Which two protocol can detect native vlan mismatch errors? (Choose two.)
A. CDP
B. VTP
C. DTP
D. STP
E. PAGP
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Which two protocol can detect native vlan mismatch errors?
A & D
If there is a native VLAN mismatch, Spanning Tree Protocol (STP) places the port in a port VLAN ID (PVID) inconsistent state and will not forward on the link.
NOTE
Cisco Discovery Protocol (CDP) version 2 passes native VLAN information between Cisco switches. If you have a native VLAN mismatch, you will see CDP error messages on the console output.
correct answer are A and D
A and D.
The native VLAN must match on both sides of the trunk link for 802.1Q; otherwise the link will not work. If there is a native VLAN mismatch, Spanning Tree Protocol (STP) places the port in a port VLAN ID (PVID) inconsistent state and will not forward on the link, thus, STP can detect native VLAN mismatch. Answer D
Additionally, Cisco Discovery Protocol (CDP) version 2 passes native VLAN information between Cisco switches. If you have a native VLAN mismatch, you will see CDP error messages on the console output like this:
Dec 9 14:10:21: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/1 (1), with FastEthernet0/2 (301)
Therefore CDP can also detect native VLAN mismatch.
Reference: http://www.ciscopress.com/articles/article.asp?p=29803&seqNum=3