[2018-3-30] Lead2pass 2018 New 642-887 Exam PDF Ensure 642-887 Certification Exam Pass 100% (161-169)

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QUESTION 161
Which configuration set enables outbound label filtering so that only peer 192.168.10.1 receives label advertisements in an MPLS environment? » Read more

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QUESTION 151
Which two options are true regarding the Pipe and Short Pipe MPLS tunneling models? (Choose two.)

A.    In Short Pipe mode QoS is done on the PE-to-CE link based on the customer’s PHB markings
B.    In Pipe mode QoS is done on the PE-to-CE link based on the service provider’s PHB markings
C.    In Pipe mode QoS is done on the PE-to-CE link based on the customer’s PHB markings
D.    In Short Pipe mode QoS is done on the PE-to-CE link based on the service provider’s PHB markings
E.    Short Pipe mode does not need MPLS usage, but Pipe mode does

» Read more

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QUESTION 138
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?

1381

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

Answer: B

QUESTION 139
An engineer looks at packet captures and sees that the MPLS header field of a packet indicates a bottom of stack field of 0. What can the engineer conclude from this information?

A.    The packet is an AToM packet
B.    One label is on the packet
C.    At least one more MPLS label is on the packet
D.    No labels are on the packet

Answer: C

QUESTION 140
Which option is the correct definition of the LB on a Cisco router?

A.    a table used by switching functions to forward labeled packets
B.    a table that holds the next hop for destination prefixes
C.    a label-based adjacency table
D.    a table that stores remote and local label bindings

Answer: A

QUESTION 141
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

QUESTION 142
An engineer is deploying CB-WRED across the entire core network to enforce the previously deployed CBWFQ and decides to change the WRED default to make it work with DSCP. Which policy-map command enables this new profile on regular Cisco IOS routers?

A.    random-detect
B.    random-detect dscp value
C.    random-detect dscp based
D.    random-detect precedence value

Answer: C

QUESTION 143
Which two protocols facilitate label bindings by neighboring routers? (Choose two.)

A.    IS-IS
B.    LDP
C.    OSPF
D.    EIGRP
E.    BGP

Answer: BE

QUESTION 144
Refer to the exhibit. A network engineer who is working for an ISP wants to override the QoS that comes from the customer. The engineer wants to set a QoS value of 5 for all traffic.
What are two reasons why the configuration is not working? (Choose two.)

1441

A.    The service-policy command should point to the service policy, not to the class map
B.    The set command should reference CoS instead of MPLS EXP bits
C.    The service-policy configuration should be set as output
D.    The policy-map configuration needs to reference class-map Custom1
E.    The number 350 in the xconnect command should appear after the encapsulation type

Answer: AD

QUESTION 145
Which two values are class-selector DSCP values? (Choose two.)

A.    001001
B.    000111
C.    111000
D.    100000
E.    000001

Answer: CD

QUESTION 146
Which IOS XR Software feature supports establishing point-to-point and point-to-multipoint TE tunnels traversing multiple IGP areas and levels allowing headend and tailend routers to reside in different areas?

A.    loose hop reoptimization
B.    FRR mode protection
C.    interarea support
D.    loose hop expansion

Answer: B

QUESTION 147
Which option describes the IPv6 flow label field?

A.    a 3-bit field used for marking a traffic flow
B.    an 8-bit field used for labeling a traffic flow
C.    a 20-bit field used to tag a traffic flow throughout the network
D.    an 8-bit field out of which the first 6 are used to classify packets

Answer: C

QUESTION 148
What is a crucial LDP default operating behavior?

A.    LDP uses the solicited mode by default. An LDP label request is sent to the FIB next hop LSR. When the egress router receives the request, it returns message with all the label-mapping information for the LSP is generated.
B.    LDP establishes a TCP session between the PE routers, thus providing label mapping for the LSP
C.    LDP uses downstream unsolicited mode by default. An LSR advertises label mappings to peers without being asked
D.    LDP uses UDP-confirmed messages to establish sessions between PE ingress and egress routers. The UDP messages encode the label information for each LSP and sub-LSP link

Answer: C

QUESTION 149
Which statement defines how MPLS LDT Graceful Restart works after a service interruption?

A.    It works independent of neighboring routers to recover MPLS forwarding information
B.    It works by helping all neighboring MPLS LDP routers to recover MPLS forwarding information
C.    It works by helping neighboring routers with MPLS LDP SSO/NSF and Graceful Restart to recover MPLS forwarding information
D.    It works independent of neighboring non-LDP Graceful Restart routers to recover MPLS forwarding
information

Answer: C

QUESTION 150
Which two factors must you consider when configuring MPLS EXP? (Choose two.)

A.    MPLS EXP marking is supported in the egress direction
B.    A packet that IP ToS classifies at ingress can be reclassified by MPLS EXP at egress
C.    MPLS EXP marking is supported in the ingress direction
D.    MPLS EXP classification for bridged MPLS packets on EVCs is supported
E.    A packet that MPLS classifies at ingress can be reclassified by IP ToS at egress

Answer: CE

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QUESTION 101
How many labels does an MPLS packet have, with a bottom-of-stack label set to zero?

A.    The packet has no label.
B.    The packet has one label.
C.    The packet may have one or more labels.
D.    The packet has at least two labels.

» Read more

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QUESTION 81
What are the four fields inside the MPLS shim header? (Choose four.)

A.    EXP
B.    TTL
C.    Version
D.    S
E.    Length
F.    Label
G.     Type
H.     FCS

» Read more

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QUESTION 61
Which Cisco IOS XR command should be used to identify if MPLS TE FRR is enabled?

A.    show mpls traffic-eng tunnel <tunnel#>
B.    show mpls frr
C.    show mpls traffic-eng protection
D.    show mpls protection
E.    show mpls fast-reroute

» Read more

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QUESTION 41
When using the tunnel mpls traffic-eng path-option 1 explicit name test command in Cisco MPLS TE tunnel configurations, the test explicit-path configuration will consist of a list of which values?

A.    tunnel endpoint
B.    resource class affinity
C.    MPLS label
D.    IP address

» Read more

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QUESTION 21
Which statement is correct regarding the default MPLS TTL behavior?

A.    When an ingress edge LSR receives an IP packet, it will decrement the IP TTL field by 1; then it will
set the MPLS Label TTL field to 255.
B.    When an ingress edge LSR receives an IP packet, it will decrement the IP TTL field by 1; then it will
copy the decremented IP TTL field into the MPLS Label TTL field.
C.    When an ingress edge LSR receives an IP packet, it will just copy the IP TTL field into the MPLS Label
TTL field.
D.    When an ingress edge LSR receives an IP packet, it will copy the IP TTL field into the MPLS Label
TTL field first; then it will only decrement the MPLS Label TTL field by 1.
E.    When an ingress edge LSR receives an IP packet, it will copy the IP TTL field into the MPLS Label
TTL field first; then it will only decrement the IP TTL field by 1.

» Read more

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QUESTION 1
Which three conditions can occur when metering traffic using a dual token bucket traffic policing QoS mechanism on Cisco routers? (Choose three.)

A.    conform
B.    pass
C.    violate
D.    exceed
E.    burst
F.    matched

» Read more