I got to thinking after I wrote this post. I was thinking now its pretty easy to know what to do if I have multiple devices on one switch and a single device on another switch like a server or router.
However what about if you had say multiple devices on each switch. For example Switch A has four PC connected and then Switch B has four PC connected and Switch A and B are connected by a 4 port etherchannel?
I know you would sit one side or the other side up as src-IP/mac but after setting that up would you set the other side up also as src-ip/mac or just set it up as dst-ip/mac or would it even matter one way or another when setting up the second device?
would it use a random port on the way back or would it be forced to use the same port that it received the information on when returning.
If it was forced to use the same port to return then it does not matter what you choose on the other device src or dst because its going to do what its going to do.
Its more of a curriousity question and how to answer a question where there is multiple devices on both sides.
I guess normally traffic is going somewhere and not being sent out randomly which is why we have IP addresses and Mac Addresses even UDP traffic while not controlled is still going somewhere specifically.
but if these are computers that might be talking to different computers at different times then that scenario could happen and if that’s the case I would think you would set both sides to src-ip/mac and whoever setup the initial data when the other device on the other switch responded it would use that same port to speak back.
I think I read something about once a connection between devices Is used with etherchannel the port is normally used for that connection so that load balancing is not truly load balancing.
I don’t want to get to much in the weeds here on this question just wonder how I would answer a question like that with multiple devices on both sides!
My guess is that you sit both sides up as src-ip/mac however the connection is going to use a single port for all the communication between whatever two devices happen to be communicating at the time. So in other words it will act like a src-ip/mac to a dst-ip/mac. However it needs to be setup as src on both sides because of the initiation of communication from multiple devices.
I woke up this morning started studying and had another similar practice exam question from boson on ether-channel I am going to stare at this a bit this morning as I try to wake up as it has some good information as well see below: