[Free] 2018(Mar) EnsurePass Braindumps Cisco 640-878 Dumps with VCE and PDF 21-30

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Building Cisco Service Provider Next-Generation Networks, Part 2

Question No: 21

A network administrator is troubleshooting an issue whereupon they able to ping the web server, but unable to web browse to the same web server. When the administrator telnets to the webserver on port 80, the administrator gets a connection refused message. At which three layers of the OSI model does the problem exist? (Choose three.)

  1. Layer 1

  2. Layer 2

  3. Layer 3

  4. Layer 4

  5. Layer 5

  6. Layer 6

  7. Layer 7

Answer: D,E,G

Question No: 22

What are two legitimate IPv4 to IPv6 migration technologies? (Choose two.)

  1. Lift and shift

  2. Dual stack backbones

  3. In IPv4 / Out IPv6

  4. IPv6 over IPv4 tunneling

  5. IPv6 phasing

Answer: B,D

Question No: 23 DRAG DROP


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Question No: 24

You are enabling OSPF on a router and notice that all the Fast Ethernet and the Gigabit Ethernet interfaces have the same OSPF cost of 1. Which single configuration change can you make in router ospf configuration mode so that the Fast Ethernet interfaces have a higher OSPF cost than the Gigabit Ethernet interfaces?

  1. Change the OSPF interface cost globally.

  2. Change the OSPF default metric.

  3. Change the OSPF auto-cost reference bandwidth.

  4. Change the OSPF administrative distance.

  5. Change the OSPF metric type from E2 to E1.

Answer: C

Explanation: Explanation/Reference:


Question No: 25 HOTSPOT


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Question No: 26

Which three statements about access control lists on a Cisco IOS router are true? (Choose three)

  1. The more specific ACL entries should be placed at the top of the ACL.

  2. The generic ACL entries should be placed at the top of the ACL, to filter general traffic and reduce noise on the network.

  3. ACLs always search for the most specific entry before taking any filtering action.

  4. Router-generated packets cannot be filtered by the interface ACLs on the router.

  5. Extended ACLs should be placed as close to the destination as possible.

  6. There must be at least one permit statement in an ACL, or all traffic is denied.

Answer: A,D,F

Question No: 27

Refer to the partial Cisco IOS-XR configuration. What is the purpose of the for PFX to PEER command?


mpls ldp label advertise disable

for PFX to PEER

!lt;output omittedgt;


  1. To selectively enable LDP peering(s) with specific neighbors

  2. To selectively disable LDP peering(s) with specific neighbors

  3. To perform outbound filtering for local label advertisement for one or more prefixes to one or more peers

  4. To perform inbound filtering for local label advertisement for one or more prefixes from one or more peers

Answer: C

Question No: 28

What layer of the IP NGN Model does the Customer Element and the Carrier Ethernet exist?

  1. Service Layer

  2. Network Layer

  3. Application Layer

  4. Operational Layer

Answer: B

Question No: 29

Refer to the exhibit.

Which three commands are required on interface fastethernet 5/6 in order to create a trunk link between another Cisco Catalyst Switch? (Choose three.)

  1. no shutdown

  2. switchport mode trunk

  3. encapsulation trunk

  4. switchport trunk encapsulation dot1Q

  5. switchport trunk enable

  6. no switchport

  7. interface fastethernet 5/6 trunk

  8. switchport trunk allow dot1Q

Answer: A,B,D

Question No: 30

Which two protocols are most often deployed in Cisco IP NGN multiservices core networks to support services like VPNs? (Choose two.)

  1. MPLS

  2. GRE

  3. mGRE

  4. SSL

  5. VTI

  6. multiprotocol BGP

Answer: A,F

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