ccna chapter 9 pdf

ccna chapter 9 pdf.The switchporttrunkallowedvlan command has the following options.1 VLAN ID: The VLAN list, which can be in the form of 2,3,4.100, means that the data traffic of the VLANs specified in the list is allowed to pass on the Trunk link.2 add: Allows data from the newly added VLANs in the original list to pass through the Trunk link.Chapter 8 VLANs. trunk and inter-VLAN routing .113 .3 aU:Allow all VLAN data through the Tnmk link. which is the default configuration 4 except:Allow data from all VLANs other than the specified VLAN through the Trunk link. 5 none:Do not allow data from any VLAN to pass through the Trunk link. 6 remove:Disable data from the specified VLAN in the original list over the Trunk link. Note that if the list of allowed VLANs on a Tnmk link is incorrectly configured, it may cause network connectivity problems.The network connectivity problem may occur. 2) Configure Switch S2. s2(conftg)#interface fastEthernetO/13S2(config-if)#switchport trunk encapsulation dotlq S2(config-if)#switchport mode trank S2(config-if)#switchport trunk native vlan 199 S2( conflg-if>#switchportnonegotiate S2(config-if)#switchport trunk allowed vlan 1-3. [Technique Tfi Key Points].1 When configuring Trunk, both ends of the same link should have the same encapsulation, not ISL at one end and dotlq at the other end. 2 Configure NativeVLAN as a non-existent VLAN, in order to avoid VLAN hopping attacks and improve network security. 3 If the NativeVLANs at both ends of the Trunk link are not the same, the CDP detects the NativeVLAN mismatch and the switch S2 prompts the following message..Dec 8 01:50:20.775: %CDP-4-NAriVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthemetO/13 (1),with SI FastEthemetO/13 (199).