Term
| What are the three configuration parameters for Random Early Detection (RED)? |
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Definition
| The three configuration parameters for RED are minimum threshold, maximum threshold, and mark probability denominator. |
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Term
| How does Random Early Detection (RED) use the mark probability denominator (MPD) configuration parameter? |
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Definition
| MPD is an integer that dictates to RED to drop 1 of MPD (as many packets as the value of mark probability denominator), while the size of the queue is between the values of minimum and maximum thresholds. |
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Term
| What are the three modes that Random Early Detection (RED) runs in? |
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Definition
- No-drop - When the queue size is below the minimum threshold value. - Random-drop - When the queue size is between the minimum and maximum thresholds. - Full-drop (tail-drop) - When the queue size rows beyond the maximum threshold value. |
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Term
| How does Weighted Random Early Detection (WRED) differ from Random Early Detection (RED)? |
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Definition
| WRED has the added capability of differentiating between high- and low-priority traffic. With WRED, you can set up a different profile for each traffic priority. When a packet arrives, first based on its IP presedence or DSCP value, its profile is recognized. |
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Term
| Describe the use of Class-Based Weighted Random Early Detection (CBWRED). |
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Definition
| Applying WRED inside a CBWFQ system yields CBWRED. Within each queue, packet profiles are based on IP presedence or DSCP value. |
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Term
| What command enables Weighted Random Early Detection (WRED) on an interface? |
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Definition
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Term
| How many profiles exist by default when Weighted Random Early Detecion (WRED) is enabled? |
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Definition
| By default, WRED is based on IP presedence, therefore, either profiles exist, one for each IP precedence value. If WRED is DSCP based, there are 64 possible profiles. |
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Term
| How is non-IP traffic treated on an interface with Weighted Random Early Detection (WRED) enabled? |
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Definition
| Non-IP traffic is treated equivalent to IP traffic with IP presedence equal to 0. |
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Term
| How do you configure Weighted Random Early Detection (WRED) on a CBWFQ system? |
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Definition
| To perform CBWRED, you must enter the random-detect command for each class within the policy map |
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Term
| What command enabled DSCP-based Weighted Random Early Detection (WRED) on a policy map? |
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Definition
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Term
| What command configured the thresholds and mark-probability denominator for each DSCP value? |
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Definition
random-detect dscp dscp-value min-threshold max-threshold mark-prob-denominator
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Term
| What command configures the thresholds and mark-probability denominator for each IP presedence value within a policy map? |
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Definition
| random-detect presedence presedence-value min-threshold max-threshold mark-prop-denominator |
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Term
| How do you simultaneously apply Weighted Random Early Detection (WRED) and WFQ to a class policy? |
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Definition
| You can not apply WRED and WFQ to the same class policy. You also cannot apply WRED and PQ, CQ, or WFQ to an interface. |
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Term
| What are the main purposed for traffic policing? |
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Definition
- To limit the traffic rate to a value less than the physical access rate. - To limit the traffic rate for each traffic class - To re-mark traffic |
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Term
| What are the main purposed for traffic shaping? |
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Definition
- To slow down the rate of traffic being sent to another site through a WAN service such as Frame Relay or ATM. - To comply with the subscribed rate - To send different traffic classes at different rates |
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Term
| In which direction is traffic shaping and traffic policing applied on an interface? |
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Definition
| Policing can be applied to the inbound and outbound traffic, but traffic shaping applies only to outbound traffic |
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