6.3 Describe QoS Trust Boundaries and Their Significance in LAN-based Classification and Marking 350-801 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   What is the primary purpose of marking traffic with DSCP at the trust boundary on a LAN switch?

   • ATo route the traffic to the correct destination
   • BTo encrypt the traffic for security
   • CTo compress the traffic for efficiency
   • DTo identify the traffic class for QoS treatment
   Reveal Solution Discussion Select an answer first
2. 2expert · medium

   A network engineer is designing QoS for a campus network that includes IP phones and PCs on the same access ports. The requirement is to ensure that voice traffic is prioritized, but also to prevent the PCs from influencing QoS markings. The engineer is considering using the 'trust device cisco-phone' feature. What is the primary benefit of this feature in this scenario?

   • AIt enables the switch to mark all traffic from the port with a default CoS value.
   • BIt allows the switch to trust CoS markings from the IP phone while treating traffic from the PC as untrusted.
   • CIt allows the PC to use the phone's CoS markings for its own traffic.
   • DIt automatically configures the port to trust DSCP markings from all devices.
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   Why is it important to establish a QoS trust boundary in a network?

   • ATo allow all devices to set their own QoS markings without restriction
   • BTo increase the speed of the network by reducing the number of packets
   • CTo ensure consistent QoS enforcement and prevent untrusted devices from altering markings
   • DTo eliminate the need for QoS policies on the network
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   Which switch configuration command is used to set a port as a QoS trust boundary?

   • Aspanning-tree portfast
   • Bip address dhcp
   • Cmls qos trust cos
   • Dswitchport mode access
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A company is deploying a new VoIP system. The network team wants to ensure that voice traffic is prioritized across the LAN. They are considering where to place the trust boundary. Which statement best describes the significance of placing the trust boundary at the access layer?

   • AIt ensures that all traffic is classified and marked at the edge of the network, providing consistent QoS enforcement.
   • BIt allows end devices to set their own markings, which is more efficient.
   • CIt reduces the need for QoS policies on the core switches.
   • DIt eliminates the need for trust boundaries on other switches.
   Reveal Solution Discussion Select an answer first