Cisco 642-883 Exam Questions

Question 6 of 191

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

To modify the administrative distance of the OSPF routes

To modify the default seed metric of the OSPF external routes

To modify the OSPF default reference bandwidth

To modify the OSPF cost

Correct Answer: A

http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.8/routing/command/reference/rr38ospf.pdf
Exam 642-883: Question 6 - Image 1

Question 7 of 191

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

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

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

IS-IS supports "route leaking" in which selected Level 2 routes can be advertisedby a Level 1/Level 2 router into Level 1.

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

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

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

Correct Answer: A, C, E, F

Question 8 of 191

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

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

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

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

By default,metric-style narrow is used.

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

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

Correct Answer: B, D, E

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.
Exam 642-883: Question 8 - Image 2

BDE

Question 9 of 191

Refer to the PE1 router routing table output exhibit.
Exam 642-883: Question 9 - Image 1

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?

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

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

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

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

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

Question 10 of 191

In comparing IS-IS with OSPF, a Level-1-2 IS-IS router is similar to which kind of OSPF router?

ASBR on a normal OSPF area

ASBR on NSSA

ABR on totally stubby OSPF area

ABR on stubbyOSPF area

ABR on a normal OSPF area

Correct Answer: C