STP Questions 2
Question 1
What should be used to elect a root bridge if all parameters are left at default values?
A. the highest MAC address
B. the lowest MAC address
C. the highest interface number
D. the lowest interface number
Answer: B
Question 2
Your company is connecting some switches. What is the potential problem and the solution for this? (Choose two)
A. routing loop
B. switching loop
C. Spanning-tree Protocol
D. VLAN Trunking Protocol
E. Dynamic Trunking Protocol
Answer: B C
Question 3
Given the following information:
| SwitchA: + Priority: 4096 + MAC: 00aa.bbcc.ddaa |
SwitchB: + Priority: 12288 + MAC: 00aa.bbcc.bb |
| SwitchC: + Priority: 32768 + MAC: 00aa.bbcc.ddee |
SwitchD: + Priority: 32768 + MAC: 00aa.bbcc.ddff |
Which switch provides designated port role for the network segment that serves the server?
A. SwitchA
B. SwitchB
C. SwitchC
D. SwitchD
Answer: C
First, the question asks what switch services the printers, so it can be SwitchC or SwitchD which is connected directly to the Server.
Next, by comparing the MAC address of SwitchC and SwitchD we found that the MAC of SwitchC is smaller. Therefore the interface connected to the Server of SwitchC will become designated interface and the interface of SwitchD will be blocked. The picture below shows the roles of all ports:
DP: Designated Port
RP: Root Port
BP: Blocked Port
(Please notice that SwitchA will become the root bridge because of its lowest priority, not SwitchC)