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Difference between L2 VPN and L3 VPN

If you want to access the specific resources, you need to use L3 VPN.
If you want to access the entire resources, you need to use L2 VPN.


Example 1: 

With a L2 VPN, site A and site B, look act and feel like they are on the common L2 network together.   A router at site A can be an OSPF neighbor with a router at site B, as they appear directly connected.

With a L3 VPN, we don’t have a direct connection between sites at L2.    With a L3 VPN, we peer with the SP edge, and by learning routes from the SP, we have L3 connectivity between sites A and B.


Example 2:

Purpose of both the way of VPN connectivity is same, to connect two different site. The only difference is the way we connect both the site together for intercommunication.

In both the VPN stlye we use Service provider network to traverse from one site to other.

L3 VPN: Here we make direct connectivity with edge device of service provider, and this we have to do at both the end. Next we have to share our local routes with Service provider, which eventually transmitted to the other end of your VPN (i.e. your other site). So here service provider knows about our local routes. This way both the site have each others routes, making it L3 connectivity (As we have L3 routes)

L2 VPN: Connectivity in L2 VPN looks like both the site are on same L2 network together. To achive this Service provider make a predefined virtual connection in their network, known as pseudowire connection, between your two sites. So here we don’t have to share our local routes with service provider, so service provider stays transparent with about our internal routes. In L2 VPN communication happens in the same way we do at our single site local network.

what is difference netbios vs SMB

Windows supports file and printer sharing traffic by using the Server Message Block (SMB) protocol directly hosted on TCP. This differs from earlier operating systems, in which SMB traffic requires the NetBIOS over TCP (NBT) protocol to work on a TCP/IP transport

What are deference between bandwidth and speed

Bandwidth is the amount of Data and speed is the rate the bandwidth is transferred.

To understand this, let us take one example.
Let us assume You have a company ABC with 5 users.
You have taken beam ISP (internet) 5mbps line.
Here 5mbps is the fixed speed provided by beam to you, which is nothing but we say it as “Bandwidth”.
Your company have 5users right, and all are connected to same network.
Hear each user will get 1mbps speed, this we can say as speed.
Hope now you understood the difference between bandwidth and speed.


Bandwidth= width of the road. Speed = is how fast you can travel.

In terms of roads, bandwidth is how wide the road is for vehicles to move, and speed is how fast the vehicle can move


Speed is the rate the card interface put data in the link, bandwidth is the real amount of traffic u are allowed to put in the media, so u can have an Ethernet link to your service provider with speed 100 Mbps, but u just bought 30Mbps with ur provider, that is the bandwidth.

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