Exam AWS Certified Solutions Architect - Professional topic 1 question 128 discussion

This is NOT a limitation. You can purchase and use Reserved Instances with dedicated tenancy. AWS allows you to purchase dedicated Reserved Instances to help reduce costs when using dedicated instances for longer terms.

D. The EBS volume will not be on the same tenant hardware as the EC2 instance though the user has configured dedicated tenancy.

D: When you launch a Dedicated Instance backed by Amazon EBS, the EBS volume doesn't run on single-tenant hardware. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/dedicated-instance.html#dedicated-limits

B is the correct answer. All other answers are true limitations of dedicated tenancy VPCs. A- All instances are dedictaed by definition C- Cannot use reserved D- EBS is not on the same HW

It seems a questionable question. Only D is a valid statement within the answers, and it seems not related to any limitation.

A. All instances launched with this VPC will always be dedicated instances and the user cannot use a default tenancy model for them. -False, unless you flag the VPC as "Dedicated", which this question might be asking in a poorly worded fashion. B. It does not support the AWS RDS with a dedicated tenancy VPC. - Possibly. RDS can support Dedicated but the EC2 instance type has to be compatible. C. The user cannot use Reserved Instances with a dedicated tenancy model.- False, you can use Dedicated RI. D. The EBS volume will not be on the same tenant hardware as the EC2 instance though the user has configured dedicated tenancy. -This is a true statement

C. The user cannot use Reserved Instances with a dedicated tenancy model.

C and D both invaid. https://docs.aws.amazon.com/ja_jp/AWSEC2/latest/UserGuide/dedicated-instance.html

A. Its a negative question. Option A is incorrect. You can reserve dedicated EC2 instances

It is C. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/dedicated-instance.html To guarantee that sufficient capacity is available to launch Dedicated Instances, you can purchase Dedicated Reserved Instances.

The answer is D. References: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/dedicated-instance.html "When you launch an Amazon EBS-backed Dedicated Instance, the EBS volume doesn't run on single-tenant hardware."

Be attention, this is "not" question.

Answer is B https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/dedicated-instance.html

Answer is C