... © 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0— 4-1 0Importance of Native VLANs© 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0— 4-1 1802.1Q Frame© 2002, Cisco Systems, ... 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0— 4-4 © 2002, Cisco Systems, Inc. All rights reserved. 4VLAN Operation Overview© 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0— 4-5 ObjectivesUpon ... defining VLAN topologies. © 2002, Cisco Systems, Inc. All rights reserved.© 2002, Cisco Systems, Inc. All rights reserved. ICND v2.0— 4-2 0Summary (Cont.)•ISL is a Cisco proprietary protocol to...