Click the Exhibit button. The exhibit shows a 15454/15216 DWDM system and alarm indications. What are two possible sources of trouble shown in the system？（）
請參見圖示。交換機均為默認配置。主機 A 需要與主機 D 通信，但主機 A 沒有其默認網(wǎng)關的 MAC 地址。哪些網(wǎng)絡主機將收到主機 A 發(fā)送的 ARP 請求（）
Refer to the exhibit. LACP has been configured on Switch1 as shown. Which is the correct command set to configure LACP on Switch2？（）
Refer to the exhibit， which shows a PPPoA diagram and partial SOHO77 configuration. Which command needs to be applied to the SOHO77 to complete the configuration？（）
Refer to the exhibit. Look at the command output. What can you use to prevent this behavior？（）
