What primary advantages does the 802.1Q Trunking Protocol offer compared to ISL?

The 802.1Q Trunking Protocol offers several advantages over Inter-Switch Link (ISL) protocol, primarily its industry-standard status and greater interoperability among different vendors' equipment. Unlike ISL, which is Cisco proprietary, 802.1Q is widely adopted, allowing for seamless integration in mixed-network environments. Additionally, 802.1Q encapsulates VLAN tags within standard Ethernet frames, reducing overhead and enabling more efficient use of bandwidth. This protocol also supports a larger number of VLANs, enhancing scalability for modern networks.