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21 May, 01:55

Which two conditions must be met to establish a Layer 2 EtherChannel? (Choose two.)

A. SPAN must be disabled on the ports.

B. LAN ports in the EtherChannel must be contiguous.

C. The trunking protocol must be the same for all links in the EtherChannel.

D. All ports in the EtherChannel must be on the same module.

E. All ports in the EtherChannel must operate in half duplex.

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  1. 21 May, 03:41
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    Correct options are A and C.

    A. SPAN must be disabled on the ports.

    C. The trunking protocol must be the same for all links in the EtherChannel.

    Explanation:

    Option A is one of the conditions that should be met to establish a Layer 2 EtherChannel. An EtherChannel will not form if one of the ports is the Switched Port Analyzer (SPAN) is a SPAN destination port. SPAN is a technique of monitoring network traffic. When trying to configure SPAN the switch gives the following error message: Channel port cannot be a Monitor Destination Port Failed to configure span feature.

    Option C must be met too in order to establish EtherChannel. A trunking protocol should be same for all links in EtherChannel. To configure EtherChannel from trunking ports, it should be made sure that the trunking mode is the same on all the trunks. Ports in an EtherChannel with different trunk modes can function unpredictably.

    Option D is false because all Layer 2 Ethernet ports on all modules support EtherChannels and they do not require the ports to be on the same module or physically adjacent.

    Option E is incorrect because EtherChannel does not operate in half-duplex links. Half-duplex links in EtherChannel are put in the shut out and suspended state.
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