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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:19

Which two options does Cisco PfR use to control the entrance link selection with inbound

optimization? (Choose two.)

A. Prepend extra AS hops to the BGP prefix.

B. Advertise more specific BGP prefixes (longer mask).

C. Add (prepend) one or more communities to the prefix that is advertised by BGP.

D. Have BGP dampen the prefix.

Answer: A,C

Explanation: PfR Entrance Link Selection Control Techniques

The PfR BGP inbound optimization feature introduced the ability to influence inbound traffic. A

network advertises reachability of its inside prefixes to the Internet using eBGP advertisements to

its ISPs. If the same prefix is advertised to more than one ISP, then the network is multihoming.

PfR BGP inbound optimization works best with multihomed networks, but it can also be used with

a network that has multiple connections to the same ISP. To implement BGP inbound

optimization, PfR manipulates eBGP advertisements to influence the best entrance selection for

traffic bound for inside prefixes. The benefit of implementing the best entrance selection is limited

to a network that has more than one ISP connection.

To enforce an entrance link selection, PfR offers the following methods:

BGP Autonomous System Number Prepend When an entrance link goes out-of-policy (OOP) due

to delay, or in images prior to Cisco IOS Releases 15.2(1) T1 and 15.1(2)S, and PfR selects a

best entrance for an inside prefix, extra autonomous system hops are prepended one at a time (up

to a maximum of six) to the inside prefix BGP advertisement over the other entrances. In Cisco

IOS Releases 15.2(1)T1, 15.1(2)S, and later releases, when an entrance link goes out-of policy

(OOP) due to unreachable or loss reasons, and PfR selects a best entrance for an inside prefix,

six extra autonomous system hops are prepended immediately to the inside prefix BGP

advertisement over the other entrances. The extra autonomous system hops on the other

entrances increase the probability that the best entrance will be used for the inside prefix. When

the entrance link is OOP due to unreachable or loss reasons, six extra autonomous system hops

are added immediately to allow the software to quickly move the traffic away from the old entrance

link. This is the default method PfR uses to control an inside prefix, and no user configuration is

required.

BGP Autonomous System Number Community Prepend

When an entrance link goes out-of-policy (OOP) due to delay, or in images prior to Cisco IOS

Releases 15.2

(1)T1 and 15.1(2)S, and PfR selects a best entrance for an inside prefix, a BGP prepend

community is attached one at a time (up to a maximum of six) to the inside prefix BGP

advertisement from the network to another autonomous system such as an ISP. In Cisco IOS

Releases 15.2(1)T1, 15.1(2)S, and later releases, when an entrance link goes out-of-policy (OOP)

due to unreachable or loss reasons, and PfR selects a best entrance for an inside prefix, six BGP

prepend communities are attached to the inside prefix BGP advertisement. The BGP prepend

community will increase the number of autonomous system hops in the advertisement of the

inside prefix from the ISP to its peers. Autonomous system prepend BGP community is the

preferred method to be used for PfR BGP inbound optimization because there is no risk of the

local ISP filtering the extra autonomous system hops. There are some issues, for example, not all

ISPs support the BGP prepend community, ISP policies may ignore or modify the autonomous

system hops, and a transit ISP may filter the autonomous system path. If you use this method of

inbound optimization and a change is made to an autonomous system, you must issue an

outbound reconfiguration using the “clear ip bgp” command.

Reference

http://www.cisco.com/en/US/docs/ios-xml/ios/pfr/configuration/15-2s/pfr-bgp-inbound.html#GUID-

F8A59E241D59-

4924-827D-B23B43D9A8E0

http://www.cisco.com/en/US/products/ps8787/products_ios_protocol_option_home.html

QUESTION NO:37

Which command can be used on a PE router to connect to a CE router (11.1.1.4) in VRF red?

A. telnet 11.1.1.4 /vrf-source red

B. telnet 11.1.1.4 source /vrf red

C. telnet 11.1.1.4 /source vrf red

D. telnet 11.1.1.4 /vrf red

E. telnet 11.1.1.4 vrf red

Answer: D

Explanation:

Telnetting can be done through the VRF using the Management Ethernet interface. In the

following example, the router telnets to 172.17.1.1 through the Management Ethernet interface

VRF:

Router# telnet 172.17.1.1 /vrf Mgmt-intf

Reference

http://www.cisco.com/en/US/docs/routers/asr1000/configuration/guide/chassis/Management_Ether

net.html

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: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:41

On a router, interface S0 is running EIGRPv6, and interface S1 is running OSPFv3. A

redistribution command is issued under OSPFv3, redistribute EIGRP 1 metric 20 under ipv6 router

ospf 1. What will happen after applying this redistribution command?

A. All routes showing up as D and D EX in the routing table will be redistributed into OSPFv3.

B. All routes showing up as D, D EX, and C in the routing table will be redistributed into OSPFv3.

C. All routes showing up as D and D EX in the routing table and the S0 interface will be

redistributed into OSPFv3.

D. All routes showing up as D in the routing table will be redistributed into OSPFv3.

E. All routes showing up as D EX in the routing table will be redistributed into OSPFv3.

Answer: A

Explanation:

D are EIGRP Internal Routes and D EX are EIGRP external routes. Both Internal and External

EIGRP routes will be redistributed with the configuration shown above

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: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: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:

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