CompTIA CASP+ Practice Test

Which protocol should be used by the cable company to enable customers to establish VLANs to different sites?

1. MPLS

2. VPLS

3. Ethernet

4. SD-WAN

The correct answer is: MPLS

The most suitable protocol for enabling customers to establish VLANs to different sites is MPLS (Multiprotocol Label Switching). MPLS is designed to route data from one node to another based on short path labels rather than long network addresses, which allows it to manage traffic flows efficiently and create multiple virtual networks (or VLANs) across a shared infrastructure. Using MPLS allows service providers, like a cable company, to offer their customers the ability to create secure, isolated virtual private networks that span multiple locations. Each VLAN can have unique characteristics, such as differentiated quality of service (QoS) and traffic management. This is particularly useful for businesses with multiple branches needing to maintain separate VLANs that can seamlessly communicate while optimizing bandwidth and enhancing security. In contrast, while VPLS (Virtual Private LAN Service) can also create a virtualized Ethernet environment over MPLS, it primarily focuses on providing Ethernet services across a WAN, which may not offer the same flexibility for all types of traffic routing as MPLS does. Ethernet alone is a networking technology used within local network environments and does not inherently provide the wide area capabilities necessary for connecting to different sites effectively. SD-WAN is a form of WAN architecture that leverages various transport services like MPLS, LTE