2012年思科认证（CCIE）考试知识复习指导3
1. 3550
Creat VLAN 2000, with a name of V2K, and assign port to this VLAN, Why does this not work?
This does not work because the switch is in server mode. To configure VLANs in the extended range, the switch must be in transparent mode.
2. switchport protected
Use the switchport protected interface configuration command to isolate unicast, multicast, and broadcast traffic at Layer 2 from other protected ports on the same switch.
Port protect, as configured in the previous task, is designed to prevent devices in the same broadcast domain (VLAN) from directly exchanging traffic. Typically this configuration is used in a DMZ environment to prevent compromised devices from attacking the network from within.
3. vlan dot1q tag native
Use the vlan dot1q tag native global configuration command to enable tagging of native VLAN frames on all IEEE 802.1Q trunk ports. Use the no form of this command to return to the default setting.
vlan dot1q tag native
When enabled, native VLAN packets going out all IEEE 802 IEEE 802.1Q trunk ports are tagged.