Storm Control Flashcards
How does storm control defend against broadcast storms.?
By discarding excess traffic when a certain threshold of unicast, multicast, or broadcast traffic is received on a port.
How is storm control configured?
Port-by-port.
In addition to discarding excess traffic, what actions can storm control take on a port?
Storm control can also shutdown the port, or just send a trap.
When configuring storm control two thresholds can be configured instead of just one. What do this thresholds do?
The first configured threshold value determines when storm control kicks in. The second configured value determines when storm control stops taking action.
What are the two main interface-config commands to enable storm control?
“storm-control broadcast/unicast/multicast level” and “storm-control action”.
The network monitoring application alerts a network engineer of a client PC that is acting as a rogue DHCP server. Which two commands help trace this PC when the MAC address is known? (Choose two)
-switch# show mac address-table -switch# show mac address-table address
What is Storm Control?
Storm Control is a security feature that allows ports to drop broadcast, multicast, or unknown unicast if it crosses some threshold.
The command storm-control broadcast level 75 65 is configured under the switch port connected to the corporate mail server. In which three ways does this command impact the traffic? (Choose three)
-The switch resumes forwarding broadcasts when they are below 65% of bandwidth. -Only broadcast traffic is limited by this particular storm control configuration. -The switch drops broadcasts when they reach 75% of bandwidth.
While troubleshooting a network outage, a network engineer discovered an unusually high level of broadcast traffic coming from one of the switch interfaces. Which option decreases consumption of bandwidth used by broadcast traffic?
storm control
Which switch feature prevents traffic on a LAN from being overwhelmed by continuous multicast or broadcast traffic?
storm control
Which command would a network engineer apply to error-disable a switchport when a packet-storm is detected?
router(config-if)#storm-control action shutdown
When are frames finally forwarded in *Storm Control* if there was a threshold violation?
Frames are not forwarded until an ENTIRE timeslot is beneath the “Falling Threshold” in Storm Control.
What configuration command enables storm-control?
Sw1(config-if)# storm-control broadcast level 75.5 (percentage)
Sw1(config-if)# storm-control multicast level pps 2k 1k (rising and falling)
Sw1(config-if)# storm-control action shutdown (error-disable)
