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 Published Date: 01/12/2017

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QUESTION NO:3

On Cisco IOS XR Software, which set of commands is used to enable the gi0/0/0/1 interface for OSPF in area 0?

A. interface gi0/0/0/0ip address 10.1.1.1 255.255.255.0!router ospf 1network 10.1.1.1 0.0.0.0 area 0

B. interface gi0/0/0/0ip address 10.1.1.1 255.255.255.0!router ospf 1network 10.1.1.1 255.255.255.255 area 0

C. router ospf 1area 0interface GigabitEthernet0/0/0/1

D. interface gi0/0/0/0ip address 10.1.1.1 255.255.255.0ip ospf 1 area 0

E. router ospf 1address-family ipv4 unicastinterface GigabitEthernet0/0/0/1 area 0

F. router ospf 1address-family ipv4 unicastinterface GigabitEthernet0/0/0/1area 0

Correct Answer: C Explanation

Explanation/Reference:

Explanation:

QUESTION NO:17

When implementing OSPF, which type of networks require DR/BDR election?

A. point-to-point networks

B. mutli-access broadcast networks

C. non-broadcast multi-access networks (Hub and Spoke Frame Relay) using point-to-multipoint OSPF network type

D. All networks type

Correct Answer: B Explanation Explanation/Reference:

Explanation:

QUESTION NO:1

Refer to the OSPF command exhibit.

Which effect does the no-summary command option have?

A. It will cause area 1 to be able to receive non-summarized inter-area routes.

B. It will cause area 1 to not receive any inter-area routes and will use a default route to reach networks in other areas.

C. It will cause area 1 to not receive any external routes and will use a default route to reach the external networks.

D. It will convert the NSSA area into a NSSA totally stubby area.

E. It will convert the stubby area into a NSSA.

F. It will disable OSPF auto-summary.

Correct Answer: B Explanation

Explanation/Reference:

Explanation:

QUESTION NO:8

When configuring IPv4 and IPv6 IS-IS routing on Cisco IOS XR routers, which three statements are correct? (Choose three.)

A. By default, a single SPF is used for both IPv4 and IPv6, so the IPv4 and IPv6 topology should be the same.

B. By default, the IS-IS router type is Level 1 and Level 2.

C. All IS-IS routers within the same IS-IS area must be configured with the same IS-IS routing process instance ID.

D. By default, metric-style narrow is used.

E. By default, the IS-IS interface circuit type is Level 1 and Level 2.

F. The area IS-IS address-family configuration command is used to specify the IS-IS area address.

Correct Answer: BDE Explanation

Explanation/Reference:

Explanation:

The default metric style for single topology is narrow metrics. However, you can use either wide metrics or narrow metrics. How to configure them depends upon how single-topology is configured. If both IPv4 and IPv6 are enabled and single-topology is configured, the metric style is configured in the address-family ipv4 stanza. You may configure the metric style in the address-family ipv6 stanza, but it will be ignored in this case. If IPv6 only is enabled and single topology is configured, then the metric style is configured in the address-family ipv6 stanza.

QUESTION NO:23

What is recursive lookup in BGP and how does it work?

A. The router looks up the EBGP route and the EBGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the EBGP next hop using the IBGP.

B. The router looks up the IBGP route and the IBGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the IBGP next hop using the EBGP.

C. The router looks up the BGP route and the BGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the BGP next hop using the IGP.

D. The router looks up the route and the next hop to reach a destination in the remote AS using the IGP. Then the router looks up the route to reach the next hop using BGP.

E. The router perform three routing lookups to determine the route to reach a destination in the remote AS. The first lookup is done using EBGP, the second lookup is done using IBGP, and the third lookup is done using the IGP.

Correct Answer: C Explanation

Explanation/Reference:

Explanation:

A few different approaches are available to deal with iBGP and synchronization. We may turn on the synchronization option on our routers and wait for the IGP to have a route for the destination before it\’s advertised to peers. Another option is to simply use a full mesh, so that iBGP convergence isn\’t an issue. Clearly that isn\’t going to happen when a network\’s core needs to scale: it will implement something like reflectors that cause iBGP\’s full mesh to be broken. The real alternative, if you don\’t enable synchronization, is to use route recursion. A recursive route lookup uses the BGP next-hop attribute to actually make a different route lookup. The IGP can use the destination network instead of the AS-path to determine where it gets sent. Even if the iBGP hasn\’t converged, the routers will still know how to get to that network, since it will exist in the router it was advertised from, who will know the next-hop.

QUESTION NO:15

In which network environment is IS-IS adjacency check important?

A. in a multitopology environment where there are different instances of IS-IS running on the same router

B. in an IPv4/IPv6 environment and running single-topology IS-IS

C. when a level L1/L2 IS-IS router is neighboring with a Level 1 only or Level 2 only router

D. when IS-IS neighbors are in an NBMA environment like over Frame Relay

E. when IS-IS neighbors are in a broadcast environment like an Ethernet LAN Correct Answer: B

Explanation Explanation/Reference:

Explanation:

QUESTION NO:9

Refer to the PE1 router routing table output exhibit.

What is causing the i su 10.1.10.0/24 [115/30] via 0.0.0.0, 00:40:34, Null0 entry on the PE1 router routing table?

A. The PE1 router is receiving the 10.1.10.0/24 summary route from the upstream L1/L2 IS-IS router.

B. The PE1 router has been configured to summarize the 10.1.10.x/32 IS-IS routes to 10.1.10.0/24.

C. The 10.1.10.0/24 has been suppressed because IS-IS auto-summary has been disabled on the PE1 router.

D. The 10.1.10.0/24 has been suppressed because of a route policy configuration on the PE1 router.

E. The 10.1.10.0/24 has been suppressed because the more specific 10.1.10.x/32 IS-IS routes have been configured to leak into the IS-IS non-backbone area.

Correct Answer: B Explanation

Explanation/Reference:

Explanation:

QUESTION NO:2

When troubleshooting OSPF neighbor errors, which three verification steps should be considered? (Choose three.)

A. Verify if neighboring OSPF interfaces are configured in the same area.

B. Verify if neighboring OSPF interfaces are configured with the same OSPF process ID.

C. Verify if neighboring OSPF interfaces are configured with the same OSPF priority.

D. Verify if neighboring OSPF interfaces are configured with the same hello and dead intervals.

E. Verify if neighboring OSPF interfaces are configured with the same area type.

Correct Answer: ADE Explanation

Explanation/Reference:

Explanation:

QUESTION NO:12

Refer to the exhibit.

Which two configuration options can be used to optimize the IS-IS network scenario? (Choose two.)

A. Change the R1 and R2 IS type to Level 2.

B. Change the R1 and R2 IS type to Level 1.

C. Change the gi0/0 interface IS-IS circuit type on R1 and R2 to Level 2 only.

D. Change the gi0/1 interface IS-IS circuit type on R1and R2 to Level 1.

E. Change the IS type for all the routers to Level-1-2.

F. Change the IS-IS network type for all the routers to point-to-point.

Correct Answer: CD Explanation

Explanation/Reference:

Explanation:

QUESTION NO:13

The Cisco IOS XE Software summary-address router IS-IS configuration command can be used to send a summarized route into which IS-IS hierarchy?

A. Level 1 only

B. Level 2 only

C. Level-1-2 only

D. Level 1 or Level 2 or Level-1-2

Correct Answer: D Explanation Explanation/Reference:

Explanation:

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