What is used to perform QoS packet classification?
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A. B. C. D.C.
The correct answer is C. the TOS (Type of Service) field in the Layer 3 header is used to perform QoS (Quality of Service) packet classification.
QoS is a network technology that allows for the prioritization of network traffic based on its importance or sensitivity. QoS is used to ensure that high-priority traffic (such as voice or video) is given priority over low-priority traffic (such as file downloads) during times of network congestion.
Packet classification is the process of identifying network traffic and assigning it a specific QoS treatment based on its characteristics. The TOS field in the Layer 3 header is used to perform QoS packet classification by providing information about the type of service required by the packet.
The TOS field in the IPv4 header is an 8-bit field that is used to define the type of service provided by the IP layer. This field can be used to classify packets based on their priority, delay sensitivity, throughput requirements, and reliability. The TOS field was later replaced by the DSCP (Differentiated Services Code Point) field in the IPv4 and IPv6 headers, which provides greater flexibility in packet classification.
In summary, the TOS field in the Layer 3 header is used to perform QoS packet classification by providing information about the type of service required by the packet.