Which protocols can be used to dynamically configure an EtherChannel?

The ability to dynamically configure an EtherChannel is facilitated by specific protocols designed for link aggregation. The dynamic protocols used for this purpose are Port Aggregation Protocol (PAgP) and Link Aggregation Control Protocol (LACP).

PAgP is a Cisco proprietary protocol used to automatically form EtherChannels by allowing switches to communicate and negotiate port bundling. It ensures that the links sharing an EtherChannel configuration are compatible and provides a way to aggregate them when the connection parameters match.

On the other hand, LACP is an IEEE standard (802.3ad) that also serves to bundle multiple physical links into a single logical link. It allows network devices from different vendors to work together in creating EtherChannels, ensuring interoperability between equipment from different manufacturers.

The other protocol options listed do not serve the purpose of configuring EtherChannels. HDLC (High-Level Data Link Control) and PPP (Point-to-Point Protocol) are used for point-to-point link layer connectivity, making them unrelated to dynamic EtherChannel formation. RIP (Routing Information Protocol) and OSPF (Open Shortest Path First) are routing protocols focused on determining the best path for data packets within a network, not on link aggregation or EtherChannel setup. Similarly, spanning tree protocols