WAN Service Providers

Correct Answer: MPLS

MPLS (Multiprotocol Label Switching) is the best choice for a retail business facing high fluctuations in network demand during peak seasons. It offers scalable, protocol-independent transport and allows for dynamic traffic engineering to manage bursts in demand. This is critical for retail businesses, which may face sudden increase in network load during peak shopping seasons. Moreover, MPLS typically operates on a usage-based pricing model, meaning you only pay for the bandwidth you use, making it ideal for organizations with variable bandwidth requirements. The other options, leased line, T1, and ISDN, while they can provide stable and reliable connections, they are generally not usage-based and lack the flexibility to dynamically handle fluctuations in demand.

Correct Answer: Satellite

The best WAN technology for a company to establish a connection between their mainland office and a remote island office is Satellite. This is because the other options provided do not typically work over long distances or across bodies of water. DSL and T1 are land-based communication systems and usually require physical cables, which might not be practical or even possible to implement over the ocean for geographic and cost reasons. MPLS (Multi-Protocol Label Switching) is a routing technique that directs data from one node to the next based on short path labels rather than long network addresses, it is also restricted by geographical constraints like a body of water. On the other hand, Satellite technology can broadcast signals over long distances covering large geographic areas, making it ideally suited for a remote island connection scenario.

Correct Answer: DSL

The best option for a small business with a limited budget looking for a WAN service to support video conferencing with a moderate data rate is DSL. DSL is a high-speed, low-cost option that provides a dedicated line and decent speeds which should be sufficient for moderate video conferencing. On the other hand, T1 is more expensive and may not be feasible due to budget constraints. Though MPLS provides better quality service, it is expensive and probably more than what's needed for a small business with moderate data rate needs. Leased Line, while providing good service, can also be expensive and is usually used for larger businesses with higher data demands.