HDFS encryption at rest in Hadoop - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is HDFS encryption at rest?

It means protecting data stored in HDFS by encrypting it on disk, so unauthorized users cannot read it even if they access the storage directly.

beginner

Which component manages encryption keys in HDFS encryption at rest?

The Key Management Server (KMS) manages encryption keys securely for HDFS encryption at rest.

intermediate

What is an encryption zone in HDFS?

An encryption zone is a directory in HDFS where all files are automatically encrypted at rest using a specific encryption key.

intermediate

How does HDFS encryption at rest affect file read and write operations?

When writing, data is encrypted before saving to disk. When reading, data is decrypted on the fly, so users see plain data transparently.

beginner

Name one benefit of using HDFS encryption at rest.

It protects sensitive data from theft or unauthorized access if disks or storage devices are lost or stolen.

What does HDFS encryption at rest protect?

A User passwords

B Data in network transit

C Data in memory

D Data stored on disk

HDFS encryption at rest protects data stored on disk by encrypting it.

Which server manages encryption keys for HDFS encryption at rest?

A NameNode

B DataNode

C Key Management Server (KMS)

D ResourceManager

The Key Management Server (KMS) securely manages encryption keys.

What is an encryption zone in HDFS?

A A directory where files are encrypted at rest

B A user access group

C A network firewall zone

D A backup location

An encryption zone is a directory where all files are encrypted at rest.

When are files encrypted in HDFS encryption at rest?

A Before writing to disk

B After reading from disk

C Only during network transfer

D Never

Files are encrypted before writing to disk to protect data at rest.

Which of these is a key benefit of HDFS encryption at rest?

A Faster data processing

B Protection if disks are stolen

C Improved network speed

D Automatic data backup

Encryption at rest protects data if disks or storage devices are lost or stolen.

Explain how HDFS encryption at rest works and why it is important.

Think about how data is stored and protected on the hard drive.

Describe the role of the Key Management Server (KMS) in HDFS encryption at rest.

Consider who holds the keys to unlock encrypted data.