IPsec vs VPN

a1) Select the term that refers to the data recipient's ability to ensure that the data was not altered in any fashion as the data was sent across the VPN: A) Encryption. B) Integrity. C) Authentication. D) Tunneling.

b2) Tunneling is a technique in which the IP datagram is first _______ and then _______. A) Encapsulated in another datagram; encrypted. B) Encrypted; encapsulated in another datagram. C) Authenticated; encrypted. D) Encrypted; authenticated.

c3) What is the relationship between a VPN and an extranet? Explain. A) Some extranets are VPNs; some VPNs are extranets. B) Some extranets are VPNs; all VPNs are extranets. C) VPNs and extranets are the same type of network. D) VPNs are unrelated to extranets.

d4) Which one is the best approach to VPNs? Explain. A) VPN-specific gateway device. B) Router-based. C) Firewall-based. D) Software only. E) All of the above.