Which two logical router components span across all transport nodes? (Choose two.)
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A. B. C. D. E.BD.
https://theoverlays.com/2018/12/19/nsx-t-logical-routers/The correct answers are B. DISTRIBUTED_ROUTER_TIER0 and D. DISTRIBUTED_ROUTER_TIER1.
Explanation:
In VMware NSX-T Data Center, logical routers provide routing and gateway services for virtual networks. A logical router consists of multiple logical router components that are deployed on transport nodes, which are the hypervisors or hosts that provide network virtualization services.
There are two types of logical routers in NSX-T Data Center: Tier-0 and Tier-1 routers. Tier-0 routers are the top-level routers that connect to external networks and provide connectivity to Tier-1 routers. Tier-1 routers provide connectivity to virtual machines and other logical switches within a virtual network.
Both Tier-0 and Tier-1 routers have two types of logical router components: service router and distributed router.
Service Router Components: A service router component is deployed on a transport node that provides centralized services, such as NAT, VPN, and load balancing, for the logical router. Service router components are specific to a logical router and do not span across transport nodes.
Distributed Router Components: A distributed router component is deployed on every transport node that is part of a logical router's transport zone. Distributed router components provide distributed routing and gateway services, which enable traffic to be forwarded between virtual machines and between virtual machines and external networks.
Both Tier-0 and Tier-1 distributed router components span across all transport nodes that are part of their respective transport zones, making them the correct answers to this question.
Option A, SERVICE_ROUTER_TIER0, is incorrect because it refers to a service router component specific to a Tier-0 router, which does not span across transport nodes.
Option C, SERVICE_ROUTER_TIER1, is incorrect for the same reason as option A.
Option E, TIER0_DISTRIBUTED_ROUTER, is not a valid logical router component in NSX-T Data Center. The correct naming convention is DISTRIBUTED_ROUTER_TIER0.