Remote as in not the one I have consoled into and not adjacent to that switch either (there are 4 "upstream" switches). I have seen suggestions on older posts where it is recommended that we use sh cdp neigh detail to acquire the IP of the remote switch, ping it then check the local switches arp table via sh ip arp however I do not see how this would work. CDP will only provide info on adjacent devices, correct? I am trying to identify the root bridge (PVST) and I only have console access to one switch on the perimiter, no telnet ability. Yes, this is for a test question which really threw me on my first attempt at the CCNA. Any help/suggestions would be greatly appreciated! Thanks!
assuming this is for ccna - its been a while but i'm sure Cisco usually say "assume default values" in these exams. So SPT costs are 10Mbps (100), 100Mbps (19) and 1Gbps (4):
you have access to switch 1:
1. use show spanning-tree vlan X to find cost to Root bridge
2. if switch 1's root bridge cost is either 4,19, or 100 - then the root bridge is switch 2. if not, find the speed of the link between switch 1 and 2 and work out the SPT cost for this link.
3. Deduct the SPT cost worked out in step 2 from the original SPT cost (step 1) - this will give you switch 2's cost to the Root Bridge - if switch 2's root bridge cost is either 4,19, or 100 - then the root bridge is switch 3. if not then the root bridge must be switch 4
maybe Cisco just wanted to check you knew the default values