Exam AWS-SysOps topic 1 question 732 discussion

Exam question from Amazon's AWS-SysOps

Question #: 732
Topic #: 1

A company uses multiple accounts for its applications. Account A manages the company's Amazon Route 53 domains and hosted zones. Account B uses a load balancer fronting the company's web servers.
How can the company use Route 53 to point to the load balancer in the MOST cost-effective and efficient manner?

A. Create an Amazon EC2 proxy in Account A that forwards requests to Account B.
B. Create a load balancer in Account A that points to the load balancer in Account B.
C. Create a CNAME record in Account A pointing to an alias record for the load balancer in Account B.
D. Create an alias record in Account A pointing to the DNS name for the load balancer in Account B.

Show Suggested Answer

Suggested Answer: D 🗳️
Reference:
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-to-elb-load-balancer.html

by MrKhan at June 2, 2020, 6:19 p.m.

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waterzhong

Highly Voted 2 years, 8 months ago

D Alias records are best used for routing to an AWS Resource As a good reminder: A record = URL to IPv4 AAAA record = URL to IPv6 CNAME record = URL to URL (All the same, one url = Many URL's) Alias record = AWS service

upvoted 12 times

billcayman

2 years, 8 months ago

Good reminder, thank you.

upvoted 3 times

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albert_kuo

Most Recent 11 months, 3 weeks ago

Selected Answer: D

By creating an alias record in Account A that points directly to the DNS name of the load balancer in Account B, you can achieve efficient and cost-effective routing. This method leverages Route 53's alias functionality, which allows you to create a DNS record that behaves like a CNAME record but has the performance benefits of an A record.

upvoted 1 times

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RicardoD

2 years, 8 months ago

D is the answer create an ALIAS record in account A that points do to ALB on Account B

upvoted 2 times

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Kimle

2 years, 8 months ago

it's C .. you can't have alias record in your account to point at a service in other account , so CNAME in account A will point to Alias in account B which can point to a service "ALB"

upvoted 1 times

Kimle

2 years, 8 months ago

Sorry it's D , as kopper2019 mentioned below article is useful https://stackoverflow.com/questions/35928471/cross-account-alias-records

upvoted 1 times

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2 years, 9 months ago

I think it is C, The main point is that the resource is in a different account. I don't think you can create an alias record for a resource not in your account.

upvoted 3 times

jaribu

2 years, 9 months ago

CNAME — Canonical name The fully qualified domain name (for example, www.example.com) that you want Route 53 to return in response to DNS queries for this record. A trailing dot is optional; Route 53 assumes that the domain name is fully qualified. This means that Route 53 treats www.example.com (without a trailing dot) and www.example.com. (with a trailing dot) as identical.

upvoted 2 times

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