What is the maximum number of VLANs that can be configured on a Cisco switch?

What is the maximum number of VLANs that can be configured on a Cisco switch?

• A. 128
• B. 256
• C. 1024
• D. 4096

Answer: (D)

Cisco switches allow for configuration of up to 4096 VLANs. This is rooted in the use of a 12-bit VLAN identifier, which can represent values ranging from 0 to 4095. However, while there are 4096 possible VLAN IDs, certain IDs are reserved for specific purposes, such as VLAN 0 (priority tagging) and VLAN 4095 (reserved for internal use), which means that the practical number of usable VLANs is slightly fewer than 4096. Nonetheless, when discussing the theoretical maximum, 4096 is correct, as it reflects the total range of identifiers that can be utilized in VLAN configurations. Conversely, the other options represent much lower VLAN limits that are not applicable to modern Cisco switches. Closer examination reveals that practical implementations often allow full utilization of the VLAN range, and specific switch capabilities can even extend beyond the basic understanding of 4096 VLANs when considering features like private VLANs or alternative tagging methods.

Cisco switches allow for configuration of up to 4096 VLANs. This is rooted in the use of a 12-bit VLAN identifier, which can represent values ranging from 0 to 4095. However, while there are 4096 possible VLAN IDs, certain IDs are reserved for specific purposes, such as VLAN 0 (priority tagging) and VLAN 4095 (reserved for internal use), which means that the practical number of usable VLANs is slightly fewer than 4096. Nonetheless, when discussing the theoretical maximum, 4096 is correct, as it reflects the total range of identifiers that can be utilized in VLAN configurations.

Conversely, the other options represent much lower VLAN limits that are not applicable to modern Cisco switches. Closer examination reveals that practical implementations often allow full utilization of the VLAN range, and specific switch capabilities can even extend beyond the basic understanding of 4096 VLANs when considering features like private VLANs or alternative tagging methods.