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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 135 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 135
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company deploys an internal website behind an Application Load Balancer (ALB) in a VPC. The VPC has a CIDR block of 172.31.0.0/16. The company creates a private hosted zone for the domain example.com for the website in Amazon Route 53. The company establishes an AWS Site-to-Site VPN connection between its office network and the VPC.

A network engineer needs to set up a DNS solution so that employees can visit the internal webpage by accessing a private domain URL (https://example.com) from the office network.

Which combination of steps will meet this requirement? (Choose two.)

  • A. Create an alias record that points to the ALB in the Route 53 private hosted zone.
  • B. Create a CNAME record that points to the ALB internal domain in the Route 53 private hosted zone.
  • C. Create a Route 53 Resolver inbound endpoint. On the office DNS server, configure a conditional forwarder to forward the DNS queries to the Route 53 Resolver inbound endpoint.
  • D. Create a Route 53 Resolver outbound endpoint. On the office DNS server, configure a conditional forwarder to forward the DNS queries to the Route 53 Resolver outbound endpoint.
  • E. On the office DNS server, configure a conditional forwarder for the private domain to the VPC DNS at 172.31.0.2.
Show Suggested Answer Hide Answer
Suggested Answer: AC 🗳️
by ryluis at June 10, 2023, 7:45 a.m.
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Certified101
Highly Voted 1 year, 10 months ago
Selected Answer: AC
AC is correct - why would you select A & B ? makes no sense, Alias records are free for AWS resources, you would get charged for lookups for CNAME records.
upvoted 7 times
Tofu13
1 year, 9 months ago
Also, u can't create a CNAME record that has the same name as the hosted zone (the zone apex). So B is out.
upvoted 2 times
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Pratap
Highly Voted 2 years ago
Selected Answer: AC
Alias record in Route 53 and conditional forwarding from on premise DNS to INBOUND endpoint
upvoted 5 times
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46f094c
Most Recent 5 months, 2 weeks ago
Selected Answer: AC
A- you need an ALIAS record to point to the APEX root example.com B- can't point to the APEX root domain example.com C- You need an inbound endpoint to resolve from the office to AWS D- no, outbound is to resolve from AWS to the office E- even if it works and it's free, I wouldn't use this as it doesn't scale and can't customize rules
upvoted 1 times
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woorkim
6 months, 3 weeks ago
A,C is answer. CNAME is not allowed for same domain name in hosted zone.
upvoted 1 times
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Marfee400704
1 year, 4 months ago
I think that it's correct answer is AC.
upvoted 1 times
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TravelKo
1 year, 11 months ago
Selected Answer: AC
Question is for combination not for various options. So it is AC.
upvoted 2 times
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JosMo
1 year, 11 months ago
Selected Answer: AB
Answer: AC, Can't be AB because you wont create an ALIAS and a CNAME for the same record
upvoted 4 times
JosMo
1 year, 11 months ago
remove my comments please wrong selected answer
upvoted 4 times
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ryluis
2 years ago
Selected Answer: AB
The question doesn't mention any existence of on prem DNS server.
upvoted 4 times
AJ7428
2 years ago
The question clearly mentioned access from the office network, some sort of DNS required at least for forwarding dns query so answer should be AC, where on prem query goes to inbound route 53 resolver.
upvoted 4 times
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tcp22
2 years ago
A and C
upvoted 2 times
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[Removed]
1 year, 11 months ago
AC is correct. CNAME records You can't create a CNAME record that has the same name as the hosted zone (the zone apex). This is true both for hosted zones for domain names (example.com) and for hosted zones for subdomains (zenith.example.com). Ref: https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-choosing-alias-non-alias.html
upvoted 1 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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