This diagram is cut off at the top, right? The given answer is incorrect because a switch does not become the root bridge by having the highest MAC address. The first rule is that the switch with the lowest priority becomes the root bridge, but if all switches have the same priority then the switch with the lowest MAC becomes the root bridge

I had this question on my exam, the cut off info is: SW1 has prioroty 8192 and MAC ending with 41 SW2 has priority 16384 and MAC ending with 43 So SW4 will become a root bridge, but not because it's priority is highest, broken answer i guess, may be just bad wording as always

To determine which switch becomes the root bridge in a Rapid PVST+ network, the switch with the lowest bridge ID is selected as the root bridge. The bridge ID is a combination of the priority value and the switch MAC address. The priority value is a 4-bit value that can be set in increments of 4096, with the default value being 32768. In the exhibit, the switch priority values are not explicitly shown, so we must assume that the default value of 32768 is being used. The bridge ID of each switch is: SW1: Priority 32768, MAC address 001c.c4b6.4f80, Bridge ID 32768.001c.c4b6.4f80 SW2: Priority 32768, MAC address 001c.c4d6.b680, Bridge ID 32768.001c.c4d6.b680 SW3: Priority 32768, MAC address 001c.c4b6.e300, Bridge ID 32768.001c.c4b6.e300 SW4: Priority 4096, MAC address 000e.0c6f.9c00, Bridge ID 4096.000e.0c6f.9c00 Since SW4 has the lowest bridge ID, it becomes the root bridge. Therefore, the correct answer is A. SW4, because its priority is the highest and its MAC address is lower.

lowest bridge/switch priority value = Higher priority to be picked as the root bridge. The phrasing is confusing. I don't think they mean the value itself but rather the priority itself.

What are you doing here if you've already passed through the fire

Selected Answer: A Tricky question! Do not mix up highest priority with highest priority value! A high STP priority = the lowest priority value in the BID.

Selected Answer: B Lowest priority then lowest MAC

Selected Answer: A A. SW4, because its priority is highest and its MAC address is lower

in STP the criteria with lowest(1.priority then 2.MAC address) wins SW1 and SW2 has no details though...

Man I regret paying for this website

highest priority priority is highest OK cisco

Switch 4 is the ANSWER!

C and D are the wrong answers, the correct answer is A, higher priority means lower priority number + lower MAC = Lower Bridge ID

This diagram is cut off at the top

There is no correct answer. Insufficient information. The options are not known to be accurate statements, so there's no way to tell.

Selected Answer: B It´s B

It's true, now I get it!

Selected Answer: B The layer 2 device with the lowest bridge ID (bridge priority + MAC address) is elected as the root. -All in One CCT/CCNA Routing and Switching (B) SW1 has the LOWEST PRIORITY. We're done!

Selected Answer: A The switch with the Lowest Bridge ID is elected as the root bridge. Bridge ID is made up of both the MAC address and Bridge priority. Bridge priority takes precedence over MAC address when choosing the root bridge. A lower switch priority value means a higher priority to be chosen as the root bridge A lower MAC address means a higher priority to be chosen as the root bridge B & C are wrong If 2 switches have the same priority, then the switch with the lowest MAC address will be selected as the root bridge. D is incorrect because SW3 has the same priority as SW4 but SW4 has a lower MAC address giving it a lower bridge ID. A is the correct answer PS: the answer might differ if the exhibit is complete, it's cut off in our case but the steps to solve the question are the same. https://ccna-200-301.online/stp-operations/

PS: The default priority value for all Cisco switches is the decimal value 32768. The range is 0 to 61440 in increments of 4096.

last question for me)))

Even with that logic the given answer can't be right, SW4 bridge is higher than sw3 so there's no way SW4 becomes root

your answer is wrong. look at the exhibit again and notice the actual priority values shown and you'll see that the bridge priority value for SW4 is the lowest, meaning its actual priority is the highest.

Wrong. Layer two stp priority is always lower. Layer 3 like ospf is higher. The lower the priority, the more likely it becomes the root. example: a switch with the priority of 0 will always become the root and override the spanning tree root primary command.

I think it's a mistake/typo in the answer wording.

That explains a lot. I thought it was a mistake in the wording. Why does Cisco have to deliberately make close conflicting terms like this.

Thank you

Thank you

But its the lowest BID, including priority (lowest value) and mac address (lowest value). So the lowest priority value = Highest priority.

Selected Answer: A A is the right answer. Lower priority value is viewed as "better" priority (thus higher). And priority matters more than the MAC address. They try to trick the reader by saying "SW4 has the HIGHEST priority" (It has the highest priority because it has the LOWEST priotity value). The MAC address does not matter once we know which switch has be best priority. Cisco is stupid. I am seriously rethinking whether I should pay for any Cisco exam.