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Answer D is the technically correct selection. Badge readers on data-center doors are physical access control. They regulate who can enter protected spaces based on identity, role, and authorization. This aligns with Cisco CCNA 200-301 v1.1 because the exam blueprint requires engineers to recognize operational behaviour from configuration symptoms and topology requirements. RBAC can influence the policy, biometrics can be a factor, and MFA can strengthen authentication, but the control described is physical facility access. Treat the distractors carefully: most are real Cisco terms, but they solve a different problem or operate at a different layer. The selected answer is the one that would be used by an engineer on the device or in the design to produce the outcome stated in the question.

OSPFv2 neighbors do not form just because two routers can ping each other. Several parameters must agree before adjacency can progress. The interfaces must be in the same IP subnet and OSPF area. Hello and dead intervals must match. Authentication, if configured, must match. Stub-area flags must match, and MTU mismatches can prevent database exchange from completing. Router IDs must be unique, but they do not have to match. OSPF process IDs are locally significant on Cisco IOS, so the process number can differ between neighbors. Network type also matters because it affects DR/BDR election and adjacency behavior. Cisco CCNA v1.1 IP Connectivity includes single-area OSPFv2 configuration and neighbor adjacency requirements. The point of the drag-and-drop is to separate mandatory matching values from values that are local-only or simply need uniqueness. A clean OSPF adjacency requires matching operational parameters on the shared link, not identical router configuration everywhere.

Controller-based networking reduces configuration complexity by centralizing intent, policy, automation, and visibility. In traditional device-by-device management, engineers often log into individual routers, switches, or controllers and repeat similar commands manually. That increases the chance of drift and human error. A controller-based model centralizes key IT functions, exposes APIs, and can push consistent policy or templates across many devices. It does not inherently increase network bandwidth usage, inflate software costs as a technical benefit, or guarantee fewer network failures in every design. The defensible comparison is operational: centralization and automation reduce complexity and lower the probability of inconsistent configuration. Cisco CCNA 200-301 v1.1 Automation and Programmability includes this topic because modern campus and enterprise management platforms, such as Cisco Catalyst Center, are built around controller-based operations. The two correct benefits are reduced configuration complexity and centralization of management functions. That maps to C and D.

A Cisco Wireless LAN Controller centralizes access point management, which is the operational benefit described in option D. In a controller-based WLAN, lightweight APs join the WLC, download configuration, receive policy, and tunnel or switch client traffic according to the deployment model. That removes the need to configure every AP independently, which is exactly the pain point a WLC is designed to solve in enterprise wireless. Option A is backwards because central management normally reduces repeated per-AP configuration. Option B is false because multiple WLANs can use similar authentication methods while still using different SSIDs and policies. Option C is not the best answer because WLCs manage lightweight APs; autonomous APs are independently configured and do not rely on the same controller model. CCNA 200-301 v1.1 Network Access expects candidates to understand controller-based wireless architecture and the role of APs versus WLCs. Reference: Cisco wireless controller and lightweight AP deployment documentation.