NEW QUESTION 1
On the Cisco IOS XR, which MQC configuration is different than on the Cisco IOS and IOS XE?

• A. On the Cisco IOS XR, WRED can only be applied in the output direction.
• B. On the Cisco IOS XR, marking can only be applied in the input direction.
• C. On the Cisco IOS XR, LLQ can be applied in the input or output direction.
• D. On the Cisco IOS XR, LLQ can use up to four priority queues: level 1, level 2, level 3, and level 4.

Answer: C

NEW QUESTION 2
Which affinity value will be matched by the affinity bit mask of the affinity 0xFF00000A mask 0xFFFF000F command?

• A. 0xFFFF000A
• B. 0xFF00EEEA
• C. 0xFF000000
• D. 0x00000000
• E. 0x11110001

Answer: B

Explanation: 0xFF00000A 11111111000000000000000000001010
0xFFFF000F 11111111111111110000000000001111
0xFF00EEEA 11111111000000001110111011101010

NEW QUESTION 3
Which queuing mechanism should an engineer implement on delay sensitive categories of traffic?

• A. weighted fair
• B. priority
• C. low-latency
• D. weighted round-robin

Answer: C

NEW QUESTION 4
Which four pieces of information are stored for each prefix in the LFIB? (Choose four.)

• A. local label
• B. outgoing label
• C. next-hop IP address
• D. outgoing interface
• E. incoming interface
• F. Layer 2 header rewrite information

Answer: ABCD

Explanation: Forwarding Labeled Packets
LSR forwards the packet based on: Top Label value of the received packet
Corresponding entry in LFIB (LABEL <=> INTERFACE)
#show mpls forwarding-table - will show: local label
outgoing label prefix (network) outgoing interface next-hop

LSR expects packet to come with "top" label being "Local" (from show mpls forwarding- table).
If Outgoing label is "Aggregate", then that means that this is a summary route and more specific lookup is performed.
If LSR cannot find label/interface mapping in LFIB, then it drops the packet. There are several "RESERVED" labels numbered from 0 to 15:
0 - explicit NULL - is used to preserver QoS info through EXP bits. It copies 'ip prec' or DiffServ.
1 - Router alert label - forces LSR to software switch the packet.
3 - Implicit NULL - this label is used for "connected" or "summary" routes. This way LSR signals its neighbors to execute "POP label" operation on "connected" routes. It is called PHP, Penultimate Hop Popping, and is used to make sure that LSR does not perform 2 lookups (label + ip).
14 - OEM alert label - is used for monitoring purpose.
In Cisco IOS, the default range is 16 through 100,000, but can be expanded by using "mpls label range" command.

NEW QUESTION 5
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

NEW QUESTION 6
An engineer is allocating a determined amount of bandwidth to a customer Cisco MPLS TE tunnel to guarantee its availability on a 24/7 SLA type. Which option must be configured to make sure the customer is able to use the bandwidth agreed on the SLA?

• A. RSVP that guarantees bandwidth availability end-to-end
• B. Cisco MPLS TE tunnel to signal the bandwidth required
• C. a QoS policy to reinforce the RSVP bandwidth reservation
• D. overprovisioning to guarantee bandwidth

Answer: C

NEW QUESTION 7
A company asks an engineer to provide an explanation for implementing MPLS DiffServ- TE services. Which option is a DiffServ-TE fundamental concept that should be highlighted?

• A. expedited forwarding
• B. assured forwarding
• C. class of service
• D. class types
• E. fast reroute

Answer: D

NEW QUESTION 8
Which two values must be specified in a Cisco NBAR configuration? (Choose two.)

• A. port number
• B. IP precedence
• C. neighbor discovery address
• D. CoS
• E. transport protocol

Answer: AE

NEW QUESTION 9
Which option describes what happens when a labelled packet with a TTL of 1 is received by an LSR?

• A. The packet is forwarded on to the next router where its TTL expires and from where an ICMP "time exceeded" message is generated and routed back to the source.
• B. The packet is dropped and an ICMP "time exceeded" message is IP routed back to the sender.
• C. The packet is dropped and an ICMP "time exceeded" message is label-switched from the expiring router back on a new path toward the source.
• D. The packet is dropped and an ICMP "time exceeded" message is label-switched from the expiring router on the same label switched path toward the destination and then back to the originating source.
• E. The packet is forwarded on to the next router where its TTL expires and from where an ICMP "time exceeded" message is generated and label switched back to the source.

Answer: D

NEW QUESTION 10
Referring to the traceroute output exhibit that is shown,

which statement is correct?

• A. There is no problem with the end-to-end LSP as indicated by the successful trace.
• B. Normal PHP operation is performed by the hop 4 router.
• C. The end-to-end LSP is broken at hop 4.
• D. At each hop, each LSR is able to perform label swapping.

Answer: C

NEW QUESTION 11
When implementing MPLS DS-TE on Cisco IOS XR routers, all aggregate Cisco MPLS TE traffic is mapped to which class type by default?

• A. class-type 0 (bandwidth global pool)
• B. class-type 1 (bandwidth subpool)
• C. class-type 2 (bandwidth priority)
• D. class type class-default (bandwidth best-effort)

Answer: A

Explanation: Differentiated Services Traffic Engineering
MPLS Differentiated Services (Diff-Serv) Aware Traffic Engineering (DS-TE) is an extension of the regular
MPLS-TE feature. Regular traffic engineering does not provide bandwidth guarantees to different traffic classes. A single bandwidth constraint is used in regular TE that is shared by all traffic. To support various classes of service (CoS), users can configure multiple bandwidth constraints. These bandwidth constraints can be treated differently based on the requirement for the traffic class using that constraint.
MPLS diff-serv traffic engineering provides the ability to configure multiple bandwidth constraints on an MPLSenabled interface. Available bandwidths from all configured bandwidth constraints are advertised using IGP.
TE tunnel is configured with bandwidth value and class-type requirements. Path calculation and admission control take the bandwidth and class-type into consideration. RSVP is used to signal the TE tunnel with bandwidth and class-type requirements.
Diff-Serv TE can be deployed with either Russian Doll Model (RDM) or Maximum Allocation Model (MAM) for bandwidth calculations.

NEW QUESTION 12
What is an important requirement with MPLS applications like Layer 3 MPLS VPNs?

• A. All the PE routers loopback addresses should be summarized to reduce the number of routing table entries in the core routers.
• B. Targeted hellos are required between all the PE routers.
• C. An end-to-end LSP is required between the PE routers.
• D. The LSPs that are built between the PE routers must be symmetrical (bidirectional).

Answer: C

NEW QUESTION 13
Refer to the exhibit. Based on the raw format of an MPLS header captured by a traffic analyzer, what is the value of the MPLS EXP field?

• A. 1
• B. 255
• C. 5
• D. 29

Answer: C

NEW QUESTION 14
On Cisco routers, which three methods can be used to map traffic into the MPLS traffic engineering tunnel? (Choose three.)

• A. on-demand routing
• B. static routing
• C. optimized edge routing
• D. policy-based routing
• E. autoroute

Answer: BDE

NEW QUESTION 15
Refer to the exhibit.

IT administrators report packet loss on the critical applications coming with CoS 4. Which option is the appropriate configuration to have a lower drop probability when the packets are processed using
DSCP values?

• A. set ip dscp af22
• B. set ip dscp af41
• C. set ip dscp af13
• D. set ip dscp af32

Answer: B

NEW QUESTION 16
Cisco MPLS TE path setup can be affected by which three tunnel attributes? (Choose three.)

• A. bandwidth
• B. delay
• C. MTU
• D. priority
• E. affinity

Answer: ADE

NEW QUESTION 17
Refer to the exhibit.

This WRED policy configuration is implemented on an IOS XR router. What is the measurement of the numbers in the random-detect precedence command?

• A. bytes
• B. number of packets
• C. kilobytes
• D. milliseconds

Answer: B

NEW QUESTION 18
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