Given the command ssh -i mykey.pem ubuntu@198.51.100.10, what will happen if the private key file mykey.pem has permissions set to 777?

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AWS - EC2 Fundamentals

Given the command ssh -i mykey.pem ubuntu@198.51.100.10, what will happen if the private key file mykey.pem has permissions set to 777?

AConnection will fail due to insecure key file permissions

BConnection will succeed without warnings

CSSH will prompt for a password instead

DThe instance will reject the username 'ubuntu' automatically

Step-by-Step Solution

Solution:

Step 1: Understand SSH key file permission requirements
SSH requires private key files to have strict permissions (usually 400 or 600) to prevent unauthorized access.
Step 2: Effect of 777 permissions on SSH connection
Permissions 777 are too open, so SSH refuses to use the key and fails the connection.
Final Answer:
Connection will fail due to insecure key file permissions -> Option A
Quick Check:
Too open key permissions = connection failure [OK]

Quick Trick: Private key must have strict permissions (chmod 400) [OK]

Common Mistakes:

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