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 Published Date: 02/04/2017

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QUESTION NO:16

Refer to the IS-IS configuration exhibit.

This is the typical IS-IS configuration of the routers in an AS using IS-IS as the IGP. This AS is in the transition phase of integrating IPv6 into the network. During this transition phase, some of the routers within the AS might be running IPv4 only, some might be running IPv6 only, and others might be running both IPv4 and IPv6. To avoid any black holes for the IPv6 traffic, which configuration change can be made?

A. Disable IS-IS adjacency checks.

B. Enable IPv6 adjacency over IPv4 IS-IS peering.

C. Enable multi-topology IS-IS.

D. Disable the IPv4 unicast address-family.

E. Enable IS-IS wide metric to support the single-topology mode. Correct Answer: C

Explanation Explanation/Reference:

Explanation:

QUESTION NO:14

Refer to the Cisco IOS XE IS-IS configuration exhibit.

What are two problems with the configuration that are causing the IPv4, or the IPv6, or the IPv4 and IPv6 IS-IS operations to fail? (Choose two.)

A. The configuration is missing the interface gi0/0 and interface gi0/0 commands under router isis 1.

B. The configuration is missing the address-family ipv4 unicast and address-family ipv6 unicast commands under router isis 1.

C. IPv6 unicast routing has not been enabled globally on the Cisco IOS XE router.

D. The gi0/0 and gi0/1 interfaces are not participating in the router isis 1 routing instance.

E. Multitopology IS-IS must be enabled to support both IPv4 and IPv6.

F. Another router isis instance must be enabled to support IPv6.

Correct Answer: CD Explanation Explanation/Reference:

Explanation: http://www.cisco.com/en/US/docs/switches/metro/me3400/software/release/12.2_50_se/configuration/ guide/swipv6.pdf

QUESTION NO:11

Refer to the topology diagram in the exhibit.

Which IS-IS feature could be implemented so that the return path for the packets from router Y in area 49.00AA to router X in area 49.00BB will use the more optimal path?

A. Enable route leaking to pass Level 2 information into the Level 1 routers.

B. Change the area 49.00AA type from a stub area to a regular area.

C. Change the IS-IS administrative distance on router Y in area 49.00AA.

D. Change the IS-IS metric type from narrow to wide on all IS-IS routers.

Correct Answer: A Explanation

Explanation/Reference:

Explanation:

http://www.cisco.com/application/pdf/paws/13796/route-leak.pdf

The IS-IS routing protocol allows for a two-level hierarchy of routing information. There can be multiple Level 1 areas interconnected by a contiguous Level 2 backbone. A router can belong to Level 1, Level 2, or both. The Level 1 link-state database contains information about that area only. The Level 2 link-state database contains information about that level as well as each of the Level 1 areas. An L1/L2 router contains both Level 1 and Level 2 databases. It advertises information about the L1 area to which it belongs into L2. Each L1 area is essentially a stub area. Packets destined for an address that is outside of the L1 area are routed to the closest L1/L2 router to be forwarded on to the destination area. Routing to the closest L1/L2 router can lead to sub-optimal routing when the shortest path to the destination is through a different L1/L2 router. Route leaking helps reduce sub-optimal routing by providing a mechanism for leaking, or redistributing, L2 information into L1 areas. By having more detail about inter area routes, an L1 router is able to make a better choice with regard to which L1/L2 router to forward the packet.

QUESTION NO:7

Which four statements are correct regarding IS-IS operations? (Choose four.)

A. By default, Level 1 routers within an IS-IS area do not carry any routing information external to the area to which they belong. They use a default route to exit the area.

B. Summarization should be configured on the Level 2 routers, which injects the Level 2 routes into Level 1.

C. IS-IS supports “route leaking” in which selected Level 2 routes can be advertised by a Level 1/Level 2 router into Level 1.

D. The IS-IS backbone is a contiguous collection of Level 1 capable routers, each of which can be in a different area.

E. With IS-IS, an individual router is in only one area, and the border between areas is on the link that connects two routers that are in different areas.

F. Cisco IOS XR Software supports multitopology for IPv6 IS-IS unless single topology is explicitly configured in IPv6 address-family configuration mode.

Correct Answer: ACEF Explanation

Explanation/Reference:

Explanation:

http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.0/routing/configuration/guide/rc3isis.html#wp11 48617

Single-Topology IPv6 Support

Single-topology IPv6 support on Cisco IOS XR software allows IS-IS for IPv6 to be configured on interfaces along with an IPv4 network protocol. All interfaces

must be configured with the identical set of network protocols and all routers in the IS-IS area (for Level 1 routing) or the domain (for Level 2 routing) must support

the identical set of network layer protocols on all interfaces.

When single-topology support for IPv6 is used, only narrow link metrics, also known as old-style type, length, value (TLV) arguments, may be employed. During

single-topology operation, one shortest path first (SPF) computation per level is used to compute both IPv4 and IPv6 routes. Using a single SPF is possible

because both IPv4 IS-IS and IPv6 IS-IS routing protocols share a common link topology. Because multitopology is the default behavior in the software, you must

explicitly configure IPv6 to use the same topology as IPv4 in order to enable single-topology IPv6. Configure the single-topology command in ipv6 address family

configuration submode of the IS-IS router stanza.

Multitopology IPv6 Support

Multitopology IPv6 support on Cisco IOS XR software differs from Cisco IOS software in that IS-IS assumes that multitopology support is required as soon as it

detects interfaces configured for both IPv6 and IPv4 within the IS-IS stanza.

You must use the metric-style wide command to configure IS-IS to wide link metrics as multitopology link advertisements.

QUESTION NO:19

What are two purposes of the BGP scan-time command? (Choose two.)

A. to tune the BGP process which walks the BGP table and confirms the reachability of next hops

B. to allow faster detection of downed BGP peers

C. to improve BGP convergence time

D. to tune the BGP update interval

E. to decrease the effects of unstable routes by increasing the route suppression time

Correct Answer: AC Explanation

Explanation/Reference:

Explanation:

http://www.networkers-online.com/blog/2008/12/bgp-performance-tunning-convergence-stability- scalabilityand-nsf-part-2/

Background BGP scanner

It is responsible for BGP housekeeping by scanning both the BGP RIB and the IP RIB and cleaning and sorting things out.

BGP monitors the next hop of the installed routes to verify next-hop reachability and to select, install, and validate the BGP best path. By default, the BGP scanner

polls the RIB for this information every 60 seconds.

During the 60 second time period between scan cycles, IGP instabilities or other network failures can cause temporarily black holes and routing loops.

NOTE With Cisco IOS the default timer is 60 seconds for the IPv4 address family and 15 seconds for the

VPNv4 address family in order to optimize the VPNs routing table convergence.

This timer can be controlled via the following command:

Router(config-router)#bgp scan-time

QUESTION NO:6

What is function of the RP/0/RSP0/CPU0:PE1(config-ospf)#distance Cisco IOS-XR command?

A. To modify the administrative distance of the OSPF routes

B. To modify the default seed metric of the OSPF external routes

C. To modify the OSPF default reference bandwidth

D. To modify the OSPF cost Correct Answer: A

Explanation Explanation/Reference:

Explanation: http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.8/routing/command/reference/rr38ospf.pdf

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: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:20

When using the show bgp ipv6 unicast summary command to verify the IPv6 BGP session status with the IPv6 BGP peers, you noticed the “St/PfxRcd” status for one of the IPv6 BGP peers is in the “Active” state. What does the “Active” state indicate?

A. The IPv6 BGP session has been established with the IPv6 BGP peer.

B. The router is in the process of sending BGP routing updates to the IPv6 BGP peer.

C. The router is in the process of establishing the IPv6 BGP session with the IPv6 BGP peer.

D. The router is exchanging BGP notification messages with its IPv6 BGP peer.

Correct Answer: C 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:

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