
- •Warning and Disclaimer
- •Feedback Information
- •Trademark Acknowledgments
- •About the Author
- •About the Technical Reviewers
- •Dedication
- •Acknowledgments
- •Contents at a Glance
- •Contents
- •Icons Used in This Book
- •Command Syntax Conventions
- •Cisco’s Motivation: Certifying Partners
- •Format of the CCNA Exams
- •What’s on the CCNA Exams
- •ICND Exam Topics
- •Cross-Reference Between Exam Topics and Book Parts
- •CCNA Exam Topics
- •INTRO and ICND Course Outlines
- •Objectives and Methods
- •Book Features
- •How This Book Is Organized
- •Part I: LAN Switching
- •Part II: TCP/IP
- •Part III: Wide-Area Networks
- •Part IV: Network Security
- •Part V: Final Preparation
- •Part VI: Appendixes
- •How to Use These Books to Prepare for the CCNA Exam
- •For More Information
- •Part I: LAN Switching
- •“Do I Know This Already?” Quiz
- •Foundation Topics
- •Brief Review of LAN Switching
- •The Forward-Versus-Filter Decision
- •How Switches Learn MAC Addresses
- •Forwarding Unknown Unicasts and Broadcasts
- •LAN Switch Logic Summary
- •Basic Switch Operation
- •Foundation Summary
- •Spanning Tree Protocol
- •“Do I Know This Already?” Quiz
- •Foundation Topics
- •Spanning Tree Protocol
- •What IEEE 802.1d Spanning Tree Does
- •How Spanning Tree Works
- •Electing the Root and Discovering Root Ports and Designated Ports
- •Reacting to Changes in the Network
- •Spanning Tree Protocol Summary
- •Optional STP Features
- •EtherChannel
- •PortFast
- •Rapid Spanning Tree (IEEE 802.1w)
- •RSTP Link and Edge Types
- •RSTP Port States
- •RSTP Port Roles
- •RSTP Convergence
- •Edge-Type Behavior and PortFast
- •Link-Type Shared
- •Link-Type Point-to-Point
- •An Example of Speedy RSTP Convergence
- •Basic STP show Commands
- •Changing STP Port Costs and Bridge Priority
- •Foundation Summary
- •Foundation Summary
- •Virtual LANs and Trunking
- •“Do I Know This Already?” Quiz
- •Foundation Topics
- •Review of Virtual LAN Concepts
- •Trunking with ISL and 802.1Q
- •ISL and 802.1Q Compared
- •VLAN Trunking Protocol (VTP)
- •How VTP Works
- •VTP Pruning
- •Foundation Summary
- •Part II: TCP/IP
- •IP Addressing and Subnetting
- •“Do I Know This Already?” Quiz
- •Foundation Topics
- •IP Addressing Review
- •IP Subnetting
- •Analyzing and Interpreting IP Addresses and Subnets
- •Math Operations Used to Answer Subnetting Questions
- •Converting IP Addresses from Decimal to Binary and Back Again
- •The Boolean AND Operation
- •How Many Hosts and How Many Subnets?
- •What Is the Subnet Number, and What Are the IP Addresses in the Subnet?
- •Finding the Subnet Number
- •Finding the Subnet Broadcast Address
- •Finding the Range of Valid IP Addresses in a Subnet
- •Finding the Answers Without Using Binary
- •Easier Math with Easy Masks
- •Which Subnet Masks Meet the Stated Design Requirements?
- •What Are the Other Subnet Numbers?
- •Foundation Summary
- •“Do I Know This Already?” Quiz
- •Foundation Topics
- •Extended ping Command
- •Distance Vector Concepts
- •Distance Vector Loop-Avoidance Features
- •Route Poisoning
- •Split Horizon
- •Split Horizon with Poison Reverse
- •Hold-Down Timer
- •Triggered (Flash) Updates
- •RIP and IGRP
- •IGRP Metrics
- •Examination of RIP and IGRP debug and show Commands
- •Issues When Multiple Routes to the Same Subnet Exist
- •Administrative Distance
- •Foundation Summary
- •“Do I Know This Already?” Quiz
- •Foundation Topics
- •Link-State Routing Protocol and OSPF Concepts
- •Steady-State Operation
- •Loop Avoidance
- •Scaling OSPF Through Hierarchical Design
- •OSPF Areas
- •Stub Areas
- •Summary: Comparing Link-State and OSPF to Distance Vector Protocols
- •Balanced Hybrid Routing Protocol and EIGRP Concepts
- •EIGRP Loop Avoidance
- •EIGRP Summary
- •Foundation Summary
- •“Do I Know This Already?” Quiz
- •Foundation Topics
- •Route Summarization and Variable-Length Subnet Masks
- •Route Summarization Concepts
- •VLSM
- •Route Summarization Strategies
- •Sample “Best” Summary on Seville
- •Sample “Best” Summary on Yosemite
- •Classless Routing Protocols and Classless Routing
- •Classless and Classful Routing Protocols
- •Autosummarization
- •Classful and Classless Routing
- •Default Routes
- •Classless Routing
- •Foundation Summary
- •Advanced TCP/IP Topics
- •“Do I Know This Already?” Quiz
- •Foundation Topics
- •Scaling the IP Address Space for the Internet
- •CIDR
- •Private Addressing
- •Network Address Translation
- •Static NAT
- •Dynamic NAT
- •Overloading NAT with Port Address Translation (PAT)
- •Translating Overlapping Addresses
- •Miscellaneous TCP/IP Topics
- •Internet Control Message Protocol (ICMP)
- •ICMP Echo Request and Echo Reply
- •Destination Unreachable ICMP Message
- •Time Exceeded ICMP Message
- •Redirect ICMP Message
- •Secondary IP Addressing
- •FTP and TFTP
- •TFTP
- •MTU and Fragmentation
- •Foundation Summary
- •Part III: Wide-Area Networks
- •“Do I Know This Already?” Quiz
- •Foundation Topics
- •Review of WAN Basics
- •Physical Components of Point-to-Point Leased Lines
- •Data-Link Protocols for Point-to-Point Leased Lines
- •HDLC and PPP Compared
- •Looped Link Detection
- •Enhanced Error Detection
- •Authentication Over WAN Links
- •PAP and CHAP Authentication
- •Foundation Summary
- •“Do I Know This Already?” Quiz
- •Foundation Topics
- •ISDN Protocols and Design
- •Typical Uses of ISDN
- •ISDN Channels
- •ISDN Protocols
- •ISDN BRI Function Groups and Reference Points
- •ISDN PRI Function Groups and Reference Points
- •BRI and PRI Encoding and Framing
- •PRI Encoding
- •PRI Framing
- •BRI Framing and Encoding
- •DDR Step 1: Routing Packets Out the Interface to Be Dialed
- •DDR Step 2: Determining the Subset of the Packets That Trigger the Dialing Process
- •DDR Step 3: Dialing (Signaling)
- •DDR Step 4: Determining When the Connection Is Terminated
- •ISDN and DDR show and debug Commands
- •Multilink PPP
- •Foundation Summary
- •Frame Relay
- •“Do I Know This Already?” Quiz
- •Foundation Topics
- •Frame Relay Protocols
- •Frame Relay Standards
- •Virtual Circuits
- •LMI and Encapsulation Types
- •DLCI Addressing Details
- •Network Layer Concerns with Frame Relay
- •Layer 3 Addressing with Frame Relay
- •Frame Relay Layer 3 Addressing: One Subnet Containing All Frame Relay DTEs
- •Frame Relay Layer 3 Addressing: One Subnet Per VC
- •Frame Relay Layer 3 Addressing: Hybrid Approach
- •Broadcast Handling
- •Frame Relay Service Interworking
- •A Fully-Meshed Network with One IP Subnet
- •Frame Relay Address Mapping
- •A Partially-Meshed Network with One IP Subnet Per VC
- •A Partially-Meshed Network with Some Fully-Meshed Parts
- •Foundation Summary
- •Part IV: Network Security
- •IP Access Control List Security
- •“Do I Know This Already?” Quiz
- •Foundation Topics
- •Standard IP Access Control Lists
- •IP Standard ACL Concepts
- •Wildcard Masks
- •Standard IP ACL: Example 2
- •Extended IP Access Control Lists
- •Extended IP ACL Concepts
- •Extended IP Access Lists: Example 1
- •Extended IP Access Lists: Example 2
- •Miscellaneous ACL Topics
- •Named IP Access Lists
- •Controlling Telnet Access with ACLs
- •ACL Implementation Considerations
- •Foundation Summary
- •Part V: Final Preparation
- •Final Preparation
- •Suggestions for Final Preparation
- •Preparing for the Exam Experience
- •Final Lab Scenarios
- •Scenario 1
- •Scenario 1, Part A: Planning
- •Solutions to Scenario 1, Part A: Planning
- •Scenario 2
- •Scenario 2, Part A: Planning
- •Solutions to Scenario 2, Part A: Planning
- •Part VI: Appendixes
- •Glossary
- •Answers to the “Do I Know This Already?” Quizzes and Q&A Questions
- •Chapter 1
- •“Do I Know This Already?” Quiz
- •Chapter 2
- •“Do I Know This Already?” Quiz
- •Chapter 3
- •“Do I Know This Already?” Quiz
- •Chapter 4
- •“Do I Know This Already?” Quiz
- •Chapter 5
- •“Do I Know This Already?” Quiz
- •Chapter 6
- •“Do I Know This Already?” Quiz
- •Chapter 7
- •“Do I Know This Already?” Quiz
- •Chapter 8
- •“Do I Know This Already?” Quiz
- •Chapter 9
- •“Do I Know This Already?” Quiz
- •Chapter 10
- •“Do I Know This Already?” Quiz
- •Chapter 11
- •“Do I Know This Already?” Quiz
- •Chapter 12
- •“Do I Know This Already?” Quiz
- •Using the Simulation Software for the Hands-on Exercises
- •Accessing NetSim from the CD
- •Hands-on Exercises Available with NetSim
- •Scenarios
- •Labs
- •Listing of the Hands-on Exercises
- •How You Should Proceed with NetSim
- •Considerations When Using NetSim
- •Routing Protocol Overview
- •Comparing and Contrasting IP Routing Protocols
- •Routing Through the Internet with the Border Gateway Protocol
- •RIP Version 2
- •The Integrated IS-IS Link State Routing Protocol
- •Summary of Interior Routing Protocols
- •Numbering Ports (Interfaces)

C H A P T E R13
Final Preparation
You have made it through most of the book, and you probably have scheduled your INTRO or CCNA exam or have at least thought about when you want to take it. Congratulations for getting this far! You will soon have finished the first step toward building your networking career resume.
This chapter provides some tips on your final preparation for the exam. It also provides a sample scenario that helps you pull together many hands-on skills in a single review section.
Suggestions for Final Preparation
Everyone has their own study habits, and you should know what works well for you. However, here are a few suggestions of some things you can try in the week or two before you take the exam:
■Reread the “Foundation Summary” sections of each chapter.
■When reviewing tables and definitions, cover up portions of summary tables with a piece of paper, forcing yourself to try to remember the details, instead of just glancing at them.
■Answer all the book’s questions again. Strive to master these questions so that you can answer them quickly.
■If you are still slow in answering subnetting questions, practice until you can find the subnet number and broadcast address within 1 minute when the mask is “hard.” You can use Appendix B for more practice.
■Before using the CD for general questions, use the mode that lets you perform a simulated exam. This helps you prepare for the exam experience.
■Repeat answering all the questions on the CD until you can answer most of them almost automatically.

460Chapter 13: Final Preparation
■Using a real set of routers and switches, or using a simulation product (such as NetSim, which is included on the accompanying CD), practice these basic skills:
—Accessing a switch and router
—Configuring basic administrative settings (passwords, host names, IP addresses)
—Practice configuring IP, static routes, and RIP
—Refer to Appendix C for a list of labs from this book that can be performed using the NetSim simulator that is included on the accompanying CD.
Preparing for the Exam Experience
If the CCNA exam will be your first experience with a proctored computer-based exam for Cisco certification, don’t be alarmed. It’s not terribly different from using the exam software on the CD that comes with this book. However, you should go into the exam day with the following in mind:
■You typically need two forms of ID, at least one of which is a picture ID. Driver’s license, passport, and military ID are all valid.
■The testing center is probably just an extra room inside the offices of a company that does something else as its primary business. Training companies often also are testing centers. The proctor often has other responsibilities besides monitoring the exams. The proctor seldom enters the testing room other than to bring in another person who has an exam scheduled. So don’t worry about someone staring at you and making you nervous! However, most testing centers have video cameras for monitoring. So just because you can’t see them doesn’t mean they aren’t watching!
■You need to turn off all electronic devices you bring with you—phone, pager, and secret decoder ring! I typically just leave them in the car. You might be asked to leave your pager or phone at the front desk.
■You cannot bring any of your own paper into the room. The proctor will give you something to write on—either paper or a dry-erase board and marker. In either case, you should return these to the proctor when you are done.
■You will take the exam using a PC. The proctor will start the software for you; all you have to do is follow the instructions. You do not have to start the exam the instant you sit down; you typically are allowed to take a fouror five-question practice test. The practice exam asks you questions in different formats about an unrelated topic to help you get used to the interface. Cisco often adds an optional survey before the exam as

Suggestions for Final Preparation 461
well, just to gather demographic information about who is taking the exam. If you’ve never taken a Cisco exam, take the extra few minutes to take the practice test, just to get completely comfortable with the environment.
■You can write on your scratch paper before the exam begins if you like. For instance, some people like to write down all the valid subnet masks, the corresponding prefixes, and possibly even the binary equivalents for the decimal numbers used in subnet masks. I’ve heard of some people writing down hard-to-memorize information that they were cramming for in the lobby of the testing center! Personally, I do not find it helpful to write down the hard-to-memorize things right before the exam begins, but for some people, it does help. Many people find it helpful to write down the subnetting information just mentioned.
■The exam engine does not let you go back and change an earlier answer. So read each question and answer thoroughly. As soon as you move on to the next question, you can’t go back!
■Some questions require that you drag and drop the answers into the correct slots in an answer area. Exam question writers like to use this type of question for lists or sequences in particular. As with all the questions, you can answer and then change your answer as long as you have not moved on to the next question. For drag-and-drop questions, you might benefit from moving the answers you are confident about into the (presumably) correct place and then fitting the others in. Often this helps you complete the answers correctly. Just don’t forget that as soon as you move on to the next question, you can’t go back!
■For simulated lab questions, you should go back and confirm that any new configurations are working. For instance, if the question asks you to configure RIP, but you do not see any routes when you use a show ip route command, you have not finished the question correctly. The simulator used on the exam works so that the show commands reflect what should happen. Many of the simulated lab questions require that you configure something, but it is also helpful if you know the pertinent show commands to verify the correct operation. Also, just for good measure, save your configuration unless the question tells you not to.
That’s a long list, but hopefully it will help you prepare for taking the exam. The most important tip is to simply relax. For most people, a good night’s rest is better than a night full of cramming.
The following list gives you a short reminder of the things you might want to keep in mind as you prepare to walk through the door of the testing center:
■Bring two pens.
■Bring two IDs, one with a picture.
■Turn off your electronic devices before going to the exam room.
■Relax!