Network Address Translation (NAT) Gateway
A Network Address Translation (NAT) Gateway is a highly available, managed service that operates within a single Amazon VPC. It allows EC2 instances within a private subnet to access the internet, while preventing direct inbound access from the internet. NAT Gateway supports IPv4 traffic only and uses a separate Elastic IP address for each NAT Gateway created. It is designed to handle traffic bursts and scale automatically based on the current demand. When you create a NAT gateway, you must specify the VPC and the public subnet it should reside in to be able to route the traffic between the private subnet and the internet. Common use cases for a NAT Gateway include software updates, internet connectivity for private instances, and hybrid cloud architectures.
Guide: Understanding and Answering Questions on Amazon VPC NAT Gateway
Amazon VPC NAT Gateway is a provisioned service that allows instances in private subnets to connect to the internet or other AWS services but prevents the internet from initiating a connection with those instances.
The importance of NAT Gateway is underscored by its capacity to secure an internal network by preventing unsolicited inbound communications.
When processing traffic, NAT Gateway takes an internal IP address and converts it to a public IP address for external communications. For incoming data, it reverses this operation, hence enabling secure connections.
Exam Tips: Answering Questions on Network Address Translation (NAT) Gateway
1. Understand the differences and roles of both NAT Gateway and NAT Instances.
2. Know the workings of NAT Gateway; it allows outbound-only internet access and helps instances in private subnets to connect to the internet.
3. Remember that NAT Gateways are not associated with security groups, but they are with Network ACLs.
4. NAT Gateway supports IPv4 traffic only.
5. Ensure to have well-versed knowledge on topics such as Port Address Translation (PAT) and the difference between static and dynamic NAT.
6. If a question involves private subnet instances requiring Internet connectivity, look for NAT Gateway in the possible answers.
AWS Certified Solutions Architect - Amazon VPC Example Questions
Test your knowledge of Amazon Simple Storage Service (S3)
Question 1
A company is deploying applications in two separate subnets: a public and a private subnet. The company wants its instances in the private subnet to access the internet but prevent unsolicited inbound traffic. Which of the following should be used for this purpose?
Question 2
An organization is building a multi-tier architecture on AWS. The team has concerns about the private subnet's instances' ability to access the internet for software updates. Which of the following solutions will provide the best results?
Question 3
An organization has launched an application with backend databases in a private subnet. The database instances need to download patches from the internet. Which solution ensures that instances can connect to the internet without exposing them to unsolicited traffic?
Go Premium
AWS Certified Solutions Architect - Associate Preparation Package (2024)
- 2203 Superior-grade AWS Certified Solutions Architect - Associate practice questions.
- Accelerated Mastery: Deep dive into critical topics to fast-track your mastery.
- Unlock Effortless AWS Certified Solutions Architect preparation: 5 full exams.
- 100% Satisfaction Guaranteed: Full refund with no questions if unsatisfied.
- Bonus: If you upgrade now you get upgraded access to all courses
- Risk-Free Decision: Start with a 7-day free trial - get premium features at no cost!