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Comprehensive and Detailed In-Depth Explanation:

LACP selects active ports based on priority (lower is better).

Switch A (SWA) has the following priorities:

G0/0/0 → Priority 100

G0/0/1 → Priority 200

G0/0/2 → Priority 300

G0/0/3 → Priority 400

Since only 3 ports can be active, the port with the highest priority number (400) is NOT active.

Thus, G0/0/3 is NOT selected as an active port.

Comprehensive and Detailed Explanation:

Spanning Tree Protocol (STP) prevents switching loops in networks with redundant links by:

Blocking certain links while still maintaining redundancy.

Preventing broadcast storms and MAC table instability.

Reactivating backup links if the primary link fails.

✅ Reference: HCIA-Datacom Switching Guide – STP Loop Prevention

The default Link Aggregation Control Protocol (LACP) system priority on Huawei switches is 32768. This priority helps determine which device takes the active role in link aggregation when multiple switches are involved. A lower value indicates a higher priority for managing the aggregated link​.