Network Documentation

Correct Answer: Trace the cable and update the documentation with the correct switch

A competent technician would make sure to trace the cable and update the network layout documentation with the correct switch connection. The correct documentation is crucial for future troubleshooting, improvements, or changes in the network infrastructure. Ignoring the Access Point (AP) because it's not relevant to the current change request doesn't take into consideration any future requests that may affect this AP. The AP may not be relevant to the current scenario, but it is still part of the entire network, thus its exclusion from the documentation would be incorrect. Assuming that the AP is connected to another switch without confirming it could lead to future complications, making this also an incorrect way of handling this situation.

Correct Answer: Review the documentation, and update it to reflect the new infrastructure

When changes are made to the network infrastructure, the first step should be to update the documentation to reflect these changes (Review the documentation, and update it to reflect the new infrastructure). This is crucial in order to maintain an accurate representation of the current network layout and configuration, which will aid in problem detection and network management. The other options involve passive or incomplete attempts to maintain documentation - Waiting for discrepancies to be reported by users is a reactive approach that can lead to unnoticed issues, updating the documentation only for critical devices overlooks the importance of understanding the entire network, and using a copy of the old documentation without any changes fails to account for the new upgrades entirely.

Correct Answer: VPN type, encryption, authentication, IP addresses

The best answer to this question is 'VPN type, encryption, authentication, IP addresses.' This information is crucial when preparing network documentation for a site-to-site VPN (Virtual Private Network). Let's overview each element. The VPN type (Layer 2 Tunneling Protocol, IPsec, etc.) is essential as it defines the protocol being used to secure the connection. Encryption information includes the type of encryption being used (like AES, DES, 3DES, etc.) to secure the data transmitted over the network. Authentication details denote the process of validating the identities of communicating entities on the network. IP addresses used for the VPN connection should also be recorded as they are critical for network troubleshooting and configuration. The other options are partially incorrect. 'VPN type, hardware serial numbers, user names, and passwords' contains irrelevant info like hardware serial numbers and user names/passwords, which shouldn't be part of a network documentation due to security reasons. 'VPN type, subnet mask only', is incomplete as it lacks encryption/authentication details and IP addresses. 'VPN type, vendor contact information, cost' is also incorrect because vendor contact information and cost are irrelevant to the technical details of a VPN connection.