WAN Technologies

Correct Answer: MPLS VPN

MPLS VPN is the best choice for connecting two remote offices securely. It stands for Multi-Protocol Label Switching Virtual Private Network. This technology is known for providing highly secure and efficient network connections. Compared to other options, it is best suited to deal with long distances and data privacy concerns. Dial-up is not suitable as it's a slow technology and isn't ideal for modern business requirements. DSL, standing for Digital Subscriber Line, is a technology used for internet access and isn't typically used for secure wide area network connections. ISDN-BRI (Integrated Services Digital Network Basic Rate Interface) is an older technology that has limited bandwidth and is less efficient, making it an impractical solution for connecting two remote offices together.

Correct Answer: Terrestrial microwave

The best answer is 'Terrestrial microwave'. Satellite links are known for high latency due to the significant distance signals must travel from the earth to the satellite and back. Using terrestrial microwave links can help address this issue. Terrestrial microwave links use earth-based stations to send and receive signals, resulting in lower latency due to the reduced distance these signals need to travel. The other options like 'Dial-up', 'DSL', and 'Cable' aren't ideal solutions. 'Dial-up' is a very slow method of internet access and wouldn't reduce latency. Similar is the case with 'DSL' and 'Cable', they would not significantly reduce latency compared to satellite links as they are prone to congestion and aren't as fast as terrestrial microwave links.

Correct Answer: ISDN

ISDN (Integrated Services Digital Network) is the most suitable option as it provides both voice and data communications in a single line, offering a more cost-effective solution for the organization. Frame Relay is primarily designed for data communications and not recommended for voice, making it not suitable. Dedicated Leased Line can be expensive and may not be the cost-effective solution the network engineer is looking for. Finally, Cable is mainly used for residential and not typically used for business WAN services.