CCNA 1 |
| IP Addressing |
IP Addressing and Subnetting for New Users
Subnet Zero and All-Ones Subnet
Using 31-bit Prefixes on Ipv4 Point-to-Point Links RFC 3021
Subnet Spreadsheet (20KB)
VLSM Spreadsheet (20KB)
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| Wireless and Wireless Security |
WikiPedia 802.11
www.wi-fi.org
Network World Wireless Security Article
wi-fi.org Security Article
Microsoft WPA Setup
WiFi Protected Access (WPA) Weaknesses
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| Cabling LANs and WANs |
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Various Cables
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| TCP/IP |
Wikipedia Articles on Transmission Control Protocol
John Kristoff's Overview of TCP
RFC 793 - TCP
The Basics of Transmission Control Protocol
TCP Sequence Numbers Explained -- give it time to load and scroll up a bit
Tutorial Articles on TCP/IP Sequence Diagrams
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CCNA 2 |
| General |
Download Cisco E-Simulator (422KB)
Download Cisco ConfigMaker 2.6+
Download Putty Telnet/SSH Software (350KB)
Cisco IOS Command References and Configuration Guides
Password Recovery Procedures for All Cisco Devices
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| Troubleshooting Serial Interfaces |
Troubleshooting Serial Lines
Other Hardware Troubleshooting
T1: A Survival Guide: Ch. 5: Timing, Clocking and Synchronization
Cisco HDLC (cHDLC) and SLARP
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| IOS Naming and Reference Guides |
Cisco IOS Reference Guide – IOS Naming
White Paper: Cisco IOS Reference Guide
How to Download a Software Image to a 2600 Router Using ‘tftpdnld’ in ROMMON
2600 Series Router Architecture - Memory
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| Distance Vector Routing Protocols |
Configuring RIP
Behavior of RIP and IGRP When Sending and Receiving Updates
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| Configuring Access Control Lists |
IP Access Lists Configuration Guide (47KB)
Access List Resource Document (35KB)
Reflexive Access Lists Commands
Reflexive Access Lists and Established Keyword
Filtering Routing Information
Configuring Commonly used IP Access Lists
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CCNA 3 |
| OSPF |
Cisco IOS OSPF Exploit and Cisco Response – securityfocus.com
Dot1q Trunking with 2600 Routers (Native cmd)
Basic OSPF
OSPF FAQs
OSPF Stuck in 2-way State
OSPF Design Guide
Configuring OSPF – Configuration Guide
OSPF Commands – 12.0 Command Reference
RIP and OSPF Redistribution
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| EIGRP |
Cisco – Introduction to EIGRP
EIGRP Technical Details
EIGRP and Route Redistribution (41KB)
Route Selection in Cisco Routers
What is Administrative Distance?
Filtering Routing Information
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| Switching – Catalyst 2950 |
Catalyst 2950 Tech Notes
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide, 12.1(22)EA25
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| Catalyst 2950/3550 and 2900XL/3500XL IOS Upgrades |
Upgrading Software Images on Catalyst 2950 and 2955 Series Switches Using the Command Line Interface
Upgrading Software in Catalyst 2900XL and 3500XL Switches Using the Command Line Interface
Recovering Catalyst 2950, 2955, 3550 Switches from Corrupt or Missing IOS
Recovering Catalyst 2900XL and 3500XL Switches from Corrupt or Missing IOS
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| Spanning Tree |
Configuring STP on Catalyst 2950
Understanding Rapid Spanning Tree 802.1w
Understanding Spanning-Tree Protocol Topology Changes
Spanning Tree Technical Support
Configuring Optional Spanning Tree Features
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| VLANs, Trunking and Etherchannel |
Understanding EtherChannel Load Balancing and Redundancy
Configuring EtherChannels on Catalyst 2950
InterSwitch Link and IEEE 802.1Q Frame Format
Understanding and Configuring VLAN Trunking Protocol
Etherchannel, 802.1Q Trunking and Inter-VLAN Routing
Configuring Routing Between VLANs with IEEE 802.1Q Encapsulation
LAN Trunking Configuration Examples
Configuring Inter-VLAN Routing and ISL/802.1Q Trunking with External Router
‘switchport trunk native vlan [vlan id]’ Command with Native Explanation
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CCNA 4 |
| Network Address Translation (NAT) |
Verifying NAT Operation and Basic NAT Troubleshooting
Configuring Static and Dynamic NAT Simultaneously
NAT on a Stick
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| Dynamic Host Configuration Protocol (DHCP) |
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DHCP Option 82 – RFC 3046
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| Troubleshooting Cisco Serial Interfaces |
Cisco WAN Interface Cards
Troubleshooting Serial Line Problems
DTR, DTS, CTS....
Troubleshooting Serial Lines
Hardware Troubleshooting for the Cisco 2600 Series Router
T1: A Survival Guide: Ch. 5: Timing, Clocking and Synchronization…
Wikipedia T-Carrier
All You Wanted to Know About T1 But Were Afraid to Ask
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| Circuit Switching vs. Packet Switching |
Circuit Switching vs. Packet Switching article (Cram Session)
Circuit Switching vs. Packet Switching Simulation
Google Search Results on Packet Switching vs. Circuit Switching
Network Magazine: Switching vs. Routing
http://en.wikipedia.org/wiki/Dedicated_lines
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| Point-to-Point Protocol (PPP) |
Understanding and Configuring PPP CHAP Authentication
Configuring and Troubleshooting PPP Password Authentication Protocol (PAP)
Configuring a Username Different from the Routers Hostname
Troubleshooting PPP (CHAP or PAP) Authentication
Understanding Debug PPP Negotiation Output
PPP Commands for Wide Area Networking
Point-to-Point Protocol – Technical Documentation – Tech Notes
Point-to-Point Protocol – Technical Documentation – Configuration Examples
Enhanced Password Security
IETF PPP Multilink RFC
PPP Multilink Across Multiple BRI Channels
PPP Multilink on Synchronous Serial Interfaces
Understanding Data Compression
WAN Compression FAQs
Compressing TCP Headers
PPP over ISDN
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| ISDN |
ISDN Glossary
Overview of Interfaces, Controllers and Lines Used for Dial Access
Understanding the WIC-1B-U Interface Card
CCIE Study Group – Removing Legacy DDR from BRI interface
Configuring BRI Backup Interface with Dialer Profiles
‘sho dialer’ command reference
Configuring BRI-to-BRI Dial up with DDR Dialer Map
Troubleshooting Dial Technology Connectivity
CCIE Group Study – Difference Between T1 and ISDN PRI
CCIE Group Study – ISDN DDR Static Mapping Case Study
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| Frame Relay |
Alliance Datacom AT&T Frame Relay and ATM article
Frame Relay FAQs
Configuring Frame Relay
Comprehensive Guide to Configuring and Troubleshooting Frame Relay
Frame Relay Commands for 12.2 IOS
System Management Configuration Guides
http://www.snmplink.org/
Cisco SNMP Page
Networking Professionals Connection
Improving Security on Cisco Routers
Cisco Security Advisory: Malformed SNMP Message-Handling Vulnerabilities
Troubleshooting the Configuration on the Virtual Access Terminal – logging to telnet
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