How can the company securely authenticate to Linux-based Amazon EC2 instances?
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Correct answer: Use SSH keys..
Why this is the answer
SSH (Secure Shell) keys provide a secure and standard method for authenticating to Linux-based Amazon EC2 instances. When you launch an EC2 instance, you specify a key pair. The public key is stored on the instance, and you use the private key on your local machine to establish a secure SSH connection. This cryptographic method ensures that only authorized users with the corresponding private key can access the instance. A VPN (Virtual Private Network) creates a secure network connection over a public network but doesn't directly authenticate users to individual EC2 instances. End-to-end encryption secures data in transit but is a broader concept and not the specific authentication mechanism for SSH. Amazon Route 53 is a DNS web service and is unrelated to instance authentication.
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