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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 Introduction Exam Topics Recommended Training Additional Resources
Exam Description Introduction
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.
Preparing for the 642-901 exam? Searching 642-901 Test Questions, 642-901 Practice Exam, 642-901 Dumps?

QUESTION 16:
DRAG DROP
Match the correct EIGRP term on the left to the slot in the middle that is adjacent
to the correct description on the right.
Answer:
Explanation:
Neighbor table – lists adjacent routers
Topology Table – route entries for all destinations.
Successor – primary route used to reach a destination
Routing table – best routes to a destination
Feasible successor – backup route to the destination.
Explanation:
* Neighbor Table – Each EIGRP router maintains a neighbor table that lists adjacent
routers. This table is comparable to the neighbors (adjacency) database used by OSPF.
* Topology Table – An EIGRP router maintains a topology table for each network
protocol configured: IP, IPX, and AppleTalk. All learned routes to a destination are
maintained in the topology table.
* Routing Table – EIGRP choose the best routes to a destination from the topology table
and places these routes in the routing table. The router maintains one routing table for
each network protocol.
* Successor – This is the primary route used to reach a destination. Successors are kept in
the routing table.
* Feasible Successor – This is a neighbor that is downstream with respect to the
destination, but it is not the least-cost path and thus is not used for forwarding data. In
other words, this is a backup route to the destination. These routes are selected at the
same time as successors, but are kept in the topology table.
Reference: Building Scalable Cisco Networks (Cisco Press) page 250
642-901
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QUESTION 17:
Different types of EIGRP transmissions are sent between neighboring routers.
Which three of the following terms are known as ‘reliable packets’ in EIGRP?
(Select three)
A. Hello
B. ACK
C. Reply
D. Query
E. Update
Answer: C, D, E
Explanation:
Updates are used to convey the reachability of destinations. When a new neighbor is
discovered, update packets are sent so the neighbor can build up its topology table. In this
case, update packets are unicast. In other cases, such as a link cost change, updates are
multicast. Updates are always transmitted reliably.
Queries and replies are sent when destinations go into Active state. Queries are always
multicast unless they are sent in response to a received query. In this case, it is unicast
back to the successor that originated the query. Replies are always sent in response to
queries to indicate to the originator that it does not need to go into Active state because it
has feasible successors. Replies are unicast to the originator of the query. Both queries
and replies are transmitted reliably.
EIGRP reliable packets are: Update, Query and Reply.
EIGRP unreliable packets are: Hello and Ack.
Incorrect Answers:
A, B: Hellos are multicast for neighbor discovery/recovery. They do not require
acknowledgment. A hello with no data is also used as an acknowledgment (ack). Acks
are always sent using a unicast address and contain a non-zero acknowledgment number.
Reference: Cisco BSCN version 1.0 study guide, pages 6-18.
QUESTION 18:
Which one of the following statements best describes the way EIGRP advertises
subnet mask information to its destination networks?
A. EIGRP advertises a prefix length for each destination network.
B. EIGRP advertises a fixed length subnet mask for each destination network.
C. EIGRP advertises only a classful subnet mask for each destination network.
D. EIGRP, like IGRP and RIP, does not advertise a subnet mask for each destination
network.
Answer: A
642-901
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Explanation:
EIGRP advertises a prefix length to each destination network. It supports VLSM which
allows subnet masks to be automatically summarized at the network boundary, and
EIGRP can also be configured to summarize on any bit boundary at any interface.
Incorrect Answers:
B: This is incorrect because EIGRP supports Variable Length subnet masks.
C: This is incorrect because EIGRP is considered to be a classless protocol, not classful.
D: EIGRP is more sophisticated then IGRP and RIP and actually does advertise a subnet
mask to each destination network.
QUESTION 19:
EIGRP was designed specifically not to use excessive bandwidth for routing updates
and functions across WAN links. If EIGRP is configured on an interface, what is the
maximum percent of its bandwidth EIGRP would use, by default?
A. 10%
B. 25%
C. 50%
D. 75%
E. 100%
Answer: C
Explanation:
By default, EIGRP will limit itself to using no more than 50% of the available
bandwidth. The maximum bandwidth that can be used is a configurable parameter.
Reference: Cisco, Configuration Notes for the Enhanced Implementation of EIGRP.

http://www.cisco.com/warp/public/103/12.html

QUESTION 20:
EIGRP supports Variable Length Subnet Masking (VLSM). Which two features of
EGIRP are true regarding EIGRP support for VLSM? (Select two)
A. It advertises a routing mask
B. It is a classful routing protocol
C. It is a classless routing protocol
D. It does not advertise a routing mask.
Answer: A, C

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