An "encrypted" tunnel - everything going through is encrypted - but should still always use https in addition
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An encryption device that is often built into a firewall that encrypts everything coming in or going out; there are also software versions, can be part of the OS, but it's usually hardware
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This is built into the browser - when using https
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Everything coming into the corporate network as well as to third party sites goes though the tunnel
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Only stuff over the internet coming into the corporate network goes through the tunnel, not stuff going to external third party sites
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Think of a corporate network with 2 separate physical sites - each site having a VPN concentrator
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Encryption protocol over OSI layer 3 that is very standard and authenticates and encrypts every packet - provides confidentiality and anti-reply attacks
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Part of IPSec that does the authentication
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Part of IPSec that does the encryption - uses hashses, AES or 3DES for encryption, and adds header, trailer, and check value
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IPSec mode that only encrypts the data part of the packet
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IPSec mode that encrypts both the data and the header parts of the packet
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