1.4 Describe QoS Architecture 350-501 Practice Questions (Page 7)

Questions 31–35

1. 31application · medium

   A service provider is designing a QoS architecture for a new IP/MPLS network. The provider wants to classify and mark traffic at the edge of the network and apply per-hop behaviors (PHBs) in the core. The provider also wants to use the IPv6 flow label field to assist with classification and load balancing. Which QoS model should the provider implement?

   • AShort Pipe model
   • BIntegrated Services (IntServ)
   • CDifferentiated Services (DiffServ)
   • DUniform model
   Reveal Solution Discussion Select an answer first
2. 32foundation · easy

   In the MPLS QoS Uniform model, how are QoS markings treated as packets traverse the MPLS network?

   • AThe customer's markings are preserved end-to-end and the provider's markings are used only internally.
   • BThe markings are propagated and potentially modified across the entire MPLS network, including the customer edge.
   • CThe provider's markings are used only on the backbone and the customer's markings are exposed at the egress.
   • DThe markings are stripped at the ingress and re-marked at the egress based on the provider's policy.
   Reveal Solution Discussion Select an answer first
4. 33application · medium

   A service provider is offering a premium service to a customer that requires end-to-end QoS guarantees for a critical application. The provider needs to reserve bandwidth along the entire path from the customer's site to the remote site, using RSVP. Which QoS model should be used?

   • AIntegrated Services (IntServ)
   • BDifferentiated Services (DiffServ)
   • CUniform model
   • DShort Pipe model
   Reveal Solution Discussion Select an answer first
5. 34application · medium

   A service provider is designing QoS for its core network. The provider wants to classify and mark traffic at the edge, then apply per-hop behaviors (PHBs) in the core based on the markings. Which QoS model should be used?

   • APipe model
   • BDiffServ model
   • CIntServ model
   • DUniform model
   Reveal Solution Discussion Select an answer first
6. 35expert · hard

   A service provider has two MPLS TE tunnels between two PEs: Tunnel A is optimized for low latency, and Tunnel B is optimized for high bandwidth. The provider wants voice traffic (DSCP EF) to use Tunnel A and bulk data traffic (DSCP AF11) to use Tunnel B. The provider also wants to use policy rules that can consider source and destination IP addresses in addition to DSCP. Which mechanism should be used?

   • AClass-Based Tunnel Selection (CBTS)
   • BRussian Doll Model (RDM)
   • CMaximum Allocation Model (MAM)
   • DPolicy-Based Tunnel Selection (PBTS)
   Reveal Solution Discussion Select an answer first