CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide (2024)
CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide (2024) is your shortcut to certification success—start preparing today!
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ENWLSD 300-425 and
Implementation ENWLSI 300-430
Official Cert Guide 2nd Edition
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ENWLSD 300-425 and
Implementation ENWLSI 300-430
Official Cert Guide
2nd Edition
Jerome Henry, CCIE® No. 24750
David Hucaby, CCIE® No. 4594, CWNE No. 292
Cisco Press
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425 and Implementation ENWLSI 300-430 Official
Cert Guide 2nd Edition
Jerome Henry
David Hucaby
Copyright© 2024 Cisco Systems, Inc.
Published by:
Cisco Press
$PrintCode
Library of Congress Control Number: 2023920459
ISBN-13: 978-0-13-824989-2
ISBN-10: 0-13-824989-X
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Jerome Henry, CCIE No. 24750, is a Distinguished Engineer in the Office
of the Wireless CTO at Cisco Systems. Jerome has more than 20 years’
experience teaching technical Cisco courses, in more than 15 countries and
four languages, to audiences ranging from bachelor’s degree students to
networking professionals and Cisco internal system engineers. Focusing on
his wireless and networking experience, Jerome joined Cisco in 2012. Before
that time, he was consulting and teaching about heterogeneous networks and
wireless integration with the European Airespace team, which was later
acquired by Cisco to become its main wireless solution. He then spent several
years with a Cisco Learning Partner, developing networking courses and
working on training materials for emerging technologies.
Jerome is a certified wireless networking expert (CWNE No. 45), has
developed multiple Cisco courses, and has authored several books and video
courses on wireless technology. Jerome holds more than 500 patents, is a
member of the IEEE, where he was elevated to Senior Member in 2013, and
also represents Cisco in multiple Wi-Fi Alliance working groups. With more
than 10,000 hours in the classroom, Jerome was awarded the IT Training
Award Best Instructor silver medal. He is based in Research Triangle Park,
North Carolina.
David Hucaby, CCIE No. 4594, CWNE No. 292, is a technical education
content engineer for Cisco Meraki. Previously, he worked as a wireless
escalation engineer in a large healthcare environment for over 20 years.
David holds bachelor’s and master’s degrees in electrical engineering. He has
been authoring Cisco Press titles for 25 years. David lives in Kentucky.
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Samuel Clements, CCIE Wireless No. 40629, is a Mobility Technical
Solutions Architect for World Wide Technology (wwt.com), a Global VAR.
He is CWNE No. 101 and is active in all things Wi-Fi. You can find him
blogging at http://www.sc-wifi.com/ and on X (formerly Twitter) at
@samuel_clements. When he’s not doing Wi-Fi things, he’s spending time in
Tennessee with his wife of 15 years, Sara, and his two children, Tristan and
Ginny.
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In many ways, this century (and probably the previous ones) resembles Wi-
Fi. Every few years, new developments fundamentally change the way we
work and communicate. Each time we look back a few years, we realize that
today we have more information to absorb and more new technologies to
understand. What was concluded as impossible is now experimented with or
achieved sooner and faster than we thought. As you open this book, dear
reader, to prepare for the CCNP exam, this step may look steep today, but it
will soon be just a memory of a time you knew less and could do less. Your
will to excel and deepen your knowledge is what you, dear reader, give to us,
the authors, as a reason to continue sharpening our expertise and sharing what
we have learned on the way. So this book is for you, dear reader, and your
aspiration to excellence. As my family blazon says, sic itur ad astro: “this is
how you reach for the stars.”
—Jerome Henry
As always, my work is dedicated to my wife, my daughters, and my twin
grandsons, for their love and support, and to God, who has blessed me with
opportunities to learn, write, and work with so many friends—abundant life
indeed!
—David Hucaby
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My dear wife, Corinne, often says that she knows “that look,” she knows
“that pace,” when I walk back and forth in the corridor of our home leading
to my office. She knows when I am not satisfied with a sentence, critical of
an explanation that I do not find clear enough, or unhappy with an example or
an analogy that does not quite work like it should. Each time, she patiently
throws me a question to help me verbalize the problem and, in the end, puts
her finger on what was missing. This book would not have been possible
without her patience. “Patience made human” is also how I see Brett Bartow
and Nancy Davis, who helped us navigate the complexity of changing exam
scopes, and Ellie Bru, who week after week herded us, her authors, corrected
our mistakes, and patted our backs to help us stay at the level of quality she
expected. If this book is not a collection of disorganized notes on pieces of
napkins, it is thanks to them. And, of course, flying with multiple pilots only
works if each of them mixes excellence in their domain, acceptance that
another one may be covering the left or the right field, and a permanent re-
assessment of who is where, who has covered what, and who has left what
gap or ground to complete. I could not dream of a better co-pilot than Dave,
who was kind enough to accept me and enjoy this flight together.
—Jerome Henry
It’s again a great pleasure to have worked on a project with Jerome Henry,
whom I have long admired for his Wi-Fi knowledge and experience. He’s not
only that—he’s been a superb co-author and a kind and gracious friend. Ellie
Bru has been an awesome development editor and has kept us motivated all
along the way with encouragement and funny GIFs. I’m grateful to Brett
Bartow and Nancy Davis for giving me another opportunity to write. Many
thanks to Samuel Clements for his fine technical editing, expertise, and
review. I have graduated from reading his blog to reading his comments and
suggestions.
—David Hucaby
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Introduction
Part I Wireless Design (ENWLSD)
Chapter 1 Wireless Design Requirements
Chapter 2 Conducting an Offsite Site Survey
Chapter 3 Conducting an Onsite Site Survey
Chapter 4 Physical and Logical Infrastructure Requirements
Chapter 5 Applying Wireless Design Requirements
Chapter 6 Designing Radio Management
Chapter 7 Designing Wireless Mesh Networks
Chapter 8 Designing for Client Mobility
Chapter 9 Designing High Availability
Part II Wireless Implementation (ENWLSI)
Chapter 10 Implementing FlexConnect
Chapter 11 Implementing Quality of Service on a Wireless
Network
Chapter 12 Implementing Multicast
Chapter 13 Location Services Deployment
Chapter 14 Advanced Location Services Implementation
Chapter 15 Security for Wireless Client Connectivity
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Chapter 17 Device Hardening
Chapter 18 Final Preparation
Chapter 19 ENWLSD 300-425 and ENWLSI 300-430 Exam
Updates
Appendix A Wi-Fi 6 (802.11ax)
Appendix B Software-Defined Access with Wireless
Appendix C RRM TPC Algorithm Example
Appendix D Answers to the “Do I Know This Already?” Quizzes and
Review Questions
Glossary
Index
Online Element
Appendix E Study Planner
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Introduction
Part I Wireless Design (ENWLSD)
Chapter 1 Wireless Design Requirements
“Do I Know This Already?” Quiz
Foundation Topics
Following a Design Process
Evaluating Customer Requirements
Evaluating Client Requirements
Examining Client 802.11 Capabilities
Examining Client RF Capabilities
Examining Client Security Capabilities
Examining Client Density
Choosing AP Types
Evaluating Security Requirements
AP Deployment Models
Data Deployment Model
Voice/Video Deployment Model
Location Deployment Model
AP Deployment Model Summary
Summary
Exam Preparation Tasks
Review All Key Topics
Define Key Terms
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“Do I Know This Already?” Quiz
Foundation Topics
The Effect of Material Attenuation on Wireless Design
Common Deployment Models for Different Industries
Enterprise Office
Small or Home Offices
Healthcare
Hospitality and Hotels
Hotspots
Education
Retail
Warehousing
Manufacturing
Designing with Regulations in Mind
Choosing the Right Survey Type
A Survey of Wireless Planning Tools
Conducting a Predictive Site Survey
Summary
References
Exam Preparation Tasks
Review All Key Topics
Define Key Terms
Chapter 3 Conducting an Onsite Site Survey
“Do I Know This Already?” Quiz
Foundation Topics
Performing a Walkthrough Survey
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L1 Sweep Tool Essentials
Interferer Types and Effects
Surveying for Interferers
Performing a Layer 2 Survey
The Site Survey Process
Data Versus Voice Versus Location Deployments
Performing a Post-Deployment Onsite Survey
Summary
References
Exam Preparation Tasks
Review All Key Topics
Define Key Term
Chapter 4 Physical and Logical Infrastructure Requirements
“Do I Know This Already?” Quiz
Foundation Topics
Physical Infrastructure Requirements
PoE and PoE+
UPOE and UPOE+
Power Injectors
MultiGigabit
Mounting Access Points
Ceiling and Wall Mounting Access Points
Mounting Access Points Below a Suspended
Ceiling
Mounting Access Points Above the Ceiling Tiles
Grounding and Securing Access Points
Logical Infrastructure Requirements
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AAA and DHCP Services Logical Path
Licensing Overview
Right to Use Licensing
Smart Licensing
Summary
References
Exam Preparation Tasks
Review All Key Topics
Define Key Terms
Chapter 5 Applying Wireless Design Requirements
“Do I Know This Already?” Quiz
Foundation Topics
Defining AP Coverage
Considering Receive Sensitivity
Considering the Signal-to-Noise Ratio
Further AP Cell Considerations
Expanding Coverage with Additional APs
Designing a Wireless Network for Data
Designing a Wireless Network for High Density
Limiting the Transmit Power Level
Leveraging APs and Antennas
Designing a Wireless Network for Voice and Video
Designing a Wireless Network for Location
Summary
Exam Preparation Tasks
Review All Key Topics
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Chapter 6 Designing Radio Management
“Do I Know This Already?” Quiz
Foundation Topics
Understanding RRM
Discovering the RF Neighborhood with NDP
RF Groups
Transmit Power Control (TPC)
Dynamic Channel Assignment (DCA)
Coverage Hole Detection
Flexible Radio Assignment (FRA)
Localizing RRM with RF Profiles
Optimizing AP Cell Sensitivity with RxSOP
Summary
Exam Preparation Tasks
Review All Key Topics
Define Key Terms
Chapter 7 Designing Wireless Mesh Networks
“Do I Know This Already?” Quiz
Foundation Topics
Mesh Network Architecture and Components
Mesh Access Points
Access Point Roles in a Mesh Network
Mesh Network Architecture Overview
Site Preparation and Planning
Supported Frequency Bands
Dynamic Frequency Selection
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Outdoor Mesh
Mesh Convergence and Traffic Flows
Adaptive Wireless Path Protocol
Traffic Flow Through the Mesh
Ethernet Bridging
Cisco Wi-Fi Mesh Configuration
Daisy-Chaining Wireless Mesh Links
Workgroup Bridges
Workgroup Bridging Overview
Configuring Workgroup Bridges
Summary
References
Exam Preparation Tasks
Review All Key Topics
Define Key Terms
Chapter 8 Designing for Client Mobility
“Do I Know This Already?” Quiz
Foundation Topics
Roaming Review
Autonomous APs
Intra-Controller (Layer 2) Roam
Inter-Controller (Layer 2) Roam
Inter-Controller (Layer 3) Roam
Organizing Roaming Behavior with Mobility Groups
Defining the Mobility Hierarchy
Exploring Mobility Operations
Validating the Mobility Hierarchy and Tunneling
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Optimizing the AP Scanning Process
Optimizing with CCX Assistance
Optimizing with 802.11k Assistance
Optimizing with 802.11v Assistance
Optimizing Security Processes for Roaming
RSN in a Nutshell
PMKID Caching or SKC Caching
Opportunistic Key Caching (OKC)
Preauthentication
CCKM
802.11r: Fast BSS Transition (FT)
Fast Secure Roaming Review
Summary
Exam Preparation Tasks
Review All Key Topics
Define Key Terms
Chapter 9 Designing High Availability
“Do I Know This Already?” Quiz
Foundation Topics
Making Controller Connectivity More Resilient
Designing High Availability for APs
AP Prioritization
Detecting a Controller Failure
AP Fallback
Designing High Availability for Controllers
N+1 Redundancy
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N+N+1 Redundancy
SSO Redundancy
Summary
Exam Preparation Tasks
Review All Key Topics
Define Key Terms
Part II Wireless Implementation (ENWLSI)
Chapter 10 Implementing FlexConnect
“Do I Know This Already?” Quiz
Foundation Topics
Remote Office Wireless Deployment Modes
FlexConnect Overview and Requirements
Modes of Operation
WAN Requirements for FlexConnect
Implementing FlexConnect with AireOS
Converting the AP to FlexConnect Mode
Configuring the Locally Switched WLANs
Configuring the Native VLAN and WLAN-to-
VLAN Mapping
Implementing FlexConnect Groups
FlexConnect High Availability and Resiliency
FlexConnect Resiliency Scenarios
AAA Survivability
Configuring AAA Survivability
CAPWAP Message Aggregation
FlexConnect ACLs
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FlexConnect Split Tunneling (Using the Split
ACL Mapping Feature)
FlexConnect Smart AP Image Upgrades
Implementing FlexConnect with IOS XE Controllers
A Summary of FlexConnect Best Practice
Recommendations
Office Extend
ME and EWC
Summary
References
Exam Preparation Tasks
Review All Key Topics
Define Key Terms
Chapter 11 Implementing Quality of Service on a Wireless
Network
“Do I Know This Already?” Quiz
Foundation Topics
An Overview of Wireless QoS Principles
The Distributed Coordination Function
Retrofitting DCF: Enhanced Distributed Channel
Access (EDCA)
Access Categories
Arbitration Interframe Space Number (AIFSN)
Contention Window Enhancements
Transmission Opportunity (TXOP)
802.11 Traffic Specification (TSpec)
Implementing QoS Policies on Wireless Controllers
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Client and Controller
Handling QoS Ceilings for the WLAN
Implementing QoS on an IOS XE Controller
Implementing QoS on an AireOS Controller
Implementing QoS for Wireless Clients
Implementing Client QoS Marking Schemes
Implementing Application Visibility and Control
Implementing AVC on a Cisco Wireless
Controller
Summary
References
Exam Preparation Tasks
Review All Key Topics
Define Key Terms
Chapter 12 Implementing Multicast
“Do I Know This Already?” Quiz
Foundation Topics
Multicast Overview
Multicast Delivery in a Wireless Network
IGMP Snooping
Implementing Wireless Multicast
Implementing mDNS
Implementing Multicast Direct
Summary
References
Exam Preparation Tasks
Review All Key Topics
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Chapter 13 Location Services Deployment
“Do I Know This Already?” Quiz
Foundation Topics
Indoor Location
Indoor Location Protocols
Infrastructure and 802.11-Based Location
Cell of Origin Techniques
RSSI Trilateration Techniques
Angle of Arrival (AoA) Techniques
802.11 Frames Used for Location
Precision Versus Accuracy
Deploying Location Services
Location Engines and Services
Configuring APs and WLCs for Location Support
Deploying Cisco Spaces and CMX
Initial Installation
CMX Deployment Configuration
Cisco Spaces Deployment
Configuration
Tracking Clients, RFID Tags, Rogues, and Interferers
Tracking Mobile Devices with CMX
Tracking Mobile Devices with Cisco Spaces
Customizing Location Services
Customizing CMX Location Services
Customizing Cisco Spaces Location Services
Summary
References
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