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Domain 6 – Networking and Telecom

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Agenda 1

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OSI Model

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OSI Layers

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Networking Communications

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An Older Model

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Data Encapsulation

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Application Layer

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Presentation Layer

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OSI – Presentation Layer

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OSI – Session Layer

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Client/Server Model

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Client/Server Session Layer

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Transport Layer

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OSI – Network Layer

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Here to There

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Network Layer

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OSI – Data Link

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Data Link

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Sublayers

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OSI – Physical Layer

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Physical Layer

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Layers Working Together

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Protocols at Each Layer

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Devices Work at Different Layers

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Types of Networks

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Network Topologies – Physical Layer

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Topology Type – Bus

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Topology Type – Ring

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Topology Type – Star

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Network Topologies – Mesh

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Summary of Topologies

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Agenda 2

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Media Access

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One Goal of Media Access Technologies

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Collision Domain

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Back Off, Buddy

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Carrier Sense Multiple Access

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CSMA/Collision Avoidance (CSMA/CA)

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Media Access Technologies – Ethernet

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Media Access Technologies – Token Passing

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Token’s Role

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Other Technologies

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Media Access Technologies – Polling

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Agenda 3

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Cabling Types – Twisted Pair

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Cable Types

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Multimode versus Single Mode

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Signal and Cable Issues

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Signaling Issues

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Transmission Types – Analog and Digital

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Transmission Types – Synchronous

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Asynchronous

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Transmission Types

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Cabling Issues – Plenum-Rated

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Transmission Types – Number of Receivers

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Internet Group Management Protocol

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Multicasting

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Network Technologies

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Extranet

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Network Technologies (Cont.)

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EDI Evolution

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Networking Devices

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Forwarding Table Example

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Network Devices – Switch

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Virtual LAN

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VLAN

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Interfaces and VLANs

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Sniffers

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Networking Devices – Router

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Hops

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Routers

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Bridges Compared to Routers

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Network Devices – Gateway

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Agenda 4

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Client Ports

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Conceptual Use of Ports

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TCP/IP Suite

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UDP versus TCP

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TCP Segment

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SYN Flood

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Teardrop Attack

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Source Routing

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Source Routing Types

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IP Address Ranges

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IPv6

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Protocols – ARP

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IP to MAC Mapping

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How ARP Works

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ARP Poisoning

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ICMP Packets

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A Way Hackers Use ICMP

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Ping Steps

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Protocols – SNMP

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SNMP in Action

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SNMP

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SNMP Output

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POP3 and SMTP

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Protocols – SMTP

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Protocols – FTP, TFTP, Telnet

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Protocols – RARP and BootP

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DHCP – Dynamic Host Configuration Protocol

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Agenda 5

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Network Configurations

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DMZ Configurations

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Firewall Comparisons

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Network Devices – Firewalls

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Packet Filtering Firewall

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Packet Filtering Firewall Weaknesses

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Packet Filtering

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Rule Set Example

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Firewall Types

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Application-Layer Proxy Advantages

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Application-Layer Proxy Disadvantages

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Dedicated Proxy Servers

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Firewall Types – Stateful

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State Table

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Firewall Types – Kernel Proxies

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Firewall Based VPN Devices

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Best Practices

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Firewall Placement

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Packet Filtering (Cont.)

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Screened Host

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Firewall Architecture Types – Multi- or Dual-Homed

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Screened Subnet

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Agenda 6

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Dial-Up Protocol – SLIP

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Dial-Up Protocol – PPP

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PPP

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PPP versus SLIP

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Authentication Protocols – PAP

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Authentication Protocols – CHAP

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Authentication Protocol – EAP

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Data Inspection

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Virtual Private Network Technologies

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Analogy

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Tunneling Protocols – Examples

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Tunneling Protocols – PPTP

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Tunneling Protocols – L2TP

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L2TP Encapsulation

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Tunneling Protocols – IPSec

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IPSec Basic Features

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IPSec Modes

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Security Associations (SAs)

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Combining Sas

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Iterated Tunnelling

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Agenda 7

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Layer 3 at Layer 2

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MPLS

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Multiprotocol Label Switching

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Quality of Service (QoS)

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QoS Services

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Autonomous Systems

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Routing Protocols

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Routing

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Routing Protocols (Cont.)

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OSPF

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IGRP

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BGP

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Routing Protocol Attacks

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MAN Technologies

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Connecting Networks

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Network Services

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Name Resolving Steps

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Split DNS

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Host Name Resolution Attacks

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Network Service – NAT

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NIS

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Storing Data

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NIS+ Authentication

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Agenda 8

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PSTN

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Circuit Switching

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Steps of Connections

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Multiplexing

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Types of Multiplexing

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TDM Process

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FDM

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Packet Switching

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Circuit versus Packet Switching

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WAN Technologies – Packet Switched

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WAN Technologies – X.25

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X.25

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WAN Technologies – Frame Relay

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WAN Example

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Frame Relay

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WAN Technologies – ISDN

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WAN Technologies – DSL

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WAN Technologies – Cable Modem

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Cable Modems

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Cable Network

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Satellites

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Hybrid Connection

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Satellite Coverage

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Network Perimeter Security

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Complexity Only Increases

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A Layered Approach

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Agenda 9

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PSTN (Cont.)

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Private Branch Exchange

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PBX Vulnerabilities

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PBX Best Practices

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Voice Over IP

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Media Gateways

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PBX and VoIP

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Voice over…

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IP Telephony Issues

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Telephony Protection Mechanisms

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Telephony Security

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IP Telephony with Wireless

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IP Phones Security

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Mobile Technology Generations

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Mobile Phone Security

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Mobile Device Security

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Cell Phone

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Agenda 10

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Wireless Frequencies

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Alphabet Soup of Standards

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Spread Spectrum

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OFDM

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Where Does Spread Spectrum Work?

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802.11n

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Wireless Technologies – Access Point (Cont.)

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Architectures

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Wireless Technologies – Service Set ID

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Authenticating to an AP

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802.11 Authentication

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Wireless Technologies – WEP

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Wireless Technologies – More WEP Woes

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Lack of Integrity

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WEP Security Issues

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Frequency Management

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802.11 Security Solutions

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802.1x

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802.1x Authentication

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Types of 802.11 Security

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IEEE 802.11i Standard

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Wireless EAP

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Wireless Technologies – Common Attacks

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Wireless Reconnaissance Output

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Warchalking

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Countermeasures

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Wireless Attacks

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Wormhole Attack

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Wireless Technologies – WAP

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Wireless Technologies – WTLS

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i-mode

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Bluetooth

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Instant Messaging

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Domain 6 Review