Detailed Explanation:In a Layer 2 WLAN, an Access Controller (AC) typically handles authentication and management but does not act as a gateway. Instead, a Layer 3 device, such as a router, serves as the gateway.
(Reference: HCIA-WLAN Training Material, WLAN Layer 2 and Layer 3 Concepts)

Given correct configuration, hosts within the same subnet should be able to communicate, so the host at
10.0.12.1 can ping the host at 10.0.12.2. This scenario assumes correct interconnectivity and absence of firewall or ACL rules that would block the communication.

* Device Interconnection Requirements:
* Device interconnection (such as point-to-point links) requires only two IP addresses: one for each device.
* A subnet mask of /30 (255.255.255.252) provides four total addresses (2 usable, 1 network, 1 broadcast).
* Efficiency:
* Using a /30 subnet avoids wasting IP addresses, making it ideal for point-to-point links.
* Why Other Options Are Incorrect:
* B (32): /32 is used for single-host IP addresses, not links.
* C (24): /24 is excessive for point-to-point links, providing 254 usable addresses.
* D (16): /16 provides 65,534 addresses, which is highly inefficient.
References: HCIA-Datacom V1.0 Certification Guide, Chapter 3: IP Addressing.