Exam 350-601 topic 1 question 427 discussion

C - the switch drops the traffic that exceeds the bandwidth of the interface

https://www.cisco.com/c/en/us/td/docs/dcn/nx-os/nexus9000/102x/configuration/layer-2-switching/cisco-nexus-9000-nx-os-layer-2-switching-configuration-guide-102x/m-configuring-traffic-storm-control.html

https://www.cisco.com/c/en/us/td/docs/dcn/nx-os/nexus9000/102x/configuration/layer-2-switching/cisco-nexus-9000-nx-os-layer-2-switching-configuration-guide-102x/m-configuring-traffic-storm-control.html Specify the traffic storm control level as a percentage of the total interface bandwidth: The pps range can be from 0 to 200000000. The optional fraction of a level can be from 0 to 99. 100 percent means no traffic storm control. 0.0 percent suppresses all traffic.

D) Because server1 is connected to a 1Gb (port-channel) and storm control is applied only to de Eth0 . It seems that port-channel has two interfaces probably Eth0+Eth1 and storm control is only applied on Eth0. Then D) forwards half of the traffic seems correct.

Answer is C: C. drops all of the excess traffic It talks about traffic that exceed the bandwidth of the interface, so regardless of traffic type all the excess has to be dropped.

A for sure. Supress all traffic. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus3548/sw/layer_2_switching/60x/b_Cisco_N3548_Layer_2_Switching_Config_602_A1_1/b_Cisco_N3548_Layer_2_Switching_Config_602_A1_1_chapter_01011.pdf

A Traffic storm control has the following configuration guidelines and limitations: You can configure traffic storm control on a port-channel interface. Specify the traffic storm control level as a percentage of the total interface bandwidth: The level can be from 0 to 100. The optional fraction of a level can be from 0 to 99. 100 percent means no traffic storm control. 0.0 percent suppresses all traffic.

Since the storm level is set to 0.0 percent, it should suppress all traffic(blackhole, basically). If it were set to 50 percent, that would allow half the traffic to pass through. Unless I'm reading this wrong: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/security/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_Security_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_Security_Configuration_Guide_7x_chapter_010001.html#task_1101084

Guidelines and Limitations for Traffic Storm Control Traffic storm control has the following configuration guidelines and limitations: You can configure traffic storm control on a port-channel interface. Specify the traffic storm control level as a percentage of the total interface bandwidth: The level can be from 0 to 100. The optional fraction of a level can be from 0 to 99. 100 percent means no traffic storm control. 0.0 percent suppresses all traffic.

Taking in to consideration that streaming is probably a Multicast traffic, I believe C is a correct answer, but like warCzert did wrote that, question is wierd.

Weird question. If we are talking about storm control on N9k, normal traffic will not be supressed. Broadcast, Multicast and unknown unicast will be dropped all the time because of zero level storm control.