Three Functions of a Tier-0 Gateway

CDF.

In a multi-tenant service provider environment, a Tier-0 Gateway provides a centralized point of connectivity to the physical network infrastructure and offers routing and security services to the connected Tier-1 Gateways.

The three functions of a Tier-0 Gateway are:

A. Acts as a default gateway for the tenant workloads: Tier-0 Gateway serves as a default gateway for all the tenant workloads, allowing them to communicate with other virtual machines (VMs) in the same or different subnets within the same virtual network. It also provides connectivity to external networks and the internet.

E. Provides first-hop routing for the tenant workloads: Tier-0 Gateway offers first-hop routing services to the tenant workloads. It is responsible for routing the traffic from the VMs to their destination, whether it is to another VM in the same subnet or to an external network.

F. Enables north-south connectivity to the tenant workloads: Tier-0 Gateway provides north-south connectivity to the tenant workloads, allowing them to communicate with external networks and the internet. It performs network address translation (NAT) and firewalling services to secure the traffic flowing in and out of the virtual network.

Therefore, the correct answers to the question are A, E, and F.

To provide more context, Tier-0 Gateway also interconnects the Tier-1 Gateways of multiple tenants (option C). It allows multiple tenants to have their own isolated virtual networks, which can be connected to a shared physical network through the Tier-0 Gateway. Additionally, Tier-0 Gateway provides isolation between the tenants (option D) by ensuring that the traffic from one tenant does not interfere with the traffic of other tenants.

Tier-0 Gateway plays a crucial role in providing connectivity and security in a multi-tenant service provider environment.