Through sR (Segment Routing), an explicit path can be easily defined. The nodes in the network only need to maintain the SegmentRouting information to cope with the real-time and rapid development of the business. What are the following characteristics of Segment Routing?

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

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

What is the total length of the VLAN frame format defined by IEEE802.1Q?

The Layer 2 switch is a data link layer device, which can identify the MAC address information in the data frame, forward data according to the MAC address, and record these MAC addresses and corresponding port information in its own MAC address table.