Ensurepass

QUESTION 21

When implementing IP SLA icmp-echo probes on Cisco IOS-XE routers, which two options are available for IPv6? (Choose two.)

 

A.

flow-label

B.

hop-limit

C.

DSCP

D.

traffic-class

E.

TOS

 

Correct Answer: AD

 

 

QUESTION 22

When verifying multicast configurations and operations on Cisco IOS-XR routers, which two statements regarding show commands are correct? (Choose two.)

 

A.

Use the show route ipv4 multicast command to display the incoming and outgoing interface lists for each of the joined multicast groups

B.

Use the show pim rpf command to display the RPF information for the RP or for the multicast source

C.

Use the show mrib route command to display the (*, G) and (S, G) states information on the router

D.

Use the show mrib route command to display the configured static multicast routes

 

Correct Answer: BC

 

 

QUESTION 23

A network engineer of an ISP using Cisco IOS XR routers wants to limit the number of prefixes that BGP peers can accept. To accomplish this task, the command maximum- prefix 1000 is used. Which two results of this configuration are expected? (Choose two.)

 

A.

A warning message displays by default when 750 prefixes are received.

B.

A warning message displays by default when 850 prefixes are received.

C.

A BGP peer resets when it receives 1001 prefixes.

D.

A BGP peer resets when it receives 1000 prefixes.

E.

A BGP peer ceases when it receives 1001 prefixes.

F.

A BGP peer ceases when it receives 1000 prefixes.

G.

The BGP peer tries to reestablish the session after one minute.

 

Correct Answer: AE

 

 

QUESTION 24

What is determined by running the same hash algorithm on all PIMv2 routers?

 

A.

The SPT from the RP to the multicast source

B.

The SPT from the last hop router to the multicast source

C.

Auto RP election

D.

Which BSR to use for a particular multicast group

E.

Which RP to use from a set of candidate RPs in the RP set

 

Correct Answer: E

QUESTION 25

Which of the following can be used by dual-stack service providers supporting IPv4/IPv6 customers with dual-stack hosts using public IPv6 addresses and private IPv4 addresses?

 

A.

NAT64

B.

6RD

C.

6to4 tunnels

D.

Carrier-grade NAT

 

Correct Answer: D

Explanation:

Carrier Grade NAT is a large-scale NAT, capable of providing private-IPv4-to-public-IPv4 translation in the order of millions of translations. Carrier Grade NAT can support several hundred thousand subscribers with the bandwidth throughput of at least 10Gb/s full-duplex. With IPv4 addresses reaching depletion, Carrier Grade NAT is vital in providing private IPv4 connectivity to the public IPv4 internet. In addition, Carrier Grade NAT is not limited to IPv4 NAT; it can also translate between IPv4 and IPv6 addresses.

 

 

QUESTION 26

Refer to the exhibit. Which three statements are correct regarding the Cisco IOS-XR configuration? (Choose three.)

 

clip_image002

 

A.

This router, acting as the RP mapping agent, will send RP announcement messages to the 224.0.1.40 group

B.

This router, acting as the RP mapping agent, will send RP discovery messages to the 224.0.1.39 group

C.

This router is the RP mapping agent only for the 224.11.11.11 and 224.99.99.99 multicast groups

D.

This router is a candidate PIM-SM RP for the 224.99.99.99 multicast group

E.

This router is a candidate PIM-BIDIR RP for the 224.11.11.11 multicast group

F.

IGMPv3 is enabled on all interfaces

G.

Other routers will recognize this router as the RP for all multicast groups with this router loopback 0 IP address

 

Correct Answer: DEF

 

 

QUESTION 27

Refer to the exhibit. XR4 must protect itself from a DOS attack against its BGP pro
cess from R1 by using the TTL security feature. Which configuration achieves this goal?

 

clip_image004

 

A.

router bgp 100

neighbor 10.10.14.1 ttl-security

B.

router bgp 100

neighbor 10.10.14.1 ttl-security hops 1

C.

router bgp 100

neighbor 10.10.14.1 ttl-security hops 254

D.

router bgp 100

neighbor 10.10.14.1 ttl-security hops 255

 

Correct Answer: A

 

 

QUESTION 28

Each router (RTA, RTB, and RTC) has one iBGP adjacency with the route reflector router RTD. Router RTC has an iBGP route advertised by RTA, but the same route is missing from RTB. Thenetwork engineer verifies that route filtering does not deny the route advertisement. Which action corrects the problem?

 

A.

RTD(config-router)#neighbor 192.168.1.1 route-reflector-client

RTD(config-router)#neighbor 192.168.1.1 description RTA

RTD(config-router)#neighbor 192.168.1.2 route-reflector-client

RTD(config-router)#neighbor 192.168.1.2 description RTB

B.

RTC(config-router)#neighbor 192.168.1.4 route-reflector-client

RTC(config-router)#neighbor 192.168.1.4 description RTD

C.

RTA(config-router)#neighbor 192.168.1.4 route-reflector-client

RTA(config-router)#neighbor 192.168.1.4 description RTD

RTB(config-router)#neighbor 192.168.1.4 route-reflector-client

RTB(config-router)#neighbor 192.168.1.4 description RTD

D.

RTB(config-router)#neighbor 192.168.1.3 route-reflector-client

RTB(config-router)#neighbor 192.168.1.3 description RTC

E.

RTB(config-router)#neighbor 192.168.1.3 route-reflector-client

RTB(config-router)#bgp cluster-id 192.168.1.2

RTB(config-router)#no bgp client-to-client reflection

Correct Answer: A

 

 

QUESTION 29

Which informationdoes the multicast supported router need to forward the multicast traffic over the source or shared tree?

 

A.

source address

B.

multicast address

C.

destination address

D.

mGRE headers

E.

MDT Data

 

Correct Answer: C

 

 

QUESTION 30

Which IPv6 mechanism occurs between a provider edge router and the customer premises equipment router to allow an ISP to automate the process of assigning a block of IPv6 addresses to a customer for use within the customer network?

 

A.

Router Advertisement

B.

DHCPv6 Prefix Delegation

C.

DHCPv6 Lite

D.

Stateful DHCPv6

 

Correct Answer: B

Explanation:

http://www.cisco.com/en/US/tech/tk872/technologies_configuration_example09186a0080b 8a116.shtml

 

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