Which WAN technology is a cost-effective method to deliver 100Mb of bandwidth to multiple branch offices?

Which WAN technology is a cost-effective method to deliver 100Mb of bandwidth to multiple
branch offices?

A.
DSL

B.
DWDM

C.
ISDN

D.
Metro Ethernet

Explanation:

Metro Ethernet
Metro Ethernet uses well-known “Ethernet” to deliver low-cost and high-speed MAN/WAN

connectivity for organizations. Many service providers now offer Metro Ethernet solutions to deliver
a wide range of converged network services such as data, voice, and video on the same wire.
Metro Ethernet provides enterprise LAN type functionality out in the MAN and WAN. increasing the
throughput available for applications. Metro Ethernet bandwidths can range from 10Mbps to 1
Gbps. and even higher in some cases, allowing for support for higher performance and increased
QoS requirements. In contrast to the rigid nature of traditional TDM provisioning, Metro Ethernet
services are much easier to deploy and scale due to the flexible bandwidth increments. Metro
Ethernet technology is appealing to many customers because they are already comfortable using
Ethernet throughout their LAN environments.