Testinside cisco CCNP 642-901

BSCI – Building Scaleable Cisco Internetworks : 642-901 Exam

642-901 BSCI
Building Scalable Cisco Internetworks

Exam Number: 642-901
Associated Certifications: CCNP, CCIP, CCDP
Duration: 90 minutes
Available Languages: English
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Exam Description Exam Topics Recommended Training Additional Resources
Exam Description
The Building Scalable Cisco Internetworks (BSCI 642-901) is a qualifying exam for the Cisco Certified Network Professional CCNP®, Cisco Certified Design Professional CCDP®, and Cisco Certified Internetwork Professional CCIP™ certifications. The BSCI 642-901 exam will certify that the successful candidate has important knowledge and skills necessary to use advanced IP addressing and routing in implementing scalability for Cisco ISR routers connected to LANs and WANs. The exam covers topics on Advanced IP Addressing, Routing Principles, Multicast Routing, IPv6, Manipulating Routing Updates, Configuring basic BGP, Configuring EIGRP, OSPF, and IS-IS.

Exam Topics
The following information provides general guidelines for the content likely to be included on the exam. However, other related topics may also appear on any specific delivery of the exam. In order to better reflect the contents of the exam and for clarity purposes the guidelines below may change at any time without notice.

Implement EIGRP operations.
Explain the functions and operations of EIGRP (e.g., DUAL).
Configure EIGRP routing. (e.g., Stub Routing, authentication, etc.)
Verify or troubleshoot EIGRP routing configurations.

Implement multiarea OSPF operations.
Explain the functions and operations of multiarea OSPF.
Configure multiarea OSPF routing. (e.g., Stub, NSSA, authentication, etc.)
Verify or troubleshoot multiarea OSPF routing configurations.

Describe integrated IS-IS.
Describe the features and benefits of integrated IS-IS.
Configure and verify integrated IS-IS.

Implement Cisco IOS routing features.
Describe, configure or verify route redistribution between IP routing IGPs. (e.g., route-maps, default routes, etc.)
Describe, configure or verify route filtering (i.e., distribute-lists and passive interfaces).
Describe and configure DHCP services (e.g., Server, Client, IP helper address, etc.).

Implement BGP for enterprise ISP connectivity
Describe the functions and operations of BGP.
Configure or verify BGP operation in a non-transit AS (e.g., authentication).
Configure BGP path selection. (i.e., Local Preference, AS Path, Weight or MED attributes).

Implement multicast forwarding.
Describe IP Multicast (e.g., Layer-3 to Layer-2 mapping, IGMP, etc.).
Describe, configure, or verify IP multicast routing (i.e., PIM Sparse-Dense Mode).

Implement IPv6.
Describe IPv6 addressing operations.
Describe IPv6 interoperation with IPv4.
Describe, configure or verify OSPF routing with IPv6 addressing.

“Building Scalable Cisco Internetworks”, also known as 642-901 exam, is a Cisco certification.
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QUESTION 21:
In an effort to decrease the size of the routing tables in the Certkiller network,
summarization is being configured on all routers. Where in an EIGRP network is it
most appropriate to implement route summarization?
A. At area border routers
B. At autonomous system boundary routers
C. It is done automatically by the DR router in each area
D. Manually at any interface of any EIGRP router within the network
E. In backbone area routers.
Answer: B
Explanation:
Enhanced IGRP performs route summarization at classful network boundaries by default.
Automatic route summarization occurs at major network boundaries. ASBRs
(autonomous system boundary routers) are used at the major network boundaries.
Incorrect Answers
A, C, E: Area Border Router and DR are used in OSPF, but not in EIGRP. Backbone area
routers are also concepts used in OSPF, but not in EIGRP.
D: Manual summarization can be done in any interface at any router within network, but
this is not the preferred solution. Summarizing manually at each router can result in black
hole routing. However, done properly this is an acceptable practice. If the question calls
for more than one answer then the best choice would be B and D.
QUESTION 22:
The Certkiller network is using route summarization to decrease the size of the
routing tables. In an EIGRP network, which of the following describes the best
method for implementing summarization?
A. At WAN interfaces.
B. Manually at major network boundaries.
C. Dynamically at discontiguous interfaces.
D. Dynamically at major network boundaries.
Answer: D
Explanation:

EIGRP supports arbitrary route summarization. Route summarization takes place
automatically at major network boundaries (where network are supernetted).
Note: Route summarization is the consolidation of advertised addresses.
Incorrect Answers
A: Manually configuring summarization at WAN boundaries is not necessarily
recommended in all situations. If the routers belong to the same major network boundary
then summarization should not be configured.
B: Route summarization is automatic in EIGRP, and it is recommended to keep the
defaults.
C: Route summarization should only be applied at contiguous interfaces. Choosing this
option would most likely lead to black hole routing, making many networks unreachable.
QUESTION 23:
The Certkiller network is running EIGRP on the T1 links within their NBMA frame
relay network. By default what would the hold time be for hello packets across these
WAN links?
A. 30 seconds
B. 60 seconds
C. 90 seconds
D. 180 seconds
E. 5 Seconds
Answer: D

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