Quick Answer
The correct answer is ssh-keygen and ssh-copy-id, as these two commands form the complete workflow for managing SSH key-based authentication. The ssh-keygen command generates a cryptographic key pair—a private key kept on the client and a public key that can be safely shared—while ssh-copy-id automates the secure installation of that public key into the remote server’s ~/.ssh/authorized_keys file, enabling passwordless login. On the CompTIA Linux+ XK0-005 exam, this pairing tests your understanding of the authentication lifecycle, from key creation to deployment; a common trap is confusing ssh-add (which loads keys into an agent) with ssh-copy-id, or forgetting that ssh-keygen must be run first. To remember the order, think “generate first, copy second”—the key pair must exist before you can install it remotely.
This XK0-005 practice question tests your understanding of security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO commands are used to manage SSH key-based authentication processes? (Choose exactly two.)
ssh-keygen
Generates public/private key pairs for SSH.
ssh-add
Why wrong: Adds private keys to ssh-agent, not for initial setup.
ssh-copy-id
Copies the public key to remote server's authorized_keys.
ssh-keyscan
Why wrong: Gathers public host keys from remote servers, does not manage user keys.
ssh-agent
Why wrong: Manages private keys in memory but is not used for initial key management.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ssh-keygen
The `ssh-keygen` command generates the public and private key pair used for SSH key-based authentication, while `ssh-copy-id` installs the public key on a remote server's `~/.ssh/authorized_keys` file, enabling passwordless login. Together, they form the core workflow for setting up SSH key authentication.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
ssh-keygen
Why this is correct
Generates public/private key pairs for SSH.
Related concept
Read the scenario before looking for a memorised answer.
ssh-add
Why it's wrong here
Adds private keys to ssh-agent, not for initial setup.
ssh-copy-id
Why this is correct
Copies the public key to remote server's authorized_keys.
Related concept
Read the scenario before looking for a memorised answer.
ssh-keyscan
Why it's wrong here
Gathers public host keys from remote servers, does not manage user keys.
ssh-agent
Why it's wrong here
Manages private keys in memory but is not used for initial key management.
Common exam traps
CompTIA often tests the distinction between key generation/distribution commands (`ssh-keygen`, `ssh-copy-id`) and agent management commands (`ssh-agent`, `ssh-add`), leading candidates to mistakenly select agent-related options for managing authentication processes.
Detailed technical explanation
SSH key-based authentication relies on asymmetric cryptography (RSA, ECDSA, or Ed25519). The private key remains on the client and should be protected with a passphrase, while the public key is appended to `~/.ssh/authorized_keys` on the server. The `ssh-copy-id` command automates this by using `ssh` to log in with a password and then appending the key, ensuring correct file permissions (600 for private key, 644 for public key, 700 for `.ssh` directory).
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the XK0-005 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Security — This question tests Security — Read the scenario before looking for a memorised answer..
The correct answer is: ssh-keygen — The `ssh-keygen` command generates the public and private key pair used for SSH key-based authentication, while `ssh-copy-id` installs the public key on a remote server's `~/.ssh/authorized_keys` file, enabling passwordless login. Together, they form the core workflow for setting up SSH key authentication.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This XK0-005 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the XK0-005 exam.
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