— 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 {
family inet {
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?
A.
behavior aggregate
B.
policer
C.
multifield
D.
forwarding policy
Explanation:
https://www.juniper.net/techpubs/software/junos-es/junos-es93/junos-es-swconfig-interfaces-and-routing/classifiers.html
Packet classification refers to the examination of an incoming packet. This function associates the packet with a particular CoS servicing level. Two general types of classifiers are supported—behavior aggregate (BA) classifiers and multifield (MF) classifiers. When both BA and and MF classifications are performed on a packet, the MF classification has higher precedence.
see more in the link
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multifield (MF) classifier is a second method for classifying traffic flows. Unlike the behavior aggregate classifier, a multifield classifier can examine multiple fields in the packet—for example, the source and destination address of the packet or the source and destination port numbers of the packet. With multifield classifiers, you set the forwarding class and loss priority of a packet based on firewall filter rules.
Note: For a specified interface, you can configure both an MF classifier and a BA classifier without conflicts. Because the classifiers are always applied in sequential order, the BA classifier followed by the MF classifier, any BA classification result is overridden by an MF classifier, if they conflict.
JUNOS software performs MF traffic classification by directly scrutinizing multiple fields of a packet to classify a packet without having to rely upon the output of the previous BA traffic classification. JUNOS software can simultaneously check a packet’s data ranging from layer 2 to layer 7 as shown in Table 176
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