※觀看影片請點擊影片名稱後方的"YOUTUBE"或"YOUKU",
觀看YOUKU影片,請輸入密碼:mooc01004
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3.10. Please fill in the number for the “active scanning” steps of a node to select an AP in IEEE 802.11 wireless LAN.
主動掃描(active scanning)是802.11無線區域中,節點去選擇AP的過程。請在下列主動掃描步驟中,填入名詞的編號。
(1) 信標 (a Beacon) (2) 信標回應 (a Beacon response)
(3) 探測 (a probe) (4) 探測回應 (a probe response)
(5) 連接要求 (an association request) (6) 連接回應 (an association response)
(7) 輪詢 (a poll) (8) 輪詢回應 (a poll response)
Step1. The node sends __A__ frame 節點會送出一個 ___A__ 訊框。
Step 2. All APs within reach reply with __B__ frame
所有AP會回傳一個 ___B___ 訊框。
Step 3. The node selects one of the APs and sends that AP __C__ frame
節點會從所有AP中選擇其中一個AP,然後送給AP一個 ___C___ 訊框。
Step 4. The AP replies with ___D___ frame
AP會再回傳一個 ___D___ 訊框。
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3.11. Please fill in the number for the “passive scanning” steps of a node to select an AP in IEEE 802.11 wireless LAN.
被動掃描 (passive scanning) 是802.11無線區域中,節點去選擇AP的過程。請在下列被動掃描步驟中,填入名詞的編號。
(1) 信標 (a Beacon) (2) 信標回應 (a Beacon response)
(3) 探測 (a probe) (4) 探測回應 (a probe response)
(5) 連接要求 (an association request) (6) 連接回應 (an association response)
(7) 輪詢 (a poll) (8) 輪詢回應 (a poll response)
Step1. The APs periodically send __A___ frame
AP 會定期的發送 ___A___ 訊框。
Step 2. A node can change to an AP by sending it __B__ frame back to the AP
節點可以透過傳送 ___B___ 訊框,來切換 AP。
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