Cisco 642-889 Torrent 2021

NEW QUESTION 1
Refer the exhibit.



On PE7, what is the pseudowire ID that connects to the 10.8.1.1 neighbor?

• A. 70
• B. 80
• C. 123
• D. 0x840001
• E. 0x4000080

Answer: C

Explanation:
# show vfi

NEW QUESTION 2
On Cisco IOS and IOS XE Layer 3 MPLS VPN implementations, when redistributing the customer RIP routes into MP- BGP, the RIP metric is copied into which BGP attribute?

• A. local preference
• B. weight
• C. MED
• D. extended community

Answer: C

Explanation:
https://supportforums.cisco.com/thread/191993
Use the red bgp <asn> metric transparent command to preserve the RIP metrics.
When RIP routes are redistributed into BGP, the route metric is stored in the BGP MED value. When BGP routes are redistributed into RIP, and the transparent keyword used, the MED value is copied back as the RIP metric. Without the transparent keyword, the metric value specified is applied to all the routes.

NEW QUESTION 3
Refer the exhibit.



On PE7, which encapsulation method is used on the pseudowire that connects to the 10.8.1.1 neighbor?

• A. MPLS
• B. L2TPv3
• C. IP
• D. LDP
• E. Ethernet

Answer: B

Explanation:

show xconnect all
check value is mpls or l2tp or Ethernet etc in segment field

NEW QUESTION 4
Refer the exhibit.




On PE7, which interface connects to the CE7 and what is the name of the VRF that interface is associated to? {Choose two.}

• A. Gi0/0/0/0
• B. Gi0/0/0/1
• C. Gi0/0/0/2
• D. Customer_1
• E. Customer_A
• F. Customer_CE7

Answer: BC

Explanation:
# show ip vrf interfaces

NEW QUESTION 5
What is the purpose of the route distinguisher in a service provider network?

• A. to identify which prefixes should be imported
• B. to identify customer local prefixes
• C. to identify customer global prefixes
• D. to identify which prefixes should be exported from BGP

Answer: C

NEW QUESTION 6
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 7
When implementing VPLS on Cisco IOS XR routers, the customer-facing subinterfaces on the PE routers are assigned to which Cisco EVC component?

• A. bridge group
• B. bridge domain
• C. VFI
• D. Layer 2 transport
• E. BVI

Answer: B

Explanation:

NEW QUESTION 8
Which three possible misconfigurations can occur on the backbone IGP section of an MPLS Layer 3 VPN setup? {Choose three.}

• A. configuring the LDP router ID with an incorrect loopback interface
• B. configuring the wrong AS number on a client eBGP peering
• C. configuring the wrong area number on a PE-CE OSPF link
• D. decreasing the MPLS MTU
• E. disabling MPLS on a core link
• F. disabling MPLS LDP sync in the IGP routing process

Answer: ADE

NEW QUESTION 9
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 10
Which Layer 2 protocol parameters can be carried inside the control word when implementing AToM service?

• A. PW ID
• B. Frame Relay FECN, BECN, and DE bits
• C. encapsulation type
• D. VC type

Answer: B

Explanation:
http://www.cisco.com/en/US/products/ps6603/products_qanda_item09186a008009d4e3.shtml#wp39173
Q. How does Frame Relay over MPLS work?
A. Traffic is encapsulated in MPLS packets and forwarded across the MPLS network. When encapsulating Frame Relay over MPLS, the Frame Relay header and the frame check sequence {FCS} are stripped from the packet. The bits for Backward Explicit Congestion Notification {BECN}, Forward Explicit Congestion Notification {FECN}, Discard Eligibility {DE} and Command/Response {C/R} are carried across the MPLS network in the "Control Word" header.

NEW QUESTION 11
In which Cisco IOS XR configuration mode is the redistribute static command applied to enable the redistribution of static VRF routes between the PE routers?

• A. RP/0/RP0/CPU0:PE{config-router}#
• B. RP/0/RP0/CPU0:PE{config-bgp}#
• C. RP/0/RP0/CPU0:PE{config-bgp-vrf}#
• D. RP/0/RP0/CPU0:PE{config-bgp-vrf-af}#

Answer: D

Explanation:
http://www.cisco.com/en/US/docs/routers/asr9000/software/routing/configuration/guide/rcasr9kstat.html#wp1041 359

NEW QUESTION 12
What is the primary difference between 6PE and 6VPE?

• A. 6VPE does not require an MPLS core.
• B. 6VPE requires an IPv6-aware core.
• C. 6VPE provides IPv6 VPN services.
• D. 6VPE tunnels IPv6 packets inside IPv4 packets.

Answer: C

Explanation:
6PE is for transporting ipv6 natively and 6VPE is for ipv6 mpls vpns

NEW QUESTION 13
Refer to the partial Cisco IOS XR PE router configuration exhibit for supporting a Layer 3 MPLS VPN customer using EIGRP AS 20 as the CE-to-PE routing protocol.

The MPLS VPN customer is having problems receiving the EIGRP routes on the different customer site CE routers.
What is wrong with this configuration that is causing the problem?

• A. The router eigrp command is referencing the wrong AS number.
• B. The redistribute eigrp command is missing the metric transparent option.
• C. The redistribute eigrp command is referencing the wrong AS number.
• D. The redistribute bgp command is missing the subnets option.
• E. The redistribute eigrp command is missing the subnets option.

Answer: C

NEW QUESTION 14
Which organization provides and promotes a standards-based description of service provider services offering?

• A. MEF
• B. IETF
• C. IEEE
• D. ITU

Answer: A

NEW QUESTION 15
Which option represents an AToM pseudowire basic configuration in Cisco IOS XR device?

• A. pseudowire-class name_class encapsulation mpls!
• B. pseudowire-class name_class encapsulation l2tpv3!
• C. l2vpn pw-class name encapsulation mpls!
• D. l2vpn xconnect group group-name p2p xconnect-name
• E. neighbor ip-address pw-id pseudowire-id

Answer: C

NEW QUESTION 16
An engineer is configuring VPLS BGP-based autodiscovery on a Cisco IOS XE PE router. Which two configurations must be included for proper implementation? {Choose two.}

• A. router bgp 61000neighbor 172.16.10.2 remote-as 61000
• B. router bgp 61000address-family l2vpn vpls send-community extended
• C. router bgp 61000neighbor 172.16.10.2 remote-as 62000
• D. router bgp 61000address-family l2vpn vpls send-community-eBGP
• E. l2vpn vfi context vpls1 autodiscovery bgp signaling ldp router bgp 61000neighbor 172.16.10.2 remote-as 62000
• F. l2vpn vfi context vpls1 autodiscovery bgp signaling ldp router bgp 61000neighbor 172.16.10.2 remote-as 61000

Answer: AB

NEW QUESTION 17
Refer to the exhibit.

PE1 and PE2 are advertising the same subnet 10.10.10.0/24 and export route-target to PE3. Which PE advertised subnet is installed at the PE3 BGP table?

• A. PE1 subnet only, due to higher BGP assigned weight.
• B. PE2 subnet only because it is a member in the same VRF.
• C. PE1 and PE2 subnets
• D. PE1 and PE2 subnets as 300:300:10.10.10.0/24

Answer: C

NEW QUESTION 18
A service provider wants to scale MAC address advertisements in its next generation E-LAN and E-TREE designs. Which technology can be used in the service provider cloud to reach this goal?

• A. PBB EVPN
• B. VPLS
• C. 802.1Q
• D. 802.3ad

Answer: A

NEW QUESTION 19
A network engineer working for a very large financial institution must migrate the legacy Frame Relay and ATM virtual circuits over a MPLS VPN solution. Which option is a benefit in choosing a MPLS Layer 3 VPN versus any other Layer 2 VPN design?

• A. An MPLS Layer 3 VPN design offers better scalability for large organizations.
• B. An MPLS Layer 3 VPN design requires less customer edge router configuration than any other Layer 2 VPN implementation.
• C. An MPLS Layer 3 VPN solution provides the possibility to implement overlapping IP addressing.
• D. An MPLS Layer 3 VPN design requires less provider edge router configuration than any other Layer 2 VPN implementation.

Answer: A

NEW QUESTION 20
DRAG DROP

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
Business subscribers are an important segment of many service providers' customer base. The main business services that must be provided by the network today are:
• MPLS VPN
• Carrier Ethernet connectivity
• Managed services
Carrier Ethernet connectivity services have been defined by the Metro Ethernet Forum {MEF} to include ELine, E-LAN, and E-Tree service types, which are defined as follows:
• 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.
• E-LAN is based on a multipoint-to-multipoint Ethernet Virtual Connection. Service multiplexing {more than one Ethernet Virtual Circuit at the same UNI} is permitted, as is the rich set of performance assurances defined by the MEF such as CIR with an associated Committed Burst Size {CBS} and Excess Information Rate {EIR}.
• E-Tree is a point-to-multipoint ELAN service in which the spoke "leaves" can communicate with the hub or "root" location but not with each other. Typical application for E-Tree is in franchise operations.

NEW QUESTION 21
What happens if the destination MAC address is not present in the table for the packets that are received on one of the ACs in VPLS?

• A. Packets are switched only to the PW.
• B. Packets are flooded only to the other local ACs.
• C. Packets are flooded on all other ACs and on all PWs that are associated with the bridge domain.
• D. Packets are dropped.

Answer: C

NEW QUESTION 22
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

Explanation:

NEW QUESTION 23
In MPLS Layer 3 VPN implementations, what is used on the PE router to isolate potential overlapping routing information between different customers?

• A. route targets
• B. VRFs
• C. VC IDs
• D. pseudowire IDs
• E. pseudowire classes

Answer: B

NEW QUESTION 24
Refer to the partial Cisco IOS XR PE router VRF configuration exhibit.

To implement a central-service VPN supporting both customer1 and customer2, what will be the required corresponding VRF configuration on the central-service-server PE router?

• A. vrf central-service-server address-family ipv4 unicast import route-target3:12:2export route-target 3:12:1!
• B. vrf central-service-server address-family ipv4 unicast import route-target3:12:1export route-target 3:12:2!
• C. vrf central-service-server address-family ipv4 unicast import route-target3:11:11:2export route-target 3:11:11:2!
• D. vrf central-service-server address-family ipv4 unicastimport route-target 3:11:11:22:12:2export route-target 3:11:11:22:12:2!

Answer: A

NEW QUESTION 25
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 26
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