2016NEW Cisco.CCIE.(400-101)EXAM] CCIE Routing and Switching EXAM A PART13 (281-300) VCE DUMPS FOR FREE DOWNLOAD WITH 100%PASS ENSURE

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QUESTION 281

Which BGP feature enables you to install a backup path in the forwarding table?

A. soft reconfiguration

B. prefix independent convergence

C. route refresh

D. synchronization

Correct Answer: B

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

To install a backup path into the forwarding table and provide prefix independent convergence (PIC) in case of a PE-CE link failure, use the additional-paths install

backup command in an appropriate address family configuration mode. To prevent installing the backup path, use the no form of this command. To disable prefix

independent convergence, use the disable keyword.

Reference. http://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4- 2/routing/command/reference/b_routing_cr42crs/b_routing_cr42crs_chapter_01.html

QUESTION 282

Refer to the exhibit.R1 and R2 have a working VRF-Lite configuration, but R1 is receiving a route only to 10.2.2.2 from R2. Which two changes can you make so that R1 receives all

routes from R2? (Choose two.)A. Create an additional permit statement in the access list that is referenced by the import-map on R1.

B. Disable VRF filtering on R1.

C. Set the R1 and R2 OSPF process IDs to match.

D. Change the wildcard mask for the network 10.3.3.0 to 0.0.0.0.

E. Create a matching export map in the VRF for R2.

Correct Answer: AB

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

The access list in this example is only allowing the 192.168.0.0/16 and 10.2.2.2/32 routes to be advertised, so an additional permit statement is needed to allow

the other routes. Alternatively, we could simply disable VRF filtering, then all routes would be advertised.

QUESTION 283

Refer to the exhibit.R2 is unable to access the 172.16.1.0/30 network between R1 and R3. Which option is a possible reason for the failure?

A. The seed metric for redistributing into RIP on R3 is missing.

B. The OSPF processes on R2 and R3 are different.

C. Auto-summary is misconfigured under the RIP process of R3.

D. The subnet mask on the link between R2 and R3 is smaller than /30.E. The wildcard mask on R3 is misconfigured.

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

The problem is that RIP requires a seed metric to be specified when redistributing routes into that protocol. A seed metric is a "starter metric" that gives the RIP

process a metric it can work with. The OSPF metric of cost is incomprehensible to RIP, since RIP’s sole metric is hop count.

Reference. http://www.thebryantadvantage.com/CCNP%20Certification%20BSCI%20Exam %20Tutorial%20Route%20Redistribution%20Seed%20Metric.htm

QUESTION 284

DRAG DROP

Drag and drop the BGP attribute on the left to the correct category on the right.

Select and Place:

Correct Answer:Section: Layer 3 Technologies

Explanation

Explanation/Reference:

QUESTION 285

DRAG DROP

Drag and drop the RIP configuration command on the left to the function it performs on the right.

Select and Place:

Explanation/Reference:

QUESTION 286

DRAG DROP

Drag and drop each EIGRP element on the left to the corresponding definition on the right.

Select and Place:

Correct Answer:

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

QUESTION 287

DRAG DROP

Drag and drop each BGP attribute on the left to the matching description on the right.

Select and Place:

Correct Answer:

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

QUESTION 288

Which option describes the effect of the OSPF default-information originate always command?

A. It creates a stub area.B. It configures the device to advertise a default route regardless of whether it exists in the routing table.

C. It configures the device to automatically redistribute a default route.

D. It adds a static default route to the device configuration.

Correct Answer: B

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

default-information originate

To generate a default external route into an Open Shortest Path First (OSPF) routing domain, use the default-information originate command in router

configuration mode. To disable this feature, use the no form of this command.

default-information originate [always] metric metric-value [ metric-type type-value ] [ route- map map-name ]

Syntax Description

Reference. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/command/ipv6-cr-book/ipv6- d2.html

QUESTION 289

Which two options are reasons to manipulate the delay metric instead of the bandwidth metric for EIGRP routing? (Choose two.)

A. Because the delay metric provides better handling for bursty traffic

B. Because manipulating the bandwidth metric can also affect QoS

C. Because manipulating the bandwidth affects only a particular path

D. Because changes to the delay metric are propagated to all neighbors on a segment

Correct Answer: BD

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Using the bandwidth to influence EIGRP paths is discouraged for two reasons:

Changing the bandwidth can have impact beyond affecting the EIGRP metrics. For example, quality of service (QoS) also looks at the bandwidth on aninterface.

EIGRP throttles to use 50 percent of the configured bandwidth. Lowering the bandwidth can cause problems like staving EIGRP neighbors from getting hello

packets because of the throttling back.

Because changes to the delay metric are propagated to all downstream routers, changing the interface delay parameter is the preferred method of influencing path

selection

Reference. http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing- protocol-eigrp/13673-14.html

QUESTION 290

What is the maximum number of secondary IP addresses that can be configured on a router interface?

A. 1

B. 2

C. 4

D. 1024

E. 65535

F. no limit to the number of addresses

Correct Answer: F

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

From "IP Routing Frequently Asked Questions"

Q. What are the maximum number of secondary IP addesses that can be configured on a router interface?

A. There are no limits on configuring secondary IP addresses on a router interface.

Reference. http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/28745- 44.html#q21

QUESTION 291

Which address is a MAC address that is mapped from an IPv6 address (RFC 2464)?

A. 3333.FF17.FC0F

B. FFFE. FF17.FC0F

C. FF34.3333.FF17

D. FF7E.FF17.FC0FCorrect Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

An IPv6 packet with a multicast destination address DST, consisting of the sixteen octets DST through DST, is transmitted to the Ethernet multicast address

whose first two octets are the value 3333 hexadecimal and whose last four octets are the last four octets of DST.

Reference. https://tools.ietf.org/html/rfc2464

QUESTION 292

Which multicast protocol uses source trees and RPF?

A. DVMRP

B. PIM sparse mode

C. CBT

D. mOSPF

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

DVMRP builds a parent-child database using a constrained multicast model to build a forwarding tree rooted at the source of the multicast packets. Multicast

packets are initially flooded down this source tree. If redundant paths are on the source tree, packets are not forwarded along those paths. Forwarding occurs until

prune messages are received on those parent-child links, which further constrains the broadcast of multicast packets.

Reference. DVMRP and dense-mode PIM use only source trees and use RPF as previously described.

Reference. http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3550/software/release/12- 1_19_ea1/configuration/guide/3550scg/swmcast.html

QUESTION 293

What is the function of the command ip pim autorp listener?

A. It allows a border PIM sparse mode router to accept autorp information from another autonomous system.

B. It allows the mapping agents to accept autorp information from the PIM rendezvous point.

C. It allows the routers to flood the autorp information in a sparse-mode-only network.

D. It allows a BSR to accept autorp information and translate it into BSR messages.Correct Answer: C

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

To cause IP multicast traffic for the two Auto-RP groups 224.0.1.39 and 224.0.1.40 to be Protocol Independent Multicast (PIM) dense mode flooded across

interfaces operating in PIM sparse mode, use the ip pim autorp listener command in global configuration mode. To disable this feature, use the no form of this

command.

Reference. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti/command/imc-cr- book/imc_i3.html#wp3085748429

QUESTION 294

Refer to the exhibit.

Which statement is true about why the first-hop PIM IPv6 router is stuck in registering?

A. The scope of the IPv6 multicast address is link-local.

B. The outgoing interface for the IPv6 multicast group should not be a tunnel interface.

C. The R-bit is set in the IPv6 address, but this is not an embedded RP multicast IPv6 address.

D. The S flag should not be set on a first-hop PIM router.

E. A multicast IPv6 address does not start with FF.

Correct Answer: C

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

·R bit: RP bit: R = 1 indicates the address embeds the address of the Rendezvous Point (RP). The embedded RP address needs to begin with the prefixFF70::/12, But here we see that the address is FF7E::1234.

QUESTION 295

Refer to the exhibit.Which option is the result of this configuration?

A. All SNMP traffic coming into the router is redirected to interface GigabitEthernet1/0.

B. All SNMP traffic generated from the router is redirected to interface GigabitEthernet1/0.

C. All SMTP traffic generated from the router is redirected to interface GigabitEthernet1/0.

D. All POP3 traffic coming into the router is redirected to interface GigabitEthernet1/0.

E. All SMTP traffic coming into the router is redirected to interface GigabitEthernet1/0.

Correct Answer: C

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

This is an example of policy based routing, where traffic sourced from this router that matches the access list (all traffic with port 25 which is SMTP) will be forced

out the Gig 0/1 interface.

QUESTION 296

Which three statements about EIGRP and BFD are true? (Choose three.)A. BFD is independent of the routing protocol, so it can be used as a generic failure detection mechanism for EIGRP.

B. Some parts of BFD can be distributed to the data plane, so it can be less CPU-intensive than reduced timers, which exist wholly at the control plane.

C. Reduced EIGRP timers have an absolute minimum detection timer of 1-2 seconds; BFD can provide sub-second failure detection.

D. BFD is tied to specific routing protocols and can be used for generic fault detection for the OSPF, EIGRP, and BGP routing protocols.

E. BFD is dependent on the EIGRP routing protocol, so it can be used as a specific failure detection mechanism.

F. BFD resides on the control plane, so it is less CPU-intensive than if it resided on the data plane.

Correct Answer: ABC

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

There are several advantages to implementing BFD over reduced timer mechanisms for routing protocols:

· Although reducing the EIGRP, IS-IS, and OSPF timers can result in minimum detection timer of one to two seconds, BFD can provide failure detection in less

than one second.

· Because BFD is not tied to any particular routing protocol, it can be used as a generic and consistent failure detection mechanism for EIGRP, IS-IS, and

OSPF.

· Because some parts of BFD can be distributed to the data plane, it can be less CPU-intensive than the reduced EIGRP, IS-IS, and OSPF timers, which exist

wholly at the control plane.

Reference. http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html

QUESTION 297

You are implementing new addressing with EIGRP routing and must use secondary addresses, which are missing from the routing table. Which action is the most

efficient solution to the problem?

A. Disable split-horizon on the interfaces with secondary addresses.

B. Disable split-horizon inside the EIGRP process on the router with the secondary interface addresses.

C. Add additional router interfaces and move the secondary addresses to the new interfaces.

D. Use a different routing protocol and redistribute the routes between EIGRP and the new protocol.

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:Normally, routers that are connected to broadcast-type IP networks and that use distance-vector routing protocols employ the split horizon mechanism to reduce

the possibility of routing loops. Split horizon blocks information about routes from being advertised by a router out of any interface from which that information

originated. This behavior usually optimizes communications among multiple routers, particularly when links are broken. However, with nonbroadcast networks,

situations can arise for which this behavior is less than ideal. For these situations, you might want to disable split horizon with EIGRP and RIP.

If an interface is configured with secondary IP addresses and split horizon is enabled, updates might not be sourced by every secondary address. One routing

update is sourced per network number unless split horizon is disabled.

Reference. http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfrip.html

QUESTION 298

Refer to the exhibit.

Which two options are possible states for the interface configured with the given OSPFv3 authentication? (Choose two.)

A. GOING UP

B. DOWN

C. UNCONFIGURED

D. GOING DOWN

Correct Answer: AB

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

To configure IPsec, you configure a security policy, which is a combination of the security policy index (SPI) and the key (the key is used to create and validate the

hash value). IPsec for OSPFv3 can be configured on an interface or on an OSPFv3 area. For higher security, you should configure a different policy on each

interface configured with IPsec. If you configure IPsec for an OSPFv3 area, the policy is applied to all of the interfaces in that area, except for the interfaces that

have IPsec configured directly. Once IPsec is configured for OSPFv3, IPsec is invisible to you.

The secure socket API is used by applications to secure traffic. The API needs to allow the application to open, listen, and close secure sockets. The binding

between the application and the secure socket layer also allows the secure socket layer to inform the application of changes to the socket, such as connection

open and close events. The secure socket API is able to identify the socket; that is, it can identify the local and remote addresses, masks, ports, and protocol that

carry the traffic requiring security.

Each interface has a secure socket state, which can be one of the following:

NULL: Do not create a secure socket for the interface if authentication is configured for the area.

DOWN: IPsec has been configured for the interface (or the area that contains the interface), but OSPFv3 either has not requested IPsec to create a securesocket for this interface, or there is an error condition.

GOING UP: OSPFv3 has requested a secure socket from IPsec and is waiting for a CRYPTO_SS_SOCKET_UP message from IPsec.

UP: OSPFv3 has received a CRYPTO_SS_SOCKET_UP message from IPsec.

CLOSING: The secure socket for the interface has been closed. A new socket may be opened for the interface, in which case the current secure socket makes

the transition to the DOWN state. Otherwise, the interface will become UNCONFIGURED.

UNCONFIGURED. Authentication is not configured on the interface.

OSPFv3 will not send or accept packets while in the DOWN state.

ReferenE. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-sy/iro- 15-sy-book/ip6-route-ospfv3-auth-ipsec.html

QUESTION 299

Refer to the exhibit.

The device with this configuration is unable to reach network 172.31.31.0/24. The next hop router has been verified to have full connectivity to the network. Which

two actions can you take to establish connectivity to the network? (Choose two.)

A. Create a static route to 172.16.199.0 using the address of the next hop router.

B. Create a default route to the link address of the next hop router.

C. Create a static route to the loopback address of the next hop router.

D. Create a default route to 172.16.199.9.

E. Modify the existing static route so that the next hop is 0.0.0.0.

F. Replace the ip default-network command with the ip default-gateway command.

Correct Answer: AB

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Unlike the ip default-gateway command, you can use ip default-network when ip routing is enabled on the Cisco router. When you configure ip default-network the

router considers routes to that network for installation as the gateway of last resort on the router.

For every network configured with ip default-network, if a router has a route to that network, that route is flagged as a candidate default route. However, in this

case if the router does not a route to the drfault network of 172.16.199.9, then you would need to ensure that this route exisits by creating a static route to172.16.199.0 using the address of the next hop router, or simply create a default route using the address of the next hop router.

QUESTION 300

Which algorithm heavily influenced the algorithm used by path-vector protocols?

A. Bellman-Ford

B. SPF

C. DUAL

D. Spanning-Tree

E. Adaptive

F. Deflection

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

A path vector protocol is a computer network routing protocol which maintains the path information that gets updated dynamically. Updates which have looped

through the network and returned to the same node are easily detected and discarded. This algorithm is sometimes used in BellmanFord routing algorithms to

avoid "Count to Infinity" problems.

Reference. http://en.wikipedia.org/wiki/Path_vector_protocol

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