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Which of the following represents the BEST cryptographi…

A large corporation has data centers geographically distributed across multiple continents. The company needs
to securely transfer large amounts of data between the data center. The data transfer can be accomplished
physically or electronically, but must prevent eavesdropping while the data is on transit. Which of the following
represents the BEST cryptographic solution?

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Driving a van full of Micro SD cards from data center to data center to transfer data

Exchanging VPN keys between each data center via an SSL connection and transferring the data in the

Using a courier to deliver symmetric VPN keys to each data center and transferring data in the VPN

Using PKI to encrypt each file and transferring them via an Internet based FTP or cloud server

A virtual private network (VPN) is an encrypted communication tunnel that connects two systems over an
untrusted network, such as the Internet. They provide security for both authentication and data transmission
through a process called encapsulation.
Secure Sockets Layer (SSL) can be used to exchange the VPN keys securely. SSL is used to establish secure
TCP communication between two machines by encrypting the communication.

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