[Free] February 2017(Feb) Ensurepass Examcollection Cisco 400-101 Practice Test 441-450

Ensurepass

CCIE Routing and Switching Written Exam v5.1

 

QUESTION 441

Which two options are signaling protocols that are used in MPLS? (Choose two.)

 

A.

LDP

B.

RSVP

C.

BFD

D.

LISP

E.

CLNS

F.

CDP

 

Correct Answer: AB

Explanation:

* Signaling is the means by which LSRs all along the path know that they are a part of a given LSP. It is a signaling function by which the LSR knows that the internal transit path for the LSP depicted goes from Interface 2 to Interface 4.

* Label distribution is the means by which an LSR tells an upstream LSR what label value to use for a particular LSP.

There are four protocols that can perform the label distribution function:

* Label Distribution Protocol (LDP)

* Resource Reservation Protocol with Traffic Engineering Extensions (RSVP-TE)

* Constraint-Based Routed LDP (CR-LDP)

* Multiprotocol BGP

LDP and RSVP-TE are the two most commonly used label distribution protocols

Reference: http://www.networkworld.com/article/2237487/cisco-subnet/understanding-mpls-label-distribution.html

 

 

QUESTION 442

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

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 Bellman-Ford routing algorithms to avoid “Count to Infinity” problems.

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

 

 

QUESTION 443

Refer to the exhibit. Which two conditions can cause this error message to be displayed on the console? (Choose two.)

 

clip_image001

 

A.

The EtherChannel is configured as desirable on both ends.

B.

The port-channel on the adjacent device is misconfigured.

C.

There is a speed and duplex mismatch on interface fa0/12.

D.

The EtherChannel is configured as auto on one of the interfaces.

 

Correct Answer: BC

 

 

QUESTION 444

Which two statements about the command distance bgp 90 60 120 are true? (Choose two.)

 

A.

Implementing the command is a Cisco best practice.

B.

The external distance it sets is preferred over the internal distance.

C.

The internal distance it sets is preferred over the external distance.

D.

The local distance it sets may conflict with the EIGRP administrative distance.

E.

The internal distance it sets may conflict with the EIGRP administrative distance.

F.

The local distance it sets may conflict with the RIP administrative distance.

 

Correct Answer: CF

Explanation:

To allow the use of external, internal, and local administrative distances that could be a better route than other external, internal, or local routes to a node, use the distance bgp command in address family or router configuration mode. To return to the default values, use the no form of this command.

distance bgp external-distance internal-distance local-distance

no distance bgp

Syntax Description

external-distance

Administrative distance for BGP external routes. External routes are routes for which the best path is learned from a neighbor external to the autonomous system. Accept table values are from 1 to 255. The default is 20. Routes with a distance of 255 are not installed in the routing table.

internal-distance

Administrative distance for BGP internal routes. Internal routes are those routes that are learned from another BGP entity within the same autonomous system. Accept table values are from 1 to 255. The default is 200. Routes with a distance of 255 are not installed in the routing table.

local-distance

Administrative distance for BGP local routes. Local routes are those networks listed with a network router configuration command, often as back doors, for that router or for networks that are being

redistributed from another process. Accept table values are from 1 to 255. The default is 200. Routes with a distance of 255 are not installed in the routing table.

 

Defaults

external-distance: 20

internal-distance: 200

local-distance: 200

 

In this case, the internal distance is 60 and the external is 90, and the local distance is 120 (same as RIP).

Reference:

http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfbgp1.html#wp1113874

 

 

QUESTION 445

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

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 446

Which two statements about the max-age time in IS-IS are true? (Choose two.)

 

A.

The IS-IS max-age time is 20 minutes by default.

B.

The IS-IS max-age time is 60 minutes by default.

C.

The IS-IS max-age time increments from zero to max-age.

D.

The IS-IS max-age time decrements from max-age to zero.

 

Correct Answer: AD

 

 

QUESTION 447

Which three options are sub-subfields of the IPv4 Option Type subfield? (Choose three.)

 

A.

Option Class

B.

GET

C.

Copied

D.

PUSH

E.

Option Number

F.

TTL

 

Correct Answer: ACE

Explanation:

Each IP option has its own subfield format, generally structured as shown below. For most options, all three subfields are useD. Option Type, Option Length and Option Data.

 

clip_image003

 

Reference: http://www.tcpipguide.com/free/t_IPDatagramOptionsandOptionFormat.htm

 

 

QUESTION 448

Which three statements about Cisco HDLC are true? (Choose three.)

 

A.

HDLC serial encapsulation provides asynchronous framing and error detection.

B.

Serial link keepalives are maintained by SLARP.

C.

HDLC serial encapsulation provides synchronous framing without retransmission.

D.

HDLC frame size can be reduced with MPPC compression.

E.

The interface is brought down after five ignored keepalives.

F.

The interface is brought down after three ignored keepalives.

 

Correct Answer: BCF


Explanation:

Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. Cisco HDLC also provides a simple control protocol called Serial Line Address Resolution Protocol (SLARP) to maintain serial link keepalives. For each encapsulation type, a certain number of keepalives ignored by a peer triggers the serial interface to transition to the down state. For HDLC encapsulation, three ignored keepalives causes the interface to be brought down.

By default, synchronous serial lines use the High-Level Data Link Control (HDLC) serial encapsulation method, which provides the synchronous framing and error detection functions of HDLC without windowing or retransmission.

Reference: http://www.cisco.com/c/en/us/td/docs/routers/access/800/819/software/configuration/Guide/819_SCG/6ser_conf.html#78662

 

 

QUESTION 449

On which three options can Cisco PfR base its traffic routing? (Choose three.)

 

A.

Time of day

B.

An access list with permit or deny statements

C.

Load-balancing requirements

D.

Network performance

E.

User-defined link capacity thresholds

F.

Router IOS version

 

Correct Answer: CDE

Explanation:

Key Advantages of using PfR for Load balancing:

Utilization based load-balancing: PfR takes real-time link utilization into account when load balancing the links. This will ensure that a link will not go beyond a certain percentage of its maximum capacity (75% by default).

 

Application Performance based Load Balancing: PfR does not randomly forward traffic through one link or another. It takes application performance requirements into consideration and then forwards the traffic through a link which meets the performance policy requirements. PfR also load balances the link at the same time.

 

Bi-directional Solution: PfR is a bi-directional load balancing solution which influences outbound as well as in-bound traffic.

 

Consolidated Centralized View: PfR offers consolidated and centralized view of the state of all external links in the network. At any given time, the network administrator can see the current link utilization (in kbps and percentage of its capacity), maximum link threshold, and the policies applied to the links in the network.

 

Reference: http://docwiki.cisco.com/wiki/PfR:Solutions:InternetOutboundLoadBalancing

 

 

QUESTION 450

Which three options are results of the command no mpls ip propagate-ttl? (Choose three.)

 

A.

It prevents the TTL from being copied from the IP header to the MPLS header.

B.

It prevents the MPLS hops from being visible to a CE router when you perform a traceroute.

C.

A fixed TTL value of 255 is used for the first label of the IP packet.

D.

It prevents the TTL from being copied from the MPLS header back into the IP header.

E.

MPLS hops remain visible on a CE router when you perform a traceroute.

F.

A fixed TTL value of 1 is used for the first label of the IP packet.

 

Correct Answer: ABC

 

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