A company needs to interconnect several branch offices across a metropolitan area. The network engineer is seeking a solution that provides high-speed converged traffic, including voice, video, and data on the same network infrastructure. The company also wants easy integration to their existing LAN infrastructure in their office locations. Which technology should be recommended?

The technology that should be recommended for interconnecting several branch offices across a metropolitan area with high-speed converged traffic and easy integration into existing LAN infrastructure is Ethernet WAN.

Ethernet WAN, often referred to as Metro Ethernet in the context of a metropolitan area, is a network service that extends Ethernet beyond the local area network (LAN) across a metropolitan area network (MAN) or wide area network (WAN). It allows for the seamless connection of geographically separated offices as if they are on the same local network, providing high bandwidth and supporting a variety of data types, including voice, video, and data. Ethernet WAN is known for its simplicity, scalability, and ease of integration with existing Ethernet LANs.

ISDN, VSAT, and Frame Relay are older technologies that are typically not used for high-speed converged networks and do not offer the same level of integration with Ethernet LANs as Ethernet WAN does. ISDN and Frame Relay are also becoming obsolete and are being replaced by more modern technologies like Ethernet WAN and MPLS. VSAT, which stands for Very Small Aperture Terminal, is a satellite-based communication technology and would not be the optimal choice for high-speed data and easy LAN integration.