2016NEW Cisco.CCIE.(400-101)EXAM] CCIE Routing and Switching EXAM A PART14 (301-320) VCE DUMPS FOR FREE DOWNLOAD WITH 100%PASS ENSURE

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QUESTION 301

Refer to the exhibit.

All of the routers on this network are running RIP. If you edit the R3 RIP process configuration to reduce the number of hops from R3 to R1, which statement about

the configuration change is true?

A. Configuring no passive-interface for GigabitEthernet0/0 in the R3 RIP process reduces the number of hops to R1 by 2.

B. Configuring no passive-interface for GigabitEthernet0/0 in the R3 RIP process reduces the number of hops to R1 by 1.

C. Configuring no passive-interface for GigabitEthernet0/1 in the R3 RIP process reduces the number of hops to R1 by 3.

D. Configuring no passive-interface for GigabitEthernet0/1 in the R3 RIP process reduces the number of hops to R1 by 1.

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

By changing the link from R3 to R2 to not be passive, traffic can then take the direct route from R3-R2-R1 instead of the longer path of R3-R6-R5-R4-R1, resulting

in two less hops.QUESTION 302

Where should the passive-interface command be used?

A. Under the routing process for interfaces that need to be routed, but prevented from peering

B. under the routing process for interfaces that need to be routed and allowed to peer

C. under the interface configuration for interfaces that need to be routed, but prevented from peering

D. under the interface configuration for interfaces that need to be routed and allowed to peer

E. under the VTY configuration within global configuration mode

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Passive-interface is a feature you enable on a per interface basis which allows a particular interface to participate in a routing process but prevents that interface

from forming neighbor relationships by not sending hello packets and discarding received hello packets.

QUESTION 303

Refer to the exhibit.

Which statement about the device routing table is true?

A. Only networks 10.10.10.0/24 and smaller from host 192.168.168.1 are in the routing table.

B. Only networks 10.10.10.0/24 and larger from host 192.168.168.1 are in the routing table.

C. Only network 10.10.10.0/24 from host 192.168.168.1 is in the routing table.

D. Networks 10.10.10.0/24 and smaller from any host are in the routing table.

Correct Answer: A

Section: Layer 3 TechnologiesExplanation

Explanation/Reference:

Explanation:

When you add the keywords "GE" and "LE" to the prefix-list, the "len" value changes its meaning. When using GE and LE, the len value specifies how many bits of

the prefix you are checking, starting with the most significant bit.

ip prefix-list LIST permit 1.2.3.0/24 le 32

This means:

Check the first 24 bits of the prefix 1.2.3.0

The subnet mask must be less than or equal to 32

Reference. http://blog.ine.com/2007/12/26/how-do-prefix-lists-work/

QUESTION 304

Refer to the exhibit.

R1 is performing mutual redistribution, but OSPF routes from R3 are unable to reach R2. Which three options are possible reasons for this behavior? (Choose

three.)

A. R1 requires a seed metric to redistribute RIP.

B. The RIP version supports only classful subnet masks.

C. R1 is filtering OSPF routes when redistributing into RIP.D. R3 and R1 have the same router ID.

E. R1 and R3 have an MTU mismatch.

F. R2 is configured to offset OSPF routes with a metric of 16.

Correct Answer: ACF

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

A. 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. We’ve got to give RIP a metric it understands when

redistributing routes into that protocol, so let’s go back to R1 and do so.

C. Filtering routes is another explanation, if the routes to R2 are boing filtered from being advertised to R1.

F. If the metric is offset to 16, then the routes will have reached the maximum hop count when redistributed to RIP. The max hop count for RIP is 16.

QUESTION 305

Refer to the exhibit.

If the downstream router has a summary route configured, which two actions must you take on the local router to create the summary route that summarizes all

routes from the downstream router? (Choose two.)

A. Configure the summary address on the interface.

B. Use 10.0.0.0 255.248.0.0 as the summary route.

C. Configure the summary address in the EIGRP process.

D. Use 10.0.0.0 255.252.0.0 as the summary route.

E. Configure a route map to permit the route.

F. Configure a distribute list in.

Correct Answer: AB

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Route summarization works in conjunction with the ip summary-address eigrp interface configuration command, in which additional summarization can be

performed. To correctly summarize all the networks shown, the correct route to use is 10.0.0.0 255.248.0.0

Reference.

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

QUESTION 306

Which three statements about RIP timers are true? (Choose three.)

A. The default update timer is 30 seconds.

B. The default invalid timer is 180 seconds.

C. The default holddown timer is 180 seconds.

D. The default flush timer is 60 seconds.

E. The default scan timer is 60 seconds.

F. The default hello timer is 5 seconds.

Correct Answer: ABC

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

The routing information protocol uses the following timers as part of its operation:

Update Timer

Invalid Timer

Flush Timer

Holddown Timer

Update TimerThe update timer controls the interval between two gratuitous Response Message. By default the value is 30 seconds. The response message is broadcast to all

its RIP enabled interface.

Invalid Timer

The invalid timer specifies how long a routing entry can be in the routing table without being updated. This is also called as expiration Timer. By default, the value

is 180 seconds. After the timer expires the hop count of the routing entry will be set to 16, marking the destination as unreachable.

Flush Timer

The flush timer controls the time between the route is invalidated or marked as unreachable and removal of entry from the routing table. By default the value is 240

seconds. This is 60 seconds longer than Invalid timer. So for 60 seconds the router will be advertising about this unreachable route to all its neighbors. This timer

must be set to a higher value than the invalid timer.

Hold-down Timer

The hold-down timer is started per route entry, when the hop count is changing from lower value to higher value. This allows the route to get stabilized. During this

time no update can be done to that routing entry. This is not part of the RFC 1058. This is Cisco’s implementation. The default value of this timer is 180 seconds.

Reference. http://en.wikipedia.org/wiki/Routing_Information_Protocol#Timers

QUESTION 307

Which timer expiration can lead to an EIGRP route becoming stuck in active?

A. hello

B. active

C. query

D. hold

Correct Answer: B

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

As noted above, when a route goes into the active state, the router queries its neighbors to find a path to the pertinent network. At this point, the router starts a

three minute active timer by which time it must receive replies from all queried neighbors. If a neighbor has feasible successors for the route, it will recalculate its

own local distance to the network and report this back. However, if a neighbor does not have a feasible successor, it also goes into active state. In some cases,

multiple routers along multiple query paths will go into active state as routers continue to query for the desired route. In most cases, this process will yield

responses from all queried routers and the sought after route will transition back into the passive state within the three minute SIA query timer. In the case that

none of the queried routers can provide a feasible successor, the route is cleared.

In some cases, a response is not received between two neighbor routers because of link failures, congestion or some other adverse condition in either the network

or on the queried router, and the three minute active timer expires on the router originating the query. When this happens, the querying router that did not receive

a response logs a "DUAL-3-SIA" or "stuck-in-active" error for the route and then drops and restarts its adjacency with the non-responding router

Reference. http://www.packetdesign.com/resources/technical-briefs/diagnosing-eigrp-stuck-activeQUESTION 308

Which three values can be used to tag external EIGRP routes? (Choose three.)

A. The router ID of the router that redistributed the route

B. The administrative distance of the external protocol

C. The protocol ID of the external protocol

D. The cost to reach the router that redistributed the route

E. The metric from the external protocol

F. The router ID of the router from which the external protocol route was learned

Correct Answer: ACE

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

EIGRP has the notion of internal and external routes. Internal routes are ones that have been originated within an EIGRP autonomous system (AS). Therefore, a

directly attached network that is configured to run EIGRP is considered an internal route and is propagated with this information throughout the EIGRP AS.

External routes are ones that have been learned by another routing protocol or reside in the routing table as static routes. These routes are tagged individually with

the identity of their origination.

External routes are tagged with the following information:

The router ID of the EIGRP router that redistributed the route.

The AS number where the destination resides.

A configurable administrator tag.

Protocol ID of the external protocol.

The metric from the external protocol.

Bit flags for default routing.

Reference. http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing- protocol-eigrp/13669-1.html#route_tagging

QUESTION 309

Which data plane protocol does EIGRP Over the Top use?

A. MPLS

B. GRE

C. LISP

D. IP-in-IP

Correct Answer: CSection: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

The EIGRP Over the Top solution can be used to ensure connectivity between disparate Enhanced Interior Gateway Routing Protocol (EIGRP) sites. This feature

uses EIGRP on the control plane and Locator ID Separation Protocol (LISP) encapsulation on the data plane to route traffic across the underlying WAN

architecture. EIGRP is used to distribute routes between customer edge (CE) devices within the network, and the traffic forwarded across the WAN architecture is

LISP encapsulated. Therefore, to connect disparate EIGRP sites, you must configure the neighbor command with LISP encapsulation on every CE in the network.

Reference. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/xe-3s/ire- xe-3s-book/ire-eigrp-over-the-top.html

QUESTION 310

Which statement about the feasible distance in EIGRP is true?

A. It is the maximum metric that should feasibly be considered for installation in the RIB.

B. It is the minimum metric to reach the destination as stored in the topology table.

C. It is the metric that is supplied by the best next hop toward the destination.

D. It is the maximum metric possible based on the maximum hop count that is allowed.

Correct Answer: B

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

An EIGRP router advertises each destination it can reach as a route with an attached metric. This metric is called the route’s reported distance (the term

advertised distance has also been used in older documentation). A successor route for any given destination is chosen as having the lowest computed feasible

distance; that is, the lowest sum of reported distance plus the cost to get to the advertising router.

By default, an EIGRP router will store only the route with the best (lowest) feasible distance in the routing table (or, multiple routes with equivalent feasible

distances).

Reference. http://packetlife.net/blog/2010/aug/9/eigrp-feasible-successor-routes/

QUESTION 311

Which statement about the EIGRP RTO is true?

A. It is six times the SRTT.

B. It is the time that it normally takes for an update to be received by a peer.

C. It is the time that it normally takes to receive a reply to a query.D. It is the average time that it takes for a reliable packet to be acknowledged.

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

The RTO is typically six times the SRTT, the value may vary from a minimum of 200 microseconds (ms) to a maximum of 5 seconds (s).

Reference. EIGRP for IP: Basic Operation and Configuration, Alvaro Retana, Russ White, Don Slice – 2000

QUESTION 312

Which option describes the purpose of the leak-map keyword in the command eigrp stub connected leak-map EigrpLeak?

A. It allows the specified static routes to be advertised.

B. It allows exceptions to the route summarization that is configured.

C. It allows specified EIGRP-learned routes to be advertised.

D. It restricts specified connected routes from being advertised.

Correct Answer: C

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

ExamplE. eigrp stub leak-map Command

In the following example, the eigrp stub command is issued with the leak-map name keyword- argument pair to configure the device to reference a leak map that

identifies routes to be advertised that would have been suppressed otherwisE.

Device(config)# router eigrp 1

Device(config-router)# network 10.0.0.0

Device(config-router)# eigrp stub leak-map map1

Reference. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15- mt/ire-15-mt-book/ire-eigrp-stub-rtg.html#GUID-FB899CA9-E9DE-

48D8-8048-C971179E4E24

QUESTION 313

Refer to the exhibit.

If OSPF is implemented on the network, which additional configuration is needed to allow traffic from host 10.4.1.15/24 to host 10.1.2.20/24?

A. A virtual link between router 2 and router 4

B. A virtual link between router 3 and router 4

C. A virtual link between router 2 and router 3

D. The current design allows traffic between the two hosts.

Correct Answer: D

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

This specific traffic from 10.4.1.0/24 to 10.1.2.0/24 would work because this traffic crosses only over the single OSPF area of 0.0.0.1.However, traffic from hosts on R4 to R1 would indeed need a virtual link, since area 0.0.0.2 is not connected to the backbone area of 0.0.0.0.

QUESTION 314

Refer to the exhibit.

Which OSPFv3 routes will be visible in the routing table of R2?A. 2001:12::1/128

B. 2001:12::1/128, 2001:112::1/128

C. 2001:12::2/128

D. No OSPFv3 routes will be visible.

Correct Answer: D

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

The command "ipv6 unicast-routing" needs to be configured on both routers before any IPv6 routes will be seen.

QUESTION 315

Refer to the exhibit.

R1 is configured as shown. R1 is able to establish a neighbor adjacency only with R2. Which addition must you make to the R1 configuration to allow it to establish

an adjacency with R3?

A. interface gigabitethernet 0/1

ip address 10.1.0.1 255.255.255.0

ip ospf network point-to-point

B. interface gigabitethernet 0/1

ip address 10.1.0.1 255.255.255.0

ip ospf 1 area 0

C. router ospf 1

network 10.1.0.0 0.0.0.255 area 1

D. router ospf 1

area 0 stub

Correct Answer: C

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

To enable interfaces and networks with OSPF, the networks need to be specified in the network statement. In the configuration shown, only 10.0.0.0/24 has been

enabled, we are missing the network connecting to R3 (10.1.0.0/24).

QUESTION 316Which option describes how a router responds if LSA throttling is configured and it receives the identical LSA before the interval is set?

A. The LSA is added to the OSPF database and a notification is sent to the sending router to slow down its LSA packet updates.

B. The LSA is added to the OSPF database.

C. The LSA is ignored.

D. The LSA is ignored and a notification is sent to the sending router to slow down its LSA packet updates.

Correct Answer: C

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

How OSPF LSA Throttling Works

The timers throttle lsa all command controls the generation (sending) of LSAs. The first LSA is always generated immediately upon an OSPF topology change,

and the next LSA generated is controlled by the minimum start interval. The subsequent LSAs generated for the same LSA are rate-limited until the maximum

interval is reached. The "same LSA" is defined as an LSA instance that contains the same LSA ID number, LSA type, and advertising router ID.

The timers lsa arrival command controls the minimum interval for accepting the same LSA. If an instance of the same LSA arrives sooner than the interval that is

set, the LSA is dropped. It is recommended that the arrival interval be less than or equal to the hold-time interval of the timers throttle lsa all command.

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

QUESTION 317

Which two options are valid for the number of bytes in a BGP AS number? (Choose two.)

A. 2 bytes

B. 4 bytes

C. 6 bytes

D. 8 bytes

E. 16 bytes

Correct Answer: AB

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

During the early time of BGP development and standardization, it was assumed that availability of a 16 bit binary number to identify the Autonomous System (AS)

within BGP would have been more than sufficient. The 16 bit AS number, also known as the 2-byte AS number, provides a pool of 65536 unique AutonomousSystem numbers. The IANA manages the available BGP Autonomous System Numbers (ASN) pool, with the assignments being carried out by the Regional

Registries.

The current consumption rate of the publicly available AS numbers suggests that the entire public 2-byte ASN pool will be fully depleted. A solution to this

depletion is the expansion of the existing 2-byte AS number to a 4-byte AS number, which provides a theoretical 4,294,967,296 unique AS numbers. ARIN has

made the following policy changes in conjunction with the adoption of the solution.

The Cisco IOS BGP "4-byte ASN" feature allows BGP to carry a Autonomous System Number (ASN) encoded as a 4-byte entity. The addition of this feature

allows an operator to use an expanded 4-byte AS number granted by IANA.

QUESTION 318

Refer to the exhibit.

Why is the loopback 0 interface of R4 missing in the routing table of R2?A. R2 is configured as a route reflector client.

B. There is no peering between R2 and R3.

C. The next hop is not reachable from R2.

D. The route originated within the same AS.

Correct Answer: B

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

In the "show ip bgp" output we see that there is no peering session between R2 and R3. Since R3 is the route reflector here, R3 would reflect routes advertised

from R4 to R2, but the peer needs to be established first.

QUESTION 319

Which statement about the BGP scope of the cost community is true?

A. It is shared with IBGP neighbors only.

B. It is shared with IBGP neighbors and route reflectors.

C. It is shared with EBGP neighbors only.

D. It is shared with IBGP and EBGP neighbors.

E. It is shared with IBGP and confederation peers.

Correct Answer: E

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

The BGP Cost Community feature introduces the cost extended community attribute. The cost community is a non-transitive extended community attribute that is

passed to internal BGP (iBGP) and confederation peers but not to external BGP (eBGP) peers. The cost community feature allows you to customize the local

route preference and influence the best path selection process by assigning cost values to specific routes.

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

QUESTION 320

Which statement is true about conditional advertisements?A. Conditional advertisements create routes when a predefined condition is met.

B. Conditional advertisements create routes when a predefined condition is not met.

C. Conditional advertisements delete routes when a predefined condition is met.

D. Conditional advertisements create routes and withhold them until a predefined condition is met.

E. Conditional advertisements do not create routes, they only withhold them until a predefined condition is met.

Correct Answer: E

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

The Border Gateway Protocol (BGP) conditional advertisement feature provides additional control of route advertisement, depending on the existence of other

prefixes in the BGP table.

Normally, routes are propagated regardless of the existence of a different path. The BGP conditional advertisement feature uses the non-exist-map and the

advertise-map keywords of the neighbor advertise-map command in order to track routes by the route prefix. If a route prefix is not present in output of the nonexist-

map command, then the route specified by the advertise-map command is announced. This feature is useful for multihomed networks, in which some

prefixes are advertised to one of the providers only if information from the other provider is not present (this indicates a failure in the peering session or partial

reachability). Reference. http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/16137- cond-adv.html

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