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1. What is an ACL?
Answer: ACL stands for Access Control List, which is a set of rules used to control access to network resources.

2. What is the purpose of an ACL?
Answer: The purpose of an ACL is to control who can access network resources and what actions they can perform on those resources.

3. How does an ACL work?
Answer: An ACL works by filtering traffic based on rules that specify which packets are allowed or denied based on criteria such as source and destination IP addresses, ports, and protocols.

4. What are the types of ACLs supported by Alibaba Cloud?
Answer: Alibaba Cloud supports both network ACLs and security group ACLs.

5. What is a network ACL?
Answer: A network ACL is a set of rules that control traffic flow at the network level.

6. What is a security group ACL?
Answer: A security group ACL is a set of rules that control traffic flow at the instance level.

7. How are network ACLs and security group ACLs different?
Answer: Network ACLs control traffic flow at the network level, while security group ACLs control traffic flow at the instance level.

8. How do you create a network ACL on Alibaba Cloud?
Answer: You can create a network ACL on Alibaba Cloud by using the VPC console or the Alibaba Cloud API.

9. How do you create a security group ACL on Alibaba Cloud?
Answer: You can create a security group ACL on Alibaba Cloud by using the ECS console or the Alibaba Cloud API.

10. What are the basic components of an ACL rule?
Answer: The basic components of an ACL rule are the source and destination IP addresses, ports, and protocols.

11. What is the difference between a permit rule and a deny rule?
Answer: A permit rule allows traffic to pass through the ACL, while a deny rule blocks traffic from passing through the ACL.

12. Can you create custom ACL rules on Alibaba Cloud?
Answer: Yes, you can create custom ACL rules on Alibaba Cloud.

13. How do you modify an ACL rule on Alibaba Cloud?
Answer: You can modify an ACL rule on Alibaba Cloud by using the VPC console or the Alibaba Cloud API.

14. How do you delete an ACL rule on Alibaba Cloud?
Answer: You can delete an ACL rule on Alibaba Cloud by using the VPC console or the Alibaba Cloud API.

15. Can you prioritize ACL rules on Alibaba Cloud?
Answer: Yes, you can prioritize ACL rules on Alibaba Cloud.

16. How do you prioritize ACL rules on Alibaba Cloud?
Answer: You can prioritize ACL rules on Alibaba Cloud by changing the order in which they are listed.

17. What is an ACL policy?
Answer: An ACL policy is a collection of ACL rules that are applied to a network or instance.

18. How do you apply an ACL policy on Alibaba Cloud?
Answer: You can apply an ACL policy on Alibaba Cloud by associating it with a VPC or security group.

19. Can you apply multiple ACL policies to a single network or instance?
Answer: Yes, you can apply multiple ACL policies to a single network or instance.

20. How do you troubleshoot ACL issues on Alibaba Cloud?
Answer: You can troubleshoot ACL issues on Alibaba Cloud by reviewing the ACL logs and using the Alibaba Cloud support resources.