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CCIE Routing and Switching Written Exam v5.1

QUESTION 351

Refer to the exhibit. When the link between RtrB and RtrC goes down, multicast receivers stop receiving traffic from the source for multicast group 229.1.1.1.Which solution will resolve this?

 

clip_image002

 

A.

adding a static mroute on RtrB and RtrF

B.

adding a static unicast route on RtrB and RtrF

C.

creating a GRE tunnel between RtrB and RtrD

D.

enabling PIM sparse mode on both ends of the link between RtrB and RtrF

 

Correct Answer: D

Explanation:

For multicast traffic to flow, PIM must be enabled on all routers in the path of the multicast stream.

 

 

QUESTION 352

DRAG DROP

clip_image004

 

Correct Answer:

clip_image006

 

 

QUESTION 353

Which three statements about bridge assurance are true? (Choose three.)

 

A.

Bridge assurance must be enabled on both ends of a link.

B.

Bridge assurance can be enabled on one end of a link or on both ends.

C.

Bridge assurance is enabled on STP point-to-point links only.

D.

Bridge assurance is enabled on STP multipoint links only.

E.

If a bridge assurance port fails to receive a BPDU after a timeout, the port is put into a blocking state.

F.

If a bridge assurance port fails to receive a BPDU after a timeout, the port is put into an error disabled state.

 

Correct Answer: ACE

Explanation:

Bridge Assurance is enabled by default and can only be disabled globally. Also, Bridge Assurance can be enabled only on spanning tree network ports that are point-to-point links. Finally, both ends of the link must have Bridge Assurance enabled.

With Bridge Assurance enabled, BPDUs are sent out on all operational network ports, including alternate and backup ports, for each hello time period. If the port does not receive a BPDU for a specified period, the port moves into the blocking state and is not used in the root port calculation. Once that port receives a BPDU, it resumes the normal spanning tree transitions.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/CLIConfigurationGuide/SpanningEnhanced.html

QUESTION 354

Which three types of traffic are allowed by IEEE 802.1X access control prior to getting authenticated? (Choose three.)

 

A.

EAPOL

B.

VTP

C.

STP

D.

ARP

E.

CDP

F.

HTTP

 

Correct Answer: ACE

Explanation:

Until the client is authenticated, IEEE 802.1x access control allows only Extensible Authentication Protocol over LAN (EAPOL), Cisco Discovery Protocol (CDP), and Spanning Tree Protocol (STP) traffic through the port to which the client is connected. After authentication, normal traffic passes through the port.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/15-0_2_se/configuration/guide/scg3750/sw8021x.pdf

 

 

QUESTION 355

Which regular expression will match prefixes from the AS 200 that is directly connected to our AS?

 

A.

^$

B.

^200)

C.

_200$

D.

_200_

E.

^200_

 

Correct Answer: E

Explanation:

Table 2 Commonly Used Regular Expressions

Expression

Meaning

*

Anything

^$

Locally originated routes

^100_

Learned from autonomous system 100

_100$

Originated in autonomous system 100

_100_

Any instance of autonomous system 100

^[0-9]+$

Directly connected autonomous system paths

Reference: http://www.cisco.com/c/en/us/td/docs/ios/termserv/configuration/guide/12_4t/tsv_12_4t_book/tsv_reg_express.html

 

 

 

QUESTION 356

Refer to the exhibit. ASN 64523 has a multihomed BGP setup to ISP A and ISP B. Which BGP attribute can you set to allow traffic that originates in ASN 64523 to exit the ASN through ISP B?

 

clip_image007

 

A.

origin

B.

next-hop

C.

weight

D.

multi-exit discriminator

 

Correct Answer: D

Explanation:

MED is an optional nontransitive attribute. MED is a hint to external neighbors about the preferred path into an autonomous system (AS) that has multiple entry points. The MED is also known as the external metric of a route. A lower MED value is preferred over a higher value.

Example at reference link below:

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13759-37.html

 

 

QUESTION 357

DRAG DROP

clip_image009

 

Correct Answer:

clip_image011

 

 

QUESTION 358

For which three routing protocols can Cisco PfR provide direct route control? (Choose three.)

 

A.

OSPF

B.

ISIS

C.

BGP

D.

EIGRP

E.

static routing

F.

ODR

 

Correct Answer: CDE

Explanation:

Q. Can you elaborate more on the Parent Route and why it’s so important to PfR?

A. Yes. For any route that PfR modifies or controls (BGP, Static, PIRO, EIGRP, PBR), having a Parent prefix in the routing table eliminates the possibility of a routing loop occurring. This is naturally a good thing to prevent in routed networks.

Reference: http://docwiki.cisco.com/wiki/Performance_Routing_FAQs#Route_Control

 

 

QUESTION 359

Refer to the exhibit. Which two statements about this route table are true? (Choose two.)

 

clip_image012

 

A.

The BGP routes are internal.

B.

The OSPF routes with the E2 flag retain the same metric as they leave the router.

C.

The OSPF routes with the IA flag have their administrative distances incremented as they leave the router.

D.

The BGP routes are external.

E.

The OSPF routes with the E2 flag have their metrics incremented as they leave the router.

 

Correct Answer: AB

Explanation:

IBGP routes have an Administrative distance of 200, while EBGP have an AD of 20. Here we see that the BGP routes have an AD value of 200.

With OSPF, external routes fall under two categories, external type 1 and external type 2. The difference between the two is in the way the cost (metric) of the route is being calculated. The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route. A type 1 cost is the addition of the external cost and the internal cost used to reach that route. The metric for E2 routes do not change when advertising to other routers.

 

 

QUESTION 360

Refer to the exhibit. Which additional information must you specify in this configuration to capture NetFlow traffic?

 

clip_image013

 

A.

ingress or egress traffic

B.

the number of cache entries

C.

the flow cache active timeout

D.

the flow cache inactive timeout

 

Correct Answer: A

Explanation:

Configuring NetFlow

Perform the following task to enable NetFlow on an interface.

SUMMARY STEPS

 

1. enable

2. configure terminal

3. interface type number

4. ip flow {ingress | egress}

5. exit

6. Repeat Steps 3 through 5 to enable NetFlow on other interfaces.

7. end

 

DETAILED STEPS

 

Command or Action

Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

interface type number

Example:

Router(config)# interface ethernet 0/0

Specifies the interface that you want to enable NetFlow on and enters interface configuration mode.

Step 4

ip flow {ingress | egress}

Example:

Router(config-if)# ip flow ingress

Enables NetFlow on the interface.

ingress–Captures traffic that is being received by the interface

egress–Captures traffic that is being transmitted by the interface

Step 5

exit

Example:

(Optional) Exits interface configuration mode and enters global configuration mode.

Note

You need to use this command only if you want to enable NetFlow on another interface.

Step 6

Repeat Steps 3 through 5 to enable NetFlow on other interfaces.

This step is optional.

Step 7

end

Example:

Router(config-if)# end

Exits the current configuration mode and returns to privileged EXEC mod

 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/netflow/configuration/guide/12_2sr/nf_12_2sr_book/cfg_nflow_data_expt.html

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