The correct fill-in answer is VPN gateway . In Huawei Cloud Stack networking, an EIP can be associated not only with an individual ECS, but also with shared-access components that serve multiple backend resources. Huawei documentation clearly states that when multiple cloud servers in a subnet need outbound Internet access, they can use a NAT gateway and share an EIP . Huawei’s ELB documentation also reflects the model where a load balancer exposes services externally on behalf of multiple backend ECSs.

In the same family of network services, a VPN gateway is another gateway-type object that uses public-facing connectivity to provide secure access for multiple private-side resources. That is why the exam sentence groups it with load balancer and NAT gateway . The logic is that these service gateways allow multiple ECSs or private resources to make use of a single public-facing IP resource instead of requiring one EIP per server. Huawei’s VPN service documentation also shows VPN as the gateway-based service for secure site-to-cloud communication.