多项选择题 Which three applications are disabled for compression by default?（） (Choose three.)

单项选择题 Click the Exhibit button. In the exhibit, the Compression > Basic > Endpoints page shows an icon of a red "X" under the tunnel status "IN" column. The error message displays, "No Request Received". What does this indicate?（）

多项选择题 What are two reasons why a device will fail to register to a community? （）(Choose two.)