Why do clients trust a certificate issued by a Certificate Authority?

Because the CA guarantees the certificate never expires

Because the certificate contains the client's password

Because the CA's public key is pre-installed in the client's trust store

Because the certificate is encrypted with the client's private key

What is the primary role of a Certificate Authority (CA) in a PKI?

To encrypt all data on the network

To issue and digitally sign digital certificates

To monitor network traffic for intrusions

What is the main function of a Public Key Infrastructure (PKI)?

To manage digital certificates and public keys

To block unauthorized access to a network

To encrypt all network traffic automatically

A security policy requires that sensitive files be encrypted at rest and that any tampering be detectable. The administrator has already encrypted the files with `openssl enc`. What additional step should the administrator take to meet the tamper-detection requirement?

Generate and store a SHA-256 hash of each encrypted file.

Encrypt the files a second time with a different algorithm.

Use `chmod 000` on the encrypted files.

Store the encryption key in the same directory as the encrypted files.

What is the primary purpose of encrypting files on a Linux system?

To verify that a file has not been modified

To authenticate the sender of a file

To protect the confidentiality of data at rest

To compress files to save disk space

CompTIALinux+

Domain 3Objective 5

Cryptography XK0-006 Practice Questions (Page 5)

Part of the Security domain, which accounts for 18% of the XK0-006 exam. CompTIA does not publish an official question count, but from its 90-minute exam (~35–60 total, ~6–11 in this domain), expect 1–2 from this objective — we provide 35 practice questions to prepare you well beyond it. (estimate)

35questions here

7free pages

9concepts

18%of the exam

Questions 21–25

21foundation · easy
Why do clients trust a certificate issued by a Certificate Authority?
Select an answer first
22foundation · easy
What is the primary role of a Certificate Authority (CA) in a PKI?
Select an answer first
23foundation · easy
What is the main function of a Public Key Infrastructure (PKI)?
Select an answer first
24expert · hard
A security policy requires that sensitive files be encrypted at rest and that any tampering be detectable. The administrator has already encrypted the files with `openssl enc`. What additional step should the administrator take to meet the tamper-detection requirement?
Select an answer first
25foundation · easy
What is the primary purpose of encrypting files on a Linux system?
Select an answer first

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