How is provided master redundancy on a stacked switches?

Question:
How is provided master redundancy on a stacked switches?

• 1:N
• N:1
• 1:1
• 1+N

Explanation: 1:N master redundancy: Every switch in the stack can act as the master. If the current master fails, another master is elected from the stack.

1:N master redundancy allows each stack member to serve as a master, providing the highest reliability for forwarding. Each switch in the stack can serve as a master, creating a 1:N availability scheme for network control. In the unlikely event of a single unit failure, all other units continue to forward traffic and maintain operation.

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3750-series-switches/prod_white_paper09186a00801b096a.html

Note:

N+1 simply means that there is a power backup in place should any single system component fail. The ‘N’ in this equation stands for the number of components necessary to run your system. The ‘+1’ means there is one independent backup should a component of that system fail. An example of “N+1” is your family has 5 members, so you need 5 cups to drink. But you have one extra cup for redundancy (6 cups in total) so that if any cup breaks, you still have enough cups for the family.

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