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QUESTION NO:1

Which two commands are required to enable multicast on a router, knowing that the receivers only

support IGMPv2? (Choose two.)

A. ip pim rp-address

B. ip pim ssm

C. ip pim sparse-mode

D. ip pim passive

Answer: A,C

Explanation:

Sparse mode logic (pull mode) is the opposite of Dense mode logic (push mode), in Dense mode

it is supposed that in every network there is someone who is requesting the multicast traffic so

PIM-DM routers begin by flooding the multicast traffic out of all their interfaces except those from

where a prune message is received to eliminate the

QUESTION NO:15

Which three options are considered in the spanning-tree decision process? (Choose three.)

A. lowest root bridge ID

B. lowest path cost to root bridge

C. lowest sender bridge ID

D. highest port ID

E. highest root bridge ID

F. highest path cost to root bridge

Answer: A,B,C

Explanation:

Configuration bridge protocol data units (BPDUs) are sent between switches for each port.

Switches use s four step process to save a copy of the best BPDU seen on every port. When a

port receives a better BPDU, it stops sending them. If the BPDUs stop arriving for 20 seconds

(default), it begins sending them again.

Step 1 Lowest Root Bridge ID (BID)

Step 2 Lowest Path Cost to Root Bridge

Step 3 Lowest Sender BID

Step 4 Lowest Port ID

Reference

Cisco General Networking Theory Quick Reference Sheets

QUESTION NO:21

Refer to the exhibit.

A packet from RTD with destination RTG, is reaching RTB. What is the path this packet will take

from RTB to reach RTG?

A. RTB – RTA – RTG

B. RTB – RTD – RTC – RTA – RTG

C. RTB – RTF – RTE – RTA – RTG

D. RTB will not be able to reach RTG since the OSPF configuration is wrong.

Answer: C

Explanation:

QUESTION NO:26

Refer to the exhibit.

Why is AS 65333 in parentheses?

A. It is an external AS.

B. It is a confederation AS.

C. It is the AS of a route reflector.

D. It is our own AS.

E. A route map has been applied to this route.

F. The BGP next hop is unreachable.

Answer: B

Explanation:

QUESTION NO:36

For which routes does LDP advertise a label binding?

A. all routes in the routing table

B. only the IGP and BGP routes in the routing table

C. only the BGP routes in the routing table

D. only the IGP routes in the routing table

Answer: D

Explanation:

400-101 PDF Dumps400-101 Practice Test400-101 Study Guide

QUESTION NO:37

Which command can be used on a PE router to connect to a CE router (11.1.1.4) in VRF red?

A. telnet 11.1.1.4 /vrf-source red

B. telnet 11.1.1.4 source /vrf red

C. telnet 11.1.1.4 /source vrf red

D. telnet 11.1.1.4 /vrf red

E. telnet 11.1.1.4 vrf red

Answer: D

Explanation:

Telnetting can be done through the VRF using the Management Ethernet interface. In the

following example, the router telnets to 172.17.1.1 through the Management Ethernet interface

VRF:

Router# telnet 172.17.1.1 /vrf Mgmt-intf

Reference

http://www.cisco.com/en/US/docs/routers/asr1000/configuration/guide/chassis/Management_Ether

net.html

QUESTION NO:44

How is RPF used in multicast routing?

A. to prevent multicast packets from looping

B. to prevent PIM packets from looping

C. to instruct PIM where to send a (*, G) or (S, G) join message

D. to prevent multicast packets from looping and to instruct PIM where to send a (*, G) or (S, G)

join message

Answer: D

Explanation:

QUESTION NO:51

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

A. It is a Cisco proprietary protocol.

B. It runs on TCP port 59. .

C. Authentication and authorization are done at different stages.

D. TACACS encrypts the entire body of the packet, but leaves a standard TACACS header.

E. It is an industry standard protocol.

F. TACACS encrypts both the entire body of the packet and the TACACS header.

Answer: A,C,D

Explanation:

TACACS utilizes TCP port 49. It consists of three separate protocols, which can be implemented

on separate

servers.[1]

TACACS offers multiprotocol support, such as IP and AppleTalk. Normal operation fully encrypts

the body of the packet for more secure communications. It is a Cisco proprietary enhancement to

the original TACACS protocol.

Reference

http://en.wikipedia.org/wiki/TACACS+

QUESTION NO:57

Refer to the exhibit.

What would be the security risk when you are using the above configuration?

A. The locally configured users would override the TACACS security policy.

B. It would be impossible to log in to the router if the TACACS server is down.

C. The default login policy would override the TACACS configuration.

D. If the TACACS server failed, no authentication would be required.

Answer: D

Explanation:

QUESTION NO:63

Refer to the Exhibit.

The displayed QoS configuration has been configured on a router.

IPv6 is being implemented on the router, and it is required to convert the QoS policy to support

both IPv4 and IPv6 on the same class.

Which alternative configuration would allow matching DSCP AF41 for both IPv4 and IPv6 on the

same class map?

A. Class-map match-all CLASS1

Match dscp af41

B. Class-map match-all CLASS1

Match ip dscp af41

Match ipv6 dscp af41

C. Class-map match-any CLASS1

Match ip dscp af41

Match ipv6 dscp af41

D. Class-map match-any CLASS1

Match qos-group af41

Answer: A

Explanation: Explanation

“match dscp” matches both IPv4 and IPv6 traffic while “match ip dscp” matches only IPv4 traffic

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