Which of the following protocols encapsulates an IP packet with an additional IP header?
A.
SFTP
B.
IPSec
C.
HTTPS
D.
SSL
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In here all we need to know ios that the answers is IPSEC.
It is the only Protocol listed that meets the requirement.
In IPSEC, In tunnel mode, the entire original IP packet—payload and header—is encapsulated within another IP payload, and a new header is appended to it.
In addition to that, Authentication Header (AH) is a member of the IPsec protocol suite. AH operates directly on top of IP, using IP protocol number 51.
https://www.juniper.net/documentation/en_US/junos/topics/concept/vpn-security-ike-ipsec-packet-process-understanding.html
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IPSec VPN service enhances the security of your VPN connection. It does so by ensuring a unique session key for each negotiation. For further detail https://www.purevpn.com/what-is-vpn/protocols/ipsec
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