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CCNA 640-802 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?
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A. Source Port Number B. VLAN-ID C. Destination port number D. Destination network number
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Ans: 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.