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Question 100 - ANS-C00 discussion

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You have a hybrid environment in which your VPC queries your on-premises DNS server for up resources in your environment. The EC2 instances in your VPC are unable to resolve on-premises resources. What are two possible reasons for this problem? (Choose two.)

A.
Your NACL is blocking UDP port 53 outbound
Answers
A.
Your NACL is blocking UDP port 53 outbound
B.
Your security group is blocking port 53 inbound
Answers
B.
Your security group is blocking port 53 inbound
C.
Your NACL is blocking TCP port 53 outbound.
Answers
C.
Your NACL is blocking TCP port 53 outbound.
D.
Your on-premises firewall is blocking port 443
Answers
D.
Your on-premises firewall is blocking port 443
Suggested answer: A, C

Explanation:

Explanation:

DNS requires TCP and UDP port 53.

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asked 16/09/2024
Andrea Ciovati
41 questions
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