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CCIE Routing and Switching Written Exam v5.1

QUESTION 471

DRAG DROP

Drag and drop the IPv6 multicast feature on the left to its corresponding function on the right.

 

clip_image002

 

Correct Answer:

clip_image004

 

 

QUESTION 472

Refer to the exhibit. Which feature can R1 use to fail over from R2 to R3 if the address for R2 becomes unavailable?

 

clip_image005

 

A.

Object tr
acking

B.

HSRP

C.

GLBP

D.

LACP

 

Correct Answer: A

Explanation:

The object tracking feature allows you to create a tracked object that multiple clients can use to modify the client behavior when a tracked object changes. Several clients register their interest with the tracking process, track the same object, and take different actions when the object state changes.

Clients include the following features:

 

clip_image007Embedded Event Manager (EEM)

clip_image007[1]Gateway Load Balancing Protocol (GLBP)

clip_image007[2]Hot Standby Redundancy Protocol (HSRP)

clip_image007[3]Virtual port channel (vPC)

clip_image007[4]Virtual Router Redundancy Protocol (VRRP)

 

The object tracking monitors the status of the tracked objects and communicates any changes made to interested clients. Each tracked object is identified by a unique number that clients can

use to configure the action to take when a tracked object changes state.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nxos/unicast/configuration/guide/l3_cli_nxos/l3_object.html

 

 

QUESTION 473

Which three parameters must match to establish OSPF neighbor adjacency? (Choose three.)

 

A.

the process ID

B.

the hello interval

C.

the subnet mask

D.

authentication

E.

the router ID

F.

the OSPF interface priority

 

Correct Answer: BCD

 

 

QUESTION 474

Which two methods does Cisco IOS XE use to implement separation between the data plane and control plane? (Choose two)

 

A.

the FED

B.

a Linux-based CPU scheduler to efficiently manage the control and data planes.

C.

separates FFM-spawned subshells in the Linux kernels for the control plane and the data plane.

D.

a set of APIs to manage data plane processes

E.

a set of APIs to manage control plane processes

 

Correct Answer: AE

 

 

QUESTION 475

Which TCP mechanism prevents the sender from sending data too quickly for the receiver to process?

 

A.

Congestion control

B.

Error detection

C.

Selective acknowledgement

D.

Flow control

 

Correct Answer: D

Explanation:

In data communications, flow control is the process of managing the rate of data transmission between two nodes to prevent a fast sender from overwhelming a slow receiver. It provides a mechanism for the receiver to control the transmission speed, so that the receiving node is not overwhelmed with data from transmitting node.

Reference: http://en.wikipedia.org/wiki/Flow_control_(data)

 

 

QUESTION 476

Which statement describes what it means if a router has an OSPF priority set to 0?

 

A.

A router with the OSPF priority set to 0 is one that can participate in the election of a DR. It has the highest priority.

B.

A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR, but it can become a BDR

C.

A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR. It can become neither a DR nor a BDR.

D.

A router with the OSPF priority set to 0 is one that cannot participate in the election of a BDR, but it can become a DR

 

Correct Answer: C

 

 

QUESTION 477

What is the most common use for route tagging in EIGRP?

 

A.

to determine the route source for management purposes

B.

to change the metric of a prefix

C.

to filter routes in order to prevent routing loops

D.

to modify path selection for certain classes of traffic

 

Correct Answer: C

 

 

QUESTION 478

Which three statements about RIPng are true? (Choose three.)

 

A.

It supports route tags.

B.

It sends updates on FF02::9.

C.

Its RTE last byte is 0XFF.

D.

It supports authentication.

E.

It sends updates on UDP port 520.

F.

It can be used on networks of greater than 15 hops.

 

Correct Answer: ABC

 

 

QUESTION 479

You are configuring Wireshark on a Cisco Catalyst 4500E Switch with a Supervisor 8. Which three actions can you take to prevent the capture from overloading the CPU? (Choose three.)

 

A.

Attach the specific ports that are part of the data path.

B.

Use an in-line filter.

C.

Use an appropriate ACL.

D.

Add memory to the Supervisor.

E.

Reconfigure the buffers to accommodate the additional traffic.

F.

Configure a policy map, class map, and an access list to express the match conditions.

 

Correct Answer: ABC

Explanation:

Because packet forwarding typically occurs in hardware, packets are not copied to the CPU for software processing. For Wireshark packet capture, packets are copied and delivered to the CPU, which causes an increase in CPU usage. To avoid high CPU, do the following:

Attach only relevant ports.

Use a class map, and secondarily, an access list to express match conditions. If neither is viable, use an explicit, in-line filter.

Adhere closely to the filter rules. Restrict the traffic type (such as, IPv4 only) with a restrictive, rather than relaxed ACL, which elicits unwanted traffic.

 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/15-1-2/XE_340/configuration/guide/config/wireshrk.pdf

 

 

QUESTION 480

Which statement about OTV is true?

 

A.

The overlay interface becomes active only when configuration is complete and it is manually enabled.

B.

OTV data groups can operate only in PIM sparse-mode.

C.

The overlay interface becomes active immediately when it is configured.

D.

The interface facing the OTV groups must be configured with the highest MTU possible.

 

Correct Answer: A

Explanation:

OTV has the following configuration guidelines and limitations:

If the same device serves as the default gateway in a VLAN interface and the OTV edge device for the VLANs being extended, configure OTV on a device (VDC or switch) that is separate from the VLAN interfaces (SVIs).

When possible, we recommend that you use a separate nondefault VDC for OTV to allow for better manageability and maintenance.

An overlay interface will only be in an up state if the overlay interface configuration is complete and enabled (no shutdown). The join interface has to be in an up state.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nxos/OTV/config_guide/b_Cisco_Nexus_7000_Series_NX-OS_OTV_Configuration_Guide/basicotv.html

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