[Free] 2018(Aug) Ensurepass Cisco 640-878 Dumps with VCE and PDF 11-20

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Building Cisco Service Provider Next-Generation Networks, Part 2

Question No: 11

A customer has installed a second router and copied the configuration from the first router, as shown below. What change is needed to ensure that router 1 is the primary IP address?

Router 1

standby 1 priority 110

standby 1 preempt

Router 2

standby 1 priority 120

standby 1 preempt

  1. decrease the priority on router 2 to 109

  2. decrease the priority on router 1 to 109

  3. remove standby 1 preempt from router 1

  4. increase the priority on router 2 to 130

  5. increase the priority on router 1 to 119

Answer: A

Question No: 12

The permit access-list entry permits exactly which IP address range?

A. to

B. to

C. to

D. to

E. to

F. to

Answer: A

Question No: 13

Your switch network has been configured to support multiple VLANs. In order for the users on one VLAN to communicate with users on another VLAN, which additional configuration is required?

  1. Enable a routing protocol like EIGRP on a router or on a Layer 3 capable switch

  2. Enable inter-VLAN routing on a router or on a Layer 3 capable switch

  3. Enable a switch virtual interface on the router, using the interface vlan global configuration command

  4. Enable a switch virtual interface on the switch, using the encapsulation dot1q

  5. subinterface configuration command

  6. Enable IP routing on a Layer 2 switch

Answer: B

Question No: 14

Refer to the topology diagram in the exhibit.

Which two interface configuration commands on the Cisco ME 3400-1 switch Fa 0/1 interface are required to support the VLANs for Customer A to be trunked across the service provider network? (Choose two.)

  1. switchport access vlan 30

  2. switchport mode trunk

  3. switchport mode dot1q-tunnel

  4. switchport trunk allowed vlan 1-100

Answer: A,C

Explanation: Explanation/Reference: http://www.cisco.com/en/US/docs/switches/metro/me3400/software/release/12.2_25_ex/co nfiguration/guide/swtunnel.html

Question No: 15

Refer to the exhibit.

A network engineer implemented these configurations. However, Intermediate System-to-

Intermediate System (IS-IS) neighbors are unable to establish. What is the reason for this error?

  1. missing router IS-IS x command

  2. missing IP router IS-IS command

  3. missing network mask

  4. missing network statement

  5. missing MTU matching value

Answer: B

Question No: 16

Which Cisco router platform supports running either the Cisco IOS or IOS XR operating system?

  1. Cisco CRS

  2. Cisco ASR9k

  3. Cisco ASR1K

  4. Cisco ISR-G2

  5. Cisco 12000 GSR

Answer: E

Explanation: Explanation/Reference:

The CRS-1 platform natively runs the IOS XR operating system. The c12000 platform, originally being an IOS router, can be upgraded to run IOS XR. However, c12000 hardware, including line cards (LC) as well as route processors (RP), must be checked for XR compliance.

TURBOBOOT refers to a fresh boot of the router from ROMMON. TURBOBOOT is required if an IOS router is being converted to IOS XR or as a last resort disaster recovery in the case of CRS-1. If the router is already running an IOS XR image, there is no need to TURBOBOOT the router for an upgrade or downgrade. Later sections in this chapter address the upgrade scenario. This section deals with a fresh boot of the router from ROMMON.

A new c12000 platform can be ordered prebaked as an IOS XR router; however, there will always be cases where an IOS running c12000 needs to install IOS XR.

Question No: 17

During the BGP route selection process on Cisco routers, which BGP attribute is examined first, to determine the best path to use?

  1. AS path

  2. MED

  3. local preference

  4. weight

  5. origin

Answer: D

Question No: 18

Which four statements about REP configurations on a Cisco ME 3400 switch port are true? (Choose four.)

  1. The port must be an NNI type and must be in trunk mode.

  2. Use the rep segment number command to enable REP on the switch port.

  3. A REP segment cannot be wrapped into a ring topology. REP supports only a topology where each REP segment has two exit points via two edge switches.

  4. The port where the segment terminates is called the edge port.

  5. With REP, at least one port is always blocked in any given segment-that is, the alternate port.

  6. If a failure occurs within the segment, the blocked port goes to the forwarding state after it goes through the listening state and the learning state.

Answer: A,B,D,E

Explanation: Explanation/Reference: http://www.cisco.com/en/US/docs/switches/metro/me3400/software/release/12.2_40_se/co nfiguration/guide/swrep.html

Resilient Ethernet Protocol (REP) on the Cisco ME 3400E Ethernet Access switch. REP is a Cisco proprietary protocol that provides an alternative to Spanning Tree

Protocol (STP) to control network loops, handle link failures, and improve convergence time. REP controls a group of ports connected in a segment, ensures that the segment does not create any bridging loops, and responds to link failures within the segment. REP provides a basis for constructing more complex networks and supports VLAN load balancing.

REP Configuration Guidelines

Follow these guidelines when configuring REP:

鈥e recommend that you begin by configuring one port and then configure the contiguous ports to minimize the number of segments and the number of blocked ports.

鈥f more than two ports in a segment fail when no external neighbors are configured, one port goes into a forwarding state for the data path to help maintain connectivity during configuration. In the show rep interface privileged EXEC command output, the Port Role for this port shows as Fail Logical Open; the Port Role for the other failed port shows as Fail No Ext Neighbor. When the external neighbors for the failed ports are configured, the ports go through the alternate port state transitions and eventually go to an open state or remain as the alternate port, based on the alternate port election mechanism.

鈥EP ports must be Layer 2 trunk ports.

鈥e careful when configuring REP through a Telnet connection. Because REP blocks all VLANs until another

REP interface sends a message to unblock it, you might lose connectivity to the switch if you enable REP in a Telnet session that accesses the switch through the same interface.

鈥ou cannot run REP and STP or REP and Flex Links on the same segment or interface.

鈥f you connect an STP network to the REP segment, be sure that the connection is at the segment edge. An STP connection that is not at the edge could cause a bridging loop because STP does not run on REP segments. All STP BPDUs are dropped at REP interfaces.

鈥ou must configure all trunk ports in the segment with the same set of allowed VLANs, or a misconfigurations occurs.鈥f REP is enabled on two ports on a switch, both ports must be either regular segment ports or edge ports.

REP ports follow these rules:

-If only one port on a switch is configured in a segment, the port should be an edge port.

-If two ports on a switch belong to the same segment, both ports must be edge ports or both ports must be regular segment ports.

-If two ports on a switch belong to the same segment and one is configured as an edge port and one as a regular segment port (a misconfiguration), the edge port is treated as a regular segment port.

鈥EP interfaces come up in a blocked state and remains in a blocked state until notified that it is safe to unblock. You need to be aware of this to avoid sudden connection losses.

鈥EP sends all LSL PDUs in untagged frames on the native VLAN. The BPA message sent to the Cisco multicast address is sent on the administration VLAN, which is VLAN 1 by default.

鈥EP ports can not be configured as one of these port types:

-SPAN destination port

-Private VLAN port

-Tunnel port

-Access port

鈥n a Cisco ME-3400 switch, REP ports must be network node interfaces (NNI). User- network interfaces

(UNIs) cannot be REP ports.

鈥EP is supported on EtherChannels, but not on an individual port that belongs to an EtherChannel.

鈥here is a maximum of 64 REP segments per switch.

Question No: 19

On Cisco IOS XR software, how is LDP enabled on an interface?

  1. LDP is automatically enabled globally on all interfaces, when ip cef is enabled globally.

  2. LDP is enabled on each interface, using the mpls ip interface configuration command.

  3. LDP is enabled on each interface, using the interface command under mpls ldp (MPLS LDP configuration mode).

  4. LDP is enabled globally on all interfaces, using the mpls ldp global configuration command.

  5. LDP is enabled globally on all interfaces, using the mpls ip global configuration command.

Answer: C

Explanation: Explanation/Reference:

http://www.cisco.com/en/US/docs/ios-xml/ios/mp_ldp/configuration/12-4m/mp-ldp-12-4m- book.pdf

Question No: 20

You have installed a new router and configured OSPF on it. However, this new router is not

able to establish an OSPF neighbor relationship with the neighbor OSPF router. Which four conditions could cause this problem? (Choose four.)

  1. mismatched OSPF hello/dead interval between the new router and the neighbor router

  2. mismatched OSPF area ID between the new router and the neighbor router

  3. mismatched OSPF authentication data between the new router and the neighbor router

  4. mismatched OSPF router ID between the new router and the neighbor router

  5. mismatched interface MTU between the new router and the neighbor router

  6. mismatched interface bandwidth between the new router and the neighbor router

Answer: A,B,C,E

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