Computer Networking
You are working with a network that has the network ID 10.9.0.0 and contains 73 networks. In the next year, you will be adding an additional 27 branch offices to your company. For simplified management, you want to keep the most possible hosts per subnet. Which subnet mask should you management, you want to keep the most possible hosts per subnet. Which subnet mask should you use?

255.224.0.0
255.240.0.0
255.254.0.0
255.252.0.0
255.248.0.0

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Computer Networking
What is the purpose of Spanning Tree Protocol in a switched LAN?

To prevent switching loops in networks with redundant switched paths
To manage the VLAN database across multiple switches
To create collision domains
To prevent routing loops in networks with redundant paths
To provide a mechanism for network monitoring in switched environments

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