CCDA : 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

Exam Number/Code: 640-861
Exam Name:CCDA

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Exam DetailsThe Designing Cisco Internetworking exam is the only exam required to achieve a CCDA (Cisco Certified Design Associate) certification.

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QUESTION 11:
You are contracted as the network administrator, for a gaming software company,
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Certkiller . The CEO wants an improved communication infrastructure and thus
wants you to redesign the existing network.
The following is the Certkiller CEO’s opinion:
* The goal is to become one of the top three peer-to-peer online gaming software
companies.
* There are currently 200 employees around the globe, of which 150 is located in
London, the head quarters.
* Anticipated staff growth is set at around 500 employees in two year’s time. Of the 500
employees, 40% will work remotely as a cost reduction method.
* With such a growth rate, the release of 20 titles in the next 12 months is anticipated.
Which additional pieces of information are necessary to design the campus core? (Choose
all that apply?)
A. The current operating system.
B. The authenticity and security policy
C. The traffic pattern
D. The current implementation
E. The company’s position in the gaming market industry
Answer: C, D
Explanation
Certkiller wants to redesign the network based on growth, therefore the below are needed
in the assessment:
Network Topology
Address Schemes
Concerns about the network
Incorrect Answers:
A: The OS is not relevant in the network redesign
B: Security and authenticity are not objectives and should already be in place given the
scenario.
E: Company position is irrelevant
Reference: Designing Cisco Networks, Page 55
QUESTION 12:
Which three sources does the network engineer use to collect information for
characterizing an existing network? (Choose tree)
A. Staff input
B. Visual inventory
C. Network Audit
D. Traffic analysis
E. Server Statistic
Answer: A, C, D
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Explanation:
According to the Cisco Press CCDA Study Guide the steps for characterizing an existing
network are:
Step 1 – Customer Input
Step 2 – Network Audit
Step 3 – Traffic Analysis
QUESTION 13:
Which two information sources will provide the most accurate data if you were
tasked to find information regarding a customer’s existing network? (Select two)
A. Existing network topology diagram
B. Customer interview
C. Traffic analyst
D. Configuration obtain from network equipment
E. Customer supply server list
Answer: A, D
Explanation:
Although gathering information from the customer is the 1st step it is usually not the
most accurate. The most accurate sources of data can be found directly from the
configuration files of the equipment and from documentation sources such as the existing
network topology exams.
QUESTION 14:
The Certkiller network is upgrading their core LAN to a switched network. Which
group of requirements is the primary reason to upgrade a client’s network to a
switched network?
A. Business requirements
B. Performance requirements
C. Manageability requirements
D. Application requirements
E. None of the above
Answer: B
Explanation:
With the recent developments in Gigabit Ethernet and LAN switching technologies, LAN
designs are now capable of 1000 Mbps speeds. High-speed Gigabit links can connect
servers to LAN switches. At these speeds, the capacity is there to meet the performance
requirements of current high-bandwidth applications. Although upgrading a LAN to a
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switched environment may mean additional up front costs, the performance of the
network will increase greatly.
QUESTION 15:
A stock brokerage firm is opening a new office in Melbourne. A dozen stock traders
will require constant data access to exchanges all around the world. This access
must be fast and without interruption.
Which two features can help provide this level of service? (Select two)
A. CDP
B. IGRP
C. CoS
D. QoS
E. GoS
Answer: C, D
Explanation:
Quality of Service/Class of Service:
More and more services running over converged, wireless or wireline networks require
Quality of Service (QoS) commitments in order to guarantee delivery of mission critical
traffic and applications across a network. Enterprise customers also increasingly require
Class of Service (CoS) control that allows them to implement priority queuing to classify
and prioritize packets based on factors such as type of application or by user.
QUESTION 16:
What are three valid methods of gathering information about an existing data
network? (Choose three)
A. Perform an audit at packet level detail (PLD) and for carrier service guarantees.
B. Use organizational input.
C. Perform a network audit to gather more detailed information of the network.
D. Analyze the user-mapping of a running application.
E. Perform a traffic analysis.
F. Use reports that have the ability to measure metrics.
Answer: C, D, E
Explanation:
The network information gathering aspects of the design phase comprise the following
steps:
1. Performing a network audit
2. Performing traffic analysis
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3. Analyzing user applications
All of the above steps should be taken when gathering data about an existing network.
QUESTION 17:
Two different Certkiller networks are displayed below:
The two networks shown in the diagram have very different traffic patterns, as
illustrated by the black arrows. Network A has two departments organized in
separate VLANs. Each department VLAN contains the servers and printers that are
used by the department personnel. The only common resource used by both
departments is the email server, located on a remote network. Network B also has
two departments organized in separate VLANs. All of the applications used by both
departments are located on common database servers. The common database
servers are located in a server farm on a separate network from the users. Which
three statements are true about the networks in this diagram? (Choose three)
A. Network A is designed to accommodate file transfers from other department servers
on a frequent basis.
B. The design in Network B will require a higher performance Layer 3 switch.
C. Network B illustrates the 20/80 rule.
D. Network B is designed so that distribution layer switches concentrate users in their
own VLANs.
E. Network A is designed to keep 80% of the traffic within the local workgroup.
F. Network A is designed to have 80% of the traffic pass through the Layer 3 switches.
Answer: B, C, E
Explanation:
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The 80/20 rule states that 80 percent of the traffic is “local” to the workgroup while 20
percent is remote or outside of the workgroup. In theory, by properly configuring VLANs
or by using layer 3 devices to match workgroups, only the 20 percent of the traffic that is
not local will need to pass through a router and out of the workgroup, improving
performance for the 80 percent of the traffic that is within the workgroup. As shown by
the traffic patterns pertaining to these two networks, only network A correctly represents
this 80/20 rule, while network B shows the 20/80 rule.
In network B, a layer 3 switch should be added to increase network performance, while
also decreasing the amount of broadcast traffic.
QUESTION 18:
Which of the following features will you affect when you choose a codec in your
network design to carry IP telephony? (Choose all that apply.)
A. Voice packet header size
B. Bandwidth necessary for voice calls
C. Voice quality
D. Silence packet handling
E. All of the above.
Answer: B, C
Explanation:
The Codec that is chosen for VOIP will directly impact the bandwidth needed for each
call, as well as the quality of that VOIP call. Generally, the codec that uses the least
amount of bandwidth also has the worst voice quality. Below are the three most
commonly used VOIP codecs:
Standard Packet Size Sample
Duration
Data Rate
Bits
PPS
Simplex
G.711 120 15ms 64K 66
G.729A 10 10ms 8K 100
G.723.1 24 30ms 5.3/6.4K 33
Incorrect Answers:
A: This will not play any role for deciding codec
D: This is not main characteristic of codec
E: This is not a valid option.
QUESTION 19:
You are the network administrator at Certkiller . You are planning trunk capacity
for the Certkiller network. You need to determine the number of circuits needed
from a PBX to a converged network.
Which information would you require to make this decision? (Choose all that
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apply.)
A. Busy hour traffic.
B. The number of sites.
C. Blocking probability (GoS).
D. The number of users per site.
E. The average duration of a call.
Answer: A, C
Explanation:
A: Measure network traffic load during the busiest hour because this period represents
the maximum traffic load that your network must support. The result gives you a traffic
load measurement commonly referred to as the Busy Hour Traffic (BHT).
C: Grade of Service (GoS) is defined as the probability that calls will be blocked while
attempting to seize circuits. It is written as P.xx blocking factor or blockage, where xx is
the percentage of calls that are blocked for a traffic system.
Incorrect Answers
B: Number of sites will give an idea for sizing the PBX
D: This will not play major role.
E: Most traffic models do not consider call duration. Call holding times are assumed to
be exponential.
QUESTION 20:
To minimize expenses due to long distance charges, you designed a converged
network to carry calls on-net as close as possible to the destination.
Why can a VoIP call go off-net earlier that designed? (Choose two.)
A. The local voice gateway sends busy-back signal.
B. The Call Manager server is too busy to process the call in a usual manner.
C. The telephone user dials an access code.
D. Destination routing not properly setup on the local and remote gateways.
Answer: A, C

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