Guide: Answering Questions on Subnets in Amazon VPC for the AWS Solution Architect exam
What is a Subnet? - Importance
A subnet, or subnetwork, is a division of a network where you can allocate a part of the IP address range of your network to a subnetwork. In Amazon VPC, a subnet functions the same way, allowing users to divide their VPC's IP address range into different ranges, each representing a different subnet.
Subnets are critically important because they provide better organization, security, and traffic management within a VPC. Having subnets allows us to isolate system parts from one another, thereby limiting the impacts of potential faults, and making the system more reliable.
How It Works
Each subnet you create is linked to an Availability Zone, thereby increasing fault tolerance and low latency. It's recommendable to establish multiple subnets in different availability zones to ensure system reliability and fault tolerance.
Exam Tips: Answering Questions on Subnets
1. Understand the purpose and function of a subnet: This is key to answering all subnet-related questions. Know when and why you would use a subnet within a VPC.
2. Familiarize yourself with default and non-default VPCs and subnets: AWS creates a default VPC and subnet for users to use right away. A default VPC has a size /16 IPv4 CIDR block, and each default subnet has a size /20 default IPv4 CIDR block. Understanding the differences can help you answer the questions.
3. Know how to calculate the number of subnets: Questions may ask you to calculate how many subnets or hosts-per-subnet can be created within a CIDR block. Remember, the number of subnets depends on the number of bits borrowed to identify the subnet.
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Subnets practice test
Subnets are smaller, individual sections of a VPC IP address range partitioned into different availability zones for redundancy and fault tolerance. They segregate network traffic, allowing for better application performance and security. Subnets can be either private or public, depending on whether they have direct access to the internet via an Internet Gateway (IGW). While private subnets only allow internal access, public subnets can be accessed from the internet.
Time: 5 minutes Questions: 5
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AWS Certified Solutions Architect - Associate Preparation Package (2024)
- 2685 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