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DTP and VLAN Frame Tagging protocols ISL, dot1.q ⋆ IpCisco
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VLAN InterSwitch Link (ISL) Protocol Analysis
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Configuring Routing Between VLANs with Inter-Switch Link Encapsulation [ Cisco IOS Software Releases 12.4 Mainline] - Cisco Systems
ISL vs dot1q
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DTP and VLAN Frame Tagging protocols ISL, dot1.q ⋆ IpCisco
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