Simulation 642-889 Samples 2021

NEW QUESTION 1
Refer the exhibit.




On PE7, how many multiprotocol IBGP routes are learned from PE8 and what is the next-hop IP address? {Choose two.}

• A. 1
• B. 2
• C. 3
• D. 10.8.1.1
• E. 172.16.8.1
• F. 192.168.108.81

Answer: BE

Explanation:
Show ip bgp vpnv4 all --- i tag field is the answer

NEW QUESTION 2
An engineer is configuring an EoMPLS circuit on a Cisco IOS XR router interface that removes a VLAN from the distribution layer. Which configuration accomplishes this configuration?

• A. interface GigabitEthernet 0/10.10 l2transport encapsulation dot1q 10l2vpnxconnect group 103588p2p 103588interface GigabitEthernet 2/10.10 neighbor ipv4 10.10.10.2 pw-id 103588
• B. interface GigabitEthernet 0/10.10 encapsulation dot1q 10rewrite ingress tag pop 1 symmetric l2vpnxconnect group 103588p2p 103588interface GigabitEthernet 0/10.10 neighbor ipv4 10.10.10.2 pw-id 103588
• C. interface GigabitEthernet 0/10.10 l2transport encapsulation dot1q 10rewrite ingress tag pop 1 symmetric l2vpnxconnect group 103588p2p 103588interface GigabitEthernet 0/10.10 neighbor ipv4 10.10.10.2 pw-id 103588
• D. interface GigabitEthernet 0/10.10 l2transport encapsulation dot1q 10rewrite ingress tag translate 1-to-1 dot1ad 10 symmetricl2vpnxconnect group 103588p2p 103588interface GigabitEthernet 0/10.10 neighbor ipv4 10.10.10.2 pw-id 103588

Answer: C

NEW QUESTION 3
A customer wants two separated sites to be connected via a pseudo-wire. Which solution provides the simplest implementation?

• A. AToM
• B. Layer 3 VPN
• C. VPLS
• D. GETVPN

Answer: A

NEW QUESTION 4
Refer to the exhibit.

Which two descriptions outline the traffic flow among the three sites? {Choose two.}

• A. The MNL site communicates with the XYZ and ABC sites.
• B. The XYZ and ABC sites communicate using the default route that points to the MNL site.
• C. XYZ sees the MNL and ABC routes.
• D. ABC sees the MNL and XYZ routes.
• E. The MNL site acts as a central site for the ABC and XYZ sites.

Answer: AE

NEW QUESTION 5
When implementing VPLS on Cisco IOS XR routers, the VPLS PW neighbors can be statically defined under which configuration mode?

• A. bridge group
• B. bridge-domain
• C. vfi
• D. mpls ldp
• E. l2transport

Answer: C

Explanation:

NEW QUESTION 6
Based on the Cisco IOS XR VRF configuration exhibit,

Which two data flows between the MPLS VPNs will be allowed? {Choose two.}

• A. The CustomerA central site can communicate with the CustomerB central site.
• B. The CustomerA central site can communicate with all CustomerA sites.
• C. The CustomerA central site can communicate with all CustomerB sites.
• D. The CustomerA sites can communicate with all CustomerB sites.

Answer: AB

NEW QUESTION 7
In MPLS Layer 3 VPN implementations, what is used at the PEs to transform the customer IPv4 prefixes into a unique 96-bit prefix?

• A. RT
• B. RD
• C. VC ID
• D. PW ID
• E. AS number

Answer: B

NEW QUESTION 8
Refer the exhibit.



Which statement is correct regarding the pseudowire on connects PE7 to the 10.8.1.1 neighbor?

• A. The control word is enabled on both ends of the pseudowire
• B. The MTU size is 1500 bytes on both ends of the pseudowire
• C. Pseudowire backup is enabled
• D. The pseudowire is in the down state

Answer: B

Explanation:

show xconnect all
show ip interface brief
show mpls l2transport vc
show cable l2-vpn xconnect mpls-vc-map

NEW QUESTION 9
Refer to the exhibit.

Given the output shown, which two statements are true? {Choose two.}

• A. The configured remote AS for neighbor 10.1.1.1 is 1234.
• B. Both prefixes that are referenced by network commands will be visible with the show bgp command from the information that is shown in the output.
• C. The neighbor 10.1.1.1 cannot learn any routes from this router.
• D. The router cannot learn any routes for neighbor 10.1.1.1.
• E. Routes from the Internet VRF that are injected into BGP through redistribution will be advertised to neighbor 10.1.1.1.

Answer: AC

NEW QUESTION 10
Which two Layer 2 VPN methods support interworking between customer sites with different Layer 2 encapsulation at each end {for example, Frame Relay to Ethernet interworking}? {Choose two.}

• A. AToM
• B. VPLS
• C. GET VPN
• D. L2TPv3

Answer: AD

Explanation:
http://www.cisco.com/en/US/docs/ios/12_3t/12_3t2/feature/guide/gtl2tpv3.html#wp1040784
The Layer 2 Tunnel Protocol Version 3 feature expands on Cisco support of the Layer 2 Tunnel Protocol Version 3 {L2TPv3}. L2TPv3 is an Internet Engineering Task Force {IETF} l2tpext working group draft that provides several enhancements to L2TP for the capability to tunnel any Layer 2 payload over L2TP.
Specifically, L2TPv3 defines the L2TP protocol for tunneling Layer 2 payloads over an IP core network using Layer 2 virtual private networks {VPNs}. Benefits of this feature include the following:
•L2TPv3 simplifies deployment of VPNs
•L2TPv3 does not require Multiprotocol Label Switching
•L2TPv3 supports Layer 2 tunneling over IP for any payload http://www.cisco.com/en/US/products/ps6646/products_ios_protocol_option_home.html
Cisco Any Transport over MPLS {AToM} is a solution for transporting Layer 2 packets over an MPLS backbone. It enables Service Providers to supply connectivity between customer sites with existing data link layer {Layer 2} networks via a single, integrated, packet-based network infrastructure: a Cisco MPLS network. Without separate networks that each have network management environments, Service Providers can deliver Layer 2 connections over an MPLS backbone.
Cisco AToM provides a common framework to encapsulate and transport supported Layer 2 traffic types over an MPLS network core. Service Providers can use a single MPLS network infrastructure to offer connectivity for supported Layer 2 traffic and for IP traffic in Layer 3 VPNs.

NEW QUESTION 11
VPWS/EoMPLS offers which type of Ethernet services as defined by the MEF?

• A. E-Tree
• B. E-LAN
• C. E-Line
• D. E-Interworking

Answer: C

Explanation:

• E-Line is based on a point-to-point Ethernet Virtual Connection. Two E-Line services are defined:
- Ethernet Private Line {EPL}: A very simple and basic point-to-point service characterized by low frame delay, frame delay variation, and frame loss ratio. No service multiplexing is allowed, and other than a committed information rate {CIR} no class of service {CoS} {Bandwidth Profiling} is allowed.
- Ethernet Virtual Private Line {EVPL}: A point-to-point service wherein service multiplexing {more than one Ethernet Virtual Connection} is allowed. The individual Ethernet Virtual Circuits can be defined with a rich set of Bandwidth Profiles and Layer 2 Control Protocol Processing methods as defined by the Metro Ethernet Forum.

NEW QUESTION 12
When configuring VPLS on the Cisco ASR 9000, which three configurations are required under the l2vpn configuration mode? {Choose three.}

• A. bridge-group
• B. bridge-domain
• C. xconnect
• D. vfi
• E. encapsulation

Answer: ABD

Explanation:

NEW QUESTION 13
Refer to the exhibit.

PE1 and PE2 are advertising the same subnet 196.168.10.0/24 to PE3. Which PE advertised subnet is installed at PE3 BGP table?

• A. PE2 subnet only due to the same RD value with PE1
• B. PE2 subnet only due to the same RD value with PE3
• C. Both PE1 and PE2 subnets due to exported subnet with RT matches import RT on PE3
• D. PE1 subnet only due to exported subnet with RT matches import RT on PE3

Answer: D

NEW QUESTION 14
Refer to the partial Cisco IOS XR PE router configuration exhibit for supporting a Layer 3 MPLS VPN customer using BGP as the CE-to-PE routing protocol.

The service provider AS number is 64500, the customer AS number is 64501, and the customer CE router is 10.1.1.1. What is missing in the configuration?

• A. The route distinguisher has not been configured under router bgp 64500 vrf Customer_A.
• B. The import and export route targets have not been configured under router bgp 64500 vrf Customer_A.
• C. The 10.1.1.1 BGP neighbor has not been activated for IPv4 unicast routing.
• D. The 10.1.1.1 BGP neighbor has not been activated for the VPNv4 address family.

Answer: A

Explanation:
http://www.cisco.com/en/US/docs/ios/12_2sr/12_2sra/feature/guide/srbgprid.html Route Distinguisher
A router distinguisher {RD} creates routing and forwarding tables and specifies the default route distinguisher for a VPN. The RD is added to the beginning of an IPv4 prefix to change it into a globally unique VPN-IPv4 prefix. An RD can be composed in one of two ways: with an autonomous system number and an arbitrary number or with an IP address and an arbitrary number. You can enter an RD in either of these formats:
•Enter a 16-bit autonomous system number, a colon, and a 32-bit number. For example: 45000:3
•Enter a 32-bit IP address, a colon, and a 16-bit number. For example: 192.168.10.15:1

NEW QUESTION 15
Which flavor of MPLS Layer 3 VPN has MPLS enabled on PE-CE links?

• A. basic
• B. CSC
• C. inter-AS
• D. AToM
• E. VPLS

Answer: B

Explanation:
http://www.cisco.com/en/US/docs/ios/12_0st/12_0st14/feature/guide/csc.html

NEW QUESTION 16
Which method is used to provide inter-AS AToM services?

• A. back-to-back VRF
• B. targeted LDP
• C. pseudowire stitching
• D. AToM interworking
• E. Cisco MPLS TE tunnels
• F. autodiscovery

Answer: C

Explanation:
http://www.cisco.com/en/US/docs/optical/cpt/r9_3/configuration/guide/cpt93_configuration_chapter_0111.html

NEW QUESTION 17
A service provider is tasked to write up a template for the network operations center to set up a Layer 2 VPN. Which command is the first command to issue on a Cisco IOS XR router?

• A. xconnect peer_ip vc_id encapsulation encapsulation_type
• B. connect name_pw interface_path_id dlci_value l2transport
• C. l2vpn
• D. pseudowire-class class_name

Answer: C

NEW QUESTION 18
Implementing H-VPLS instead of VPLS reduces which requirement?

• A. having a full mesh of PWs between all the PE routers in the service provider MPLS core
• B. having a full mesh of PWs between all the UPE routers
• C. having to implement QinQ tagging between the UPE and the NPE
• D. having to implement MPLS LDP between the UPE and the NPE
• E. the overhead of using BGP or LDP autodiscovery

Answer: A

Explanation:

NEW QUESTION 19
Refer to the exhibit.

XR2 must be configured with OSPF sham-link to PE1. Which configuration achieves this goal?

• A. router ospf 100 area 0sham-link 11.11.11.11 33.33.33.33
• B. router ospf 100vrf ABC area 0sham-link 33.33.33.33 11.11.11.11
• C. router ospf 100area 0 sham-link 33.33.33.33 11.11.11.11
• D. router ospf 100 vrf ABCarea 0 sham-link 11.11.11.11 33.33.33.33

Answer: B

NEW QUESTION 20
A customer needs Internet and MPLS services from the service provider and needs to ensure traffic from the Internet network does not constrain MPLS traffic. Which shared MPLS/Internet service type best accommodates this requirement?

• A. partial separation
• B. full separation
• C. Multisite Internet Access
• D. Internet tunnel over MPLS

Answer: B

NEW QUESTION 21
A presale engineer is asked to advise about the various MPLS VPN designs to best fit the customer requirements. Which two MPLS L2VPN features should be highlighted as advantages over a MPLS L3VPN? {Choose two.}

• A. An MPLS L2VPN design is a more appropriate solution for disaster recovery and data backup.
• B. An MPLS L2VPN is a more redundant design compared to a MPLS L3VPN solution.
• C. An MPLS L2VPN design does not require routing interaction with the service provider network.
• D. An MPLS L2VPN design virtually extends the broadcast domain boundary allowing for the customer IGP to fully interoperate between remote sites.
• E. An MPLS L2VPN design does not require monitoring, which provides a significant cost-saving solution.

Answer: CD

NEW QUESTION 22
When implementing H-VPLS with QinQ access on Cisco Metro Ethernet switches, which two commands enable the QinQ tagging? {Choose two.}

• A. encapsulation dot1q {customer-vlan} second-tag {sp-vlan}
• B. encapsulation dot1q {sp-vlan} second-tag {customer-vlan}
• C. switchport mode dot1q-tunnel
• D. switchport mode trunk
• E. switchport access vlan {sp-vlan}
• F. switchport access vlan {customer-vlan}

Answer: CE

NEW QUESTION 23
Which VPN technology allows remote sites with dynamic IP addresses to connect to a central hub?

• A. static IPsec tunnels
• B. site-to-site VPN
• C. DMPVN
• D. VRFs

Answer: C

NEW QUESTION 24
When verifying Layer 3 MPLS VPN operations, which Cisco IOS XR show command is best used to verify that the PE router is receiving the routes from the CE router?

• A. show route
• B. show route vrf vrf-name
• C. show bgp vpnv4 vrf vrf-name
• D. show bgp vpnv4 unicast ip-prefix

Answer: B

Explanation:
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.7/routing/configuration/guide/rc37rib.html

NEW QUESTION 25
In Layer 3 MPLS VPN implementations, if a customer is using the same AS number at both customer sites and the PE- to-CE routing protocol is BGP, what must be enabled on the PE router?

• A. BGP AS override
• B. BGP allowas-in
• C. BGP SOO extended community
• D. BGP AS path prepending

Answer: A

Explanation:
https://supportforums.cisco.com/docs/DOC-21837
Loop prevention in BGP is done by verifying the AS number in the AS Path. If the receiving router sees its own AS number in the AS Path of the received BGP packet, the packet is dropped. The receiving Router assumes that the packet was originated from its own AS and has reached the same place from where it originated initially.
The feature could be a disaster if customers are using same AS number along the various sites and disallows customer sites having identical AS numbers to be linked by another AS number. In such a scenario, routing updates from one site will be dropped when the other site receives them.
To override this feature, AS-Override function causes to replace the AS number of originating router with the AS number of the sending BGP router. The command is neighbor ip-address as-override and can only be executed under the VPNv4 address-family

NEW QUESTION 26
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