RHCSA RHCSA Software Package Management 4

Question 1

Which command rolls back the most recent DNF transaction?

Accepted Answer

dnf history undo last

Answer

'dnf history undo last' reverses the most recent transaction; you can also specify a transaction ID instead of 'last'.

Question 2

How do you install a specific version of a package, e.g., httpd version 2.4.37?

Accepted Answer

dnf install httpd-2.4.37

Answer

DNF uses the package-version syntax 'packagename-version' (including release and arch optionally) to pin a specific version for installation.

Question 3

A package was installed via RPM but is not showing up in 'dnf list installed'. What is the most likely reason?

Accepted Answer

rpm and dnf share the same RPM database, so this should not happen — the package would appear

Answer

Both rpm and dnf use the same RPM database (/var/lib/rpm), so any rpm-installed package is visible to 'dnf list installed'.

Question 4

What does the 'dnf autoremove' command do?

Accepted Answer

Removes packages that were installed as dependencies but are no longer needed

Answer

'dnf autoremove' cleans up leaf dependency packages that were auto-installed but are no longer required by any explicitly installed package.

Question 5

How can you enable a disabled repository for a single DNF command without editing its .repo file?

Accepted Answer

dnf --enablerepo= install

Answer

The --enablerepo flag temporarily enables a disabled repository for just that invocation without modifying the configuration file.

RHCSA Exam Practice Test