Question of the Day: July 17, 2009

Q: What are the differences between DOT1Q and ISL?

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< 1. Dot1q is IEEE standard, ISL is Cisco-proprietary. 2. Dot1q has the concept of a Native VLAN which doesn't tag the native vlan, ISL does not, it encapsulates all frames. 3. Dot1q tags the frame, ISL encapsulates it.

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