i am trying to set up a frame relay hub and spoke topology in my home lab
i have two 2600 routers with wic-1t cards and a one 2520 frame relay router
My question how do i connect them physically back to back with a db60
dce/dte cable to make a hub and spoke network
should it be one physical connection with db60 cable from 2520 router which acts as a hub to the one 2620 router or two physical connection from 2520 to the the two 2620 routers
When I think of a hub-and-spoke topology in the lab, I usually think of four routers rather than three. One of the "routers" - the 2520 - would act as a frame-relay switch, not as a router. Let us call that box "FRS".
Let us call the other three routers R1, R2, and R3. You could connect R1 to FRS-S0, R2 to FRS-S1, and R3 to FRS-S2. You do this with three DB60 back-to-back cables, with the DCE ends on FRS, and the DTE ends on your routers.
Now decide which router is the hub, say R1. Make two frame-relay PVCs: one R1<-->R2, and one R1<-->R3. There you have a hub-and-spoke topology with R1 as the hub.
You could, I suppose, eliminate the frame-relay switch by configuring the links back-to-back, but that is not the usual way to set it up in the lab - nor in real life. I suspect you would then be spending more time trying to get the back-to-back connections working than studying hub-and-spoke. And in any case, if you are using this to study for an exam I fear it might too different from the standard topology, and might cause confusion.
If I were you I would try and get a third 2620.