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.

Exam Number/Code: 642-901
Exam Name:BSCI – Building Scaleable Cisco Internetworks

“BSCI – Building Scaleable Cisco Internetworks”, also known as 642-901 exam, is a Cisco certification. With the complete collection of questions and answers, Actualtests has assembled to take you through 353 Q&As to your 642-901 Exam preparation. In the 642-901 exam resources, you will cover every field and category in CCNP helping to ready you for your successful Cisco Certification.
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Exam DetailsThe 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.

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QUESTION 11:
A link failure in the Certkiller network has caused the EIGRP routers to update
their routing tables. What action does an EIGRP router take when it cannot find a
feasible successor for a network?
A. It examines the topology table for a next best path.
B. It transitions from passive to active state for that network and queries its neighbors.
C. It examines the routing and neighbor tables for the next best path.
D. It transitions from active to passive state for that network and queries its neighbors.
E. None of the above
Answer: B
Explanation:
* Successor – A successor is a route selected as the primary route to use to reach a
destination. Successors are the entries kept in the routing table. Multiple successors for a
destination can be retained in the routing table.
* Feasible successor – A feasible successor is a backup route. These routes are selected
at the same time the successors are identified, but are kept in the topology table. Multiple
feasible successors for a destination can be retained in the topology table.
QUESTION 12:
EIGRP performs automatic summarization at network boundaries. What
administrative distance is given to EIGRP summary routes?
A. 1
B. 90
C. 95
D. 0
E. 5
F. 170
G. 255
H. None of the above
Answer: E
Explanation:
EIGRP automatically summarizes routes at the classful boundary, the boundary where
the network address ends as defined by class-based addressing. In most cases, auto
summarization is a good thing, keeping the routing tables as compact as possible
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In the presence of discontiguous subnetworks, automatic summarization must be disabled
for routing to work properly. To turn off auto-summarization, use the following
command:
Router(config-router)#no auto-summary
Default Administrative Distance
QUESTION 13:
You need to alter the metrics of certain EIGRP routes in the Certkiller network.
Which two parameters are used by default to compute the EIGRP metric? (Select
two)
A. MTU
B. bandwidth
C. delay
D. reliability
E. load
F. Interface up time
Answer: B, C
Explanation:
Metrics are the mathematics used to select a route. The higher the metric associated with
a route, the less desirable it is. For EIGRP, the Bellman-Ford algorithm uses the
following equation and creates the overall 24-bit metric assigned to a route:
* metric = [(K1 ? bandwidth) + [(K2 ? bandwidth) ? (256 - load)] + (K3 ? delay)] ? [K5
? (reliability + K4)]
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The elements in this equation are as follows:
* By default, K1 = K3 = 1, K2 = K4 = K5 = 0. Therefore, by default, the metric formula
reduces to:
metric = (1 ? bandwidth) + (1 ? delay)
metric = bandwidth + delay
QUESTION 14:
The Certkiller network is using EIGRP as the network routing protocol. Which of
the following statements correctly describe features and characteristics of routing
using EIGRP? (Select three)
A. It sends periodic updates every 60 seconds.
B. EIGRP uses DUAL to achieve rapid convergence.
C. Adjacencies exist between master routers (MRs) in each domain.
D. It uses multicast to discover other EIGRP routers on an internetwork.
E. EIGRP provides support for multiple network layer protocols: IPX, AppleTalk, and IP.
Answer: B, D, E
Explanation:
B: Enhanced IGRP uses the Diffusing Update based algorithm (DUAL).
D: EIGRP use hello multicast packets for neighbor discovery/recovery.
E: EIGRP supports IPX, Appletalk, and IP. Separate EIGRP instances can be created for
each routed protocol.
Incorrect Answers:
A: EIGRP use triggered updates, not periodic updates.
C: Each EIGRP router maintains a neighbor table that lists adjacent routers. However,
there is no concept of master routers in EIGRP.
Reference: “Introduction to Enhanced IGRP (EIGRP)” Cisco website
QUESTION 15:
While comparing the tables associated with EIGRP and OSPF, you notice some
similarities. Which EIGRP table is similar to OSPF’s Link State Adjacency table?
A. Neighbor table
B. Routing table
C. Topology table
D. Successor table
E. None of the above
Answer: A
Explanation:
Each EIGRP router maintains a neighbor table that lists adjacent routers. This table is
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comparable to the neighbors (adjacency) database used by OSPF.
Incorrect Answers:
B: The routing table of EIGRP would compare to the routing table of OSPF
C: Both EIGRP and OSPF contain topology tables, which would compare to each other.
D: EIGRP does not have a successor table. Successors are maintained in the routing and
topology tables of EIGRP.
Reference: Building Scalable Cisco Networks (Cisco Press) page 250
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
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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
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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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