In cloud networking, what is the purpose of virtual networks and security boundaries?

• A. Security boundaries unify all tenants' traffic
• B. Virtual networks segment resources; security boundaries control traffic and isolate tenants
• C. Virtual networks remove security, boundaries are redundant
• D. Cloud networking uses only flat networks

Answer: (B)

The main idea here is that cloud networking uses virtual networks to divide resources into separate, isolated spaces, and security boundaries to govern what traffic can cross between those spaces and between tenants. Virtual networks create isolated segments so resources inside one segment can communicate with each other, while remaining hidden from or restricted from other segments. Security boundaries implement access controls and firewall rules that regulate traffic, ensuring only allowed connections exist and that tenants stay isolated from one another. This combination enables a secure, multi-tenant environment where each tenant has its own network space and strict traffic controls prevent cross-tenant access. The other options contradict this: unifying all tenants’ traffic would break isolation, removing security and claiming boundaries are redundant ignores basic protection, and flat networks ignore the need for segmentation.