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Refer to the command output shown. You are in a network with a number of switches, and assume that they all have IP-Addresses assigned to their VLAN Interfaces and configured so that you can telnet to any switch and run IOS Commands.
Which two of the following are incorrect?
Even though this switch isn't the Root Bridge for VLAN 1, it is possible that it may be the Root Bridge for a different VLAN
You can look up the IP address of the Root Bridge by using the MAC address with the "sh ip arp [mac address]" command.
The Interface Fa0/1 has had its STP port-cost changed from it's default value
Since the Priority number listed for the Root-ID is the same as the Priority number listed as the local Bridge ID, this switch must be the Root Bridge
In the top section it says the cost to reach the Root Bridge is 4, and it is out my Gi1/2 port. In the bottom it says that my Gi1/2 interface has a cost of 4 as well. Therefore the Root Switch is directly connected to my Gi1/2 interface.
From the information shown, both the Root-Switch and my local switch are using default priorities, therefore, the election for Root Bridge was determined by the lowest MAC-Address
The MAC address of the Root Bridge is 0001.C95D.360B
(1) Priorities for both the Root, and this local Bridge are at default values: Standard 32769 PLUS one(1) because that's the number of this VLAN, and the root was elected because it had a lower MAC-Address, at least between THIS switch and the root, any others MUST be higher, or they would have been the root - - - - -(2) If OUR Switch had been the Root, in the top section under "Root ID" i t would have said: "This bridge is the root", -and- the MAC-Addresses shown in the top and middle sections would have been identical - - - - (3) By default Cisco Switch's run Per-VLAN-STP, and any number of accidental or deliberate, factors could have resulted in this switch being the Root-Bridge for a different VLAN - - - - - - -(4)There may be some strange cases where, where the cost-to-root, and the interface cost on a single hop don't match, but I can't think of any, so I hedged with 'probably; - - - - - - - - - As long as IP was configured and telnet password set, then you could hop your way to the root with CDP-Neighbors & telnet - - - - - - - - - -(5) Internet Fa0/1 is FastEthernet (100Mbps) which has an default STP-Cost of 19, therefore it hasn't been changed
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