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   CCNA™ (200-125) VLAN/VTP Practice Questions

 

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Q2: Your switched network is using Inter-Switch Link (ISL) as VLAN trunking protocol. Which following must be a part of ISL header field?

A. Source Port Number

B. VLAN-ID

C. Destination port number

D. Destination network number

  Correct Answer: B

 

Explanation:

Inter-Switch Link (ISL) is one of the VLAN trunking protocols used for switched VLAN networks. It uses frame tagging to identify the VLAN. ISL encapsulates the original Ethernet frame, and a VLAN-ID is inserted into the ISL header. 

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