A. In the Full-mesh topology, if there is a business mutual access relationship between the branch sites of the enterprise, the data will be exchanged directly without going through intermediate nodes.

B. Mainly suitable for small businesses with small sites, or deployed in large enterprises that require collaborative work between branches.

C. Collaborative services, such as high-value applications such as VolP and video conferencing, have very high requirements for network performance such as network packet loss, delay, and jitter.
Therefore, this type of business is more suitable for direct mutual access between branch sites.

D. Full-mesh topology is simple in networking and highly efficient in business access. It is suitable for networks with many branch sites.