VLAN Numbers (ENCOR 350-401 Review)

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This video series follows the CCNP and CCIE Enterprise Core Official Cert Guide (ENCOR 350-401) and reviews the topics. This video discusses VLAN numbers.

0:00 VLAN ID (12 bits)
0:28 VLAN ID 0
1:31 Default VLAN (VLAN 1)
2:23 VLAN ranges
3:03 Configuring a VLAN
5:39 Summary

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  1. Network Playroom
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Комментарии
Автор

NOTE: At 0:13, it is said that 12 bits provide 4, 095 unique values. This is incorrect! 12 bits provide 4, 096 unique values, UP TO the value of 4, 095. The values are in the range from 0 to 4, 095.

From Wikipedia (IEEE 802.1Q):

A 12-bit field specifying the VLAN to which the frame belongs. The values of 0 and 4095 (0x000 and 0xFFF in hexadecimal) are reserved. All other values may be used as VLAN identifiers, allowing up to 4, 094 VLANs.

The reserved value 0x000 indicates that the frame does not carry a VLAN ID; in this case, the 802.1Q tag specifies only a priority and is referred to as a priority tag.

The VLAN ID value 0xFFF is reserved for implementation use; it must not be configured or transmitted.

NetworkPlayroom
Автор

Thanks for this. I'm preparing for this exam so this series is timely. Will be following along.

drmanhattan