Refer to the exhibit, Communication between London and New York is down. Which command set must be applied to resolve this issue? A. B. C. D.

Question

Exhibits

Options

• ANewYork(config)#int f0/1 NewYork(config)#switchport trunk encap dot1q NewYork(config)#end NewYork#
• BNewYork(config)#int f0/1 NewYork(config)#switchport mode trunk NewYork(config)#end NewYork#
• CNewYork(config)#int f0/1 NewYork(config)#switchport nonegotiate NewYork(config)#end NewYork#
• DNewYork(config)#int f0/1 NewYork(config)#switchport mode dynamic desirable NewYork(config)#end NewYork#

• A
  81% (17)
• B
  5% (1)
• C
  10% (2)
• D
  5% (1)

Explanation

The correct answer is A because the exhibit likely shows a trunk encapsulation mismatch - one side is configured for ISL and the other for 802.1Q (dot1q), or the encapsulation type has not been set at all on a router/switch that supports multiple encapsulation types. On platforms that support both ISL and dot1q (such as older Catalyst switches or routers), you must explicitly set the trunk encapsulation with 'switchport trunk encap dot1q' BEFORE you can set the mode to trunk. Without matching encapsulation, the trunk cannot form and communication fails.

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