The following statement about STP is correct. ______. (Multiple choice)

On the MSR router, if you want to completely delete an obsolete file in the recycle bin, you can execute the ______ command.

The network administrator of a company needs to set a subnet mask to divide the Class C network 211.110.10.0 that he is responsible for into 14 subnets. Each subnet is required to contain as many hosts as possible, so he should use a subnet mask of _____ bits code. (Please fill in Arabic numerals)

To set a subnet mask so that 192.168.0.94 and 192.168.0.116 are in the same network segment, the subnet mask used may be ______.

When the source host pings the destination device, if the network works normally, the destination device will respond to the source host with an ICMP_____ packet after receiving the message.