Which are valid configurable VLAN ID numbers for 802.1Q networks?
A. 0-1005
B. 1-4094
C. 0-4095
D. 1-1001
Correct Answer: B
Explanation/Reference:
Answer:
IEEE 802.1Q supports configuring VLAN IDs 1 through 4094.
The 802.1Q standard specifies support for a maximum of 4,094 VLANs. (IDs 0 and 4095 are reserved.) Therefore, ID values of 1-4094 are assignable. In contrast, the valid range of configurable ISL VLANs is 1-1001. The following is a summary of VLAN IDs:
0 and 4095: Reserved
1: Cisco default management
2-1001: Available for Ethernet VLANs
1002-1005: Defaults for FDDI and Token Ring VLANs
1006-4094: Extended range available for Ethernet VLANs (802.1Q only)
Recognizing the differences between supported VLAN ID ranges highlights several issues in constructing a network of both ISL and 802.1Q VLAN networks. Ethernet VLAN IDs above the supported ISL range must be mapped to IDs within the range supported by ISL. Among other limitations, you are limited to eight mappings. This process of mapping 802.1Q to ISL VLAN IDs will further restrict and define which IDs are available to be used.
Objective:
Layer 2 Technologies Sub-Objective:
Configure and verify VLANs
References:
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide > Configuring Access and Trunk Interfaces
Explanation/Reference:
Answer:
IEEE 802.1Q supports configuring VLAN IDs 1 through 4094.
The 802.1Q standard specifies support for a maximum of 4,094 VLANs. (IDs 0 and 4095 are reserved.) Therefore, ID values of 1-4094 are assignable. In contrast, the valid range of configurable ISL VLANs is 1-1001. The following is a summary of VLAN IDs:
0 and 4095: Reserved
1: Cisco default management
2-1001: Available for Ethernet VLANs
1002-1005: Defaults for FDDI and Token Ring VLANs
1006-4094: Extended range available for Ethernet VLANs (802.1Q only)
Recognizing the differences between supported VLAN ID ranges highlights several issues in constructing a network of both ISL and 802.1Q VLAN networks. Ethernet VLAN IDs above the supported ISL range must be mapped to IDs within the range supported by ISL. Among other limitations, you are limited to eight mappings. This process of mapping 802.1Q to ISL VLAN IDs will further restrict and define which IDs are available to be used.
Objective:
Layer 2 Technologies Sub-Objective:
Configure and verify VLANs
References:
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide > Configuring Access and Trunk Interfaces
