Which two statements about switch stacking are true? (Choose two)
A. The stack is powered by a single power cable
B. The switches are connected in a daisy-chain fashion
C. The first and last switch in the stack must be connected to one another
D. The switches are connected by crossover cables
E. The switches must be fully meshed
If the first and last switch are not connected together then the stack will fail if any of the middle switches goes down. Therefore C is also correct
On this link everything is explained:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/int_hw_components/configuration_guide/b_int_3se_3850_cg/b_int_3se_3850_cg_chapter_01000.pdf
It turns out that a stack up to four switches it can be powered by a single power cable and the default mode is power sharing mode.
Here is a video that explains all this step-by-step:
https://www.youtube.com/watch?v=E_WzxAuVn-Q
Below are the StackPower Modes explained:
StackPower Modes
You can configure the power stack to run in one of two modes:
• In power-sharing mode (the default), all input power is available to be used for power loads. The total
available power in all switches in the power stack (up to four) is treated as a single large power supply,
with power available to all switches and to all powered devices connected to PoE ports. In this mode,
the total available power is used for power budgeting decisions and no power is reserved to accommodate
power-supply failures. If a power supply fails, powered devices and switches could be shut down (load
shedding).
• In redundant mode, the power from the largest power supply in the system is subtracted from the power
budget, which reduces the total available power, but provides backup power in case of a power-supply
failure. Although there is less available power in the pool for switches and powered devices to draw
from, the possibility of having to shut down switches or powered devices in case of a power failure or
extreme power load is reduced.
I hope this helps 🙂
Yep
10x jani
I beg to differ that they are powered by a single power cord.
Cisco 3850’s have dual ps and can use stack power.
Brocade and Extreme switch stacks.
Show me an example of a single power cord for multiple switches.
Answer B C.
i agree with chris.
I do also agree with Chris. I’ve worked with the stacked 3850’s and they look like this:
https://www.cisco.com/c/dam/en/us/td/i/300001-400000/330001-340000/334001-335000/334331.eps/_jcr_content/renditions/334331.jpg