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Mitigation Technologies for E-mail-Based and Web-Based Threats
By Omar Santos, John Stuppi
Sep 29, 2015
This chapter from CCNA Security 210-260 Official Cert Guide covers the Cisco E-mail Security Appliances (ESA) and the Cisco Web Security Appliance (WSA) technologies and solutions in detail. You will learn mitigation technologies such as spam and antimalware filtering, data loss prevention (DLP), blacklisting, e-mail encryption, and web application filtering.
Network Address Translation (NAT) Implementation Methods
By Sean Wilkins
Dec 1, 2015
Have you ever adjusted to a new area code or ZIP code? Everyone needs unique phone numbers and addresses, which is a struggle for the phone companies and the post office. The Internet has the same growing pains on a planetary scale, with everyone's Net-connected devices needing unique IP addresses. Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, explains how Network Address Translation makes it possible for all of us and our gadgets to communicate.
Network Diagram Creation and Interpretation
By Sean Wilkins
Dec 5, 2011
This article is intended to be a primer on network diagrams, what the common symbols are, how the symbols are connected and how to interpret the different connectors on a diagram.
Network Management According to ICND2 Version 2
By Anthony Sequeira
Mar 26, 2013
Anthony Sequeira points out the facts you need to know about networking management technologies that are now part of the CCNA.
Network Routing Protocols and Methods, Part 1
By Sean Wilkins
Nov 3, 2015
In this two-part series, Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, discusses current network routing protocols and methods for implementing them. This article covers the types of static versus dynamic routing protocols and the differences between them.
Network Routing Protocols and Methods, Part 2
By Sean Wilkins
Nov 10, 2015
In the conclusion of this series, Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, explains how to untangle the detailed network information provided by two popular network routing protocols.
OSI and TCP/IP Model Layers
By Sean Wilkins
Nov 22, 2011
Because both the OSI and TCP/IP models are still used when describing modern day protocols, this article will take a look at them both, including their layers and how they can be related to each other.
Routers and Switches and Hubs, Oh My! An Introduction to Network Devices and Their Functions
By Sean Wilkins
Oct 12, 2015
Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, discusses some of the most common network devices that network engineers need to know and understand.
Skill Builder Labs Video Walkthrough from the CCENT/CCNA Network Simulator
By Sean Wilkins
Jan 7, 2014
This video walkthough of the CCENT/CCNA Network Simulator Skill Builder covers a "typical" SB lab, including performing all the steps to complete a lab, Cisco IOS CLI interaction, and grading.
Subnetting Exercise Labs Video Walkthrough from the CCENT/CCNA Network Simulator
By Sean Wilkins
Jan 10, 2014
This video walkthrough of the CCENT/CCNA Network Simulator Subnetting Exercise (SE) covers a "typical" SE Lab, including performing all the steps to complete a lab, Cisco IOS CLI interaction, and grading.
TACACS+ vs. RADIUS: Similarities and Differences
By Sean Wilkins
Dec 8, 2015
If you're responsible for the security of your organization's network, it's important to examine all the possibilities. Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, examines these two long-time AAA favorites, discussing how they protect your network's vital resources.
Tackling the CCNA Exam
By Eric Rivard
Sep 26, 2003
Mastering CCNA certification is not an easy task. Eric Rivard gives you tips on how to successfully pass the CCNA exam the very first time.
The Explosion of Cybercrime
By Darril Gibson
May 23, 2011
This article provides an overview of various types of cyber crime, including cyber extorsion, botnets, morophing malware, and online fraud.
The Ins and Outs of Pearson's Cisco Network Simulator
By Sean Wilkins
Nov 25, 2013
Sean Wilkins takes an in-depth look at the topics that have been added to the new Pearson Cisco Network Simulator as well as a review of some of the commands that are being added.
The TCP/IP and OSI Networking Models
By Wendell Odom
Nov 21, 2011
This chapter explains the terminology and concepts behind TCP/IP. It also explains the terminology behind the OSI networking model in comparison to TCP/IP.
To Route or Not to Route: A Day in the Life of a Router
By Keith Barker
Aug 31, 2011
A lot goes into the decision process regarding routing, and it happens long before a packet arrives at the router for its turn to be forwarded. In this article, the author takes a close look at a day in the life of the router.
Training Never Goes Out of Fashion: An Interview with Wendell Odom
By Linda Leung, Wendell Odom
Jun 9, 2009
Linda Leung talks with Wendell Odom about what people these days really think about the classes, the exams, and the whole idea of certification.
Troubleshooting Scenario Labs Video Walkthrough from the CCENT/CCNA Network Simulator
By Sean Wilkins
Jan 9, 2014
This video walkthough of the CCENT/CCNA Network Simulator Troubleshooting Scenario (TS) covers a "typical" TS Lab, including performing all the steps to complete a lab, Cisco IOS CLI interaction, and grading.
Using Pearson's Cisco Network Simulator
By Sean Wilkins
Nov 25, 2013
Sean Wilkins shows you how Pearson's Cisco Network Simulator product offers a reasonably affordable option for learning the material for the CCNA program while also providing a course-like structure that lends itself to easy learning.
Virtual vs. Physical LANs: Device Functionalities
By Sean Wilkins
May 29, 2015
If you have a good grasp of the basics of local access networks (LANs), it's time to step up your game. Sean Wilkins, co-author of CCNA Routing and Switching ICND2 200-101 Official Cert Guide, explores the concepts behind virtual LANs, how they differ from physical LANs, and why VLANs make sense for modern organizations.

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