What is set when using CoS to mark an Ethernet frame?
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A. B. C. D.D.
When using Class of Service (CoS) to mark an Ethernet frame, the 802.1p User Priority bits are set.
CoS is a mechanism used in computer networks to prioritize network traffic based on the type of data being transmitted. It allows different types of traffic to be classified and prioritized differently to ensure that critical data is transmitted with the highest priority, while less important data is transmitted with lower priority.
The 802.1p User Priority bits are part of the Ethernet header and are used to indicate the priority level of the frame. These bits are defined in the IEEE 802.1Q standard, which is used for virtual LAN (VLAN) tagging.
The 802.1p standard defines eight priority levels (0 to 7), with 7 being the highest priority. When a frame is transmitted, the User Priority bits are set to indicate the priority level of the frame.
For example, a voice over IP (VoIP) call may be assigned a higher priority level than web browsing traffic. The switch can then use the priority level information to prioritize the VoIP traffic over the web browsing traffic, ensuring that the VoIP call quality is maintained even when the network is congested.
In summary, the correct answer is D, the 802.1p User Priority bits are set when using CoS to mark an Ethernet frame.