Implementing Cisco IP Switched Networks (SWITCH v2-0) (#55)

Which two statements about EtherChannels are true? (Choose two.)

A port in desirable mode can form an EtherChannel with a port in auto mode.
Ports in on mode accept PAgP requests.
Ports in on mode accept LACP requests.
PAgP is a Cisco-proprietary technology.
A port in auto mode can form an EtherChannel with another port in auto mode.