Cisco Certified Network Associate (CCNA) Practice Exam

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What is a required step when adding a switch back into a production network after maintenance?

Reset the switch configuration
Verify VTP information
Change the switch's MAC address
Disconnect all connected devices

The correct answer is: Verify VTP information

When adding a switch back into a production network after maintenance, verifying VTP (VLAN Trunking Protocol) information is crucial. VTP is a network protocol used to manage VLANs across a network of switches. If a switch has been out of the network for a while, it might have outdated VTP information, which can lead to inconsistencies in VLAN configurations once it is reintroduced. By validating the VTP settings, such as the VTP domain name and revision number, you ensure that the switch will synchronize with the rest of the network correctly and maintain the same VLAN configurations. This step helps prevent potential network disruptions that could arise from mismatches in VLAN setups, which could lead to traffic being misrouted or become unreachable. Ensuring the integrity of VTP information is particularly important in larger networks where VLAN management can be complex, as incorrect configurations may impact multiple devices and users.