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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

EC2 instances in a private subnet use the Amazon-provided DNS resolver at the VPC-base-plus-2 address. After their default security group is replaced with one that denies all egress unless explicitly allowed, the instances can still reach public IPs over HTTPS but can no longer resolve domain names. Which minimal egress rule should the security engineer add to restore DNS functionality while following the principle of least privilege?

  • Permit outbound UDP traffic on port 123 to the VPC DNS resolver's IP address only

  • Permit outbound TCP traffic on port 53 to 0.0.0.0/0

  • Permit outbound UDP and TCP traffic on port 53 to the VPC DNS resolver's IP address only

  • Permit outbound UDP traffic on ports 67 and 68 to the VPC DNS resolver's IP address only

ISC2 Systems Security Certified Practitioner (SSCP)
Network and Communication Security
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