Oracle Cloud Infrastructure 2020 Architect Associate — Question 4

You created a public subnet and an internet gateway in your virtual cloud network (VCN) of Oracle Cloud Infrastructure. The public subnet has an associated route table and security list. However, after creating several compute instances in the public subnet, none can reach the Internet.
Which two are possible reasons for the connectivity issue? (Choose two.)

Answer options

• A. The route table has no default route for routing traffic to the internet gateway.
• B. There is no stateful egress rule in the security list associated with the public subnet.
• C. There is no dynamic routing gateway (DRG) associated with the VCN.
• D. There is no stateful ingress rule in the security list associated with the public subnet.
• E. A NAT gateway is needed to enable the communication flow to internet.

Correct answer: A, D

Explanation

Option A is correct because without a default route in the route table pointing to the internet gateway, instances cannot reach the Internet. Option D is also correct since lacking a stateful ingress rule in the security list would block incoming traffic, preventing connections to the instances. Options B, C, and E are not the correct answers as they do not directly cause the instances to lose Internet connectivity in this scenario.