Which of the following is Cisco proprietary?Question 1Select one:LLDPLACPPAgPNTP

To determine which of the provided options is Cisco proprietary, we need to understand what each acronym refers to.

1. LLDP (Link Layer Discovery Protocol): This is an open standard protocol used for network devices to advertise their identity and capabilities to neighboring devices.

2. LACP (Link Aggregation Control Protocol): This is also an open standard defined by IEEE 802.1AX (formerly 802.3ad) for bundling several physical links to form a single logical link.

3. PAgP (Port Aggregation Protocol): This is a Cisco proprietary protocol that serves a similar purpose to LACP but is specific to Cisco devices.

4. PNTP (Precision Network Time Protocol): This is not widely recognized and does not refer to a standard industry protocol.

Conclusion

Among the options provided, PAgP (Port Aggregation Protocol) is the Cisco proprietary protocol.