300-515 実際試験問題と解答 - 模擬練習 - 受験自信を増やす

Question No : 1
Which utility can you use to validate an LSP in an MPLS environment?

A.uRPF
B.MPLS LSP ping
C.logging
D.RSVP

正解:

Question No : 2
You are troubleshooting ARP connectivity issues for an Ethernet interface on an IOS XR network that runs IS- IS. You verify that the IGP protocol is running, but an ARP entry has not yet been created.
Which action should you take?

A.debug ping packets
B.debug ARP
C.ping the connected neighbor
D.verify the RIB table routes

正解:

Question No : 3
In a typical service provider environment, which two tools are used to help scale PE router connectivity requirements? (Choose two.)

A.route reflectors
B.VPNv4 address family
C.originator ID
D.cluster ID
E.confederations

正解:

Question No : 4
In an Ethernet Virtual Circuit environment, which restriction do bridge domains have when STP is running?

A.The STP mode must be RSTP or PVST+
B.Bridge domains must be mapped to a different VLA
C.The STP mode must be MSTP
D.Bridge domains must belong to different MST instances.

正解:
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/ce/b_ce_xe-313s-asr920-book/b_ce_xe-313s-asr920-book_chapter_01.html#reference_770349446ED24E83821EF701DDC46BFD

Question No : 5
Refer to the exhibit.

An engineer is implementing an MPLS P2MP TE solution .
Which type of router can serve as the midpoint router and the tailend router in this P2MP TE network implementation?

A.headend
B.source
C.transit
D.bud

正解:
Explanation:
https://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/mpls/mp-te-path-setup-xe-3s-asr920-book/mp-te-path-setup-xe-3s-asr920-book_chapter_01.html

Question No : 6
Refer to the exhibit.

A network operator is implementing EVPN IRB on PE1 .
Which two command placements enable the advertisement of Type 2 routes and what information do Type 2 routes contain? (Choose two.)

A.The operator adds in “host-routing” under the VRF EVP
B.Type 2 routes contain MAC/IP information.
C.Type 2 routes contain Ethernet Auto-Discovery information.
D.The operator adds in “host-routing” under the BVI651 interface.
E.Type 2 routes contain inclusive source-specific multicast route information.

正解:
Explanation:
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5500/vpn/61x/b-ncs5500-l2vpn-configuration-guide-61x/b-ncs5500-l2vpn-configuration-guide-61x_chapter_01010.html

Question No : 7
Refer to the exhibit.

A network engineer has been called to configure the four PE devices in order to enable full communication among the four CE devices connected to them. While starting to configure, he experienced a connectivity issue .
Which two tasks should the engineer perform in order to begin the process correctly? (Choose two.)

A.Configure PE3 to export route-targets 100:1 and 200:2.
B.Configure PE3 to import route-targets 100:1 and 200:2.
C.Configure PE4 to import route-targets 101:1 and 202:2.
D.Configure PE2 to export route-targets 300:3 and 400:4.
E.Configure PE1 to import route-targets 300:3 and 400:4.

正解:

Question No : 8
Refer to the exhibit.

Which statement about this output is true?

A.The router IP 192.168.1.2 sent an implicit null, and the output is from the penultimate LS
B.The adjacent router is the egress LSR and has mpls ldp explicit-null configured.
C.The adjacent LSR router configured mpls label range 0.
D.The zero in the second column is the normal behavior of an egress router LS

正解:

Question No : 9
What is the primary function of a VRF on a router?

A.It enables the router to support multiple separate routing tables, which allows the device to handle overlapping IP addresses.
B.It enables a router to run BGP and a distance vector routing protocol at the same time, which allows it to serve as a VPN endpoint between remote sites.
C.It enables a router to configure VLANs locally, which provides segregation between networks.
D.It enables the router to provide faster switching through the network by using labels to identify the input and output interfaces for neighbor routers.

正解:

Question No : 10
Which two are characteristics of using a non-MPLS peer-to-peer model over a traditional overlay model? (Choose two.)

A.The model is suited for nonredundant configurations.
B.The configuration on a newly added site PE is updated automatically.
C.Provider routers know the customer network topology.
D.The customer specifies the exact site-to-site traffic profile.
E.Routing information is exchanged between the customer router and one or a few PEs.

正解:
Explanation:
Reference: http://etutorials.org/Networking/MPLS+VPN+Architectures/Part+2+MPLS-based+Virtual+Private+Networks/Chapter+7.+Virtual+Private+Network+VPN+Implementation+Options/Overlay+and+Peer-to-peer+VPN+Model/

Question No : 11
An engineer is troubleshooting an ongoing network outage .
Which command should he use that can display the live log files for a process or service running on a network device?

A.traceroute
B.show run
C.ping
D.debug

正解:

Question No : 12
The CTO of a company requires the support of a network consultant to deliver an MPLS solution without resigning to a certain degree of redundancy and scalability .
Which solution effectively scales to hundreds or thousands of sites?

A.L2VPN with the broadcast traffic processed at the ingress P
B.L3VPN with direct LSP connectivity between all PEs.
C.L2VPN by encapsulating multiple frame formats with interworking.
D.L3VPN using a hierarchical topology of N-PEs and U-PEs.

正解:

Question No : 13
You try to configure MPLS VPN VRF Selection based on a source IP address on an interface that has VRF configured, but you receive an error.
Which action must you take to correct the problem?

A.Change the source IP address.
B.Add the IP address to the VRF table.
C.Remove the VRF from the interface.
D.Configure static routes for the VR

正解:
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/vrfselec.html

Question No : 14
Which two BGP attributes prevent loops in a route reflector environment? (Choose two.)

A.cluster ID
B.local preference
C.origin
D.originator ID
E.AS_PATH

正解:
Explanation:
Reference: https://www.ciscopress.com/articles/article.asp?p=2756480&seqNum=10

Question No : 15
Which tool identifies the point of failure in a P2MP LSP from the ingress LSR?

A.Jitter TLV
B.SPAN
C.P2MP traceroute
D.P2MP ping

正解:
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r5-3/mpls/configuration/guide/b-mpls-cg53x-asr9k/b-mpls-cg53x-asr9k_chapter_01000.html

Cisco 300-515 問題練習