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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:

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:24

Refer to the exhibit.

R1 is not learning about the 172.16.10.0 subnet from the BGP neighbor R2 (209.165.202.130).

What can be done so that R1 will learn about this network?

A. Disable auto-summary on R2.

B. Configure an explicit network command for the 172.16.10.0 subnet on R2.

C. Subnet information cannot be passed between IBGP peers.

D. Disable auto-summary on R1.

Answer: B

Explanation:

By default, BGP does not accept subnets redistributed from IGP. To advertise and carry subnet

routes in BGP, use an explicit network command or the no auto-summary command. If you disable

auto-summarization and have not entered a network command, you will not advertise network

routes for networks with subnet routes unless they contain a summary route.

Reference

http://www.cisco.com/en/US/docs/ios/11_3/np1/command/reference/1rbgp.html

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: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

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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

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: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: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

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:

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