Cisco Voice over IP - Exam 642-43 3rd Edition - Download

Cisco Voice over IP ~ Exam 642-43 3rd Edition - Download

Product Description
Authorized Self-Study Guide
Cisco Voice over IP (CVOICE)
Third Edition

Foundation learning for CVOICE exam 642-436

Kevin Wallace, CCIE No. 7945

Cisco Voice over IP (CVOICE), Third Edition, is a Cisco-authorized, self-paced learning tool for CCVP foundation learning. This book provides you with the knowledge and skills required to plan, design, and deploy a Cisco voice-over-IP (VoIP) network and to integrate gateways and gatekeepers into an enterprise VoIP network. By reading this book, you will gain a thorough understanding of converged voice and data networks and also the challenges you will face implementing various network technologies.
Cisco Voice over IP (CVOICE) presents you with information on the foundational elements of VoIP calls, the description of dial plans, and the implementation of gateways, gatekeepers, and Cisco Unified Border Elements (Cisco UBEs). The book gives you the information needed to implement and support data and voice integration solutions at the network-access level.
Whether you are preparing for CCVP certification or simply want to gain a better understanding of VoIP fundamentals, you will benefit from the foundation information presented in this book.
Cisco Voice over IP (CVOICE), Third Edition, is part of a recommended learning path from Cisco that includes simulation and hands-on training from authorized Cisco Learning Partners and self-study products from
Cisco Press. To find out more about instructor-led training, e-learning, and hands-on instruction offered by authorized Cisco Learning Partners worldwide, please visit http://www.cisco.com/go/authorizedtraining.
Kevin Wallace, CCIE No. 7945, is a certified Cisco instructor, and he teaches courses in the Cisco CCSP, CCVP, and CCNP® tracks. With 19 years of Cisco networking experience, Kevin has been a network design specialist for the Walt Disney World Resort and a network manager for Eastern Kentucky University.

* Integrate VoIP into an existing data network
* Design a VoIP network for optimal voice quality
* Examine the various call types in a VoIP network
* Configure analog voice interfaces and dial peers
* Perform call signaling over digital voice ports
* Implement H.323, MGCP, and SIP protocols on Cisco IOS® gateways
* Identify dial plan characteristics
* Configure advanced dial plans
* Deploy H.323 gatekeepers
* Implement a Cisco UBE router to provide protocol interworking

About the Author

Kevin Wallace, CCIE No. 7945, is a certified Cisco instructor, and he teaches courses in the Cisco CCSP, CCVP, and CCNP tracks. With 19 years of Cisco networking experience, Kevin has been a network design specialist for the Walt Disney World Resort and a network manager for Eastern Kentucky University. Kevin holds a bachelor of science degree in electrical engineering from the University of Kentucky. Kevin also is a CCVP, CCSP, CCNP, and CCDP with multiple Cisco security and IP communications specializations.
Product Details

* Hardcover: 600 pages
* Publisher: Cisco Press; 3 edition (July 26, 2008)
* Language: English
* ISBN-10: 1587055546
* ISBN-13: 978-1587055546

Cisco Certified Network Associate (CCNA 640-801) Video Suite - Download

Cisco CCNA Certification Suite(640-801) Video Suite - Download

Course Outline Click Here




Videos: 50
Demonstrations: 33
Animations: 16
Simulations: 161
Fact Sheets: 112
Exam Questions: 550
Exams: 61



Contents:

0.0 Introduction

0.1 Introduction

0.1.1 CCNA Certification
0.1.2 Using the Router Simulator
0.1.3 Available Commands

1.0 Networking Concepts (44 questions)

1.1 OSI Model Layers

1.1.1 OSI Model Introduction
1.1.2 Uses of the OSI Model
1.1.3 The Lower OSI Layers
1.1.4 The Upper OSI Layers
1.1.5 OSI Model Layers
1.1.6 Connection-oriented vs. Connectionless
1.1.7 ExamSim Questions - Section 1.1

1.2 TCP/IP

1.2.1 The TCP/IP Protocol Suite
1.2.2 TCP/IP Protocols
1.2.3 IP Addresses
1.2.4 IP Address Classes
1.2.5 Special Addresses
1.2.6 ExamSim Questions - Section 1.2

1.3 Device Communication

1.3.1 Data Encapsulation
1.3.2 Data Encapsulation Process
1.3.3 Service Data Units and Encapsulation
1.3.4 Internetwork Message Routing
1.3.5 Message Routing Facts
1.3.6 ExamSim Questions - Section 1.3

2.0 LAN Design (49 questions)

2.1 Ethernet

2.1.1 Ethernet Architecture
2.1.2 Collision Detection and Recovery
2.1.3 Ethernet Architecture Facts
2.1.4 Ethernet Standards
2.1.5 Half- and Full-Duplex
2.1.6 Upgrading to FastEthernet
2.1.7 ExamSim Questions - Section 2.1

2.2 Bridging and Switching

2.2.1 Bridges and Switches
2.2.2 How a Bridge Works
2.2.3 How a Bridge Learns
2.2.4 Bridge Facts
2.2.5 How a Switch Works
2.2.6 Switch Facts
2.2.7 ExamSim Questions - Section 2.2

2.3 Routing

2.3.1 Routers and Routing Tables
2.3.2 Routing Facts
2.3.3 ExamSim Questions - Section 2.3

2.4 LAN Segmentation

2.4.1 LAN Segmentation
2.4.2 Segmentation Facts
2.4.3 ExamSim Questions - Section 2.4

3.0 Cisco Devices (51 questions)

3.1 Connecting Devices

3.1.1 Connecting Devices
3.1.2 Making a Console Connection
3.1.3 Making a Virtual Terminal Connection
3.1.4 Connection Facts
3.1.5 ExamSim Questions - Section 3.1

3.2 Command Line Interface

3.2.1 Cisco IOS
3.2.2 Router Command Modes
3.2.3 Command Mode Prompts and Commands
3.2.4 Command Help
3.2.5 Command Help Facts
3.2.6 Use Command Help
3.2.7 Advanced Editing Features
3.2.8 Editing Features Facts
3.2.9 Command History
3.2.10 Command History Command List
3.2.11 Turn Off the Command History
3.2.12 Turn On the Command History
3.2.13 Change the Command History Size
3.2.14 View the Command History
3.2.15 ExamSim Questions - Section 3.2

3.3 System Startup

3.3.1 Startup Sequence
3.3.2 Startup Facts
3.3.3 Using Setup Mode
3.3.4 ExamSim Questions - Section 3.3

3.4 Managing System Files

3.4.1 Managing Startup Files and IOS Images
3.4.2 Router Memory
3.4.3 Manipulating Configuration Files
3.4.4 Copy Command List
3.4.5 Specifying Alternate Boot Locations
3.4.6 Backing Up and Upgrading IOS Images
3.4.7 IOS Boot and Upgrade Location Command List
3.4.8 ExamSim Questions - Section 3.4

3.5 Using Show Commands

3.5.1 Viewing Router Configuration
3.5.2 Show Command List (Basic)
3.5.3 View Router Information
3.5.4 ExamSim Questions - Section 3.5

4.0 Initial Router Configuration (31 questions)

4.1 Hostname and Interface Descriptions

4.1.1 Setting Router and Interface Identification
4.1.2 Router and Interface Identification Command List
4.1.3 Modify the Router Name
4.1.4 Set an Interface Description
4.1.5 Set Interface Descriptions
4.1.6 Configure Router and Interface Identification
4.1.7 ExamSim Questions - Section 4.1

4.2 System Passwords

4.2.1 Setting Router Passwords
4.2.2 Setting Line Passwords
4.2.3 Password Command List
4.2.4 Set Privileged Mode Passwords
4.2.5 Set Enable Passwords
4.2.6 Exploring Enable Passwords
4.2.7 Set the Console Password
4.2.8 Set a Virtual Terminal Password
4.2.9 Set Router Passwords
4.2.10 Set Console and Line Passwords
4.2.11 Prevent VTY Access
4.2.12 Control Router Access
4.2.13 ExamSim Questions - Section 4.2

4.3 Banners

4.3.1 Setting Router Banners
4.3.2 Banner Command List
4.3.3 Modify Router Banners 1
4.3.4 Modify Router Banners 2
4.3.5 Modify Router Banners 3
4.3.6 Modify Router Banners 4
4.3.7 ExamSim Questions - Section 4.3

4.4 Interfaces

4.4.1 Router Interfaces
4.4.2 Setting the IP Address
4.4.3 Interface Command List
4.4.4 Set an IP Address
4.4.5 Assign IP Addresses
4.4.6 Examining Interface Status
4.4.7 Examining Serial Interface Status
4.4.8 Interface Statuses
4.4.9 Using ping and traceroute
4.4.10 Exploring Ping
4.4.11 ExamSim Questions - Section 4.4

4.5 Back-to-Back Routers

4.5.1 Back-to-Back Router Configuration
4.5.2 Back-to-Back Configuration Facts
4.5.3 Exploring the Clock Rate
4.5.4 Configure Back-to-Back Routers 1
4.5.5 Configure Back-to-Back Routers 2
4.5.6 Troubleshoot Serial Connections 1
4.5.7 Troubleshoot Serial Connections 2
4.5.8 Troubleshoot Serial Connections 3
4.5.9 ExamSim Questions - Section 4.5

4.6 Cisco Discovery Protocol (CDP)

4.6.1 Cisco Discovery Protocol (CDP)
4.6.2 Configuring CDP
4.6.3 CDP Command List
4.6.4 View CDP Information
4.6.5 Exploring CDP
4.6.6 Disable CDP on an Interface
4.6.7 Disable CDP on the Router
4.6.8 Configure CDP
4.6.9 Configure CDP Advertisements
4.6.10 Reset CDP Timers
4.6.11 ExamSim Questions - Section 4.6

5.0 Switch Configuration (33 questions)

5.1 Switch Basics

5.1.1 Managing Switches
5.1.2 Switch Components
5.1.3 Switch Configuration Modes
5.1.4 Switch Configuration Command List
5.1.5 Configure the Enable Password
5.1.6 Configure the Hostname and Password
5.1.7 Configure Port Descriptions
5.1.8 Configure a Switch
5.1.9 Configure CDP Parameters
5.1.10 Disable CDP for a Port
5.1.11 Setting the Switch IP Address
5.1.12 Switch IP Address Facts
5.1.13 Configure the Switch IP Address
5.1.14 Exploring Ping from a Switch
5.1.15 Exploring the Default Gateway
5.1.16 Exploring Switch Port Status
5.1.17 ExamSim Questions - Section 5.1

5.2 Virtual LANs (VLANs)

5.2.1 Virtual LANs (VLANs)
5.2.2 VLAN Frame Tagging
5.2.3 Frame Tagging Facts
5.2.4 VLAN Facts
5.2.5 Configuring VLANs
5.2.6 VLAN Command List
5.2.7 Create a VLAN
5.2.8 Create a VLAN with a Name
5.2.9 Modify VLAN Membership
5.2.10 Exploring VLAN Communication
5.2.11 ExamSim Questions - Section 5.2

5.3 Trunking

5.3.1 Trunking
5.3.2 Trunking Command List
5.3.3 Configuring Trunking
5.3.4 Configure Trunking
5.3.5 VLAN Trunking Protocol (VTP)
5.3.6 VTP Facts
5.3.7 Exploring VTP Modes
5.3.8 Configure the Access Mode
5.3.9 ExamSim Questions - Section 5.3

5.4 Spanning Tree

5.4.1 Spanning Tree
5.4.2 Spanning Tree Facts
5.4.3 Spanning Tree Command List
5.4.4 Enable and Disable STP
5.4.5 EtherChannel
5.4.6 EtherChannel Facts
5.4.7 ExamSim Questions - Section 5.4

5.5 Advanced Switching

5.5.1 Switch Port Security
5.5.2 Port Security Facts
5.5.3 Default Switch Configuration
5.5.4 Inter-VLAN Routing
5.5.5 Layer 3 Switching

6.0 Managing TCP/IP (54 questions)

6.1 Subnetting

6.1.1 Classless Interdomain Routing (CIDR)
6.1.2 Subnetting Tasks
6.1.3 Subnetting Scenarios
6.1.4 Binary Calculations
6.1.5 Identifying Subnets and Hosts
6.1.6 Identify the Number of Subnets and Hosts
6.1.7 Selecting a Subnet Mask
6.1.8 Select a Subnet Mask
6.1.9 Identifying Valid Subnets
6.1.10 Identify Valid Subnets
6.1.11 Identifying the Host Range
6.1.12 Identify Addresses
6.1.13 Subnetting Operations

6.2 Configuring IP

6.2.1 IP Configuration
6.2.2 Configure an IP Address 1
6.2.3 Configure an IP Address 2
6.2.4 Configure IP Addresses
6.2.5 ExamSim Questions - Section 6.2

6.3 Address Resolution

6.3.1 Address Resolution
6.3.2 The DHCP Process
6.3.3 Address Resolution Protocols
6.3.4 Network Address Translation (NAT)
6.3.5 NAT Facts
6.3.6 NAT Command List
6.3.7 ExamSim Questions - Section 6.3

6.4 Troubleshooting IP

6.4.1 Troubleshooting IP
6.4.2 Traceroute and TTL
6.4.3 IP Troubleshooting
6.4.4 ICMP Messages
6.4.5 ExamSim Questions - Section 6.4

7.0 Access Lists (25 questions)

7.1 Access List Concepts

7.1.1 Access Lists
7.1.2 Access List Facts
7.1.3 ExamSim Questions - Section 7.1

7.2 Configuring Access Lists

7.2.1 Configuring Standard IP Access Lists
7.2.2 Configuring Extended IP Access Lists
7.2.3 IP Access List Command List
7.2.4 Deny Traffic from Specific Hosts
7.2.5 Deny Traffic from Specific Networks
7.2.6 Permit Traffic
7.2.7 Permit Traffic from Specific Hosts
7.2.8 Permit Traffic from Specific Networks
7.2.9 Apply a List to an Interface
7.2.10 Remove a List from an Interface
7.2.11 Apply Access Lists to Interfaces
7.2.12 ExamSim Questions - Section 7.2

7.3 Working with Wildcard Masks

7.3.1 Wildcard Masks
7.3.2 Calculating Wildcard Masks
7.3.3 Use Wildcard Masks 1
7.3.4 Use Wildcard Masks 2
7.3.5 Use Wildcard Masks 3
7.3.6 Use Wildcard Masks 4

7.4 Designing and Monitoring Access Lists

7.4.1 Designing Access Lists
7.4.2 Access List Design Practice 1
7.4.3 Access List Design Practice 2
7.4.4 Access List Design Practice 3
7.4.5 Access List Design Practice 4
7.4.6 Monitoring Access Lists
7.4.7 ExamSim Questions - Section 7.4

8.0 IP Routing (71 questions)

8.1 Routing Concepts

8.1.1 Routing
8.1.2 Routing Protocols
8.1.3 Distance Vector Routing
8.1.4 Routing Loops
8.1.5 Distance Vector Routing Facts
8.1.6 Link State Routing
8.1.7 Link State Route Discovery
8.1.8 Link State Routing Facts
8.1.9 ExamSim Questions - Section 8.1

8.2 Static Routes

8.2.1 Default and Static Routes
8.2.2 Adding Manual Routes
8.2.3 Static Route Command List
8.2.4 Configure Static Routes 1
8.2.5 Configure Static Routes 2
8.2.6 Configure Static Routes 3
8.2.7 ExamSim Questions - Section 8.2

8.3 Configuring RIP

8.3.1 RIP Facts
8.3.2 Configuring RIP
8.3.3 RIP Command List
8.3.4 View the Routing Table
8.3.5 Examining the Routing Table
8.3.6 Configure RIP Networks 1
8.3.7 Configure RIP Networks 2
8.3.8 Disable IP Routing
8.3.9 Configure RIP Routing 1
8.3.10 Configure RIP Routing 2
8.3.11 Configure RIP Routing (3 routers)
8.3.12 Exploring Network Addressing
8.3.13 ExamSim Questions - Section 8.3

8.4 Troubleshooting RIP

8.4.1 RIP Troubleshooting Introduction
8.4.2 Troubleshoot RIP 1
8.4.3 Troubleshoot RIP 2
8.4.4 Troubleshoot RIP 3
8.4.5 Troubleshoot RIP 4
8.4.6 Troubleshoot RIP 5
8.4.7 Troubleshoot RIP 6
8.4.8 Debugging RIP
8.4.9 RIP Debugging
8.4.10 ExamSim Questions - Section 8.4

8.5 Additional Configuration Practice

8.5.1 RIP Practice Network Diagram
8.5.2 Configure the LAX Router
8.5.3 Configure the SFO Router
8.5.4 Configure the SEA Router
8.5.5 Configure the BOI Router
8.5.6 Configure the DEN Router

8.6 Configuring IGRP

8.6.1 IGRP Facts
8.6.2 Configuring IGRP
8.6.3 IGRP Command List
8.6.4 Configure IGRP Networks
8.6.5 Configure IGRP Routing 1
8.6.6 Configure IGRP Communication
8.6.7 Configure IGRP Routing 2
8.6.8 Exploring the AS Number
8.6.9 Exploring RIP and IGRP Interaction
8.6.10 ExamSim Questions - Section 8.6

8.7 Troubleshooting IGRP

8.7.1 IGRP Troubleshooting Introduction
8.7.2 Troubleshoot IGRP 1
8.7.3 Troubleshoot IGRP 2
8.7.4 Troubleshoot IGRP 3
8.7.5 ExamSim Questions - Section 8.7

8.8 OSPF

8.8.1 OSPF Design
8.8.2 OSPF Facts
8.8.3 Configuring OSPF
8.8.4 OSPF Command List
8.8.5 Configure OSPF Networks
8.8.6 Exploring OSPF
8.8.7 Configure OSPF Routing
8.8.8 Managing OSPF
8.8.9 Troubleshoot OSPF 1
8.8.10 Troubleshoot OSPF 2
8.8.11 Troubleshoot OSPF 3
8.8.12 ExamSim Questions - Section 8.8

8.9 EIGRP

8.9.1 EIGRP Facts
8.9.2 EIGRP Command List
8.9.3 Configure EIGRP Networks
8.9.4 Configure EIGRP Routing
8.9.5 Troubleshoot EIGRP 1
8.9.6 Troubleshoot EIGRP 2
8.9.7 Troubleshoot EIGRP 3
8.9.8 ExamSim Questions - Section 8.9

8.10 Routing Protocol Comparison

8.10.1 Routing Protocol Comparison
8.10.2 Routing Administrative Distances
8.10.3 ExamSim Questions - Section 8.10

9.0 Wide Area Networking (12 questions)

9.1 WAN Concepts

9.1.1 WAN Communication
9.1.2 WAN Structure
9.1.3 WAN Services
9.1.4 WAN Services Facts
9.1.5 WAN Encapsulation
9.1.6 WAN Encapsulation Facts
9.1.7 ExamSim Questions - Section 9.1

10.0 Point-to-Point Protocol (PPP) (15 questions)

10.1 PPP

10.1.1 PPP Concepts
10.1.2 Establishing a PPP Session
10.1.3 PPP Facts
10.1.4 Setting PPP Encapsulation
10.1.5 PPP Command List
10.1.6 Exploring Serial Encapsulation
10.1.7 Configure PPP
10.1.8 ExamSim Questions - Section 10.1

11.0 Frame Relay (25 questions)

11.1 Frame Relay Concepts

11.1.1 Frame Relay
11.1.2 Frame Relay Communication
11.1.3 Frame Relay Facts
11.1.4 Frame Relay Protocols
11.1.5 ExamSim Questions - Section 11.1

11.2 Enabling Frame Relay

11.2.1 Configuring Frame Relay
11.2.2 Frame Relay Command List
11.2.3 Exploring Inverse ARP
11.2.4 Configure Frame Relay Encapsulation
11.2.5 Configure Frame Relay Communication
11.2.6 Disable Inverse ARP
11.2.7 ExamSim Questions - Section 11.2

11.3 Static Mappings

11.3.1 Exploring Static Mappings
11.3.2 Add a Static Map
11.3.3 Configure Static Mappings
11.3.4 Configure Frame Relay Links

11.4 Subinterfaces

11.4.1 Subinterfaces
11.4.2 Subinterfaces Facts
11.4.3 Configuring Serial Subinterfaces: Multipoint
11.4.4 Configuring Serial Subinterfaces: Point-to-Point
11.4.5 Frame Relay Subinterface Command List
11.4.6 Configure Point-to-Point Frame Relay
11.4.7 Configure Multipoint Frame Relay
11.4.8 Configure a Subinterface 1
11.4.9 Configure a Subinterface 2
11.4.10 ExamSim Questions - Section 11.4

11.5 Troubleshooting Frame Relay

11.5.1 Frame Relay Troubleshooting Introduction
11.5.2 Troubleshoot Frame Relay 1
11.5.3 Troubleshoot Frame Relay 2
11.5.4 Troubleshoot Frame Relay 3
11.5.5 Troubleshoot Frame Relay 4
11.5.6 Troubleshoot Frame Relay 5
11.5.7 Monitoring Frame Relay
11.5.8 ExamSim Questions - Section 11.5

12.0 ISDN (38 questions)

12.1 ISDN Concepts

12.1.1 ISDN
12.1.2 ISDN Facts
12.1.3 ISDN Protocol Standards
12.1.4 ISDN Components and Reference Points
12.1.5 ISDN Addressing
12.1.6 ISDN Communication
12.1.7 ISDN Communication Facts
12.1.8 ExamSim Questions - Section 12.1

12.2 Configuring BRI Interfaces

12.2.1 Configuring ISDN BRI
12.2.2 ISDN Command List
12.2.3 About ISDN Simulations
12.2.4 Configure the Switch Type
12.2.5 Configure SPIDs
12.2.6 Exploring BRI Status
12.2.7 Exploring ISDN Status
12.2.8 Configure BRI Connections
12.2.9 Configure BRI Communications
12.2.10 ExamSim Questions - Section 12.2

12.3 Dial-on-Demand Routing (DDR)

12.3.1 Dial-on-Demand Routing
12.3.2 The DDR Process
12.3.3 DDR Facts
12.3.4 Configuring Dial-on-Demand Routing (DDR)
12.3.5 DDR Command List
12.3.6 Configure a Dialer Group
12.3.7 Exploring Dialer Strings and Maps
12.3.8 Configure Dialer Strings
12.3.9 Configure Dialer Maps
12.3.10 Configure a DDR Connection
12.3.11 Configure DDR Communications 1
12.3.12 Configure Static DDR Routes
12.3.13 Configure DDR Communications 2
12.3.14 ExamSim Questions - Section 12.3

12.4 DDR Timers

12.4.1 DDR Timers
12.4.2 Set the Idle Timer
12.4.3 Set the Fast Idle Timer
12.4.4 Configure DDR Timers
12.4.5 Reset the DDR Timers
12.4.6 ExamSim Questions - Section 12.4

12.5 Complete ISDN Configuration

12.5.1 ISDN Configuration Process
12.5.2 Configure ISDN/DDR Communications
12.5.3 Configure ISDN/DDR Routing

12.6 Troubleshooting ISDN BRI

12.6.1 DDR Show Commands
12.6.2 ISDN Troubleshooting Introduction
12.6.3 Troubleshoot BRI Connections 1
12.6.4 Troubleshoot BRI Connections 2
12.6.5 Troubleshoot BRI Connections 3
12.6.6 Troubleshoot BRI Connections 4
12.6.7 Troubleshoot BRI Connections 5
12.6.8 ExamSim Questions - Section 12.6

ExamSim (550 questions)

Preparing for Certification

Exam Objectives
Exam FAQs
How to Register for an Exam
Exam-taking Hints and Tips

Objective 100, All Questions (68 questions)
Objective 200, All Questions (176 questions)
Objective 300, All Questions (90 questions)
Objective 400, All Questions (216 questions)
Typical Exam

Brief Description

Code:

Through the powerful multimedia and simulation tools, TestOut provides a unique and powerful training program to fully and adequately prepare students to become CCNA certified. Gain hands-on experience with protocols such as IP RIP, RIP, Ethernet, Access Lists, and so much more before taking certification exams. TestOut’s break-through technology and training courses are guaranteed to help students achieve passing exam scores to become CCNA certified.

Product Features:

CourseSim

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CourseSim is a comprehensive learning tool that is aligned with vendor-developed certification objectives. The CourseSim materials integrate multimedia technologies, applied simulation technologies, instructional animations, and technical graphic images into a sophisticated learning environment.

LabSim

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LabSim is the world's highest fidelity simulation product that aligns with the leading IT certifications. LabSim allows you to simulate hardware, operating systems and network configurations on your computer without the need of additional hardware or software. It is like having an interactive learning lab, without the expensive setup costs.

ExamSim

ExamSim software is designed to give students practical experience for taking certification exams. The tests look and feel just like the actual exams. This tool is critical to assess practical knowledge of training objectives and concepts. Each exam title comes with hundreds of randomized practice questions that cover all official exam objectives.