Final answer:
The true statement about PAgP for creating EtherChannels is that it is a Cisco proprietary protocol. PAgP helps in the formation of EtherChannels by automatically combining several Ethernet links into one logical link on Cisco devices.
Step-by-step explanation:
The correct answer to the question 'Which statement is true regarding the use of PAgP to create EtherChannels?' is B) It is Cisco proprietary. Port Aggregation Protocol (PAgP) is indeed a Cisco proprietary protocol and it is used to automatically aggregate multiple Ethernet ports to form a logical link, or EtherChannel. Unlike LACP (Link Aggregation Control Protocol), which is an IEEE standard (802.3ad), PAgP can only be used on Cisco devices. While it does require the ports to operate in a compatible speed and duplex mode, it does not specifically mandate full duplex or a particular number of physical links unlike LACP. Also, EtherChannels simplify the network by reducing the number of ports participating in spanning tree as the switch treats the EtherChannel as a single logical connection.
The correct statement regarding the use of PAgP to create EtherChannels is B) It is Cisco proprietary.PAgP, or Port Aggregation Protocol, is a proprietary Cisco protocol used to create EtherChannels or link aggregation. It allows multiple physical links to be combined into a single logical link to increase bandwidth and provide redundancy. PAgP is specific to Cisco devices and is not compatible with other vendor equipment.Other options A) It requires full duplex, C) It requires more physical links than LACP does, D) It increases the number of ports that are participating in spanning tree, and E) It mandates that an even number of ports be used for aggregation are not true regarding the use of PAgP.