31 Days Before Your CCNA Exam

76 31 Days Before Your CCNA ExamTable 24-2Trunk Negotiation Results Between a Local and a Remote PortDynamic Dynamic Trunk AccessAuto DesirableDynamic Auto Access Trunk Trunk AccessDynamic Desirable Trunk Trunk Trunk Trunk AccessTrunk Trunk Trunk Trunk Not RecommendedAccess Access Access Not Recommended AccessVTP ConceptsThe name for Cisco’s proprietary VLAN Trunking Protocol (VTP) can be confusing. VTP does notprovide a method for trunking between devices. Instead, VTP is a Layer 2 messaging protocol thatmaintains VLAN configuration consistency by managing the additions, deletions, and namechanges of VLANs across networks. VTP helps with VLAN management and although it makesthe configuration and troubleshooting of VLANs easier, it is not required.The benefits of VTP include the following:■■■VLAN configuration consistency across the networkAccurate tracking and monitoring of VLANsDynamic reporting of added VLANs across a networkFigure 24-4 shows an example of how VTP messages can be sent between the VTP server andVTP clients.Figure 24-4VTP Server Sends Updates to VTP ClientsVTP Domain CCNAVTP Server1. VLAN Added/Deleted2. Change Propagated802.1QTrunk802.1QTrunk802.1QTrunk802.1QTrunkVTP Client VTP Client VTP Client VTP Client3. Synch to Latest Change