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)

The command to configure the bridge priority of the switch SWA to 0 is ______.

The number of available host addresses contained in the natural classification network segment corresponding to the IP address 165.110.20.67 is. (Please fill in Arabic numerals)

Which of the following statements about HDLC is correct is ______. (Multiple choice)

In the process of tearing down the TCP connection as shown in the figure, the X part of the ACK should be filled with ______.