Testinside cisco CCDA 640-861

Designing for Cisco Internetwork Solutions Exam : 640-861 Exam

640-861 DESGN
Designing for Cisco Internetwork Solutions Exam

Retired 7/13/2007
Exam Number: 640-861
Associated Certifications: CCDA
Duration: 75 minutes (55-65 questions)
Available Languages: English, Japanese in Japan only
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Exam Description Exam Topics Recommended Training Additional Resources
Exam Description
The Designing Cisco Internetworking exam is the only exam required to achieve a CCDA (Cisco Certified Design Associate) certification.

Exam Topics
The following information provides general guidelines for the content likely to be included on the Designing Cisco Internetworking exam. However, other related topics may also appear on any specific delivery of the exam.

Analysis
Gather and evaluate information regarding an organization’s existing social requirements
Gather and evaluate information regarding a network owner’s current data network and future needs
Gather and evaluate information regarding a network owner’s current voice network and future needs
Identify possible opportunities for network improvement
Validate gathered information
Document relevant findings

Modeling
Given a network design or set of requirements evaluate a solution that meets IP addressing needs
Given a network design or a set of requirements evaluate a solution that meets routing protocol needs
Given a network design or a set of requirements evaluate a solution that meets network management needs
Given a network design or a set of requirements evaluate a solution to incorporate equipment and technology within a Campus design
Given a network design or a set of requirements evaluate a solution to incorporate equipment and technology within an Enterprise Edge design
Design solutions to meet network owner needs applying the Enterprise Composite Network Model
Evaluate solutions addressing the issues of delivering voice traffic over a data network
Evaluate solutions for compliance with SAFE architecture

Planning
Develop an implementation plan
Develop a prototype testing plan
Develop a verification plan

“Designing for Cisco Internetwork Solutions Exam”, also known as 640-861 exam, is a Cisco certification.
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QUESTION 21:
Which of the following will you cite as reasons why VoIP calls could go off-net
earlier than designed when a converged network was configured to carry voice calls
on-net as close as possible to the destination to minimize long distance charges?
(Choose all that apply.)
A. destination routing not properly configured on both local gateways
B. local call manager server is too busy to process the call
C. local voice-gateway detects insufficient WAN bandwidth

D. the telephone user dials an access code
E. all of the above
Answer: C, D
Explanation:
If the near-end voice gateway, using quality of service (QoS) features detects that there is
not enough bandwidth to complete the call, then it reroutes the call off-net.
QUESTION 22:
A PBX is connected to a service provider that makes use of three ISDN PRI (T1)
links and no other facility. Non-Facility Associated Signaling (NFAS) is in use (only
one signaling channel for all three PRI links) and the tariff offering provides for the
maximum number of voice channels.
What is the maximum number of voice calls that can be made simultaneously?
A. 69
B. 71
C. 72
D. 90
E. 92
F. 120
Answer: B
Explanation:
ISDN Non-Facility Associated Signaling (NFAS) allows a single D channel to control multiple
Primary Rate Interfaces (PRIs). You can configure a backup D channel when the primary NFAS
D channel fails. When you configure the canalized T1 controllers for ISDN PRI, you only need to
configure the NFAS primary D channel; its configuration is distributed to all the members of the
associated NFAS group. By using a single D channel to control multiple PRIs, one extra channel
on each interface is free to carry data traffic. Any hard failure of the primary D-signaling channel
results in an immediate switchover to the backup D channel without disconnecting currently
connected users. Note: If you configure a backup D channel, only 23 B channels can be used on
the backup T1 controller because the D channel on the backup is unavailable. Therefore, only
those T1s that are neither primary nor backup can have 24 B channels available.
(23+1 23+1 23) = 71 last t1 D channel will used for backup
http://www.cisco.com/warp/public/793/access_dial/quadt1_nfas.pdf
QUESTION 23:
Study the exhibit below carefully:

Above is a converged voice and data network. This network is designed to carry
voice calls on-net as close a possible to the destination to reduce long distance
charges.
Why is it that a VoIP call can go off-net earlier than designed? (Choose two)
A. The local voice gateway detects lack of bandwidth.
B. The destination routing is not configured on both local and remote gateways.
C. The telephone user dials an access code.
D. The local call manager server is too busy to process the call.
Answer: A, C

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