Compare and Contrast Differentiated Services Code Points (DSCP) and 802.1p (CoS) POWERSWITCH-CAMPUS-DEPLOY Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   What is the role of 802.1p priority tagging in an Ethernet network?

   • AIt encrypts the Ethernet frame to prevent unauthorized access.
   • BIt replaces the source MAC address with a priority value.
   • CIt assigns a 6-bit value to frames to match DSCP markings.
   • DIt assigns a 3-bit priority value to frames to support Class of Service (CoS) at Layer 2.
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   What is the primary purpose of DSCP marking in an IP network?

   • ATo encrypt the payload of IP packets for secure transmission.
   • BTo identify the source and destination MAC addresses of a frame.
   • CTo signal how packets should be treated by network devices in terms of queuing and dropping.
   • DTo replace the TTL field to prevent packets from looping indefinitely.
   Reveal Solution Discussion Select an answer first
4. 8application · medium

   A network administrator is troubleshooting voice quality issues on a Dell PowerSwitch campus network. The IP phones are marking voice traffic with DSCP EF, but the switches are configured to trust only 802.1p priorities. The administrator notices that the voice traffic is being treated as best-effort. What is the most likely reason for this issue?

   • AThe IP phones are not sending 802.1Q tags, so the switches cannot see the DSCP value.
   • BThe switches are not examining the DSCP field in the IP header because they are configured to trust CoS only.
   • CThe switches are remarking DSCP EF to a lower value because the default trust state is DSCP.
   • DThe voice VLAN is not configured on the switch ports, causing the DSCP marking to be stripped.
   Reveal Solution Discussion Select an answer first
5. 9foundation · easy

   Which statement accurately describes the relationship between DSCP and 802.1p mappings?

   • AThere is a one-to-one correspondence between every DSCP value and every 802.1p priority.
   • B802.1p priorities are mapped to DSCP values only in wireless networks.
   • CMultiple DSCP values are typically mapped to a single 802.1p priority.
   • DDSCP and 802.1p are independent and never mapped to each other.
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   What does it mean when a switch is configured to 'trust' DSCP markings on ingress?

   • AThe switch uses the DSCP value in the packet to determine its QoS treatment.
   • BThe switch only trusts DSCP values that match its own configuration.
   • CThe switch ignores the DSCP value and re-marks all packets with a default value.
   • DThe switch replaces the DSCP value with the 802.1p priority.
   Reveal Solution Discussion Select an answer first