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

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Computer Networking
You want to create a standard access list that denies the subnet of the following host: 172.16.50.172/20. Which of the following would you start your list with?

access-list 10 deny 172.16.48.0 0.0.15.255
access-list 10 deny 172.16.0.0 0.0.255.255
access-list 10 deny 172.16.64.0 0.0.31.255
access-list 10 deny 172.16.48.0 255.255.240.0

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