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| Question ID 18579 | Refer to the exhibit.
All switches have default bridge priorities, and originate BPDUs with MAC addresses as
indicated. The numbers shown are STP link metrics. Which two ports are in blocking state
after STP converges? (Choose two.)
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| Option A | the port on switch SWD that connects to switch SWE
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| Option B | the port on switch SWF that connects to switch SWG
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| Option C | the port on switch SWD that connects to switch SWC
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| Option D | the port on switch SWB that connects to switch SWD
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| Correct Answer | C,D |
Explanation Explanation: This is a scenario that wants you to demonstrate understanding of the Root switch and Root port election process. So, its best to start with where the root switch will be and work down from there. Its 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 its important to understand which ports will be put into the blocking state. Since SWD is a higher 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 ID 18580 | Which three options are sources from which a SPAN session can copy traffic? (Choose three.)
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| Option A | ports
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| Option B | EtherChannels
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| Option C | VLANs
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| Option D | subnets
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| Option E | primary IP addresses
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| Option F | secondary IP addresses
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| Correct Answer | A,B,C |
Explanation Explanation: ✑ SPAN Sources The interfaces from which traffic can be monitored are called SPAN sources. Sources designate the traffic to monitor and whether to copy ingress, egress, or both directions of traffic. SPAN sources include the following: Ethernet ports Port channels The inband interface to the control plane CPU You can monitor the inband interface only from the default VDC. Inband traffic from all VDCs is monitored. VLANs When a VLAN is specified as a SPAN source, all supported interfaces in the VLAN are SPAN sources. Remote SPAN (RSPAN) VLANs Fabric port channels connected to the Cisco Nexus 2000 Series Fabric Extender Satellite ports and host interface port channels on the Cisco Nexus 2000 Series Fabric Extender These interfaces are supported in Layer 2 access mode, Layer 2 trunk mode, and Layer 3 mode. Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx- os/system_management/configuration/guide/sm_nx_os_cg/sm_14span.html#wp1239492