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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: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

400-101 PDF Dumps400-101 VCE Dumps400-101 Study Guide

QUESTION NO:23

What action will a BGP route reflector take when it receives a prefix marked with the community

attribute NO ADVERTISE from a client peer?

A. It will advertise the prefix to all other client peers and non-client peers.

B. It will not advertise the prefix to EBGP peers.

C. It will only advertise the prefix to all other IBGP peers.

D. It will not advertise the prefix to any peers.

Answer: D

Explanation:

QUESTION NO:27

Refer to the exhibit.

What triggered the first SPF recalculation?

A. changes in a router LSA, subnet LSA, and external LSA

B. changes in a router LSA, summary network LSA, and external LSA

C. changes in a router LSA, summary network LSA, and summary ASBR LSA

D. changes in a router LSA, summary ASBR LSA, and external LSA

Answer: B

Explanation:

OSPFv2

Is built around links, and any IP prefix change in an area will trigger a full SPF. It advertises IP

information in Router and Network LSAs. The routers thus, advertise both the IP prefix information

(or the connected subnet information) and topology information in the same LSAs. This implies

that if an IP address attached to an interface changes, OSPF routers would have to originate a

Router LSA or a Network LSA, which btw also carries the topology information. This would trigger

a full SPF on all routers in that area, since the same LSAs are flooded to convey topological

change information. This can be an issue with an access router or the one sitting at the edge,

since many stub links can change regularly.

Only changes in interarea, external and NSSA routes result in partial SPF calculation (since type

3, 4, 5 and 7 LSAs only advertise IP prefix information) and thus IS-IS

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:

QUESTION NO:35

Which command will define a VRF with name ‘CCIE’ in IPv6?

A. ip vrf CCIE

B. ipv6 vrf CCIE

C. vrf definition CCIE

D. ipv6 vrf definition CCIE

Answer: C

Explanation:

QUESTION NO:39

Which two statements are correct about Nonstop Forwarding? (Choose two.)

A. It allows the standby RP to take control of the device after a hardware or software fault on the

active RP.

B. It is a Layer 3 function that works with SSO to minimize the amount of time a network is

unavailable to users following a switchover.

C. It is supported by the implementation of EIGRP, OSPF, RIPv2, and BGP protocols.

D. It synchronizes startup configuration, startup variables, and running configuration.

E. The main objective of NSF is to continue forwarding IP packets following a switchover.

F. Layer 2 802.1w or 802.1s must be used, as 802.1d cannot process the Layer 2 changes.

G. Routing protocol tuning parameters must be the same as the NSF parameters, or failover will

be inconsistent.

Answer: B,E

Explanation: Explanation

Cisco Nonstop Forwarding (NSF) works with the Stateful Switchover (SSO) feature in Cisco IOS

software. NSF works with SSO to minimize the amount of time a network is unavailable to its

users following a switchover. The main objective of Cisco NSF is to continue forwarding IP

packets following a Route Processor (RP) switchover.

Reference

http://www.cisco.com/en/US/docs/ios/12_2s/feature/guide/fsnsf20s.html

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