CompTIA CloudNetX CNX-001 Question # 4 Topic 1 Discussion

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.

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