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Free 300-515 Sample Questions and 100% Cover Real Exam Questions (Updated 178 Questions)
NEW QUESTION # 19
Which two statements about MPLS L3 VPN RDs are true? (Choose two.)
- A. They are represented as 32-bit values
- B. They enable EIGRP to use address families to separate traffic between IPv4 and VPNv4.
- C. They are represented as 64-bit values.
- D. They enable OSPF to import and export routes into the global routing table of a router.
- E. E.They allow BGP to uniquely identify duplicate routes.
Answer: C,E
NEW QUESTION # 20
An engineer is investigating an EVPN traffic flow issue. Which type of traffic should the engineer allow in an EVPN Tree Service in order to fix this issue?
- A. known unicast from a root to another root
- B. multicast from a leaf to another leaf
- C. unknown unicast from a leaf to another leaf
- D. known unicast from a leaf to another leaf
Answer: A
NEW QUESTION # 21
Refer to the exhibit.
The CE router has established a BGP peering with the PE router, and the CE will use the core infrastructure of the PE as a backbone carrier to support CSC. Which additional task can you perform to complete the configuration?
- A. Configure OSPF on the PE router.
- B. Configure static routing on the CE router.
- C. Change the rd value to 65001:65001 under the VRF section of the PE router.
- D. Configure the address-family ipv4 labeled-unicast command under the neighbor configuration of the CE router for the PE.
Answer: A
NEW QUESTION # 22
Refer to the exhibit.
Refer to the exhibit Router 1 is a P router in the ISP MPLS core A connected P router cannot generate an MPLS label for the router 1 loopback0 interface Which action resolves this issue?
- A. A static route to null 0 must be added for the loopback interface and then static routes must be redistributed into OSPF
- B. The loopback0 interface must be in OSPF area 0.
- C. The network statement under the routing process must have a wildcard mask of 0 0.0 255.
- D. The OSPF network type must be changed on loopback0 to point-to-point
Answer: C
NEW QUESTION # 23
Refer to the exhibit.
PE1 and PE2 are exchanging VPNv4 routes for CE1 and CE2, and PE3 contains the default route to the internet. If the three devices are operating normally, which two conclusions describe this configuration? (Choose two.)
- A. All three routers must be running a distance-vector routing protocol.
- B. The CE1 and CE2 VRFs can exchange routes only between their respective VRFs on PE1 and PE2.
- C. All three routers must be running MP-BGP.
- D. Only the CE2 VRF can access the default route provided by the Internet VRF.
- E. The CE1 and CE2 VRFs can access the default route provided by the Internet VRF.
Answer: B,C
NEW QUESTION # 24
An engineer noticed that PE3 is failing to accept IPv6 traffic information from PE1.
The engineer confirmed that both PE3 and PE1 routers are configured accurately with IPv6 protocol.
To eliminate IPv6 traffic loss issue, which action must the engineer take to solve the problem?
- A. Configure 6PE forwarding between 6PE routers based on the IPv6 header
- B. Configure 6PE that provides global IPv6 reachability over IPv4 MPLS
- C. Allow PE routers use the MP-iBGP extensions in the IPv6 network configuration to exchange IPv6 reachability information.
- D. Disable 6PVE that provides local IPv6 reachability over MPLS.
Answer: B
NEW QUESTION # 25
Refer to the exhibit. What is the effect of this configuration?
- A. A Cisco MPLS TE tunnel is generated with 192.168.1.2 as the source IP address of router 1.
- B. An LSP virtual interface tunnel is created.
- C. Router 1 accepts multicast routes with a tag of 12:1
- D. The mroute table is cleared.
Answer: C
NEW QUESTION # 26
With Layer 3 MPLS VPN implementations on Cisco IOS XR PE routers, an interface is assigned to a VRF using the vrf command in which configuration mode?
- A. RP/0/RP0/CPU0:PE(config-vrf)#
- B. RP/0/RP0/CPU0:PE(config-if)#
- C. RP/0/RP0/CPU0:PE(config-bgp)#
- D. RP/0/RP0/CPU0:PE(config-bgp-af)#
Answer: B
NEW QUESTION # 27
Refer to the exhibit.
Which result occurs when PE1 learns a new MAC address and all three PEs are enabled with EVPN native?
- A. The MAC address is entered into the CAM table and is classified for use on the native VLAN
- B. A system notification is sent to the network administrator that triggers the manual configuration of the new MAC address on PE2 and PE3.
- C. The new MAC address is sent by BGP to PE2 and PE3 as a Type 2 BGP route.
- D. The MAC address is entered into the CAM table only if it is learned on the native VLAN.
Answer: C
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-4/lxvpn/configuration/ guide/b-l2vpn-cg-asr9000-64x/b-l2vpn-cg-asr9000-64x_chapter_01011.html
NEW QUESTION # 28
While configuring the VRF Selection feature, you get an error message after typing the below statement:
Router(config)#no vrf selection source 172.16.0.0 255.255.0.0 vrf VRF1
Which action caused this message?
- A. an attempt to configure a VRF Selection table that does not exist
- B. an attempt to remove a VRF Selection entry that does not exist
- C. an attempt to configure a VRF instance on an interface that already has VRF Selection configured
- D. the entry of an inconsistent IP address and mask for VRF Selection
Answer: B
NEW QUESTION # 29
Which two statements about implementing a separate MPLS VPN to provide customers Internet access are correct? (Choose two.)
- A. The Internet gateway router will act as a CE router.
- B. Internet routes will be leaked from the PE global routing table to the customer VRF.
- C. Customers will use separate interfaces for VPN and Internet access.
- D. Customers are assigned to the Internet VPN.
Answer: A,D
NEW QUESTION # 30
Which configuration must be performed when an engineer implements MP-BGP to exchange IPV6 routes?
- A. The bgp default ipv4-unicast command must be implemented on each router participating in MP- BGP.
- B. BGP peering must be activated under the IPv6 address family.
- C. BGP must be deployed in a fully meshed architecture within the autonomous system.
- D. The participating routers must be configured within the same autonomous system
Answer: B
Explanation:
MP-BGP separates each address family into its own "activate" stanza. Simply establishing the IPv4 session isn't enough - under router bgp ... you must enter address-family ipv6 unicast (or vpnv6 unicast for IPv6 VPNs) and issue neighbor <IP> activate. This tells BGP to carry and exchange IPv6 NLRI over that session.
NEW QUESTION # 31
Which flavor of MPLS Layer 3 VPN has MPLS enabled on PE-CE links?
- A. CSC
- B. inter-AS
- C. basic
- D. VPLS
- E. AToM
Answer: A
NEW QUESTION # 32
Refer to the exhibit.
Which statement about this output is true?
- A. The adjacent router is the egress LSR and has mpls ldp explicit-null configured.
- B. The zero in the second column is the normal behavior of an egress router LSR.
- C. The router IP 192.168.1.2 sent an implicit null, and the output is from the penultimate LSR.
- D. The adjacent LSR router configured mpls label range 0.
Answer: A
NEW QUESTION # 33
Which optional information can be included with an IPv6 ping to support the troubleshooting process?
- A. source MAC address
- B. destination MAC address
- C. IPv6 hostname
- D. IPv4 IP address
Answer: C
Explanation:
Reference:
<https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/configuration/xe-3s/ipv6-xe-36s-book/ip6- mng-apps.html>
NEW QUESTION # 34
Which tool identifies the point of failure in a P2MP LSP from the ingress LSR?
- A. P2MP traceroute
- B. SPAN
- C. Jitter TLV
- D. P2MP ping
Answer: A
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
NEW QUESTION # 35
Refer to the exhibit.
A customer carrier running MPLS VPN wants to utilize a backbone carrier to forward traffic and exchange VPNv4 prefixes between the two customer carriers networks depicted. Which two sets of routers must establish MP-iBGP sessions? (Choose two.)
- A. CC-PE-A and CC-PE-B
- B. CC-PE-A and CC-P-A
- C. BB-PE-A and CC-PE-B
- D. BB-PE-A and BB-PE-B
- E. BB-PE-A and BB-P-A
- F. CC-PE-A and BB-PE-A
Answer: A,D
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ias_and_csc/configuration/12-2sx/mp-ias- and-csc-12-2sx-book/mp-carrier-bgp.html
NEW QUESTION # 36
To maintain appropriate SLA levels, a network engineer must ensure that the ISP's network devices can perform fault detection, fault isolation, and fault reporting for LAN, MAN, and WAN segments. The implementation must adhere to these requirements:
- supported on all Ethernet interfaces
- allows for proactive fault detection and notification
- provides real-time monitoring and troubleshooting
- scalable and able to support large-scale Ethernet networks
Which action must the network engineer take to meet the requirements-
- A. Implement Ethernet CFM to verify connectivity and detect problems in the network.
- B. Enable E-PM to identify and troubleshoot performance issues.
- C. Enable IEEE 802.3ah EFM to gather performance metrics and provide alerts.
- D. Implement IP SLA to monitor network performance, packet drops, and network segment routing issues.
Answer: A
Explanation:
Ethernet CFM (Connectivity Fault Management, IEEE 802.1ag / ITU-T Y.1731) is designed specifically for carrier-grade Ethernet OAM. It provides scalable, hierarchical fault detection, isolation, and reporting across LAN, MAN, and WAN Ethernet segments. It supports proactive monitoring, real-time troubleshooting, and is available on all Ethernet interfaces, meeting the SLA requirements listed.
NEW QUESTION # 37
Refer to the exhibit. The CE router has established a BGP peering with the PE router, and the CE will use the core infrastructure of the PE as a backbone carrier to support CSC.
Which additional task can you perform to complete the configuration?
- A. Configure OSPF on the PE router.
- B. Configure static routing on the CE router.
- C. Change the rd value to 65001:65001 under the VRF section of the PE router.
- D. Configure the address-family ipv4 labeled-unicast command under the neighbor configuration of the CE router for the PE.
Answer: A
NEW QUESTION # 38
SIMULATION 7
Guidelines
This is a lab item in which tasks will be performed on virtual devices.
* Refer to the Tasks tab to view the tasks for this lab item.
* Refer to the Topology tab to access the device console(s) and perform the tasks.
* Console access is available for all required devices by clicking the device icon or using the tab(s) above the console window.
* All necessary pre-configurations have been applied.
* Do not remove any existing configurations from the devices, only those necessary to make the appropriate changes required to fulfill the listed tasks.
* Do not change the enable password or hostname for any device.
* Save your configurations to NVRAM before moving to the next item.
* Click Next at the bottom of the screen to submit this lab and move to the next question.
* When Next is clicked, the lab closes and cannot be reopened.
Topology
Tasks
CE1 and CE2 are IPv6 Customer Premise Equipment of two customers that communicate with each other through the MPLS L3VPN core comprising Provide Edge PE1, PE2, and route- reflector RR.
Perform the below configuration and verification tasks as noted.
1. Troubleshoot and modify the CEs to establish IPv6 BGP sessions with the PEs.
2. Troubleshoot and modify the PEs to receive the remote CE's advertised route in their BGP VRF table.
Initial configuration with IPv6 addressing has been completed. Do not change the configurations except to fulfill the abovementioned tasks. Apply the solution with the minimum configuration.
Answer:
Explanation:
1. On CE1 and CE2 - fix IPv6 eBGP toward the PE.
2. On PE1 and PE2 - activate the VRF IPv6 address-family and the CE neighbors so the PE learns the CE loopback prefixes in the VRF BGP table.
Configuration sketch
1. CEs - establish IPv6 BGP sessions with PEs
On CE1 (use the AS numbers and IPv6 addresses already present in the config):
ipv6 unicast-routing
router bgp <CE1-AS>
neighbor 172:1:2::PE1 remote-as <PE-AS>
!
address-family ipv6
neighbor 172:1:2::PE1 activate
network 192:1:1:1::1/128
exit-address-family
On CE2:
ipv6 unicast-routing
router bgp <CE2-AS>
neighbor 172:4:5::PE2 remote-as <PE-AS>
!
address-family ipv6
neighbor 172:4:5::PE2 activate
network 192:5:5:5::5/128
network 192:55:55:55::55/128
exit-address-family
If the neighbors already exist under router bgp, only the address-family ipv6 section and activate/network lines are needed.
2. PEs - ensure IPv6 VPNv6/VRF BGP is receiving the CE routes
On PE1, in the VRF used for CE1 (for example CUST-A):
router bgp <PE-AS>
address-family ipv6 vrf CUST-A
neighbor 172:1:2::CE1 activate
redistribute connected
exit-address-family
On PE2, in the same VRF:
router bgp <PE-AS>
address-family ipv6 vrf CUST-A
neighbor 172:4:5::CE2 activate
redistribute connected
exit-address-family
Verification (examples)
On CEs:
show bgp ipv6 unicast summary - eBGP session to the PE must be Established.
On PEs:
show bgp ipv6 vrf CUST-A - should list 192:1:1:1::1/128, 192:5:5:5::5/128 and
192:55:55:55::55/128.
From CE1:
ping ipv6 192:5:5:5::5 source 192:1:1:1::1 and
ping ipv6 192:55:55:55::55 source 192:1:1:1::1 should succeed.
The CE-PE links are IPv6 only, so BGP must use IPv6 neighbors and the IPv6 unicast address- family. Without activating the neighbors under the IPv6 address-family and advertising the loopback prefixes, the CE routers neither form IPv6 BGP sessions nor send their routes to the PEs.
On the PEs, the VRF for this customer must run the IPv6 VRF address-family and have the CE neighbors activated there. Only in that address-family are the CE IPv6 routes installed into the VRF BGP table. By also redistributing connected (or explicitly advertising the CE-connected prefixes), the PE injects the CE loopback routes into VPNv6 so that they are carried across the MPLS core and imported into the opposite PE's VRF, allowing full IPv6 reachability between the CE loopback addresses.
NEW QUESTION # 39
Refer to the exhibit. Router 1 is a P router in the ISP MPLS core.
A connected P router cannot generate an MPLS label for the router 1 loopback0 interface.
Which action resolves this issue?
- A. A static route to null 0 must be added for the loopback interface and then static routes must be redistributed into OSPF
- B. The loopback0 interface must be in OSPF area 0.
- C. The network statement under the routing process must have a wildcard mask of 0 0.0 255.
- D. The OSPF network type must be changed on loopback0 to point-to-point
Answer: C
NEW QUESTION # 40
Which two frames can be configured on an Ethernet flow point? (Choose two.)
- A. with different class of service values
- B. with identical type of service value
- C. with no tags
- D. of a specific VLAN
- E. with different type of service values
Answer: C,D
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/cether/configuration/xe-3s/asr903/16-5-1/b-ce- xe-16-5-asr900/trunk-efp-support.html
NEW QUESTION # 41
What is the primary function of a VRF on a router?
- A. It enables the router to provide faster switching through the network by using labels to identify the input and output interfaces for neighbor routers.
- B. It enables a router to configure VLANs locally, which provides segregation between networks.
- C. It enables the router to support multiple separate routing tables, which allows the device to handle overlapping IP addresses.
- D. 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.
Answer: C
NEW QUESTION # 42
Refer to the exhibit. If the two devices are operating normally, which two conclusions can you draw from this configuration? (Choose two.)
- A. CE1 is supporting CSC.
- B. CE1 must use OSPF to establish a neighbor relationship with PE1.
- C. PE1 labels the routes it learns from CE1 with the route-target 111:1 and shares them with its VPNv4 peers.
- D. The PE-CE routes between the devices are being exchanged by OSPF
- E. PE1 labels the routes it learns from CE1 with the route-target 222:2 and shares them with its VPNv4 peers.
Answer: C,D
Explanation:
The PE1↔CE1 link is 192.168.0.0/24 (PE1 Fa0/0/0 = .1 in vrf celvpn, CE1 Fa0/0/0 = .2). On that link, both sides run OSPF in area 1 - PE1 has router ospf 1 vrf celvpn and CE1 has router ospf
100, each with network 192.168.0.0 0.0.0.255. (CE1's BGP 65600 peers with 192.168.1.1 over its other interface, Fa0/0/1 - that's a separate device, not PE1.) PE1's VRF has route-target export 111:1. Routes the PE learns from CE1 inside vrf celvpn are tagged with the export RT - 111:1 - when redistributed into MP-BGP and advertised as VPNv4 prefixes to the other PEs. That's exactly the export-RT's job.
The PE-CE routing protocol on the 192.168.0.0/24 segment is OSPF on both ends, same area.
So PE1 and CE1 form an OSPF adjacency and exchange their routes via OSPF.
NEW QUESTION # 43
......
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