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QUESTION NO:3

A new backup connection is being deployed on a remote site router. The stability of the connection

has been a concern. In order to provide more information to EIGRP regarding this interface, you

wish to incorporate the “reliability” cost metric in the EIGRP calculation with the command metric

weights 1 0 1 0 1.

What impact will this modification on the remote site router have for other existing EIGRP

neighborships from the same EIGRP domain?

A. Existing neighbors will immediately begin using the new metric.

B. Existing neighbors will use the new metric after clearing the EIGRP neighbors.

C. Existing neighbors will resync, maintaining the neighbor relationship.

D. All existing neighbor relationships will go down.

Answer: D

Explanation:

QUESTION NO:6

Why would a rogue host that is running a DHCP server on a campus LAN network present a

security risk?

A. It may allocate IP addresses from an unknown subnet to the users.

B. All multicast traffic can be sniffed by using the DHCP multicast capabilities.

C. The CPU utilization of the first hop router can be overloaded by exploiting DHCP relay open

ports.

D. A potential man-in-the-middle attack can be used against the clients.

Answer: D

Explanation:

QUESTION NO:12

Which two options are contained in a VTP subset advertisement? (Choose two.)

A. followers field

B. MD5 digest

C. VLAN information

D. sequence number

Answer: C,D

Explanation:

Subset Advertisements

When you add, delete, or change a VLAN in a Catalyst, the server Catalyst where the changes are

made increments the configuration revision and issues a summary advertisement. One or several

subset advertisements follow the summary advertisement. A subset advertisement contains a list

of VLAN information.

If there are several VLANs, more than one subset advertisement can be required in order to

advertise all the VLANs.

Subset Advertisement Packet Format

This formatted example shows that each VLAN information field contains information for a different

VLAN. It is ordered so that lowered-valued ISL VLAN IDs occur first:

Most of the fields in this packet are easy to understand. These are two clarifications:

Code

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:17

Which three combinations are valid LACP configurations that will set up a channel? (Choose

three.)

A. On/On

B. On/Auto

C. Passive/Active

D. Desirable/Auto

E. Active/Active

F. Desirable/Desirable

Answer: A,C,E

Explanation:

400-101 PDF Dumps400-101 VCE Dumps400-101 Practice Test

QUESTION NO:20

Refer to the exhibit.

What is the potential issue with this configuration?

A. There is no potential issue; OSPF will work fine in any condition.

B. Sub-optimal routing may occur since there is no area 1 adjacency between the ABRs.

C. This is a wrong OSPF configuration because all routers must be in area 0 only.

D. This is a wrong OSPF configuration because /30 requires 0.0.0.3 wild card.

Answer: B

Explanation:

QUESTION NO:25

Refer to the exhibit.

After a link flap in the network, which two EIGRP neighbors will not be queried for alternative

paths? (Choose two.)

A. 192.168.1.1

B. 192.168.3.7

C. 192.168.3.8

D. 192.168.3.6

E. 192.168.2.1

F. 192.168.3.9

Answer: B,C

Explanation:

Explanation

Both 192.168.3.7 and 192.168.3.8 are in an EIGRP Stub area

The Enhanced Interior Gateway Routing Protocol (EIGRP) Stub Routing feature improves network

stability, reduces resource utilization, and simplifies stub router configuration.

Stub routing is commonly used in a hub and spoke network topology. In a hub and spoke network,

one or more end (stub) networks are connected to a remote router (the spoke) that is connected to

one or more distribution routers (the hub). The remote router is adjacent only to one or more

distribution routers. The only route for IP traffic to follow into the remote router is through a

distribution router. This type of configuration is commonly used in WAN topologies where the

distribution router is directly connected to a WAN. The distribution router can be connected to

many more remote routers. Often, the distribution router will be connected to 100 or more remote

routers. In a hub and spoke topology, the remote router must forward all nonlocal traffic to a

distribution router, so it becomes unnecessary for the remote router to hold a complete routing

table. Generally, the distribution router need not send anything more than a default route to the

remote router.

When using the EIGRP Stub Routing feature, you need to configure the distribution and remote

routers to use EIGRP, and to configure only the remote router as a stub. Only specified routes are

propagated from the remote (stub) router. The router responds to queries for summaries,

connected routes, redistributed static routes, external routes, and internal routes with the message

“inaccessible.” A router that is configured as a stub will send a special peer information packet to

all neighboring routers to report its status as a stub router. Any neighbor that receives a packet

informing it of the stub status will not query the stub router for any routes, and a router that has a

stub peer will not query that peer. The stub router will depend on the distribution router to send the

proper updates to all peers.

Reference

http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/eigrpstb.html#wp1021949

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

QUESTION NO:33

Which two OSPF LSA types are new in OSPF version 3? (Choose two.)

A. Link

B. NSSA external

C. Network link

D. Intra-area prefix

E. AS domain

Answer: A,D

Explanation:

New LSA Types

OSPFv3 carries over the seven basic LSA types we’re familiar with from OSPFv2. However, the

type 1 and 2 LSAs have been re-purposed, as will be discussed in a bit. OSPFv3 also introduces

two new LSA types: Link and Intra-area Prefix.

Reference

http://packetlife.net/blog/2010/mar/2/ospfv2-versus-ospfv3/

QUESTION NO:34

In order to maintain security, with which hop count are IPv6 neighbor discovery packets sent?

A. 0

B. 1

C. 255

D. 256

Answer: C

Explanation:

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