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Which of the following statements is true with regard to ISL and 802.1q?

1. 802.1q encapsulates the frame with control information; ISL inserts an ISL field along with tag control information.
2. 802.1q is Cisco proprietary.
3. ISL encapsulates the frame with control information; 802.1q inserts an 802.1q field along with tag control information.
4. ISL is a standard.

Answer :

Final answer:

ISL encapsulates the frame with control information; 802.1q inserts an 802.1q field along with tag control information.

Explanation:

The correct statement regarding ISL and 802.1q is that ISL encapsulates the frame with control information; 802.1q inserts an 802.1q field along with tag control information. ISL, which stands for Inter-Switch Link, is a Cisco proprietary protocol used to encapsulate Ethernet frames on a trunk link. On the other hand, 802.1q is an industry standard protocol for VLAN tagging.

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