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WAN Technologies: Important Points of Interest, Part 3 of 3
By Sean Wilkins
Jan 13, 2016
Concluding this three-part series on WAN technologies, Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, Academic Edition, discusses how satellite, wireless data, and leased lines are used as part of a networking solution.
WAN Technologies: Important Points of Interest, Part 2 of 3
By Sean Wilkins
Jan 6, 2016
In Part 2 of a three-part series, Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, Academic Edition, reviews popular low-end and mid-grade offerings for Internet access: dial-up, ISDN, DSL, and cable.
Measuring Network Complexity
By Russ White, Jeff (Evgeny) Tantsura
Dec 30, 2015
In this chapter from Navigating Network Complexity: Next-generation routing with SDN, service virtualization, and service chaining, the authors begin by examining some methods proposed to measure network complexity, and then consider ordered versus unordered complexity. Finally, they examine several realms of complexity that will lead to practical applications.
WAN Technologies: Important Points of Interest, Part 1 of 3
By Sean Wilkins
Dec 29, 2015
In the first article of a three-part series, Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, Academic Edition, provides an overview of some of the wide area networking (WAN) technologies that network engineers need to know to get that first job in the industry, or to move up in their chosen field.
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.
Foundations of Modern Networking: Background and Motivation of Software-Defined Networks (SDN)
By William Stallings
Dec 3, 2015
This chapter from Foundations of Modern Networking: SDN, NFV, QoE, IoT, and Cloud begins the discussion of software-defined networks (SDNs) by providing some background and motivation for the SDN approach.
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.
Inner Workings of the Domain Name System (DNS)
By Sean Wilkins
Nov 24, 2015
When you type an address into a browser and hit Enter, you expect to arrive at the intended website. Without the Domain Name System (DNS), that wouldn't happen. Whether simple or very complex, networks worldwide rely on the DNS to connect client and target. Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, explains how DNS connects one person or server with another, and why you need to know about this undervalued service.
Five (or Six) Things That Will Make You a DHCP Wizard
By Sean Wilkins
Nov 17, 2015
You're probably using the Dynamic Host Configuration Protocol (DHCP) right now, as you read this article. Surprised? Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, explains what you need to know about the use of DHCP in modern communications.
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.
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.
Common Protocols for Virtual Private Networks (VPNs)
By Sean Wilkins
Oct 22, 2015
Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, discusses some of the protocols used on modern virtual private networks.
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.
Basic Layer 3 Routing Concepts
By Sean Wilkins
Oct 6, 2015
How does a message get from point A to point B on a network? Though the question may seem simple, the process isn't. Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, discusses how basic packet routing works.
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.
Five Crucial Commands for Verifying Cisco Switch Network Status and Operational State
By Sean Wilkins
Aug 11, 2015
A network engineer needs to be conscious of the state of the network and every device connected to it. But when your network consists of multiple devices connected at a distance, how can you test connections and keep on top of network performance? Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, discusses five basic commands you need to know and use correctly to maintain your Cisco network.
Nine Switch Commands Every Cisco Network Engineer Needs to Know
By Sean Wilkins
Aug 4, 2015
Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, provides a quick overview of nine commands that are essential for working with Cisco networks, whether or not your goal is certification.
Network Switching Methods: Store-and-Forward Versus Cut-Through
By Sean Wilkins
Jul 28, 2015
Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, believes every network engineer should understand the differences between the two major switching methods employed in computer networks. This overview discusses the two methods from their initial deployments to modern usage.
Packet Switching Methods on Cisco Networks
By Sean Wilkins
Jul 14, 2015
Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, teaches new networking students the basics they need to know about packet switching on Cisco networks. Experienced network engineers will find this article a useful refresher course on Cisco technology.
VLAN Communications: Making Networks Talk to Each Other
By Sean Wilkins
Jul 7, 2015
Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, discusses routing and communications options for virtual networks in various configurations.

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