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1- What is the packet format for a VPN connection and which cryptographic

techniques are used for?

1.   Do we use MAC or digital signature in VPN?

2.   Do we use symmetric cryptography in VPN?

3.   Do we use any Hash function in VPN?

4.   How do we manage keys in VPN?

5.   How can we provide confidentiality and integrity in VPN?

Step by step explanations please

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