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1 / 60

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

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

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

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

2 / 60

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

Logging

RSVP

URPF

MPLS LSP ping

3 / 60

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

The STP mode must be MSTP

Bridge domains must belong to different MST instances

Bridge domains must be mapped to a different VLAN

The STP mode must be RSTP or PVST+

4 / 60

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?

Bud

Transit

Source

Headend

5 / 60

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

Multicast from a leaf to another leaf

Known unicast from a leaf to another leaf

Unknown unicast from a leaf to another leaf

6 / 60

An engineer is investigating an MPLS LDP issue. Which command should an engineer use on a Cisco IOS XE device to display the contents of the LFIB?

Show mpls ldp bindings

Show mpls ldp labels

Show mpls ldp neighbors

Show mpls forwarding-table

7 / 60

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

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

The adjacent LSR router configured mpls label range 0

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

8 / 60

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?

Debug

Ping

Show run

Traceroute

9 / 60

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

Of a specific VLAN, With no tags

With different type of service values, With different class of service values

With identical type of service value, With different class of service values

With different class of service values, Of a specific VLAN

With no tags, With identical type of service value

10 / 60

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

The STP mode must be MSTP

Bridge domains must belong to different MST instances

Bridge domains must be mapped to a different VLAN

The STP mode must be RSTP or PVST+

11 / 60

Which tool identifies the point of failure in a P2MP LSP from the ingress LSR?

P2MP traceroute

P2MP ping

SPAN

Jitter TLV

12 / 60

In a typical service provider environment, which two tools are used to help scale PE router connectivity requirements? (Choose two.)

Route reflectors, Confederations

VPNv4 address family, Cluster ID

Originator ID, Confederations

Cluster ID, Route reflectors

Confederations, VPNv4 address family

13 / 60

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

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

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

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

14 / 60

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?

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

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

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

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

15 / 60

Which two BGP attributes prevent loops in a route reflector environment? (Choose two.)

Cluster ID, Originator ID

Local preference, Origin

Origin, AS_PATH

Originator ID, Cluster ID

AS_PATH, Origin

16 / 60

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

Configure static routes for the VRF

Change the source IP address

Add the IP address to the VRF table

17 / 60

An engineer needs to improve MPLS network management by implementing a set of tools to support the NOC engineers in troubleshooting network failures.
Which feature should the engineer implement to check the connectivity of the MPLS LSP between the ingress and egress PE routers?

Extended ping

LDP autodiscovery

MPLS-TP

MPLS OAM

18 / 60

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.)

The operator adds in "host-routing" under the VRF EVPN, Type 2 routes contain inclusive source-specific multicast route information

Type 2 routes contain MAC/IP information, The operator adds in "host-routing" under the BVI651 interface

Type 2 routes contain Ethernet Auto-Discovery information, The operator adds in "host-routing" under the BVI651 interface

The operator adds in "host-routing" under the BVI651 interface, Type 2 routes contain MAC/IP information

Type 2 routes contain inclusive source-specific multicast route information, The operator adds in "host-routing" under the VRF EVPN

19 / 60

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 by encapsulating multiple frame formats with interworking

L3VPN with direct LSP connectivity between all PEs

L2VPN with the broadcast traffic processed at the ingress PE

20 / 60

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?

ping the connected neighbor

verify the RIB table routes

debug ARP

debug ping packets

21 / 60

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?

Interworking IP configuration on both the AC terminations on the PEs

Nonrouted interworking setup to properly translate only the Layer 2 information from the AC

Interworking IP configuration on the last PE router before label disposition

Tag-rewrite on the ingress and egress PE router

22 / 60

Which mechanism reduces the network flooding caused by host ARP learning behavior?

Root guard

BPDU guard

Storm control

ARP suppression

23 / 60

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 used to provide single connection from a CE device to a service provider

They are multihoming mechanisms used for CE devices

They are default gateway redundancy options

24 / 60

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.)

TCP MD5 authentication, control message rate limiting

control message hashing, CHAP authentication

CHAP authentication, asymmetric mutual authentication with PSK

Control message rate limiting, Control message hashing

Asymmetric mutual authentication with PSK, TCP MD5 authentication

25 / 60

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

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 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

26 / 60

Refer to the exhibit. An engineer is trying to configure an EVPN VWPS. What is the issue with this configuration?

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

The service instance and the EVPN instance are different

The member in the VPWS context should be the PE-facing interface

The 12vpn evpn command should be instance 101

27 / 60

Which optional information can be included with an IPv6 ping to support the troubleshooting process?

IPv6 hostname

destination MAC address

source MAC address

IPv4 IP address

28 / 60

Which BGP feature causes to replace the AS number of originating router with the AS number of the sending router?

Confederations

Route dampening

Route reflectors

AS override

29 / 60

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 static route to null 0 must be added for the loopback interface and then static routes must be redistributed into OSPF

The OSPF network type must be changed on loopback0 to point-to-point

The network statement under the routing process must have a wildcard mask of 0 0

The loopback0 interface must be in OSPF area 0

30 / 60

Topic 1What is the primary function of a VRF on a router?

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 View answer Correct Answer: A

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

31 / 60

What is the effect of this configuration?

An LSP virtual interface tunnel is created

A Cisco MPLS TE tunnel is generated with 192

Router 1 accepts multicast routes with a tag of 12:1

The mroute table is cleared

32 / 60

A customer carrier running

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.)

BB-PE-A and BB-P-A

BB-PE-A and CC-PE-B

CC-PE-A and BB-PE-A

CC-PE-A and CC-PE-B

BB-PE-A and BB-PE-B

CC-PE-A and CC-P-A

33 / 60

Topic 1Which utility can you use to validate an LSP in an MPLS environment?

logging

RSVP

uRPF

MPLS LSP ping

34 / 60

While implementing Layer 3 MPLS VPN, which feature should an engineer use at the PEs to transform the customer IPv4 prefixes into a unique 96-bit prefix

PW ID

VC ID

35 / 60

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?

Source

Bud

Transit

Headend

36 / 60

How does Layer 3 VPN traffic traverse an ISP network?

Devices on the network use MPLS labels to move VPN traffic through the network

Devices on the network use GRE tunnels to move traffic between VRFs

Devices on the network use LSAs to share routes between P routers in the network

Devices on the network use MPLS labels to share VPN routes between P routers in the network

37 / 60

Which type of VPN allows communication within a single autonomous system (AS)?

Extranet VPN

Intra-AS VPN

Remote Access VPN

Inter-AS VPN

38 / 60

Which of the following is a benefit of Layer 2 service architecture?

Extends LAN connectivity over WANX`

Offers support for a wide range of routing protocols

Enables easy management of network resources

Offers high scalability for large networks

39 / 60

What is the purpose of PE-CE route advertisement in L3VPN?

To provide end-to-end encryption for customer traffic

To distribute VPN routes between PE routers

To enable VRF-to-VRF communication

To distribute customer routes between PE and CE routers

40 / 60

What is the format of a VPNv4 address in L3VPN?

IPv6 address + AS number

IPv4 address + AS number

IPv6 address + VRF name

IPv4 address + VRF name

41 / 60

What is the function of the underlay label in L3VPN?

To specify the next-hop router for a packet

To provide end-to-end encryption for a packet

To enable load balancing between multiple paths

To identify the destination VRF for a packet

42 / 60

Which protocol is used for the control plane in EVPN?

BGP

IS-IS

RIP

OSPF

43 / 60

What is the purpose of MAC address suppression in EVPN?

To reduce the amount of broadcast traffic

To improve the convergence time of the network

To improve the security of the network

To reduce the size of the MAC address table

44 / 60

Which type of multicast VPN allows for multicast traffic to be transmitted between sites of different VPNs?

Shared Tree MVPN

Source Tree MVPN

Intranet MVPN

Extranet MVPN

45 / 60

What is the PE-CE routing protocol used for IPv6 VPNs?

EIGRP

RIPng

OSPFv3

BGP

46 / 60

Which command is used to troubleshoot the BGP IPv6 VPN configuration on Cisco IOS routers?

show bgp ipv6 vpnv6 unicast all

show bgp ipv6 unicast summary

show ipv6 interface

show ipv6 route

47 / 60

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-vrf)#

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

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

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

48 / 60

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?

VRF name mismatch between the PE routers

RD export and import configuration errors

RD mismatch between the PE routers

RT export and import configuration errors

49 / 60

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-CE must support OSPFv3

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

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

50 / 60

A network engineer is implementing Layer 3 MPLS VPNs on Cisco IOS/IOS XE PE routers. Which PE-to-CE routing protocol requires a separate routing process to be created for each VRF?

EIGRP

RIPv2

BGP

OSPF

51 / 60

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 l2transport encapsulation dot1q 10 l2vpn xconnect group 103588 p2p 103588 interface GigabitEthernet 2/10.10 neighbor ipv4 10.10.10.2 pw-id 103588

Interface GigabitEthernet 0/10.10 l2transport encapsulation dot1q 10 rewrite ingress tag translate 1-to-1 dot1ad 10 symmetric l2vpn xconnect group 103588 p2p 103588 interface GigabitEthernet 0/10.10 neighbor ipv4 10.10.10.2 pw-id 103588

Interface GigabitEthernet 0/10.10 encapsulation dot1q 10 rewrite ingress tag pop 1 symmetric l2vpn xconnect group 103588 p2p 103588 interface GigabitEthernet 0/10.10 neighbor ipv4 10.10.10.2 pw-id 103588

Interface GigabitEthernet 0/10.l2transport encapsulation dot1q 10 rewrite ingress tag pop 1 symmetric l2vpn xconnect group 103588 p2p 103588 interface GigabitEthernet 0/10.10 neighbor ipv4 10.10.10.2 pw-id 103588

52 / 60

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

It configures MPLS traffic engineering

It configures an IPv4 peering with 192.168.1.1

It configures VPWS multihomed

It configures VPWS single homed

53 / 60

An engineer is troubleshooting AToM on an IOS XE router and receives an error when creating the xconnect.
Which command does he need to complete to create the xconnect in AToM?

protocol none

protocol 12tpv3

encapsulation 12tpv3

encapsulation mpls

54 / 60

What must match in the EVPN and L2VPN configuration mode when configuring EVPN native in a router?

EVI

Bridge domain

Interface

Address family

55 / 60

Refer to the exhibit.

An organization is running H-VPLS on a network comprising four routers in a hub-and-spoke topology with R1 as the hub An engineer added a new spoke with multiple VCs to the network, and now traffic cannot flow properly How should the engineer update the configuration on R1 to correct the problem?

Disable Cisco Discovery Protocol to allow for neighbor discovery

Disable Cisco Discovery Protocol to allow MPLS to share labels between the designated spokes

Disable spanning tree to allow loops to occur within the hub-and-spoke topology

Disable split horizon to allow multiple VCs per spoke

56 / 60

Refer to the exhibit.

What is shown in this output?

the labels received and advertised on PE1

LDP neighbor statuses

BGP is used between neighbors that are exchanging MPLS labels

local and outgoing abels are updated in hardware

57 / 60

What is a requirement to share VRF reachability information to all members of a VPN when using IPv6?

All PEs must have the same VRFs configured

PE routers must have MPLS disabled and be running MP-BGP between all P and PE routers

PE and CE routers must be running BGP as the PE-CE routing protocol

PE routers must be running MP-BGP and bgp default ipv4-unicast must be disabled

58 / 60

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?

Configure 6PE forwarding between 6PE routers based on the IPv6 header

Disable 6PVE that provides local IPv6 reachability over MPLS

Configure 6PE that provides global IPv6 reachability over IPv4 MPLS

Allow PE routers use the MP-iBGP extensions in the IPv6 network configuration to exchange IPv6 reachability information

59 / 60

Which effect of this configuration is true?

It configures an IPv4 peering with 192.168.1.1

It configures MPLS traffic engineering

It configures VPWS multihomed

It configures VPWS single homed

60 / 60

How do PE routers exchange CE routes between remote sites?

By converting CE routes into VPNv4 routes and exchanging them using the global IGP

By establishing BGP neighbor relationships between all connected CEs to exchange routing information

By learning IPv4 routes from connected CEs and redistributing them into the global IGP

By converting CE routes into VPNv4 routes and exchanging them using MP-BGP

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