obviously i'm a newb. but i'm pulling my hair out trying to understand cisco. in order to figure things out i bought a cheap 2501 router. and i have no clue what its for.
#1. it has no ethernet port. So it must not go on a network? No thats untrue! the AUI port has a tranceiver you can buy to get it onto the network. But that's all the AUI port can do. So instead of putting an ethernet port they put an AUI port. Great thanks, the tranceiver costs more than the whole router! why didn't cisco put a ethernet port to begin with? whats so much better about having a AUI port?
#2 You cannot configure subinterfaces on the 2501. ie you can't do e0.1 or e0.2 why? because there is no encapsulation command for subinterfaces and it wont let you assign ip addressess to subinterfaces until you set an encapsulation method. So if you ever thought "router on a stick" WRONG, 2501 has no capability of doing that. its not compatible with vlans period.
#3 "but it has 2 serial ports", so what? i can connect to another router? this lets me do what? share router resources while at a throughput cost? or is this so i can give my router another AUI port,err, i mean ethernet port? why not just give it another ethernet port then? obviously cisco thought serial>ethernet and aui>ethernet but i don't understand their thought process at all on that!
#4 again with only 1 ethernet port you can't connect one end of this router to the internet, and the other end to your lan, theres not enough ports. so forget saying you use it as a firewall or special ACL's. how would the topology look? is your internet connect to a switch which then goes to your 2501? then your 2501 filters and sends it back to the switch? won't the switch just broadcast everything to begin with essentially bypassing the router anyways? or would you hook this router up next to a router already, and if thats the case then why not put a firewall on that router, why introduce the 2501. it's a stub network and its pointless in any topology.
so... wtf is the point of the 2501. obviously i'm missing a HUGE part of cisco routing. i know i'll smack myself in the head for not thinking of it. but grrr i'm so confused, what in the world is this thing used for!?