The OpenSSH client (ssh) processes configuration settings in a specific hierarchical order to determine the final value for any given parameter. The command-line options are evaluated last, granting them the highest precedence. This allows a user to override any pre-configured settings from the system-wide (/etc/ssh/sshconfig) or user-specific (~/.ssh/config) files for a single, specific connection attempt. For any given keyword, the first value obtained will be used.

A. /etc/ssh/sshconfig is the system-wide configuration file and has the lowest precedence; its settings are overridden by both user-specific files and command-line options.

B. ~/.ssh/config is the user-specific configuration file. It overrides the system-wide file but is, in turn, overridden by options specified on the command line.

D. /etc/ssh/sshdconfig is the configuration file for the SSH server daemon (sshd), not the ssh client program, and is therefore irrelevant to this question.

1. OpenBSD Manual Pages (Official source for OpenSSH): The sshconfig(5) man page explicitly states the order of precedence.

Source: sshconfig(5) Manual Page

OpenBSD.

Reference: In the "DESCRIPTION" section

it states: "ssh(1) obtains configuration data from the following sources in the following order: 1. command-line options

2. user's configuration file (~/.ssh/config)

3. system-wide configuration file (/etc/ssh/sshconfig)."

2. Oracle Linux 8 Documentation: The official documentation for Oracle Linux

which is the basis for the 1Z0-106 exam

confirms this hierarchy.

Source: Oracle® Linux 8: Securing Oracle Linux

Chapter 10. Securing Remote Connections with OpenSSH.

Reference: Section 10.2.2

"OpenSSH Client Configuration Files

" details that command-line options override settings in configuration files

and user-specific files override system-wide files.

3. MIT OpenCourseWare: Course materials often cover fundamental tools like SSH

reinforcing standard behavior.

Source: MIT 6.NULL

"The Missing Semester of Your CS Education

" Lecture 2: Shell Tools and Scripting.

Reference: The lecture notes on SSH describe the use of ~/.ssh/config to set user-level defaults

which implicitly exist within the standard precedence hierarchy confirmed by official documentation.