30 December, 2019

Implementing Cisco Service Provider Next-Generation Core Network Services (SPCORE) 642-887 Lab

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Total 184 questions Full Exam Access

Question 1

An engineer is having a problem getting an operational 10 Gigabit link on a Cisco ASR 9000 series router. The service provider instructs the engineer to use an LR optic. The engineer must access the router remotely.
Which command should the engineer issue to determine that the correct optic has been installed?

show controllers

show module optics

show ip interface

show optics

Question 2

Referring to the traceroute output exhibit that is shown,
642-887 dumps exhibit

which statement is correct?

There is no problem with the end-to-end LSP as indicated by the successful trace.

Normal PHP operation is performed by the hop 4 router.

The end-to-end LSP is broken at hop 4.

At each hop, each LSR is able to perform label swapping.

Question 3

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

001001

000111

111000

100000

000001

Question 4

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

class-type 0 (bandwidth global pool)

class-type 1 (bandwidth subpool)

class-type 2 (bandwidth priority)

class type class-default (bandwidth best-effort)

Question 5

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

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

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

They use ICMP echo request and ICMP echo reply packets.

They are used to test for a broken LSP.

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.

Question 6

Which configuration can a network engineer use to establish high availability for LDP in an MPLS setup?

mpls ldpgraceful-restart graceful-restartgraceful-restart forwarding state-holdtime 180 graceful-restart reconnect-timeout 15 interface HundredGigE0/4/0/0

mpls ldp graceful-restartgraceful-restart forwarding state-holdtime 180 graceful-restart reconnect-timeout 15

mpls ldpsession protection for peer_acl duration 60 ipv4 access-list peer_acl10 permit ip host 192.168.10.1 any

router ospf 1 mpls ldp sync mpls ldpigp sync delay 30

mpls ldprouter-id loopback0 discovery hello holdtime 15 discovery hello interval 5

Question 7

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

MPLS EXP marking is supported in the egress direction

A packet that IP ToS classifies at ingress can be reclassified by MPLS EXP at egress

MPLS EXP marking is supported in the ingress direction

MPLS EXP classification for bridged MPLS packets on EVCs is supported

A packet that MPLS classifies at ingress can be reclassified by IP ToS at egress

Question 8

A network architect recently deployed AToM solutions for large enterprises over a service provider core
network. The architect now asks to deploy QoS over the same VPN to reinforce the SLA for these customers.
Which MPLS label field can be used for this purpose?

discard/eligibility field

type of service

last 8 bits

experimental bits

Question 9

Which Cisco IOS XR high-availability feature is used to prevent routes from being used before LDP converges?

LDP session protection

LDP-IGP synchronization

BFD

IGP session protection

Question 10

Refer to the exhibit.
642-887 dumps exhibit

Which result occurs from this configuration?

The tunnel comes up because of the explicit path configuration and disregards all CSPF calculations

If the explicit path becomes unavailable, the tunnel falls back to dynamic routing paths

If the explicit path becomes unavailable, the tunnel fails

The traffic through the tunnel is limited to 65,000 Kbps of bandwidth

Question 11

The Cisco IOS and IOS XE qos pre-classify command allows which kind of packet classification on IP packets that are encapsulated with GRE and IPsec?

allows for packets to be classified based on the ToS byte values before packet encryption

allows for packets to be classified based on the ToS byte values after packet encryption

allows for packets to be classified based on the packet payload before packet encryption

allows for packets to be classified based on the packet payload after packet encryption

allows for packets to be classified based on the packet header parameters other than the ToS byte values after packet encryption

Question 12

DRAG DROP

Solution:
1) Build RIB
2) Assign labels
3) Advertise Labels 4)Build LFIB
1) Build RIB
2) Assign labels
3) Advertise Labels
4) Build LFIB

Does this meet the goal?

Yes

Question 13

Refer to the exhibit.
642-887 dumps exhibit

Which two commands can be used to assign traffic onto MPLS TE Tunnel1001? (Choose two.)

ip route 0.0.0.0 0.0.0.0 Tunnel1001

tunnel mpls traffic-eng autoroute announce

tunnel mpls traffic-eng bandwidth

tunnel mpls traffic-eng priority 1 1

ip route 0.0.0.0 0.0.0.0 10.0.0.1

Question 14

Which driver uses an IntServ QoS model in an MPLS TE enabled service provider network?

DSCP, which requires signaling across the provider network

RSVP, which enables bandwidth guarantees across a provider network

RSVP, which enables per-hop behavior across a provider network

DSCP, which enables bandwidth guarantees across a provider network

Question 15

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

EXP

TTL

Version

Length

Label

Type

FCS

Question 16

An engineer has been tasked to configure a guaranteed 10 Mbps priority queue for traffic matched by class-map VOICE_CLASS on Cisco IOS XR. Which policy must be applied for outgoing traffic on interface FastEthernet 0/0/1?

configurepolicy-map VOICE_POLICY class VOICE_CLASSpolice rate 10000 exceed-action drop exitpriority level 1 exitexitinterface FastEthernet 0/0/1service-policy output VOICE_POLICY commit

configurepolicy-map VOICE_POLICY class VOICE_CLASS priority percent 10exit exitinterface FastEthernet 0/0/1service-policy output VOICE_POLICY commit

configurepolicy-map VOICE_POLICYclass VOICE_CLASS police rate 1000 exceed-action drop exitpriority level 1 exitexitinterface FastEthernet 0/0/1service-policy output VOICE_POLICY commit

configurepolicy-map VOICE_POLICY class VOICE_CLASSpolice rate 10 Mbps exceed-action shape exitpriority level 1 exitexitinterface FastEthernet 0/0/1service-policy output VOICE_POLICY commit

Question 17

An LDP session is established between two neighbors. Over which protocol and port number do they maintain their adjacency?

TCP 711

UDP 646

UDP 711

TCP 646

Question 18

A network engineer wants to implement QoS in an environment in which GRE tunnels are used. The engineer creates a policy map to classify the traffic and applies the map to the physical interface. Despite a successful ping to the end of the tunnel, the counter of the class-map ICMP does not register a hit. How can the engineer fix this problem?

enable QoS preclassify in the tunnel interface

send the ping with source tunnel 0

send the ping with source F0/0

enable QoS preclassify in the physical interface

Question 19

Which method maps MPLS EXP bit 5 to COS 5 on Cisco IOS XE?

configure terminal class-map match expmatch mpls experimental topmost 5exitpolicy-map EXP2Cos class expset cos 5 exitclass class-default random-detecinterface fastethernet 0/0 service-policy output EXP2Cos

configure terminalclass-map match expmatch mpls experimental topmost 5 exitpolicy-map EXP2Cos class expset cos 5 exitclass class-default random-detecinterface fastethernet 0/0 service-policy input EXP2Cos

configure terminal class-map match exp match mpls cos 5 exitpolicy-map EXP2Cos class expset mpls experimental topmost 5 exitclass class-default random-detecinterface fastethernet 0/0 service-policy output EXP2Cos

configure terminalclass-map match exp match mpls cos 5 exitpolicy-map EXP2Cos class expset mpls experimental topmost 5 exitclass class-default random-detecinterface fastethernet 0/0 service-policy output EXP2Cos exitcommit

configure terminalip access-list 101 permit ip any any mpls experimental 5 class-map match expmatch access-group 101 exitpolicy-map EXP2Cos class expset cos 5 exitclass class-default random-detecinterface fastethernet 0/0 service-policy output EXP2Cos exit

Question 20

An engineer wants to implement constraint-based routing. Which MPLS application should the engineer use?

unicast IP routing

MPLS VPN

MPLS TE

RSVP

Question 21

When implementing CBWFQ, where should Weighted Random Early Detection configuration be applied?

route-map

policy-map

class-map

service-policy

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Total 184 questions Full Exam Access