ANS-C01 Network Implementation Practice Question
Which THREE of the following are valid considerations when designing a multi-VPC architecture using AWS Transit Gateway? (Choose three.)
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that Transit Gateway does not support multicast at all, when in fact it does support it with specific configuration requirements, and the trap with overlapping CIDRs is that candidates assume route tables can resolve conflicts, but Transit Gateway requires unique CIDRs across all attached VPCs for proper routing.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
You can route internet-bound traffic from multiple VPCs through a single shared VPC with a NAT gateway.
AWS Transit Gateway allows you to centralize internet-bound traffic by routing it from multiple VPCs through a single shared VPC that contains a NAT gateway. This design reduces costs and simplifies management by avoiding the need for a separate NAT gateway in each VPC, as the Transit Gateway can propagate routes to direct traffic to the shared VPC's NAT gateway for egress to the internet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
You can route internet-bound traffic from multiple VPCs through a single shared VPC with a NAT gateway.
Why this is correct
Centralized NAT via Transit Gateway routing.
- ✗
Transit Gateway does not support multicast traffic.
Why it's wrong here
Transit Gateway supports multicast (with appropriate configurations).
- ✓
You can use separate route tables to isolate traffic between different VPCs.
Why this is correct
Route tables allow segmentation of traffic.
- ✗
VPCs attached to the same Transit Gateway can have overlapping CIDR blocks.
Why it's wrong here
Overlapping CIDRs cause routing ambiguity.
- ✓
You can attach a Direct Connect Gateway to a Transit Gateway for hybrid connectivity.
Why this is correct
Direct Connect Gateway can be associated with Transit Gateway.
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Same concept, more angles
1 more way this is tested on ANS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which THREE of the following are features of AWS Transit Gateway? (Select THREE.)
medium- ✓ A.Multicast support
- B.Built-in NAT capabilities
- ✓ C.Transitive routing between multiple VPCs
- ✓ D.Centralized routing and management
- E.Edge-to-edge routing for VPN connections
Why A: AWS Transit Gateway supports multicast traffic by acting as a multicast router within a VPC, enabling you to send a single stream of data to multiple receivers across different VPCs. This is achieved through the creation of a multicast domain and the association of subnets as sources or members, using IGMPv2 for group membership management.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.