowledge base articles enable consistent troubleshooting and resolution with minimal oversight." Other options:
* A. A Statement of Work (SOW) is used for defining project deliverables, not training.
* C. Network diagrams are useful for understanding architecture, but not for operational procedures.
* D. A mentor program can help, but it doesn't scale or provide immediate troubleshooting steps.