Cisco 640-878 Brain Dumps Study Guide

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Question No. 1

Which IP addresses are matched by the permit 192.168.80.64 0.0.0.15 access-list entry?

Answer: E

Question No. 2

Refer to the exhibit.

Which three statements about MPLS LDP operations are true?

Answer: A, C, F

Question No. 3

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

Answer: A

Question No. 4

Which two statements about carrier-grade NAT are true? (Choose two.)

Answer: A, B

http://www.cisco.com/en/US/docs/routers/crs/software/crs_r3.9.1/cg_nat/configuration/guide/cgc391cgn.html#wp1268988

Carrier Grade NAT Overview

Carrier Grade Network Address Translation (CGN) is a large scale NAT that is capable of providing private IPv4 to public IPv4 translation in the order of millions of translations to support several hundred thousand subscribers and bandwidth throughput of at least 10 Gbps full-duplex.

CGN is a workable solution to the IPv4 address depletion problem while offering a way for service provider subscribers and content providers to implement a graceful transition to IPv6. CGN employs network address and port translation (NAPT) methods to aggregate many private IP addresses into fewer public IPv4 addresses. For example, a single public IPv4 address with a pool of 32 K port numbers supports 320 individual private IP subscribers assuming each subscriber requires 100 ports (for example, each TCP connection needs one port number).

A CGN requires IPv6 to assist with the transition from IPv4 to IPv6.

Question No. 5

A customer has created a new VLAN for the subnet that was allocated to them. Computers on the subnets can ping their default gateway, but they cannot ping devices in the other subnet. What is most likely the problem?

Answer: B

Question No. 6

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

Answer: A, B, D

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Related Certification: CCNA Service Provider dumps