Its setup nicely because the lowest mac address

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It’s setup nicely because the lowest MAC address switch starts at the top and then the lower priority/higher mac addresses move down the architecture. SWA wins the root election and of course all ports in SWA are forwarding. SWB introduces the possibility for a switching loop so it’s important to understand which ports will be put into the blocking state. Since SWD is a higher Cisco 400-101 Exam "Pass Any Exam. Any Time." - 56
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MAC address it will end up with a blocked port connected to SWB to prevent a loop: and this is one of the correct answers. To prevent the possibility of another potential switching loop, SWD again ends up with the higher MAC address so blocking the link between D and C prevents a B/C/D switching loop. QUESTION NO: 72 Which statement is true about IGMP? A. Multicast sources send IGMP messages to their first-hop router, which then generates a PIMjoin message that is then sent to the RP. B. Multicast receivers send IGMP messages to their first-hop router, which then forwards theIGMP messages to the RP. C. IGMP messages are encapsulated in PIM register messages and sent to the RP. D. Multicast receivers send IGMP messages to signal their interest to receive traffic for specificmulticast groups. Answer: DExplanation: In the example shown above, the receivers (the designated multicast group) are interested in receiving the video data stream from the source. The receivers indicate their interest by sending an Internet Group Management Protocol (IGMP) host report to the routers in the network. The routers are then responsible for delivering the data from the source to the receivers. ReferencE. Cisco 400-101 Exam "Pass Any Exam. Any Time." - 57
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QUESTION NO: 73 Which two statements are true about RSTP? (Choose two.) A. By default, RTSP uses a separate TCN BPDU when interoperating with 802.1D switches. B. By default, RTSP does not use a separate TCN BPDU when interoperating with 802.1D switches. C. If a designated port receives an inferior BPDU, it immediately triggers a reconfiguration. D. By default, RTSP uses the topology change TC flag. E. If a port receives a superior BPDU, it immediately replies with its own information, and no reconfiguration is triggered. Answer: B,DExplanation: The RSTP does not have a separate topology change notification (TCN) BPDU. It uses thetopology change (TC) flag to show the topology changes. ReferencE. -1_9_ea1/configuration/guide/scg/swmstp.html QUESTION NO: 74 Refer to the exhibit. Which two statements are true about the displayed STP state? (Choose two.) A. The STP version configured on the switch is IEEE 802.1w. B. Port-channel 1 is flapping and the last flap occurred 1 minute and 17 seconds ago. C. The switch does not have PortFast configured on Gi0/15. D. BPDUs with the TCN bit set are transmitted over port channel 1. Cisco 400-101 Exam "Pass Any Exam. Any Time." - 58
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Answer: C,D
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