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Q1. Which item is not available to be used for QoS classification in Cisco IOS XR?

A. MAC SA

B. protocol

C. inner EXP

D. discard-class

E. QoS-group

F. VLAN

Answer: C

Q2. When implementing Cisco MPLS TE, the constrained-based path calculations will use which value as the TE cost of each link within the MPLS domain?

A. By default, it will use the IGP metric, or each link can be assigned a specific value using the admin-weight command.

B. It can only use the IGP metric as the TE cost.

C. It will use the interface bandwidth as the TE cost.

D. Each link must be assigned a TE cost using the metric command.

Answer: A

Q3. Which three statements are correct regarding ping mpls command operations? (Choose three.)

A. MPLS OAM has to be enabled on the router using the mpls oam command.

B. They use a 127/8 address as the destination address in the MPLS echo request packet.

C. They use ICMP echo request and ICMP echo reply packets.

D. They are used to test for a broken LSP.

E. If there is a broken LSP, instead of using label switching, the packet can still be forwarded based on the destination IP address in the mpls ping echo request packet.

Answer: ABD

Q4. Which three network services can be implemented using MPLS within the service provider IP NGN core? (Choose three.)

A. Layer 2 VPNs

B. Layer 3 VPNs

C. traffic engineering

D. IntServ traffic engineering tunnels

E. encrypted LSPs

Answer: ABC

Q5. Which field in the MPLS shim header is used to support different QoS markings?

A. IP precedence

B. DSCP

C. EXP

D. ToS

E. S

F. Label

Answer: C

Q6. Which Cisco IOS XR command should be used in order to enable LDP on all interfaces for which the IGP protocol is enabled?

A. RP/0/0/CPU0:R1(config-ospf)#mpls ldp auto-config

B. RP/0/0/CPU0:R1(config-ospf)#mpls ldp interface all enable

C. RP/0/0/CPU0:R1(config-ospf)#enable all

D. RP/0/0/CPU0:R1(config-ldp)#enable all

Answer: A

Q7. Referring to the show output exhibit, which statement is correct?

A. The P1 router is receiving label information for the 10.0.2.1/32 prefix from two LDP peers.

B. The P1 router is receiving label information for the 10.7.1.1/32 prefix from two LDP peers.

C. The P1 router is using the IMP-NULL local label for the 10.7.1.1/32 prefix because 10.7.1.1/32 is the loopback interface IP address on the P1 router.

D. The P1 router will perform PHP for the 10.7.1.1/32 and 10.7.10.1./32 prefixes.

Answer: B

Q8. When a link flaps, an mpls ldp session will also flap. Which feature minimizes traffic loss and provides faster convergence after the link is re-established?

A. BFD

B. MPLS LDP IGP SYNC

C. graceful restart

D. LDP session protection

E. LDP nonstop routing

Answer: D

Q9. With unmanaged CE routers, at which point in the service provider network is the QoS trust boundary, and what is required at the trust boundary?

A. between the CE and PE router and mapping of the customer traffic classes into the service provider traffic classes at the PE router ingress

B. between the CE and PE router and trusting the QoS markings from the CE router and applying the required QoS mechanisms based on the customer QoS markings

C. between the PE and the P router and mapping of the customer traffic classes into the

service provider traffic classes at the P router ingress

D. between the PE and P router and trusting the QoS markings from the CE router and applying the required QoS mechanisms based on the customer QoS markings

E. between the customer network and the CE router ingress and applying the required egress QoS policy on the CE router

Answer: A

Q10. Which are typical class-based marking policies that are implemented on service provider IP NGN PE routers?

A. On the PE ingress, classify the customer traffic and then mark with qos-group. On the PE egress, classify based on the qos-group and then mark with mpls exp.

B. On the PE ingress, classify the customer traffic and then mark with mpls exp. On the PE egress, classify based on the mpls exp and then mark with qos-group.

C. On the PE ingress, trust the customer QoS markings. On the PE egress, classify based on the customer QoS markings and then mark with qos-group.

D. On the PE ingress, trust the customer QoS markings. On the PE egress, classify based on the customer QoS markings and then mark with mpls exp.

Answer: A