Exam Description Exam Topics Recommended Training Additional Resources
Exam Description

The 642-415 UCAD Unified Communications Architecture and Design exam is the exam associated with the Cisco IP Telephony Design Specialist certification. This exam tests a candidate’s knowledge of technical issues surrounding the design of Voice over Data network and explains a methodology that brings order to approaching the problems faced by planners and designers, including assessment of the current network, Cisco methodology for implementing Voice over Data networks, and how to design sustainable and appropriate implementations. Candidates can prepare for this exam by taking the UCAD Cisco Unified Communications Architecture and Design course.
Exam Topics
1. Consider the following customer attributes and choose the correct IP telephony call processing model:
­ a large campus that spans two PSAP areas
­ a single group of buildings connected via fiber optics
­ data VPNs that support multiple contractors and suppliers
­ a fully developed three­tier network hierarchy
­ connectivity to two different service providers for Internet access
A. single­site call processing
B. centralized call processing
C. hybrid call processing
D. distributed call processing
Answer: A
2. What information is relevant to choosing an IP telephony centralized call processing model?
A. multiple PRIs to the PSTN
B. a campus of six buildings connected via an ATM backbone
C. three small regional sales offices located in the three Western time zones
D. centralized order processing, shipping, and billing for all customer products
E.  connectivity  to a  single  service provider  that hosts  the  company web  site and provides  for  Internet
access
F. a single six­story building with an IDF on each floor and an MDF in the computer room on the second
floor
Answer: C
3.  In  a  TDM  PBX  to Cisco Unified Communications Manager migration, which  three  things must  be
verified from the LAN perspective before IP telephony can be deployed? (Choose three.)
A. the type of wiring in the office
B. the number of PSTN connections needed
C. the number of public IP addresses available
D. the amount of rack space in the equipment rack
E. the amount of power that is available to support new LAN switches
Answer: ADE
4. Ajax wants to ensure  that their employees are safe and that they comply with the law. What are four
general E911 responsibilities of an enterprise telephony system? (Choose four.)
A. Enable PSAP call­back.
B. Initiate the update of ALI records.
C. Provide a detailed map of all ERLs.
D. Allow conferencing with internal security personnel.
E. Route calls to the appropriate point (on­net or off­net).
F. Deliver appropriate calling party number digits to LEC.
Answer: ABEF
The following topics are general guidelines for the content likely to be included on the Remote Access 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.
Determine the relevant critical business and technical needs in order to develop a Cisco Unified Communications design framework

* Determine which business considerations are relevant to a Call Control design
* Determine which technical considerations are relevant to a Call Control design

Determine the appropriate deployment model to meet Cisco Unified Communications design requirements

* Recognize the characteristics and limitations of a single-site Call Control deployment
* Recognize the characteristics and limitations of a multi-site centralized processing Call Control deployment
* Recognize the characteristics and limitations of a multi-site distributed / hybrid processing Call Control deployment
* Recognize the characteristics and limitations of distributed cluster Call Control deployment

Design a Cisco Unified Communications Manager cluster

* Determine Cisco Communications Manager redundancy model to meet design requirements
* Determine cluster services necessary to meet requirements for a given Cisco Unified Communications Manager cluster, including TFTP, MoH, CTI Manager, and Voice Media streaming application
* Determine hardware requirements for a given Cisco Unified Communications Manager cluster
* Determine when an LDAP integration is required

Design the dial plan to support Cisco Unified Communications requirements

* Explain the benefits of hierarchical and scalable numbering plans
* Explain the issues surrounding Directory Number (DN) design
* Explain the different path selection mechanisms available
* Explain the different digit manipulations available
* Explain the mechanisms used to enable calling privileges
* Explain the mechanisms used to provide call coverage
* Given a set of design requirements, design a dial plan
* Identify the requirements for provisioning emergency services in an IP telephony environment

Design a LAN topology to support voice and data on a converged Cisco Unified Communications network

* Design a highly available LAN infrastructure, capable of supporting voice and basic data requirements
* Identify PoE considerations that impact hardware selection
* Describe how DHCP, DNS, and NTP services impact LAN topology design
* Select appropriate hardware to meet LAN design requirements

Design a WAN topology to support voice on a converged Cisco Unified Communications network

* Determine voice bandwidth requirements for a given Busy Hour Call Attempts
* Identify hardware and software requirements for remote survivability in a centralized deployment
* Select appropriate hardware to meet WAN design requirements
* Describe the interrelationship between WAN topology and voice services

Design connectivity for off cluster destinations

* Determine how offnet connectivity issues influence gateway hardware and protocol selection
* Select appropriate hardware to meet offnet design requirements
* Determine circuit size based on a given set of calling patterns
* Determine type of circuit to meet business and technical requirements
* Given a set of business and technical requirements, design PSTN connectivity
* Given a set of business and technical requirements, design integration to Legacy Infrastructure components
* Given a set of business and technical requirements, determine the type of VoIP trunks needed

Design VoIP network to incorporate gatekeeper services

* Identify capabilities and services provided by a gatekeeper
* Given a set of business and technical requirements, design a VoIP network to incorporate a gatekeeper for CAC
* Given a set of business and technical requirements, design a VoIP network to incorporate a gatekeeper for dial plan resolution
* Identify the design requirements that impact the hardware selection for a gatekeeper

Design a QoS policy for a converged network

* Describe the purpose of a QoS policy
* Given business and technical requirements, develop a QoS policy
* Given business and technical requirements, select the appropriate CAC mechanisms
* Given business and technical requirements, define the parameters required to support a given CAC mechanism

Design media resources needed to support VoIP design requirements

* Given business and technical requirements, design conferencing support
* Given business and technical requirements, design transcoding support
* Given business and technical requirements, design MTP support
* Given business and technical requirements, determine the number of DSPs required
* Given business and technical requirements, determine MoH support
* Given business and technical requirements, determine media resource allocation

Determine environmental requirements of a Cisco Unified Communications design

* Determine physical space requirements for specified hardware
* Determine power requirements for specified design
* Determine HVAC requirements for specified design

Identify the security concerns relevant to a Cisco Unified Communications design

* Determine if an existing customer security plan will influence Cisco Unified Communications design
* Identify the potential threats to an IP telephony network
* Describe voice security features and their impact
* Given business policies and technical considerations, design a security policy for a Cisco Unified Communications solution

Product Description

Exam Number/Code: 642-415

Exam Name:Unified Communications Architecture and Design

“Unified Communications Architecture and Design”, also known as 642-415 exam, is a Cisco certification. With the complete collection of questions and answers, Pass4sure has assembled to take you through 58 Q&As to your 642-415 Exam preparation. In the 642-415 exam resources, you will cover every field and category in IP Communications helping to ready you for your successful Cisco Certification.
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Pass4sure offers free demo for 642-415 exam (Unified Communications Architecture and Design). You can check out the interface, question quality and usability of our practice exams before you decide to buy it.

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1.A network administrator is explaining VTP configuration to a new technician. What should the network administrator tell the new technician about VTP configuration? (Choose three.)
A. A switch in the VTP client mode cannot update its local VLAN database.
B. A trunk link must be configured between the switches to forward VTP updates.
C. A switch in the VTP server mode can update a switch in the VTP transparent mode.
D. A switch in the VTP transparent mode will forward updates that it receives to other switches.
E. A switch in the VTP server mode only updates switches in the VTP client mode that have a higher VTP revision number.
F. A switch in the VTP server mode will update switches in the VTP client mode regardless of the configured VTP domain membership.
Answer: ABD

2.Refer to the exhibit. Which two statements are true about interVLAN routing in the topology that is shown in the exhibit? (Choose two.)
A. Host E and host F use the same IP gateway address.
B. Router1 and Switch2 should be connected via a crossover cable.
C. Router1 will not play a role in communications between host A and host D.
D. The FastEthernet 0/0 interface on Router1 must be configured with subinterfaces.
E. Router1 needs more LAN interfaces to accommodate the VLANs that are shown in the exhibit.
F. The FastEthernet 0/0 interface on Router1 and Switch2 trunk ports must be configured using the same encapsulation type.
Answer: DF

3.Refer to the exhibit. Which two statements are true about the loopback address that is configured on RouterB? (Choose two.)
A. It ensures that data will be forwarded by RouterB.
B. It provides stability for the OSPF process on RouterB.
C. It specifies that the router ID for RouterB should be 10.0.0.1.
D. It decreases the metric for routes that are advertised from RouterB.
E. It indicates that RouterB should be elected the DR for the LAN.
Answer: BC

Questions)

Section 1: Describe Cable (HFC) technologies (8 Questions)

Q1
A few small  Exambible locations use HFC cable to connect to the Exambible WAN.
Which HFC cable network statement is true about the downstream data channel to the customer and the upstream data channel to the service provider?

A. The upstream data path is assigned a channel in a higher frequency range than the downstream path has.
B. The downstream data path is assigned a 30 MHz channel and the upstream data path is assigned a 1 MHz channel.
C. The downstream data path is assigned a fixed bandwidth channel and the upstream data path uses a variable bandwidth channel.
D. Both upstream and downstream data paths are assigned in 6 MHz channels.
E. None of the above.

Answer: D

Q2
Many small Exambible branch offices use broadband cable for data connection access. Which three modulation signaling standards are used in broadband cable technology? (Select three)

A. S-Video
B. NTSC
C. SECAM
D. PAL
E. FEC
F. FDM
G. MLP

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Answer: B, C, D

Q3
Some of the smaller Exambible locations use HFC cable to connect to the Exambible WAN. Which two statements are true about broadband cable (HFC) systems? (Select two)

A. Cable modems operate at Layers 1, 2, and 3 of the OSI model.
B. Cable modems operate at Layers 1 and 2 of the OSI model.
C. A function of the cable modem termination system is to convert the digital data stream from the end user host into a modulated RF signal for transmission onto the cable system.
D. Cable modems only operate at Layer 1 of the OSI model.
E. A function of the cable modem termination system (CMTS) is to convert the modulated signal from the cable modem into a digital signal.

Answer: B, E

Q4
A Exambible remote user is getting Internet access from the local cable provider.
When an individual is connected to the Internet by way of a CATV cable service, what kind of traffic is considered upstream traffic?

A. Traffic going from the user’s home traveling to the headend.
B. Broadcast traffic, including the cable TV signals.
C. Traffic between the headend and the TV signal.
D. Traffic between the headend and the supplier antenna.
E. Traffic from outside the local cable segment serving the user’s home.
F. All of the above can be considered upstream

Answer: A

Explanation:

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In the CATV space, the downstream channels in a cable plant (cable head-end to subscribers) is a point-to-multipoint channel. This does have very similar characteristics to transmitting over an Ethernet segment where one transmitter is being listened to by many receivers. The major difference is that base-band modulation has been replaced by a more densely modulated RF carrier with very sophisticated adaptive signal processing and forward error correction (FEC).
In the upstream direction (subscriber cable modems transmitting towards the head-end) the environment is many transmitters and one receiver. This introduces the need for precise scheduling of packet transmissions to achieve high utilization and precise power control so as to not overdrive the receiver or other amplifier electronics in the cable system. Since the upstream direction is like a single receiver with many antennas, the channels are much more susceptible to interfering noise products. In the cable industry, we generally call this ingress noise. As ingress noise is an inherent part of CATV plants, the observable impact is an unfortunate rise in the average noise floor in the upstream channel. To overcome this noise jungle, upstream modulation is not as dense as in the downstream and we have to use more effective FEC as used in the downstream.
Reference: http://www.cisco.com/warp/public/759/ipj_1-3/ipj_1-3_catv.html

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