Refer to the exhibit.
What does the command channel-group 1 mode desirable do?
A.
enables LACP unconditionally
B.
enables PAgP only if a PAgP device is detected
C.
enables PAgP unconditionally
D.
enables EtherChannel only
E.
enables LACP only if an LACP device is detected
Explanation:
The command channel-group 1 mode desirable enables PAgP unconditionally on the interface
FastEthernet 0/13:
Switch (config-if)#channel-group 1 mode ?
Active Enable LACP unconditionally
Auto Enable PAgP only if a PAgP device is detected
Desirable Enable PAgP unconditionally
On Enable Etherchannel only
Passive Enable LACP only if a LACP device is detected
Reference:
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/catos/5.x/configuration/guide/channel.html