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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: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:4

Refer to the exhibit.

R1 has an EBGP session to ISP 1 and an EBGP session to ISP 2. R1 receives the same prefixes

through both links.

Which configuration should be applied so that the link between R1 and ISP 2 will be preferred for

outgoing traffic (R1 to ISP 2)?

A. Increase local preference on R1 for received routes

B. Decrease local preference on R1 for received routes

C. Increase MED on ISP 2 for received routes

D. Decrease MED on ISP 2 for received routes

Answer: A

Explanation: Explanation

Local preference is an indication to the AS about which path has preference to exit the AS in order

to reach a certain network. A path with higher local preference is preferred more. The default value

of preference is 100.

Reference

http://www.cisco.com/en/US/tech/tk872/technologies_configuration_example09186a0080b82d1f.s

html?

referring_site=smartnavRD

QUESTION NO:9

Which two are effects of connecting a network segment that is running 802.1D to a network

segment that is running 802.1w? (Choose two.)

A. The entire network switches to 802.1D and generates BPDUs to determine root bridge status. B.

A migration delay of three seconds occurs when the port that is connected to the 802.1D bridge

comes up.

C. The entire network reconverges and a unique root bridge for the 802.1D segment, and a root

bridge for the 802.1w segment, is chosen.

D. The first hop 802.1w switch that is connected to the 802.1D runs entirely in 802.1D compatibility

mode and converts the BPDUs to either 802.1D or 802.1w BPDUs to the 802.1D or 802.1w

segments of the network.

E. Classic 802.1D timers, such as forward delay and max-age, will only be used as a backup, and

will not be necessary if point-to-point links and edge ports are properly identified and set by the

administrator.

Answer: B,E

Explanation:

Each port maintains a variable that defines the protocol to run on the corresponding segment. A

migration delay timer of three seconds also starts when the port comes up. When this timer runs,

the current STP or RSTP mode associated to the port is locked. As soon as the migration delay

expires, the port adapts to the mode that corresponds to the next BPDU it receives. If the port

changes its mode of operation as a result of a BPDU received, the migration delay restarts.

802.1D works by the concept that the protocol had to wait for the network to converge before it

transitioned a port into the forwarding state. With Rapid Spanning Tree it does not have to rely on

any timers, the only variables that that it relies on is edge ports and link types.

Any uplink port that has an alternate port to the root can be directly placed into the forwarding

state (This is the Rapid convergence that you speak of “restored quickly when RSTP is already in

use?”). This is what happened when you disconnected the primary look; the port that was ALT,

moved to FWD immediately, but the switch also still needs to create a BDU with the TC bit set to

notify the rest of the network that a topology has occurred and all non-edge designated ports will

transition to BLK, LRN, and then FWD to ensure there are no loops in the rest of the network. This

is why if you have a host on a switchport, and you know for a fact that it is only one host, enable

portfast to configure the port as an edgeport so that it does not have to transition to all the STP

states.

Reference

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml

QUESTION NO:10

Which command is used to enable EtherChannel hashing for Layer 3 IP and Layer 4 port-based

CEF?

A. mpls ip cef

B. port-channel ip cef

C. mpls ip port-channel cef

D. port-channel load balance

E. mpls ip load-balance

F. ip cef EtherChannel channel-id XOR L4

G. ip cef connection exchange

Answer: D

Explanation:

400-101 Study Guide400-101 Exam Questions400-101 Braindumps

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:

QUESTION NO:18

Refer to the exhibit.

Which statement is correct about the prefix 160.0.0.0/8?

A. The prefix has encountered a routing loop.

B. The prefix is an aggregate with an as-set.

C. The prefix has been aggregated twice, once in AS 100 and once in AS 200.

D. None of these statements is true.

Answer: B

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:30

What is the flooding scope of an OSPFv3 LSA, if the value of the S2 bit is set to 1 and the S1 bit is

set to 0?

A. link local

B. area wide

C. AS wide

D. reserved

Answer: C

Explanation:

The Type 1 router LSA is now link local and the Type 2 Network LSA is AS Wide

S2 and S1 indicate the LSA’s flooding scope. Table 9-1 shows the possible values of these two

bits and the associated flooding scopes.

Table 9-1 S bits in the OSPFv3 LSA Link State Type field and their associated flooding scopes

LSA Function Code, the last 13 bits of the LS Type field, corresponds to the OSPFv2 Type field.

Table 9-2 shows the common LSA types used by OSPFv3 and the values of their corresponding

LS Types. If you decode the hex values, you will see that the default U bit of all of them is 0. The S

bits of all LSAs except two indicate area scope. Of the remaining two, AS External LSAs have an

AS flooding scope and Link LSAs have a linklocal flooding scope. Most of the OSPFv3 LSAs have

functional counterparts in OSPFv2; these OSPFv2 LSAs and their types are also shown in Table

9-2.

Table 9-2 OSPFv3 LSA types and their OSPFv2 counterparts

Reference

http://www.networkworld.com/subnets/cisco/050107-ch9-ospfv3.html?page=1

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