Network Cabling and Infrastructure

Correct Answer: LC connector

The correct choice for connecting two buildings with single-mode fiber cabling for high-speed data transfer is the LC connector. LC connectors are small form-factor connectors that are designed for high-density applications and provide a secure and quick connection for fiber cables. They have a small, square interface that is excellent for single-mode fiber connections where precision is critical. An RJ45 connector, on the other hand, is used for Ethernet networks that use twisted pair cables, not fiber ones. The BNC connector is a type of connector used with coaxial cables, again, not fiber ones. Lastly, F connectors are typically used with television cables and are not appropriate for a high-speed fiber optic network.

Correct Answer: Install a switch or repeater every 100 meters

The best solution to increase the data transfer speeds in this case is to 'Install a switch or repeater every 100 meters'. Cat5e cables have a maximum length of 100 meters for a segment. If you go beyond that, the signal starts to degrade, which can lead to slower data transfer speeds. By installing a switch or repeater every 100 meters, you ensure that the signal is refreshed and can travel for another 100 meters without degradation. The other solutions are not the best: 'Change the cable to Cat6' might improve the situation but would be more expensive than simply installing a switch or repeater. 'Replace the network card on the computers' is not related to the issue presented, as the problem is related to the length of the cable, not the network cards. 'Use WiFi instead' might not provide a stable or fast enough connection for the needs of the company.

Correct Answer: Industrial Ethernet switch

The best option in this case would be the Industrial Ethernet switch. Industrial ethernet switches are designed to operate reliably under harsh conditions such as high ambient temperatures and poor ventilation, which are the environmental conditions mentioned in the question. The other options do not necessarily have these robust features. A Managed switch allows for greater control over the network traffic but does not inherently provide better physical durability. Stackable switches can be grouped into a single unit which can be managed as a single object, but this does not indicate any enhanced resistance to harsh environmental conditions. Layer 3 switch, whereas, is a switch which can operate at the network layer of the OSI model and can both route and switch packets, but it also does not mean it can withstand poor ventilation and high temperatures.