An engineer must extend Layer 2 Between two campus sites connected through an MPLS backbone that encapsulates Layer 2 and Layer 3 data. Which action must the engineer perform on the routers to accompl

EtherChannel aggregates multiple physical links for increased bandwidth and redundancy within a local network segment, not for extending Layer 2 across a wide-area MPLS backbone.

A pseudowire is the correct mechanism to extend Layer 2 between two sites over an MPLS backbone. It emulates a point-to-point Ethernet connection (E-LINE service) by encapsulating Layer 2 frames into MPLS packets for transport across the core network.

Cisco MPLS Traffic Engineering (TE) is used for optimizing traffic paths and reserving bandwidth within an MPLS network, but it does not directly extend Layer 2 connectivity itself.

Configuring QoS for MPLS and E-ACCESS is focused on managing traffic quality and network access, not on establishing the fundamental Layer 2 connectivity between disparate sites.