Hello @ankitohc,
In the diagram you provided, the WAN interfaces are the connections to the internet service providers (ISPs). Unlike LAN interfaces, WAN interfaces are typically used to connect to external networks, such as the internet, rather than connecting to local devices within your own network.
VLANs (Virtual LANs) are used to logically segment a local network into separate broadcast domains. They are primarily used within your own network infrastructure to isolate traffic and improve network efficiency. VLANs are usually implemented on LAN interfaces of switches and routers.
Diference between creating VLANs on switches and on WAN interfaces ?
--VLANs on switches are used to logically separate devices within your internal network.
--They allow you to group devices into different broadcast domains, providing security and performance benefits.
--VLANs are created on Ethernet interfaces of switches to segregate traffic from different departments, applications, or security zones.
--VLANs on switches are used for internal network management and organization.
Creating VLANs on WAN Interfaces ?
--Creating VLANs on WAN interfaces is not a common practice because WAN interfaces are usually dedicated to connecting to external networks like ISPs.
--ISPs usually provide a single logical connection on a WAN interface; there's generally no need to segment this connection with VLANs.
--The WAN interfaces are used to connect your local network to the wider internet. VLANs are more about segmenting your own network.
There are no dumb questions when you're learning. Feel free to ask anything you're curious about!
Best regards
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