Why did you add your question to this very old discussion, which does not really relate to the question that you are asking? It would have been more effective if you had started a new discussion and had been able to give it a title which reflected what you want to ask.
I hope that you will find this explanation helpful:
- your telnet client will formulate a packet to initiate telnet to the switch (application layer) and pass the data to the transport layer which builds a layer 4 leader and selects 23 as the destination port and selects some value as the source port.
- it passes the packet to the network layer which builds a layer 3 header and puts the switch IP address as the destination and puts your IP address as the source.
- it passes the packet to layer 2 which will build a layer 2 header and put the switch MAC address as the destination MAC and put your MAC as the source MAC. If layer 2 does not yet know the MAC for the switch then it will do an ARP request for the switch.
- it passes the frame to layer 1 which transmits the data on the physical media.
- the switch layer 1 receives the data and passes the frame to layer 2.
- layer 2 verifies that the destination MAC is found on that device and then strips the layer 2 header and passes the packet to layer 3.
- layer 3 verifies that the destination IP address is a local address and then strips the layer 3 header and passes the packet to layer 4.
- layer 4 evaluates the header, strips the header, and based on the destination protocol being 23 will pass the data to the telnet server application.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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