2V0-41.24 Question 146
Single answerA company has deployed a multitier application with Web, Application, and Database tiers in an NSX-T Data Center environment. The Web and Application tiers are on separate logical segments, while the Database tier resides in a different VLAN-backed segment. The company wants traffic to flow between these tiers efficiently using NSX-T routing. What happens when a Web-tier VM communicates with a Database-tier VM?
- A
The traffic is routed locally on the Tier-1 Gateway and sent directly to the Database-tier segment.
- B
The traffic is routed from the Tier-1 Gateway to the Tier-0 Gateway before being forwarded to the Database-tier segment.
- C
The traffic is routed within the same Tier-1 Gateway, but the return traffic must pass through the Tier-0 Gateway.
- D
The traffic is routed locally between the Web and Application tiers on the Tier-1 Gateway, but reaches the Tier-0 Gateway when accessing the Database-tier VLAN segment.
Show answer and explanation
Correct answer: D
Explanation
In NSX-T multitier routing, logical segments connected to a single Tier-1 Gateway allow local routing for efficient east-west traffic flow between VMs in those segments. However, traffic destined for VLAN-backed segments, which are typically connected to Tier-0 Gateways, must traverse the Tier-0 Gateway to communicate. This ensures proper routing between logical and physical network segments.
- A. Incorrect.
Incorrect: Traffic destined for the Database-tier VLAN segment must traverse the Tier-0 Gateway because VLAN-backed segments are typically managed by the Tier-0 Gateway in NSX-T.
- B. Incorrect.
Incorrect: The Tier-1 Gateway does not forward all traffic to the Tier-0 Gateway unless the destination resides outside the NSX-T logical constructs, like a VLAN-backed segment.
- C. Incorrect.
Incorrect: NSX-T does not require return traffic to traverse different paths, as routing decisions are symmetrical unless special policies (e.g., NAT) are configured.
- D. Correct.
Correct: Traffic between Web and Application tiers is routed locally on the Tier-1 Gateway. However, when traffic is destined for the Database-tier VLAN segment, it must traverse the Tier-0 Gateway as VLAN-backed segments are typically handled by the Tier-0 Gateway.