CCNA_VLAN_VTP - VLAN (Virtual Local Area Network) creates...

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VLAN (Virtual Local Area Network) – creates separate broadcast domains in a LAN. VLAN use either IEEE 802.1q or ISL (InterSwitch Link) as trunking protocols to transmit VLAN traffic. VLANs use VTP (VLAN Trunking Protocol) to exchange VLAN configuration between the LAN switches. IEEE 802.1q: Inserts a 4-byte header into the Ethernet frame after the source address and recalculate the CRC. This provides increased latency as compared to ISL. Uses a 12-bit VLAN ID in the header Assigns a NATIVE VLAN which is not encapsulated. The default NATIVE VLAN is VLAN 1. Multiple instances of STP (per VLAN) were not originally supported on the 802.1q standard. However, they are now supported by the IEEE 802.1s standard or by the Cisco proprietary PVST+ (Per VLAN Spanning Tree). ISL (InterSwitch Link): Fully encapsulates the entire Ethernet frame Uses a 12-bit VLAN ID in the ISL header Faster than IEEE 802.1q Cisco Proprietary Supports multiple instances of STP per VLAN via PVST+ (Per VLAN Spanning Tree). VTP (VLAN Trunking Protocol):
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This note was uploaded on 08/12/2009 for the course CNT 240 taught by Professor Smith during the Spring '09 term at Cochise College.

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