CoS Configuration for JN0-102 Exam: Juniper Networks Certified Associate Junos

Which Type of Classifier is Used in This CoS Configuration?

Prev Question Next Question

Question

-- Exhibit --

[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 {

familyinet {

filter {

input COS-CLASSIFIER;

}

address 192.168.200.1/24;

}

}

-- Exhibit --

Referring to the exhibit, which type of classifier is being used in this CoS configuration?

Answers

Explanations

Click on the arrows to vote for the correct answer

A. B. C. D.

C

In the exhibit, the configuration is defining a firewall filter named COS-CLASSIFIER, which is then applied as an input filter on interface ge-0/0/1 unit 0. The filter is used to classify traffic based on its source and destination addresses and assign a forwarding class to it.

Specifically, there are two terms in the filter:

  • MANAGER: This term matches traffic with a source address in the 192.168.200.0/25 network and a destination address of 100.100.100.1/32. When this traffic is matched, the forwarding class "expedited-forwarding" is assigned to it, and the traffic is accepted (i.e., allowed to proceed).
  • ALL-OTHER-TRAFFIC: This term simply accepts all other traffic that is not matched by the previous term.

Based on this configuration, the type of classifier being used is a multifield classifier. This is because the filter is matching traffic based on multiple fields (source and destination addresses) before assigning a forwarding class. In contrast, a behavior aggregate classifier would classify traffic based on a single field, such as protocol or port number, and a policer would limit the rate or volume of traffic. Finally, a forwarding policy is used to determine how traffic is forwarded through the network, but it is not used for classification.