Hello friends. . .
Welcome to Gate Smashers In this video, we're going to discuss message switching Although the concept of message switching came after circuit switching Means the order in which these switching concepts has arrived is. . .
Circuit switching, After circuit switching, message switching Then packet switching So the concept in circuit switching was, first communication begins and creates a connection When the connection gets fully established, then communication i. e. data transfer starts And circuit switching was actually designed for telephone networks, means the devices are already connected with each other All the devices are already connected, when we have to call or talk then first we have to create a setup there When the setup will get created as a connected way, a point to point communication will create when a point to point communication got created, then you can do data transfer, means you can talk Then came the concept of message switching, when the Store & Forward concept started actually which came in 1960 At around the 1960s, this concept of message switching arrived So the concept of message switching is.
. . That rather than sending the data continuously, we are sending the message one by one Sending messages one by one means it's "Hope by Hope delivery " Means if we have devices connected, let's say Let's say they are connected in any way.
. . Let's say A wants to send data to D So what will happen in circuit switching?
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first a connection will create After the connection will get established, you can transfer the data continuously But in the message, no connection will create between A to D A will simply transmit its message and that message will reach to next hope Next hope is kind of switch. . .
So it reached to switch or router and it took that message, stored it We generally used to use "Store" before on hard disk When this concept started, at that time messages used to get stored intermediately in the hard disk Gradually it got changed into RAM because hard disk is very slow If you are storing data on hard disk, and sending it to the next hope after processing So this is very delayed, it means there used to occur so much delay But now we use the concept of RAM here because RAM is much faster than hard disk So data reached from here to this hope, this hope stored it, processed it which means found its route where to send Then let's say it'll send this side. . .
So it reached to next hope, and this hope will also store and will decide where to send Then it will send the data like this. . .
So this is hope by hope delivery which is totally different from circuit switching There was a disadvantage of reservation in the circuit switching where we have kept bandwidth, CPU & resources reserved And circuit switching, packet switching which is the most important point here, I've already created videos on it I'll share their link with you in the description box So there are not many chances of questions coming on message switching But I'm asking you to do it, so that concept of switching can get complete Because circuit switching, packet and then datagram and virtual which we have already done The last one is message switching so the concept of message switching generally comes before packet switching We modified the message switching and it became packet switching So what is packet switching? . .
. That same message which we were sending before hope by hope by using store and forward Now just divide that message. .
. Means, rather than sending a big message hope by hope, Just divide that message into small packages and there you'll achieve parallelism or pipelining, Means multiple packets can flow parallelly So that reduces delay also and efficiency also increases So, you may not feel the concept of message switching is that much important But packet switching is very important, and I've already completed it, just check it once So the basic point of message switching is that it is the predecessor of a packet, It has a "store and forward" strategy with hope by hope delivery So the advantage with this is that there is no reservation, means efficiency is better than the circuit switching But the delay would be obviously more. .
. Why delay would be more? Because it is "hope by hope", so obviously there will be a delay as every hope is processing it So delay would be always more and efficiency will be also more Because we are not doing reservations here If I'm comparing with the circuit switching, I'm not comparing with the packets but with circuits So we managed the traffic also little bit properly, we won't say that our route will stay the same as this always We are following different routes, we are sending data on different routes So we are using the whole network in the proper way in message switching or packet switching Which was not there in the circuit switching so these are the only main differences in circuit and message switching But if you'll see the difference in message and packet then what we generally do in the packet is, simply rather than sending one big message, we choose to send multiple small packets parallelly on different routes So this is all about the concept of message switching Thank You!
