Refer to the exhibit.

Which set of configurations will result in all ports on both switches successfully bundling into an EtherChannel?

A.
switch1
channel-group 1 mode active
switch2
channel-group 1 mode auto

B.
switch1
channel-group 1 mode desirable
switch2
channel-group 1 mode passive

C.
switch1
channel-group 1 mode on
switch2
channel-group 1 mode auto

D.
switch1
channel-group 1 mode desirable
switch2
channel-group 1 mode auto

Explanation:
The different etherchannel modes are described in the table below:
Mode
Description
active
Places an interface into an active negotiating state, in which the interface starts negotiations with other interfaces by sending LACP packets.
auto
Places an interface into a passive negotiating state, in which the interface responds to PAgP packets it receives but does not start PAgP packet negotiation. This
setting minimizes the transmission of PAgP packets.
desirable
Places an interface into an active negotiating state, in which the interface starts negotiations with other interfaces by sending PAgP packets.
on

Forces the interface into an EtherChannel without PAgP or LACP. With the on mode, a usable EtherChannel exists only when an interface group in the on mode is
connected to another interface group in the on mode.
passive
Places an interface into a passive negotiating state, in which the interface responds to LACP packets that it receives, but does not start LACP packet negotiation.
This setting minimizes the transmission of LACP packets.
Both the auto and desirable PAgP modes allow interfaces to negotiate with partner interfaces to determine if they can form an EtherChannel based on criteria such
as interface speed and, for Layer 2 EtherChannels, trunking state and VLAN numbers. Interfaces can form an EtherChannel when they are in different PAgP modes
as long as the modes are compatible. For example:
·An interface in the desirable mode can form an EtherChannel with another interface that is in the desirable or auto mode.
·An interface in the auto mode can form an EtherChannel with another interface in the desirable mode.
An interface in the auto mode cannot form an EtherChannel with another interface that is also in the auto mode because neither interface starts PAgP negotiation.
An interface in the on mode that is added to a port channel is forced to have the same characteristics as the already existing on mode interfaces in the channel.
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3550/software/release/12- 1_13_ea1/configuration/guide/3550scg/swethchl.html