Three Layer 2 switches are interconnected with one HUB. The switches are all enabled with STP bridge ID. Refer to the figure below. What are the default errors of other configurations? () (Single-choice question)

On which layer of the OSI reference model does the Ethernet switch work?

Which parameter is used in the spanning tree protocol for root bridge election?

The network administrator hopes to be able to effectively use the P address of the
192.168.176.0/25 network segment. Now that the company's marketing department has 20 hosts, which of the following address segments is best allocated to the marketing department? ()

At what percentage does the DHCP client send the lease renewal message for the first time? ()