What is the primary function of a VRF on a router?

It enables the router to support multiple separate routing tables, which allows the device to handle overlapping IP addresses.

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.

It enables a router to configure VLANs locally, which provides segregation between networks.

It enables the router to provide faster switching through the network by using labels to identify the input and output interfaces for neighbor routers.

Which two statements describe primary differences between MPLS Layer 2 and Layer 3 VPNs?(Choose two.)

Layer 2 VPNs use AToM, but Layer 3 VPNs use MPLS/BGP.

Layer 2 VPNs use L2TPv3 tunneling, but Layer 3 VPNs use GRE tunneling.

Layer 2 VPNs use IPsec tunneling, but Layer 3 VPNs use L2TPv3 tunneling.

Layer 2 VPNs use AToM, but Layer 3 VPNs use MPLS/BGP.

Layer 2 VPNs use BGP, but Layer 3 VPNs use VPLS.

Layer 2 VPNs use L2TPv3 tunneling, but Layer 3 VPNs use GRE tunneling.

Layer 2 VPNs use IPsec tunneling, but Layer 3 VPNs use pseudowires to provide tunneling.

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.)

Configure PE3 to export route-targets 100:1 and 200:2. B. Configure PE3 to import route-targets 100:1 and 200:2.

Configure PE4 to import route-targets 101:1 and 202:2. D. Configure PE2 to export route-targets 300:3 and 400:4.

Configure PE3 to export route-targets 100:1 and 200:2. B. Configure PE3 to import route-targets 100:1 and 200:2.

Configure PE4 to import route-targets 101:1 and 202:2. D. Configure PE2 to export route-targets 300:3 and 400:4.

Configure PE1 to import route-targets 300:3 and 400:4.

Refer to the exhibit. If the two devices are operating normally, which two conclusions can you draw from this configuration? (Choose two.)

CE1 must use OSPF to establish a neighbor relationship with PE1.

The PE-CE routes between the devices are being exchanged by OSPF

CE1 must use OSPF to establish a neighbor relationship with PE1.

PE1 labels the routes it learns from CE1 with the route-target 222:2 and shares them with its VPNv4 peers.

PE1 labels the routes it learns from CE1 with the route-target 111:1 and shares them with its VPNv4 peers.

The PE-CE routes between the devices are being exchanged by OSPF

Which two frames can be configured on an Ethernet flow point?(Choose two.)

with different type of service values

with identical type of service value

with different class of service values

In an Ethernet Virtual Circuit environment, which restriction do bridge domains have whenSTP is running?

The STP mode must be RSTP or PVST+

Bridge domains must be mapped to a different VLAN.

Bridge domains must belong to different MST instances.

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?

known unicast from a root to another root

known unicast from a leaf to another leaf

unknown unicast from a leaf to another leaf

multicast from a leaf to another leaf

known unicast from a root to another root

Refer to the exhibit. Which statement about this output is true?

The adjacent router is the egress LSR and has mpls ldp explicit-null configured.

The router IP 192.168.1.2 sent an implicit null, and the output is from the penultimate LSR.

The adjacent router is the egress LSR and has mpls ldp explicit-null configured.

The adjacent LSR router configured mpls label range 0.

The zero in the second column is the normal behavior of an egress router LSR.

An ISP provides a major client MPLS VPN for managed services. The MPLS engineering team needs to use the advanced VPN feature of selective VRF import so that only specific prefixes are present in the required VPNs.Which aspect of this feature must the team consider?

A route is imported into the VRF only when at least one RT that is attached to the route matches one RT that is configured in the VRF and the route is permitted by the import route map.

A route must pass the import route map first and then the route target import filter.

The routers that are imported in the VRF can be BGP and IGP routes, so other match conditions in the route map, besides communities, can be used.

The import-map command is applied under the PE interface that connects to the CE router.

A route is imported into the VRF only when at least one RT that is attached to the route matches one RT that is configured in the VRF and the route is permitted by the import route map.

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 VRF1Which action caused this message?

an attempt to remove a VRF Selection entry that does not exist

the entry of an inconsistent IP address and mask for VRF Selection

an attempt to configure a VRF instance on an interface that already has VRF Selection configured

an attempt to remove a VRF Selection entry that does not exist

an attempt to configure a VRF Selection table that does not exist

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.)

Type 2 routes contain MAC/IP information.

The operator adds in “host-routing” under the BVI651 interface.

The operator adds in “host-routing” under the VRF EVPN.

Type 2 routes contain MAC/IP information.

Type 2 routes contain Ethernet Auto-Discovery information.

The operator adds in “host-routing” under the BVI651 interface.

Type 2 routes contain inclusive source-specific multicast route information.

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?

Remove the VRF from the interface.

Add the IP address to the VRF table.

Remove the VRF from the interface.

Configure static routes for the VRF.

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?

L3VPN using a hierarchical topology of N-PEs and U-PEs.

L2VPN with the broadcast traffic processed at the ingress PE.

L3VPN with direct LSP connectivity between all PEs.

L2VPN by encapsulating multiple frame formats with interworking.

L3VPN using a hierarchical topology of N-PEs and U-PEs.

Which two are characteristics of using a non-MPLS peer-to-peer model over a traditional overlay model? (Choose two.)

Provider routers know the customer network topology.

Routing information is exchanged between the customer router and one or a few PEs.

The model is suited for nonredundant configurations.

The configuration on a newly added site PE is updated automatically.

Provider routers know the customer network topology.

The customer specifies the exact site-to-site traffic profile.

Routing information is exchanged between the customer router and one or a few PEs.

While troubleshooting an AToM L2VPN service, a network consultant notices that the AC Layer 2 encapsulations are different. Which action should the consultant take in order to make the MPLS L2VPN work?

tag-rewrite on the ingress and egress PE router

interworking IP configuration on the last PE router before label disposition

nonrouted interworking setup to properly translate only the Layer 2 information from the ACD. interworking IP configuration on both the AC terminations on the PEs

What do EVPN single-active and all-active have in common?

They are both roles that a designated router can take when MPLS is used with EVPN.

They are default gateway redundancy options.

They are multihoming mechanisms used for CE devices.

They are used to provide single connection from a CE device to a service provider.

They are both roles that a designated router can take when MPLS is used with EVPN.

Refer to the exhibit. An engineer is trying to configure an EVPN VWPS. What is the issue with this configuration? A.The member in the VPWS context should be the PE-facing interface.

The service instance and the EVPN instance are different.

The 12vpn evpn command should be instance 101.

Interface GigabitEthernet0/1/0 should not have any IP address.

The service instance and the EVPN instance are different.

Refer to the exhibit. Which result occurs when PE1 learns a new MAC address and all three PEs are enabled with EVPN native?

The new MAC address is sent by BGP to PE2 and PE3 as a Type 2 BGP route.

A system notification is sent to the network administrator that triggers the manual configuration of the new MAC address on PE2 and PE3.

The new MAC address is sent by BGP to PE2 and PE3 as a Type 2 BGP route.

The MAC address is entered into the CAM table and is classified for use on the native VLAN

The MAC address is entered into the CAM table only if it is learned on the native VLAN.

A network architect is troubleshooting the L2TPv3 tunneling security due to the untrusted nature of the underlaying network. Which two L2TPv3 features does the architect deploy to address the ongoing issues?(Choose two.)

asymmetric mutual authentication with PSK

Refer to the exhibit. Which effect of this configuration is true?

It configures VPWS single homed.

It configures an IPv4 peering with 192.168.1.1

It configures MPLS traffic engineering.

An engineer is troubleshooting an EoMPLS circuit on a Cisco IOS XR router interface that removes a VLAN from the distribution layer. Which configuration should the engineer apply in order to accomplish the task?

interface GigabitEthernet 0/10.10 l2transportencapsulation dot1q 10 l2vpnxconnect group 103588 p2p103588interface GigabitEthernet 2/10.10 neighboripv4 10.10.10.2 pw-id 103588

interface GigabitEthernet 0/10.l2transportencapsulation dot1q 10 rewrite ingresstag pop 1 symmetricl2vpnxconnect group 103588 p2p103588interface GigabitEthernet 0/10.10neighbor ipv4 10.10.10.2 pw-id 103588

interface GigabitEthernet 0/10.10encapsulation dot1q 10 rewrite ingresstag pop 1 symmetricl2vpnxconnect group 103588 p2p103588interface GigabitEthernet 0/10.10 neighboripv4 10.10.10.2 pw-id 103588

interface GigabitEthernet 0/10.10 l2transportencapsulation dot1q 10 l2vpnxconnect group 103588 p2p103588interface GigabitEthernet 2/10.10 neighboripv4 10.10.10.2 pw-id 103588

interface GigabitEthernet 0/10.10 l2transportencapsulation dot1q 10rewrite ingress tag translate 1-to-1 dot1ad 10symmetricl2vpnxconnect group 103588 p2p 103588interface GigabitEthernet 0/10.10 neighboripv4 10.10.10.2 pw-id 103588

Which condition must be met before an environment can support CSC?

The CSC-PE and CSC-CE devices must be able to send labels to one another using BGP.

The CSC-PE and CSC-CE must each be able to ping an interface in its respective global routing table.

The CSC-PE and the CSC-CE must support IPv6.

The CSC-PE and CSC-CE devices must be able to send labels to one another using BGP.

The CSC-CE must support OSPFv3.

In Layer 3 MPLS VPN implementations, if some of the VPNv4 routes on one PE router do not appear on another PE router, what could be the problem?

RT export and import configuration errors

RD mismatch between the PE routers

RT export and import configuration errors

VRF name mismatch between the PE routers

RD export and import configuration errors

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?

RP/0/RP0/CPU0:PE(config-bgp-af)#

Cisco 300-515 Practice Test 1 - Free Online Exam Prep & Questions

Which utility can you use to validate an LSP in an MPLS environment?

uRPF

MPLS LSP ping

logging

RSVP

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