In the network shown in the figure below, two switches are connected by four links, COPPER refers to electrical interface, and FIBER refers to optical interface. Which of the following two interfaces can achieve link aggregation?

In the network shown in the figure below, all routers run OSPF protocol, which device is ABR? (Multiple choice)

Which of the following characteristics does the OSPF protocol have? (Multiple Choice)

The administrator cannot log in to the Huawei router through Telnett, but other administrators can log in normally, so which of the following are the possible reasons? (Multiple Choice)

The IEEE 802.11ac standard only supports the 5GHz frequency band.