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QUESTION NO:11

When you are troubleshooting duplex mismatches, which two errors are typically seen on the full-

duplex end? (Choose two.)

A. runts

B. FCS errors

C. interface resets

D. late collisions

Answer: A,B

Explanation:

QUESTION NO:14

Which three options are features of VTP version 3? (Choose three.)

A. VTPv3 supports 8K VLANs.

B. VTPv3 supports private VLAN mapping.

C. VTPv3 allows for domain discovery.

D. VTPv3 uses a primary server concept to avoid configuration revision issues.

E. VTPv3 is not compatible with VTPv1 or VTPv2.

F. VTPv3 has a hidden password option.

Answer: B,D,F

Explanation:

Key Benefits of VTP Version 3

Much work has gone into improving the usability of VTP version 3 in three major areas:

The new version of VTP offers better administrative control over which device is allowed to update

other devices\’ view of the VLAN topology. The chance of unintended and disruptive changes is

significantly reduced, and availability is increased. The reduced risk of unintended changes will

ease the change process and help speed deployment.

Functionality for the VLAN environment has been significantly expanded. Two enhancements are

most beneficial for today\’s networks:

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:22

Refer to the exhibit.

Which path is selected as best path?

A. path 1, because it is learned from IGP B.

path 1, because the metric is the lowest C.

path 2, because it is external

D. path 2, because it has the higher router ID

Answer: B

Explanation:

QUESTION NO:32

Which two tunneling techniques support IPv6 multicasting? (Choose two.)

A. 6to4

B. 6over4

C. ISATAP

D. 6PE

E. GRE

Answer: B,E

Explanation:

When IPv6 multicast is supported (over a 6to4 tunnel), an IPv6 multicast routing protocol must be

used

Restrictions for Implementing IPv6 Multicast

IPv6 multicast for Cisco IOS software uses MLD version 2. This version of MLD is fully backward-

compatible with MLD version 1 (described in RFC 2710). Hosts that support only MLD version 1

will interoperate with a router running MLD version 2. Mixed LANs with both MLD version 1 and

MLD version 2 hosts are likewise supported.

IPv6 multicast is supported only over IPv4 tunnels in Cisco IOS Release 12.3(2)T, Cisco IOS

Release 12.2

(18)S, and Cisco IOS Release 12.0(26)S.

When the bidirectional (bidir) range is used in a network, all routers in that network must be able to

understand the bidirectional range in the bootstrap message (BSM).

IPv6 multicast routing is disabled by default when the ipv6 unicast-routing command is configured.

On Cisco Catalyst 6500 and Cisco 7600 series routers, the ipv6 multicast-routing also must be

enabled in order to use IPv6 unicast routing

Reference http://www.cisco.com/web/about/ac123/ac147/ac174/ac197/

about_cisco_ipj_archive_article09186a00800c830a.html

http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-multicast.html

https://supportforums.cisco.com/thread/183386

400-101 PDF Dumps400-101 VCE Dumps400-101 Exam Questions

QUESTION NO:46

Refer to the exhibit.

Which interface(s) will show ip rpf 1.1.1.2 indicate as RPF interface(s)?

A. Ethernet 1/0

B. Ethernet 0/0

C. Both Ethernet 0/0 and Ethernet 1/0

D. RPF will fail

Answer: A

Explanation:

When troubleshooting multicast routing, the primary concern is the source address. Multicast has

a concept of Reverse Path Forwarding check (RPF check). When a multicast packet arrives on an

interface, the RPF process checks to ensure that this incoming interface is the outgoing interface

used by unicast routing to reach the source of the multicast packet. This RPF check process

prevents loops. Multicast routing does not forward a packet unless the source of the packet

passes a reverse path forwarding (RPF) check. Once a packet passes this RPF check, multicast

routing forwards the packet based only upon the destination address.

Reference

http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080094b55.shtml

QUESTION NO:53

Refer to the exhibit.

Which statement is correct?

A. This configuration is not valid.

B. Control Plane Policing is configured; however you cannot determine on which interface it is

configured.

C. NTP is not configured on the router.

D. Telnet traffic will be dropped.

Answer: C

Explanation: Display the current connection table for the router. For example, for IOS routers,

type “show control-plane host open-ports” Press “Enter.” The router will display a table with one

line for each currently open connection. The fourth column from the left is labeled “Service;” the

entries under that column correspond to the protocols currently in use. The current TCP traffic

corresponds exactly to the table entries that have “TCP” under the fourth column.

QUESTION NO:54

What does Cisco recommend when you are enabling Cisco IOS IPS?

A. Do not enable all the signatures at the same time.

B. Do not enable the ICMP signature.

C. Disable the Zone-Based Policy Firewall because it is not compatible with Cisco IOS IPS.

D. Disable CEF because it is not compatible with Cisco IOS IPS. .

Answer: A

Explanation:

QUESTION NO:59

What is true about IP Source Guard with port security?

A. Binding should be manually configured.

B. It is not supported if IEEE 802.1x port-based authentication is enabled

C. The DHCP server must support option 82, or the client is not assigned an IP address.

D. It filters based on source IP address only.

Answer: C

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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