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xxix
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Chapter 14, "SNA Topologies"
--This chapter discusses some common Token Ring designs, various
DLSw+ designs and methods of controlling broadcasts with border peers, and various methods of
implementing QoS with DLSw+. You'll read descriptions of the different timers available and when it
might be practical and effective to apply them. Also covered are redundancy and load balancing, dual-
backbone Token Ring design, DLSw+ design, minimizing explorer replication, border peer design,
configuring traffic priority, queuing algorithms, and priority and custom queuing for DLSw+.
·
Chapter 15, "Network Security Technologies"
--This chapter examines the underlying security tech-
nologies and their components, the common firewalls available, where firewalls fit into a corporate
design, and Cisco IOS features for firewalls. Also covered are the concept of IPSec and some of the
algorithms it uses, including DES and SHA encryption technologies, VPN concepts and tunneling
mechanisms, L2TP and L2F protocols, technology weaknesses, and configuration weaknesses. You'll
read about firewall design, packet-filtering routers, application proxy, stateful filtering, the Demilita-
rized Zone (DMZ), Network Address Translation (NAT), IP spoofing, inbound and outbound access
lists, Content-Based Access Control (CBAC), IP Security (IPSec), Authentication Header (RFC 2402),
Public Key Technology (PKI), hashing algorithms, digital signatures, MD5 (Message Digest 5), Inter-
net Key Exchange (IKE), Data Encryption Standard (DES), Virtual Private Networks (VPNs), Layer 2
Tunneling Protocol (L2TP), and L2TP Access Concentrator (LAC).
·
Chapter 16, "Voice"
--This chapter reviews the traditional voice environment, addresses the chal-
lenges that the design professional faces when engineering voice over data, and addresses QoS for
voice and why voice traffic needs guarantees to ensure timely delivery. You'll read about PBX and key
systems, designing voice over data networks, analog and digital signaling, tandem switching, Signaling
System 7, addressing and dial plans, voice over ATM, VoATM addressing, Voice over Frame Relay,
VoIP and delay, the H.323 family, Cisco CallManager version 3.0, QoS for packetized voice, Cisco end-
to-end QoS services, traffic engineering, traffic measurement units, and calculating the number of
trunks.
Sample test questions and the testing engine on the CD offer simulated exams for final practice.
Each of these chapters uses several features to help you make the best use of your time in that chapter:
·
"Do I Know This Already?" Quiz and Quizlets
--Each chapter begins with a quiz that helps you
determine the amount of time you need to spend studying that chapter. The quiz is divided into parts
called "quizlets" that correspond to a section of the chapter. If you follow the directions at the begin-
ning of each chapter, the "Do I Know This Already?" quiz will direct you to study all or particular parts
of the chapter.
·
Foundation
Topics
--This is the core section of each chapter. It explains the protocols, concepts, and
configuration for the topics in the chapter.
·
Foundation Summary
--Near the end of each chapter, a summary collects the most important tables
and figures from the chapter. The Foundation Summary section is designed to help you review the key
concepts in the chapter if you score well on the "Do I Know This Already?" quiz. This section is an
excellent tool for last-minute review.
·
Q&A
--These end-of-chapter questions focus on recall, covering topics in the Foundation Topics sec-
tion by using several types of questions. Because the "Do I Know This Already?" quiz questions can
help increase your recall, they are restated in the Q&A section. Restating these questions, along with
offering new questions, provides a larger set of practice questions for when you finish a chapter and for
final review when your exam date is approaching.
87200333.book Page xxix Wednesday, August 22, 2001 2:18 PM