2.4 Configure, verify, and troubleshoot VLANs (normal/extended range) spanning multiple switches


2.4.a Access ports (data and voice)

We will configure VLANs in the normal range (1-1005) and the extended range (1006-4094).
For PC1 and PC2 to communicate only L2 connectivity is needed as they are on the same VLAN.
The steps are as follows:
1.) Configure PC1 and PC2 to be on access ports and assign the voice and access VLANs

interface Ethernet0/0
 switchport mode access
 switchport access vlan 1006
 switchport voice vlan 10

2.) Configure a trunk port on each switch

interface Ethernet0/1
 switchport trunk encapsulation dot1q
 switchport mode trunk

That’s it! As both switches contain the VLANs 1006 and 10 they will forward the traffic between switches seamlessly.

2.4.b Default VLAN

The default VLAN is 1. It cannot be disabled and poses a security risk as a lot of Cisco services run on the default VLAN. It is recommended to set all ports to a different VLAN and to assign a single unused port to VLAN 1.

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