Which of the following is a cryptographic network protocol for operatingnetwork services securely over an unsecured network.Answer areaSCPSSLSSHVoIP

The cryptographic network protocol for operating network services securely over an unsecured network among the options given is SSH (Secure Shell).

Here's a step-by-step explanation:

1. SCP (Secure Copy Protocol) is a means of securely transferring computer files between a local and a remote host or between two remote hosts. It's based on the Secure Shell (SSH) protocol, but it's not a protocol for operating network services.

2. SSL (Secure Sockets Layer) is a standard security technology for establishing an encrypted link between a server and a client. It's typically used to secure credit card transactions, data transfer and logins, and more recently is becoming the norm when securing browsing of social media sites.

3. SSH (Secure Shell) is a cryptographic network protocol for operating network services securely over an unsecured network. Typical applications include remote command-line, login, and remote command execution, but any network service can be secured with SSH.

4. VoIP (Voice over Internet Protocol) is a technology that allows you to make voice calls using a broadband Internet connection instead of a regular (or analog) phone line. It's not a protocol for operating network services securely over an unsecured network.

So, the correct answer is SSH.