642-889 Latest Exam (Aug 2018)

[Free] 2018(Aug) Dumps4cert Cisco 642-889 Dumps with VCE and PDF Download 31-40

August 19, 2018

Dumps4cert.com : Latest Dumps with PDF and VCE Files
2018 Aug Cisco Official New Released 642-889
100% Free Download! 100% Pass Guaranteed!

Implementing Cisco Service Provider Next-Generation Egde Network Services

Question No: 31

In hierarchical VPLS implementations, which two access architectures can be used between the UPE and NPE? (Choose two.)

  1. EoMPLS

  2. MP-BGP

  3. Frame Relay

D. 802.1ad

Answer: A,D Explanation:

http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/12.2_5 2_ey/configuration/guide/swmpls.html#wp1244272

H-VPLS uses spoke connections, usually between Layer 2 switches acting as the CE and PE devices at the service provider#39;s point-of presence (POP). The spoke connections can be either an IEEE 802.1Q tagged connection or an MPLS LSP.

Question No: 32

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

  1. AToM

  2. Layer 3 VPN

  3. VPLS


Answer: A

Question No: 33

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?

  1. BGP AS override

  2. BGP allowas-in

  3. BGP SOO extended community

  4. BGP AS path prepending

Answer: A Explanation:


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

Question No: 34

When implementing H-VPLS with QinQ access on Cisco Metro Ethernet switches, which two commands enable the QinQ tagging? (Choose two.)

  1. encapsulation dot1q {customer-vlan} second-tag {sp-vlan}

  2. encapsulation dot1q {sp-vlan} second-tag {customer-vlan}

  3. switchport mode dot1q-tunnel

  4. switchport mode trunk

  5. switchport access vlan {sp-vlan}

  6. switchport access vlan {customer-vlan}

Answer: C,E

Question No: 35

Which two protocols can be used for VPLS signaling on a Cisco IOS XR router? (Choose two.)

  1. BGP

  2. LDP

  3. TDP

  4. RSVP

  5. PBB

Answer: A,B

Question No: 36

In Layer 3 MPLS VPN implementations, which protocol is used to carry the VPNv4 routes from PE to PE?

  1. RSVP

  2. IGP

  3. MP-BGP

  4. LDP

Answer: C

Question No: 37

When troubleshooting EoMPLS configuration problems, which three parameters must match between the two ends of the pseudowire configurations? (Choose three.)

  1. control word usage

  2. MTU size

  3. pseudowire ID

  4. Xconnect group name

  5. EFP subinterface number

Answer: A,B,C Explanation:

Provisioning an AToM Static Pseudowire

In this configuration task, you use options in the xconnect Ethernet interface configuration command to specify a static connection, and mpls commands in xconnect mode to

statically set the following pseudowire parameters:

鈥et the local and remote pseudowire labels

鈥nable or disable sending the MPLS control word

Dumps4Cert 2018 PDF and VCE

Dumps4Cert 2018 PDF and VCE

Haven#39;t been able to find where MTU Must match

Question No: 38

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

  1. route targets

  2. VRFs

  3. VC IDs

  4. pseudowire IDs

  5. pseudowire classes

Answer: B

Question No: 39

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?

  1. An MPLS Layer 3 VPN design offers better scalability for large organizations.

  2. An MPLS Layer 3 VPN design requires less customer edge router configuration than any other Layer 2 VPN implementation.

  3. An MPLS Layer 3 VPN solution provides the possibility to implement overlapping IP addressing.

  4. An MPLS Layer 3 VPN design requires less provider edge router configuration than any other Layer 2 VPN implementation.

Answer: A

Question No: 40

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?

  1. local preference

  2. weight

  3. MED

  4. extended community

Answer: C Explanation:


Use the red bgp lt;asngt; 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.

100% Dumps4cert Free Download!
642-889 PDF
100% Dumps4cert Pass Guaranteed!
642-889 Dumps

Dumps4cert ExamCollection Testking
Lowest Price Guarantee Yes No No
Up-to-Dated Yes No No
Real Questions Yes No No
Explanation Yes No No
Free VCE Simulator Yes No No
Instant Download Yes No No