Which of the following protocols would MOST likely be used in the establishment of an IPSec VPN tunnel?
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A. B. C. D.D.
The protocol that would MOST likely be used in the establishment of an IPSec VPN tunnel is ISAKMP, which stands for Internet Security Association and Key Management Protocol. ISAKMP is a protocol used to establish a secure, authenticated connection between two network devices, such as two routers or a router and a firewall.
IPSec, or Internet Protocol Security, is a suite of protocols used to provide secure communication over the Internet. IPSec can be used to create a VPN tunnel between two networks, allowing data to be transmitted securely over the Internet.
ISAKMP is used to establish the parameters for the VPN tunnel, such as the encryption algorithm, the authentication method, and the key management protocol to be used. Once the parameters are established, IPSec is used to create the encrypted tunnel.
AES (Advanced Encryption Standard) and TKIP (Temporal Key Integrity Protocol) are encryption algorithms that could be used with IPSec to provide encryption for the data transmitted over the VPN tunnel. 802.1q is a standard for VLAN tagging in Ethernet networks and is not related to VPNs or encryption.
In summary, the correct answer to this question is D, ISAKMP, as it is the protocol used to establish the secure connection for an IPSec VPN tunnel.