A 300-user headquarters needs integrated threat defense, SSL proxy, and application-aware QoE with analytics on its WAN Edge while keeping throughput headroom for growth. Budget requires right-sizing hardware and entitlements upfront. Which sizing decision best aligns platform and licensing to those security and QoE needs?

The correct choice aligns both hardware headroom and entitlement tiers because integrated threat defense plus SSL proxy decryption and application-aware QoE with edge analytics all consume forwarding budget beyond plain routing throughput, so a higher-throughput platform licensed for security and application-experience preserves performance after inspection is enabled and satisfies the upfront right-sizing mandate. The choice sized tightly to present 300-user bandwidth with the full feature set fails on capacity planning conceptually, since enabling decryption, intrusion prevention, antimalware, and deep application visibility substantially lowers effective throughput and leaves no growth margin, causing drops or bypass during peaks despite correct licensing. The choice built around reputation-based filtering with application-experience licensing fails on visibility conceptually, since URL reputation and SNI-based control without full SSL proxy cannot inspect encrypted payloads that now carry most malware and SaaS traffic, leaving integrated defense blind while QoE decisions lack decrypted application context. The choice pairing full security with transport-based path selection and centralized reporting fails on application awareness conceptually, since link metrics and tunnel probes with off-box reports cannot classify applications on the edge or enforce per-application experience policies and local analytics required in the scenario. For exams, distinguish licensed capability from raw bandwidth and remember security throughput is always lower than line rate, so growth must be calculated on inspected throughput. As a practical check, validate the datasheet threat-plus-decryption throughput against peak plus projected growth and confirm the SKU bundle explicitly lists SSL proxy and application QoE analytics entitlements before procurement.