In the network shown in the figure below, host A logs in to router A through Telnet, and then obtains the configuration file of router B through FTP on the remote interface. How many TCP connections exist on router A at this time?

When Huawei switches allow STP, the priority of the switch is by default:

According to the command shown in the figure, which of the following description is correct? (Multiple choice )

There is no channel overlap in the 14 available frequency bands in the 2.4GHz frequency band.

Which fields in the IPv4 header are related to fragmentation? (Multiple Choice)