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The Best Cisco CCIE 400-151 Dumps Exam Practice Questions And Answers (1-20)
QUESTION 1
In MPLS-enabled network, which two improvements does EVPN provide compared to traditional VPLS?
A. Use of LDP to allocate EVPN-related labels
B. Per flow load balancing
C. Optimized learning and flooding process
D. Leveraging of enhanced VFIs to provide greater scalability
E. No need for exchange of MAC reachability between PEs
F. Use of BGP as a control-plane protocol
Correct Answer: B,C
QUESTION 2
A service provider engineering team must design a solution that supports end-to-end LSPs for multiple IGP domains within different AS numbers. According to RFC 3108, which solution achieves this goal?
A. LDP and BGP
B. BGP and send-label
C. RSVP and IS-IS or OSPF
D. RSVP and BGP
E. mLDP4
Correct Answer: B
QUESTION 3
Select two valid administratively scoped multicast addresses in networks running Interior Gateway protocols like EIGRP and OSPF (Choose two).
A. 239.255.255.255
B. 224.0.0.10
C. 239.0.0.1
D. 224.0.0.5
Correct Answer: A,C
QUESTION 4
The product team at an ISP that offers VoIP services wants to add two-way video conferencing to their product offering. Which three QoS methods can be applied for realtime traffic on WAN links with speeds that are slower than 768 Kbps? (Choose three.)
A. Apply voice-adaptive fragmentation to ensure that large video packets are fragmented and interleaved.
B. Apply LLQ with video traffic that is dedicated in the priority queue.
C. Apply MLP link fragmentation and interleaving to the interface.
D. Apply CBWFQ with video traffic in its own class, which is marked with aPHB value of AF41.
E. Apply CBWFQ with VoIP traffic in its own class, which is marked with aPHB value of EF.
F. Apply LLQ with both voice traffic and video traffic in the same priority queue
Correct Answer: C,D,E
QUESTION 5
An engineer is deploying RTBH. What is necessary routing constraint required for successful implementation? 400-151 dumps
A. The trigger device must have an iBGP session with all the clusters/route reflectors in the autonomous system.
B. The trigger device must redistribute the static route pointing to a null interface into the IGP process.
C. The no ip reachables command must be issued on the PE router interface under attack.
D. The attacker’s destination IP address must be routed to a null interface.
E. The eBGP sessions need to set the next-hop attribute value to the trigger device loopback interface.
Correct Answer: A
QUESTION 6
Where are MPLS point-to-multipoint traffic engineering packets replicated?
A. head-end router
B. branch-point router
C. midpoint router
D. leaf-point router
E. tail-end router
Correct Answer: B
QUESTION 7
Retaining LDP session if one links fail out of two for two neighbors.
A. MPLS LDP targeted-hello accept
B. MPLS LDP sync
C. MPLS IP
D. MPLS LDP autoconfig
Correct Answer: B
QUESTION 8
What is the minimum hardware configuration of the multishelf Cisco CRS-1 system?
A. One route processor (RP) card and one modular services card (MSC)
B. One distributed route processor (DRP) and one S13 fabric card (SFC)
C. One line card chassis (LCC) and one fabric card chassis (FCC)
D. One route processor (RP) and one fabric card chassis (FCC)
E. One line card chassis (LCC) and one S13 fabric card (SFC)
Correct Answer: C
QUESTION 9
Which QoS method is available when GRE is used to provide MPLS VPN services over an IP-only core?
A. matching MPLS EXP on the physical interface
B. matching EXP on the tunnel interface
C. matching DSCP on the physical interface
D. matching DSCP on the tunnel interface
Correct Answer: C
QUESTION 10
A company is deciding between an HVR and SVR solution in order to finalize a virtualization project proposal. Which is an advantage of a HVR solution versus a SVR solution?
A. A HVR solution implements dedicated data plane resources.
B. A HVR solution implements shared control plane resources.
C. A HVR solution introduces significant contention of resources.
D. A HVR solution implements dedicated chassis resources.
Correct Answer: A
QUESTION 11
Which are the three header fields that affect how Equal-Cost Multipath hashes traffic flow into interface groups? (Choose three.)
A. source MAC address
B. source port
C. source IP address
D. destination IP address
E. IP protocol ID
F. destination MAC address
Correct Answer: B,C,D
QUESTION 12
What loop prevention mechanism can be used for ospf type 3 sla in L3VPN?
A. DNbit
B. Pending
C. Pending
D. Pending
Correct Answer: A
QUESTION 13
Which description is true of that the fast-reroute keep all paths command accomplishes when used under OSPF process? 400-151 dumps
A. All possible alternate routes are installed in the OSPF RIB, even if the alternate paths do not meet the LFA criteria (the LFA inequalities)
B. By default, only the /32 routes have a backup path installed. This command creates a backup path for the router with any subnet mask.
C. Besides the regular LFA backup paths, this command also installs the remote LFA backup paths.
D. All backup routes – not only the best backup route are installed in the OSPF RIB.
Correct Answer: D
QUESTION 14
In an end-to-end Layer 2 service, which technology provides the capability to detect, verify, isolate, and report faults across a provider network?
A. carrier detect
B. UDLD
C. BFD
D. CFM
Correct Answer: D
QUESTION 15
Two routers that are running MPLS and LDP have multiple links that connect then to each other. An engineer wants to ensure that the label bindings are not flushed from the LIB if one of the links fails.
Which configuration meets this requirement?
A. The mpls ip command on an MPLS TE tunnel.
B. The mpls idp sync command under router process configuration mode.
C. The mpls Idp autoconfig command.
D. The mpls Idp discovery targeted-hello accept command
Correct Answer: A
QUESTION 16
A service provider requires that the PE-CE link must be optimized by only compressing the TCP header regards to business traffic policy. Neither voice traffic nor other traffic policies must be compressed.
Which solution meets these requirements?
A. enhanced RTP header compression
B. class-based TCP header compression
C. RTP header compression over satellite links
D. Header compression using IPHC profiles
Correct Answer: B
QUESTION 17
What is the BGP synchronization rule?
A. BGP should not advertise a route until that route has been learned via an IGP.
B. Routing information received through an EBGP session is not forwarding to another EBGP neighbor, only to IBGP neighbors.
C. BGP neighbor peering are established and synchronized using TCP.
D. BGP should not advertise a route when that route has been learned via an IGP
E. Routing information received through an IBGP session is not forwarding to another IBGP neighbor, only to EBGP neighbors.
Correct Answer: A
QUESTION 18
Two OSPF neighborrouters are stuck in the EXSTART state. After a while, the neighborship goes down. A network engineer is debugging the issue when both routers show the OSPF log message “too many retransmissions.” What is the possible root cause?
A. OSPF area mismatch
B. OSPF hello-interval mismatch
C. interface MTU mismatch
D. interface network type mismatch
Correct Answer: C
QUESTION 19
Which statement about Remotely Triggered Black Hole (RTBH) is true?
A. Route tagging is one of the techniques used by RTBH
B. It is used for BGP authentication
C. It cannot work with static routes
D. It uses extended ACLs for blocking attacks by creating a black hole
E. Before configuring RTBH. LDP must be enabled on the interface
Correct Answer: A
QUESTION 20
Customers connecting to a Service Provider for Internet access are intending to implement redundant peering. The design requirements call for preferring a primary link for both ingress and egress traffic. Secondary links should be used only during primary outages.
What two BGP deployment options will accomplish this design goal? 400-151 dumps (Choose two.)
A. On the router handling the secondary link, advertise routes with a MED value of 0.
B. On the router handling the primary link, set the weight for all incoming routes to be a value of 0.
C. On the router handling the secondary link, advertise all routes with a longer AS-PATH value.
D. On the router handling the primary link, advertise all routes with a longer AS-PATH value.
E. On the router handling the secondary link, set the local preference for all incoming routes to be a value of 0.
Correct Answer: C,E
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