The data link layer builds a frame around the network layer data so the necessary checks and controls can be applied. 資料鏈結層在網(wǎng)路層資料之外建立一個(gè)訊框，如此一來(lái)必要的檢查和控制才能被套用。
WAN standards typically describe both physical layer delivery methods and data link layer requirements, including physical addressing, flow control, and encapsulation. 廣域網(wǎng)路標準典型地描述實(shí)體層的傳送方法和資料鏈結層的需求，包括實(shí)體層定址，流量控制和封裝。
Hubs and switches operate at the Data Link Layer. 開(kāi)關(guān)運轉樞紐和數據鏈路層。
To alleviate this, bridging was created to communicate at the data link layer while isolating the physical layer. 為了減輕這個(gè)問(wèn)題，橋接方法被采用，在工工作在物理層的中繼器之基礎上，橋接工作在數據鏈路層。
