ISC2 Systems Security Certified Practitioner (SSCP) Practice Question
Your company runs an Auto Scaling group of Linux EC2 instances spread across two Availability Zones. Each instance must read and update a shared set of small configuration files at boot time and during operation. The files need to persist if instances are replaced, remain accessible only inside the VPC, and require minimal management. Which AWS virtual storage solution best meets these needs?
Store the files in an Amazon S3 bucket and mount it on the instances with an s3fs FUSE driver
Create a single General Purpose SSD (gp3) Amazon EBS volume and attach it to the launch template for the Auto Scaling group
Use instance store volumes on each EC2 instance to hold the configuration files locally
Attach an Amazon Elastic File System (EFS) file system and mount it on each instance using NFSv4
Amazon EFS provides a fully managed, POSIX-compatible, shared file system that can be mounted on many EC2 instances across multiple Availability Zones. Because the file system is network-attached rather than instance-attached, data persists independently of any single instance and remains available when instances scale in or out. EFS supports encryption at rest and in transit and resides inside the VPC, satisfying security requirements without the administrative overhead of manually replicating or syncing data.
Instance store volumes are ephemeral and lost when an instance stops or terminates. Mounting Amazon S3 with s3fs offers durability but lacks native POSIX file-system semantics and requires extra tooling to handle consistency and permissions. An EBS volume can attach to only one EC2 instance at a time (unless used via EFS-backed FSx for Lustre or EBS Multi-Attach with limits), so it cannot be shared concurrently by all instances. Therefore, Amazon EFS is the most appropriate choice.
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What is Amazon EFS and how does it differ from other storage options like Amazon S3 and Amazon EBS?
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What is NFSv4, and why is it used with Amazon EFS?
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Why are instance store volumes not suitable for persistent storage in Auto Scaling groups?
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ISC2 Systems Security Certified Practitioner (SSCP)
Systems and Application Security
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