2014 Latest 100% Pass Guaranteed Cisco 642-785 Dumps (51-60)

QUESTION 51
When the RFC 3270 Short Pipe mode is used, the PHB at the egress router is based on which of these?

A.    The topmost MPLS label EXP value.
B.    The MPLS VPN label EXP value.
C.    The Differentiated Services Field value in the IP packet header.
D.    The packet is re-evaluated, remarked, and the PHB is based on this new marking.

Answer: C

QUESTION 52
When the RFC 3270 Uniform mode is used, the PHB at the egress router is based on which of these?

A.    The topmost MPLS label EXP value.
B.    The MPLS VPN label EXP value.
C.    The Differentiated Services field value in the IP packet header.
D.    The packet is re-evaluated, remarked, and the PHB is based on this new marking.

Answer: A

QUESTION 53
A customer reports that during peak hours, FTP performance is unacceptable. Currently, the service provider maps the customer FTP traffic into the class-default traffic class and FTP traffic is marked with MPLS EXP1. The class-default class traffic is configured with MPLS EXP based WRED and also with the bandwidth command. What could be causing the FTP performance issues with the customer?

A.    The FTP-type bulk traffic should be mapped to MPLS EXP 5 instead of MPLS EXP 1. The improper
marking of FTP packets is causing CBWFQ to assign lower priority for FTP packets within the class-default
traffic class.
B.    The service provider is using LLQ on all the core links, but the FTP traffic is not is assigned to the
priority queue.
C.    The bandwidth command is causing the FTP issues. It is generally not recommended to use CBWFQ f
or the class-default traffic class.
D.    FTP packets are being more randomly dropped that the other TCP traffic within the class- default traffic
class, because the WRED thresholds for MPLS EXP 3 marked packets were configured to improper values.

Answer: D

QUESTION 54
Within a QoS policy-map configuration, one of the traffic classes is configured with the random- detect dscp-based configuration command. What will that command accomplish?

A.    provides congestion management by queueing the traffic using CBWFQ
B.    provides congestion management by queueing the traffic using LLQ
C.    decreases the probability of congestion by selectively dropping TCP packets before the queue is full
D.    provides congestion avoidance by selectively delaying the delivery of packets with lower DSCP priority
E.    decreases congestion by avoiding global UDP synchronization

Answer: C

QUESTION 55
What are three benefits of IntServ and RSVP? (Choose three.)

A.    RSVP helps network devices identify dynamic port numbers.
B.    IntServ networks will reject or downgrade new RSVP sessions if all reservable bandwidth is booked
somewhere in a path.
C.    RSVP signaling is a scalable way to ensure all devices maintain an accurate picture of the network state.
D.    They enable the network to guarantee necessary QoS to individual data flows.
E.    The IntServ class-based approach is easy to design and implement.

Answer: ABD

QUESTION 56
Which statement about the rates and statistics (such as match, transmit, drop, and police) shown in the show policy-map interface output is true?

A.    The rates are computed as a moving average of instantaneous rates.
B.    The rates are displayed in real time, which matches the actual traffic rate.
C.    The matched statistics of the packet can be cleared only when the router reboots.
D.    The matched statistics of the packet are displayed in real time.
E.    The traffic policing statistics are displayed in real time.

Answer: A

QUESTION 57
Which four factors can be used for packet classification in a QoS-aware network device? (Choose four.)

A.    source address
B.    destination address
C.    DSCP
D.    TTL
E.    MQC
F.    IP precedence

Answer: ABCF

QUESTION 58
What are the three primary types of faults associated with QoS fault management? (Choose three.)

A.    classification faults
B.    buffer faults
C.    queue faults
D.    marking faults
E.    assurance faults
F.    physical faults

Answer: ADE

QUESTION 59
Which are the two locations where the SP network device always trusts the QoS markings from its upstream neighbor? (Choose two.)

A.    at the ingress PE
B.    at the egress PE
C.    in the SP core
D.    at the ingress CE
E.    at the egress CE

Answer: BC

QUESTION 60
Which of these correctly describes traffic classification using qos-group?

A.    qos-group marking is automatically mapped to MPLS EXP marking.
B.    qos-group is only applicable to an MPLS-enabled router.
C.    qos-group marking value ranges from 0 to 7.
D.    qos-group is local to the router.

Answer: D

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