September 14, 2021 by Admin
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.)
- Your NACL is blocking UDP port 53 outbound
- Your security group is blocking port 53 inbound
- Your NACL is blocking TCP port 53 outbound.
- Your on-premises firewall is blocking port 443
DNS requires TCP and UDP port 53.