DCN scan be classified into underlay and overlay networks by function. The SDN controller can use VXLAN to construct overlay networks.

DCs are classified into four tiers based on the TIA-942 standard: Tier l, Tier II, Tier III, and Tier IV.
Which of the following is the availability requirement of Tier IV?

Products supported in the Service Center include the Elastic Cloud Server (ECS), image, Auto Scaling (AS), Elastic Volume Service (EVS), Virtual Private Cloud (VPC), Elastic IP address (EIP), Elastic Load Balance (ELB), and security group.

Huawei Fusion Server X6000 is a high-density server provided for the scale-up architecture of DCs. Based on the space and investment restrictions facing DCs, it provides optimized density design, thereby improving DC space utilization and return on investment. Huawei FusionServer X6000 is applicable to multiple service scenarios such as cloud computing, web-based applications, and high-performance computing.

Which of the following is not an interconnection network between multiple DCs?