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NEW QUESTION # 109
Which of the following describes how a user's public key is used during SSH authentication?
Answer: A
Explanation:
During SSH public key authentication, the server checks if the user's public key is present in the
~/.ssh/authorized_keys file. If the key is found, the server uses it to verify the user's identity by sending a challenge that can only be answered by the corresponding private key. This process does not involve password hashing or using the public key directly for encryption of the communication stream. Instead, the public key is simply used as a reference for authentication.
NEW QUESTION # 110
A Linux administrator needs to securely erase the contents of a hard disk. Which of the following commands is the best for this task?
Answer: B
Explanation:
The shred command securely erases data by overwriting the specified device or file multiple times, making recovery nearly impossible. This is the best option for securely erasing a hard disk.
NEW QUESTION # 111
A Linux engineer needs to record new changes completed on a Git repository. Which of the following commands should the engineer use?
Answer: A
Explanation:
This command records the staged changes in the local repository by creating a new commit, preserving a snapshot of the work and its history.
NEW QUESTION # 112
To perform a live migration, which of the following must match on both host servers? (Choose two)
Answer: A,D
Explanation:
Comprehensive and Detailed 250 to 350 words of Explanation From Linux+ V8 documents:
Live migration is a virtualization feature that allows a running virtual machine to be moved from one host to another with minimal or no downtime. This topic falls under System Management in the CompTIA Linux+ V8 objectives, particularly in the areas of virtualization and resource management.
For a live migration to succeed, the CPU architecture must match between the source and destination hosts.
This is critical because the running virtual machine's CPU state, instruction set, and registers must be compatible with the destination system. Migrating between different CPU architectures (for example, x86_64 to ARM) is not supported and would cause the virtual machine to fail. Therefore, option D is required.
Additionally, the destination host must have sufficient available memory to accommodate the virtual machine being migrated. During live migration, the memory contents of the running VM are copied from the source host to the destination host while the VM continues to run. If enough memory is not available, the migration cannot complete successfully. This makes option E mandatory.
The other options are not strict requirements. USB ports do not need to match for live migration. Network speed may affect migration performance but does not need to be identical. Available swap space is not directly required for migration. Disk storage paths do not need to match as long as shared storage or compatible storage access is available.
Linux+ V8 documentation emphasizes CPU compatibility and memory availability as core prerequisites for live migration. Therefore, the correct answers are D and E.
NEW QUESTION # 113
An administrator has generated an RSA SSH key pair to log in to a remote server. After copying the public key and attempting to log in, the administrator sees the following message:
admin@192.168.10.50: Permission denied (publickey,password)
After seeing the message, the administrator attempts to connect using ssh -v admin@192.168.10.50 and notices the following debug output:
debug1: send_pubkey_test: no mutual signature algorithm
Which of the following actions should the administrator take first to remediate this issue?
Answer: C
Explanation:
The "no mutual signature algorithm" error means the RSA/SHA-1 key type (ssh-rsa) isn't supported by both client and server. Generating a new key with a modern algorithm (e.g., ssh- keygen -t ecdsa) ensures a mutually supported signature method.
NEW QUESTION # 114
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