Watchguard Network Security Practice Test

How can you avoid a network outage for clients on the trusted network when changing the interface IP address?

1. Create a 1-to-1 NAT rule for traffic from the 10.0.40.0/24 subnet to addresses on the 10.0.50.0/24 subnet.

2. Add 10.0.40.1/24 as a secondary IP address for the interface.

3. Add IP addresses on the 10.0.40.0/24 subnet to the DHCP Server IP address pool for this interface.

4. Add a route to 10.0.40.0/24 with the gateway 10.0.50.1.

The correct answer is: Add 10.0.40.1/24 as a secondary IP address for the interface.

Adding a secondary IP address for the interface is a strategic approach to avoid network outages when changing the interface IP address. By configuring the new IP address as a secondary option, the original IP address remains available during the transition. This means that existing clients on the trusted network, which rely on the current IP address for communication, can continue to function without interruption. This method provides a seamless experience, as devices connected to the trusted network can still reach the interface through the old IP address while the new configuration is being implemented. Once the transition is confirmed to be successful and all clients are able to communicate using the new address, the old address can be safely removed. The other options proposed do not effectively address the need to maintain client connectivity during the changeover period. For example, creating a NAT rule, while useful for translating addresses, does not maintain direct communication for clients on the original subnet to the new subnet, potentially causing disruptions. Adjusting the DHCP server or adding a route could also result in connectivity issues, as they involve changes that may not support the ongoing communication needs of clients using the trusted network during the transition.