JN0-102 · Question #315
Referring to the exhibit, which type of classifier is being used in this CoS configuration? [edit firewall family inet filter COS-CLASSIFIER] user@router# show term MANAGER { from { source-address {…
The correct answer is C. multifield. The CoS classifier COS-CLASSIFIER is configured to match traffic based on both source and destination IP addresses, which is characteristic of a multifield classifier.
Question
Referring to the exhibit, which type of classifier is being used in this CoS configuration? [edit firewall family inet filter COS-CLASSIFIER] user@router# show term MANAGER { from { source-address { 192.168.200.0/25; } destination-address { 100.100.100.1/32; } } then { forwarding-class expedited-forwarding; accept; } } term ALL-OTHER-TRAFFIC { then accept; } [edit interfaces ge-0/0/1] user@router# show unit 0 { family inet { filter { input COS-CLASSIFIER; } address 192.168.200.1/24; } }
Options
- Abehavior aggregate
- Bpolicer
- Cmultifield
- Dforwarding policy
How the community answered
(19 responses)- A11% (2)
- B5% (1)
- C79% (15)
- D5% (1)
Why each option
The CoS classifier `COS-CLASSIFIER` is configured to match traffic based on both source and destination IP addresses, which is characteristic of a multifield classifier.
A behavior aggregate (BA) classifier typically inspects a single field like DSCP or IP precedence to classify traffic, which is not what this filter is doing by using source and destination addresses.
A policer is used for rate limiting traffic, not for classifying it based on header fields like source and destination IP addresses.
A multifield classifier examines multiple fields within a packet's header, such as source IP address (`source-address`) and destination IP address (`destination-address`) in this example, to determine the forwarding class or other CoS attributes. This is in contrast to behavior aggregate classifiers, which look at a single field.
Forwarding policy usually refers to routing policies that influence how routes are selected or advertised, not a CoS mechanism for classifying packets based on header fields.
Concept tested: Class of Service - Multifield Classifier
Source: https://www.juniper.net/documentation/us/en/software/junos/cos/topics/concept/cos-classifiers-overview.html
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