Chapter 1 - Building a Simple Network
Building a Simple Network
Common Physical Components of a Network
Interpreting a Network Diagram
Resource-Sharing Functions and Benefits
Network User Applications
Impact of User Applications on the Network
Characteristics of a Network
Physical Topology Categories
Logical Topologies
Bus Topology
Star Topology
Extended-Star Topology
Ring Topology
Dual-Ring Topology
Full-Mesh Topology
Partial-Mesh Topology
Connection to the Internet
Demo - Network Topology
Summary
Securing the Network
Closed/Open Networks
Threat Capabilities— More Dangerous and Easier to Use
E-Business Challenge
Adversaries, Adversary Motivations, and Classes of Attack
Common Threats
Password Attack Threat Mitigation
Summary
Understanding the Host-to-Host Communications Model
Understanding Host-to-Host Communications
Why a Layered Network Model?
The Seven Layers of the OSI Model
Data Encapsulation/De-Encapsulation
Peer-to-Peer Communication
Demo - OSI Model
TCP/IP Stack
TCP/IP Stack vs. the OSI Model
Summary
Understanding the TCP/IP Internet Layer
Internet Protocol Characteristics
Why IP Addresses?
IP PDU Header
IP Address Format: Dotted Decimal Notation
IP Address Classes: The First Octet
IP Address Ranges
Reserved Address
Public IP Addresses
Private IP Addresses
Demo - IP Address Basics
DHCP
DNS
Network Connection
ipconfig
Summary
Understanding the TCP/IP Transport Layer
Transport Layer
Reliable vs. Best-Effort Comparison
UDP Characteristics
UDP Header
TCP Characteristics
TCP Header
TCP/IP Application Layer Overview
Mapping Layer 3 to Layer 4
Mapping Layer 4 to Applications
Establishing a Connection
Three-Way Handshake
Flow Control
TCP Acknowledgment
Fixed Windowing
TCP Sliding Windowing
TCP Sequence and Acknowledgment Numbers
Demo - TCP
Summary
Exploring the Packet Delivery Process
Layer 1 Devices
Layer 2 Devices
Layer 2 Addressing
Layer 3 Devices and Their Function
Layer 3 Addressing
ARP
ARP Table
Host-to-Host Packet Delivery
Default Gateway
Demo - Protocols
Host-Based Tools: ping
Host-Based Tools: Table
Host-Based Tools: tracert
Summary
Understanding Ethernet
Local Area Network
LAN Components
Functions of a LAN
LAN Sizes
Ethernet Evolution
LAN Standards
CSMA/CD
Ethernet Frame Structure
Communicating Within the LAN
MAC Address Components
MAC Addresses
Summary
Connecting to an Ethernet LAN
Network Interface Card
Comparing Ethernet Media Requirements
Differentiating Between Connections
1000BASE-T GBIC
Cisco Fiber-Optic GBICs
Unshielded Twisted-Pair Cable
RJ-45 Connector
RJ-45 Jack
UTP Implementation (Straight-Through/Crossover)
UTP Implementation: Straight-Through vs. Crossover
Using Varieties of UTP
Summary
Chapter 1 Review
Chapter 2 - Ethernet LANs
Ethernet LANs
LAN Segment Limitations
Extending LAN Segments
Collisions
Multiple Collision Domains
Summary
Solving Network Challenges with Switched LAN Technology
Network Congestion
Bridges
LAN Switch
LAN Switch Features
Switches Supersede Bridges
Switching Frames
LANs Today
VLAN Overview
Summary
Exploring the Packet Delivery Process
Layer 2 Addressing
Layer 3 Addressing
Host-to-Host Packet Delivery
Summary
Operating Cisco IOS Software
Cisco IOS Software
Configuring Network Devices
An Overview of Cisco Device Startup
External Configuration Sources
Cisco IOS User Interface Functions
Cisco IOS Software EXEC Mode (User)
Cisco IOS Software EXEC Mode (Privileged)
Switch Command-Line Help Facilities
Context-Sensitive Help
Enhanced Editing Commands
Router Command History
Demo - Basic CLI
Viewing the Configuration
show running-config and show startup-config Commands
Summary
Starting a Switch
Initial Startup of the Catalyst Switch
Catalyst 2960 Switch LED Indicators
Initial Bootup Output from the Catalyst 2960 Switch
Initial Configuration of the Catalyst 2960 Switch Using Setup
Logging In to the Switch and Entering the Privileged EXEC Mode
Configuring the Switch
Configuring Switch Identification
Configuring the Switch IP Address
Configuring the Switch Default Gateway
Saving Configurations
Showing Switch Initial Startup Status
Switch show version Command
Switch show interfaces Command
Managing the MAC Address Table
Demo - Switch Configuration
Summary
Understanding Switch Security
Common Threats to Physical Installations
Configuring a Switch Password
Configuring the Login Banner
Telnet vs. SSH Access
Configuring Port Security
Verifying Port Security on the Catalyst 2960 Series
Securing Unused Ports
Disabling an Interface (Port)
Summary
Maximizing the Benefits of Switching
Microsegmentation
Duplex Overview
Setting Duplex and Speed Options
Showing Duplex Options
The Hierarchy of Connectivity
Loops
Spanning Tree Protocol
Summary
Troubleshooting Switch Issues
The Layered Approach
Switched Media Issues
show interface
Excessive Noise
Excessive Collisions
Late Collisions
Port Access Issues
Duplex-Related Issues
Speed-Related Issues
Configuration Issues
Summary
Chapter 2 Review
Chapter 3 - Wireless LANs
Wireless LANs
Market Trends
Differences Between WLAN and LAN
Radio Frequency Transmission
Organizations That Define WLAN
ITU-R with FCC Wireless
IEEE 802.11 Standards Comparison
Wi-Fi Certification
Summary
Understanding WLAN Security
Wireless LAN Security Threats
Mitigating the Threats
Evolution of Wireless LAN Security
Wireless Client Association
How 802.1X Works on the WLAN
WPA and WPA2 Modes
Summary
Implementing a WLAN
802.11 Topology Building Blocks
BSA Wireless Topology— Basic Coverage
ESA Wireless Topology— Extended Cover
Wireless Topology Data Rates—802.11b
Access Point Configuration
Steps to Implement a Wireless Network
Wireless Clients
Common Wireless Network Issues
Wireless Troubleshooting
Summary
Chapter 3 Review
Chapter 4 - LAN Connections
LAN Connections
Routers
Router Functions
Path Determination
Routing Tables
Routing Table Entries
Routing Metrics
Distance Vector Routing Protocols
Link-State Routing Protocols
Summary
Understanding Binary Basics
Decimal vs. Binary Numbers
Decimal and Binary Numbers Chart
Powers of 2
Decimal-to-Binary Conversion
Binary-to-Decimal Conversion
Demo - Conversion
Summary
Constructing a Network Addressing Scheme
Flat Topology
Subnetworks
What a Subnet Mask Does
Possible Subnets and Hosts for a Class C Network
Possible Subnets and Hosts for a Class B Network
Possible Subnets and Hosts for a Class A Network
End System Subnet Mask Operation
How Routers Use Subnet Masks
Applying the Subnet Address Scheme
Demo - Subnetting Part 1
Octet Values of a Subnet Mask
Default Subnet Masks
Procedure for Implementing Subnets
Eight Easy Steps for Determining Subnet Addresses
Example: Applying a Subnet Mask for a Class C Address
Example: Applying a Subnet Mask for a Class B Address
Example: Applying a Subnet Mask for a Class A Address
Demo - Subnetting Part 2
Demo - Subnetting Part 3
Summary
Starting a Router
Initial Startup of the Cisco Router
Bootup Output from the Router
Setup: The Initial Configuration Dialog
Setup Interface Summary
Setup Initial Global Parameters
Setup Initial Protocol Configurations
Setup Interface Parameters
Cisco AutoSecure
Setup Script Review and Use
Logging in to the Cisco Router
Router User-Mode Command List
Router Privileged-Mode Command List
show version Command
Demo - Router Configuration
Summary
Configuring a Cisco Router
Overview of Router Modes
Saving Configurations
Configuring Router Identification
Console-Line Commands
Configuring an Interface
Configuring an Interface Description
Configuring IP Addresses
Router show interfaces Command
Interpreting the Interface Status
Verifying a Serial Interface Configuration
Summary
Exploring the Packet Delivery Process
Layer 2 Addressing
Layer 3 Addressing
Host-to-Host Packet Delivery
Using the show OP Command
ping
traceroute
Summary
Understanding Cisco Router Security
Common Threats to Physical Installations
Configuring a Router Password
Configuring the Login Banner
Telnet vs. SSH Access
Demo - Passwords
Summary
Using the Cisco SDM
Cisco Router and Security Device Manager
What Is Cisco SDM?
Supported Cisco Routers and Cisco IOS Software Releases
Configuring Your Router to Support SDM
SDM Startup
Cisco SDM Main Window Layout and Navigation
Cisco SDM Wizards
Summary
Using a Cisco Router as a DHCP Server
Understanding DHCP
DHCP
Using a Router as a DHCP Server
DHCP Server Using a Router
Additional Tasks
DHCP Pool
Checking the DHCP Configuration
DHCP Pool Status
show ip dhcp conflict
Summary
Accessing Remote Devices
Using Telnet to Connect to Remote Devices
Viewing Telnet Connections
Viewing SSH Connections
Suspending and Resuming a Telnet Session
Demo - Telnet
Closing a Telnet Session
Using the ping and traceroute Commands
Summary
Chapter 4 Review
Chapter 5 - WAN Connections
WAN Connections
Understanding WAN Technologies
Wide-Area Network
Need for WANs
WANs vs. LANs
WAN Access and the OSI Reference Model
WAN Devices
Physical Layer: WANs
Serial Point-to-Point Connections
WAN—Multiple LANs
WAN Data-Link Protocols
WAN Link Options
Summary
Enabling the Internet Connection
Packet Switching
DSL
DSL Service Types Overview
DSL Considerations
Cable-Based WANs
The Global Internet
Getting an Interface Address from a DHCP Server
Network Address Translation
Port Address Translation
Translating Inside Source Addresses
Overloading an Inside Global Address
Gathering the Required Information
Configuring the Client: Interface and Connection
Configuring the Client: WAN Wizard
Configuring the Client: Encapsulation
Configuring the Client: IP Addressing
Configuring PAT: Advanced Options
Configuring PAT: Summary
Verifying the DHCP Client Configuration
Displaying Information with show Commands
Summary
Enabling Static Routing
Router Operations
Identifying Static and Dynamic Routes
Static Routes
Static Route Configuration
Static Route Example
Default Routes
Verifying the Static Route Configuration
Demo - Static Routes
Summary
Configuring Serial Encapsulation
Circuit Switching
Public Switched Telephone Network
PSTN Considerations
Leased Line
WAN Connection Bandwidth
Configuring a Serial Interface
Serial Interface show controller Command
Point-to-Point Considerations
HDLC and Cisco HDLC
Configuring HDLC Encapsulation
Leased Line 2
PPP
An Overview of PPP
Enable PPP Encapsulation
PPP Configuration Example
Verifying a Serial Interface Configuration
Verifying the HDLC and PPP Encapsulation Configuration
Demo - Configuring Serial
Frame Relay
Frame Relay Devices and Virtual Circuits
ATM and Cell Switching
Summary
Enabling RIP
What Is a Routing Protocol?
Autonomous Systems: Interior or Exterior Routing Protocols
Classes of Routing Protocols
Administrative Distance: Ranking Routes
Classful Routing Protocol
Classless Routing Protocol
Distance Vector Routing Protocols
Sources of Information and Discovering Routes
RIP Overview
RIPv1 and RIPv2 Comparison
IP Routing Configuration Tasks
RIP Configuration Example
Verifying the RIP Configuration
Displaying the IP Routing Table
debug ip rip Command
Demo - RIP
Summary
Chapter 5 Review
Chapter 6 - Network Environment Management
Discovering Neighbors on the Network
Cisco Discovery Protocol
Discovering Neighbors with Cisco Discovery Protocol
Using Cisco Discovery Protocol
Using the show cdp neighbors Command
Using the show cdp entry Command
Additional Cisco Discovery Protocol Commands
Creating a Network Map
Demo - CDP
Summary
Managing Router Startup and Configuration
Router Power-On Boot Sequence
Router Internal Components
ROM Functions
Finding the Cisco IOS Image
Loading the Cisco IOS Image from Flash Memory
Loading the Configuration
show running-config and show startup-config Commands
Determining the Current Configuration Register Value
Configuration Register Values
show version Command
show flash Command
Summary
Managing Cisco Devices
Cisco IOS File System and Devices
Managing Cisco IOS Images
Verifying Memory and Deciphering Image Filenames
Creating a Software Image Backup
Upgrading the Image from the Network
Device Configuration Files
Cisco IOS copy Command
Cisco IOS copy Command Example
copy run tftp and copy tftp run Commands
show and debug Commands
Considerations When Using debug Commands
Commands Related to debug
Summary
Chapter 6 Review
Course Closure
