How many IPv4 multicast groups use the same Ethernet destination MAC address?

Which bits of an IPv4 multicast address are mapped to bits of a MAC address?

A client has been monitoring the network and has observed excessive multicast traffic on many of
the subnets on the PIM-DM enabled network. Why would changing to PIM Sparse mode reduce
multicast traffic on this network?

Referring to the exhibit,

where would you enable IGMP snooping?

You upgrade a network from STP to RSTP to improve the reconvergence time. When a link or port
in the network fails, the network reconvergence is improved. However, the reconvergence time
when the Root Bridge node fails shows no improvement.
Why does this happen?

Users often make the mistake of connecting devices to your network without telling you. You want
to prevent spanning tree participation between your network and user devices.
Which feature prevents user devices from participating?

You are running 120 VLANs across your Brocade MLXe network. Each VLAN has its own
spanning tree instance. There is a need to double the number of VLANs on the network.
Which two actions permit the addition of the new VLANs? (Choose two.)

You are about to add links to your Spanning Tree Protocol (STP) network. Some switches will
have multiple links to adjacent switches. You expect STP to manage the topology.

Which three actions are performed by the switch? (Choose three.)

You are managing a spanning tree network. A user connects a small switch to a network port
causing the network to briefly go down; now all the applications run slow.
Which feature should you add to the port to resolve this problem?

You are managing a spanning tree network. A user connects a small switch into a network port
causing the network to briefly go down; now all the applications run slow.
What took place in your network to cause the change in performance?