Compare and Contrast Differentiated Services Code Points (DSCP) and 802.1p (CoS) POWERSWITCH-CAMPUS-DEPLOY Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   What is the purpose of mapping DSCP values to 802.1p priorities on a switch?

   • ATo replace the VLAN ID with a priority value.
   • BTo translate Layer 3 QoS markings into Layer 2 priority tags for use within the switch's queuing system.
   • CTo encrypt the DSCP field for secure transmission.
   • DTo convert DSCP values into IP addresses for routing decisions.
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   In an 802.1Q tagged Ethernet frame, where is the 802.1p priority information located?

   • AIn the payload of the frame, after the data.
   • BIn the Ethernet Type field, replacing the EtherType value.
   • CIn the IP header, replacing the DSCP field.
   • DIn the 3-bit Priority Code Point (PCP) field of the VLAN tag.
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A network engineer is designing QoS for a campus network that carries both IP traffic and non-IP traffic, such as legacy protocols. The engineer needs a marking mechanism that can prioritize traffic even when the IP header is not present. Which marking mechanism should the engineer use?

   • A802.1p (CoS)
   • BVLAN ID
   • CMPLS EXP
   • DDSCP
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   An administrator wants to ensure that traffic from a trusted VoIP server is prioritized in the campus network. The server marks all packets with DSCP EF. The Dell PowerSwitch access ports are currently configured to trust 802.1p. What should the administrator do to ensure the DSCP marking is honored?

   • AConfigure the access ports to trust both DSCP and 802.1p simultaneously.
   • BEnable 802.1p tagging on the VoIP server.
   • CChange the trust mode on the access ports to trust DSCP.
   • DRemark the DSCP value to a higher value on the access ports.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   An administrator notices that traffic from a video surveillance system is being treated as best-effort even though the cameras are configured to mark traffic with DSCP AF41. The Dell PowerSwitch ports are configured to trust 802.1p. What is the most likely cause?

   • AThe switch is remarking DSCP AF41 to a lower value because of the default trust state.
   • BThe cameras are not sending 802.1Q tags, so the switch cannot read the DSCP value.
   • CThe switch is ignoring the DSCP marking because it is configured to trust CoS only.
   • DThe video surveillance VLAN is not configured correctly, causing the DSCP marking to be dropped.
   Reveal Solution Discussion Select an answer first