What is the function of the crypto isakmp key cisc406143794 address 0.0.0.0 0.0.0.0 command when establishing an IPsec VPN tunnel?

The correct answer is B. It configures the pre-shared authentication key. This command is used to configure pre-shared-key for IPsec remote acess users on the Cisco router. Address is mentioned as 0.0.0.0 0.0.0.0 because the users will be connecting from random ip addresses and it is almost impossible to mention all the ip addresses. Hence, 0.0.0.0…

Submitted by miguelv· Mar 30, 2026

Question

Options

AIt prevents all IP addresses from connecting to the VPN server.
BIt configures the pre-shared authentication key.
CIt configures the local address for the VPN server.
DIt defines what data is going to be encrypted via the VPN.

How the community answered

(26 responses)

A
4% (1)
B
92% (24)
C
4% (1)

Explanation

This command is used to configure pre-shared-key for IPsec remote acess users on the Cisco router. Address is mentioned as 0.0.0.0 0.0.0.0 because the users will be connecting from random ip addresses and it is almost impossible to mention all the ip addresses. Hence, 0.0.0.0 0.0.0.0 is used to allow all public ip addresses.

Topics

#IPsec VPN#IKE pre-shared key#Cisco CLI

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