Which two channel-group modes configure an EtherChannel to actively negotiate? (Choose two.)
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Correct answer: channel-group 10 mode desirable, channel-group 10 mode active.
Why this is the answer
The "desirable" and "active" modes configure EtherChannel to actively negotiate. "Desirable" is for Port Aggregation Protocol (PAgP), where the interface actively attempts to form an EtherChannel. "Active" is for Link Aggregation Control Protocol (LACP), where the interface actively attempts to form an EtherChannel. Both modes initiate negotiation. "On" mode forces the interface into an EtherChannel without negotiation, so it's not active. "Auto" (PAgP) and "passive" (LACP) modes configure the interface to listen for negotiation attempts but not initiate them, making them passive rather than active.
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