QoS Marking: Locally Significant on Cisco Router
Question
Which QoS marking is only locally significant on a Cisco router?
Answers
Explanations
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A. B. C. D. E. F.C.
The QoS (Quality of Service) marking on a Cisco router is used to prioritize and manage network traffic. Different types of QoS markings are used to indicate the priority of network traffic, which helps the router to make decisions on how to handle that traffic.
Of the QoS markings listed in the question, the only one that is locally significant on a Cisco router is IP precedence (option D).
IP precedence is a 3-bit field within the IP packet header that is used to indicate the priority of the packet. The values range from 0 to 7, where 0 is the lowest priority and 7 is the highest. This field is used by routers to prioritize traffic, but it is only locally significant, which means that it is not typically carried across the network. This means that the IP precedence value set on a packet by a router will only be used by that router and will not be recognized by other routers in the network.
In contrast, the other QoS markings listed in the question are globally significant, which means that they are recognized and used by all routers in the network. For example, DSCP (option B) is a QoS marking that is used to indicate the priority of traffic in IP networks. It is a globally recognized standard that is used by all routers in the network to prioritize traffic. Similarly, MPLS EXP (option A) is a QoS marking that is used to indicate the priority of traffic in MPLS networks. It is also globally recognized and used by all routers in the network.
QoS group (option C), traffic class (option E), and flow label (option F) are also QoS markings that are used to prioritize traffic. However, they are not used in the same way as IP precedence, DSCP, and MPLS EXP, and are not locally significant on a Cisco router. Instead, they are used to group traffic into different classes or flows and provide more granular control over how traffic is prioritized and managed in the network.
In summary, of the QoS markings listed in the question, only IP precedence is locally significant on a Cisco router. The other QoS markings are globally significant and are recognized and used by all routers in the network.
