[2018-3-30] Official 642-887 Exam Preparation Download From Lead2pass (138-150)
Lead2pass 642-887 Exam Questions Free Download.v.2018-3-30.190q:
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
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
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
Which two values must be specified in a Cisco NBAR configuration? (Choose two.)
A. port number
B. IP precedence
C. neighbor discovery address
E. transport protocol
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?
B. random-detect dscp value
C. random-detect dscp based
D. random-detect precedence value
Which two protocols facilitate label bindings by neighboring routers? (Choose two.)
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.)
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
Which two values are class-selector DSCP values? (Choose two.)
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
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
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
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
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
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