- WAN Technologies: Important Points of Interest, Part 3 of 3
- 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.
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- WAN Technologies: Important Points of Interest, Part 2 of 3
- 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.
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- WAN Technologies: Important Points of Interest, Part 1 of 3
- 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.
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- TACACS+ vs. RADIUS: Similarities and Differences
- 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.
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- Network Address Translation (NAT) Implementation Methods
- 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.
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- Inner Workings of the Domain Name System (DNS)
- 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.
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- Five (or Six) Things That Will Make You a DHCP Wizard
- 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.
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- Network Routing Protocols and Methods, Part 2
- 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.
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- Network Routing Protocols and Methods, Part 1
- 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.
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- Common Protocols for Virtual Private Networks (VPNs)
- 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.
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- Routers and Switches and Hubs, Oh My! An Introduction to Network Devices and Their Functions
- 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.
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- Basic Layer 3 Routing Concepts
- 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.
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- Mitigation Technologies for E-mail-Based and Web-Based Threats
- 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.
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- VLAN Configuration Fundamentals and Commands
- Jun 15, 2015
- After becoming familiar with basic VLAN concepts, you need to learn how to configure your organization's networks and devices. Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, discusses important concepts and commands you will use in setting up networks and getting devices to talk to each other.
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- Virtual vs. Physical LANs: Device Functionalities
- 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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- Basic Data Transmission in Networks: MAC Tables and ARP Tables
- May 12, 2015
- Bombarded with jargon, no wonder networking beginners get lost. Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, explains some crucial terminology for anyone who needs to understand complex networking.
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- Collision Domains and Broadcast Domains = Apples and Oranges
- May 5, 2015
- Sean Wilkins, co-author of CCNA Routing and Switching 200-120 Network Simulator, doesn't approve of blurring collision domains and broadcast domains. Though these models are often taught together, modern technology has outpaced some of the ideas, and networking specialists who are new to the field need to distinguish between current terminology and outdated concepts.
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- Introduction to 31 Days Before Your CCNA Routing and Switching Exam
- May 19, 2014
- Allan Johnson provides a list of recommended resources to assist in your preparation for taking the CCNA Routing and Switching Exam. He also provides a brief introduction to the CCNA 200-201 Exam itself.
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- CCNA Routing and Switching Practice and Study Guide: Link Aggregation
- May 16, 2014
- To help you prepare for the ICND2 200-101 Certification Exam, this chapter explains the concepts behind and configuration strategies for link aggregation: creating one logical link using multiple physical links between two devices.
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- CCNA Routing and Switching Practice and Study Guide: LAN Redundancy
- May 15, 2014
- To help you prepare for the ICND2 200-101 Certification Exam, this chapter investigates how Spanning Tree Protocol (STP) logically blocks physical loops in the network and how STP has evolved into a robust protocol that rapidly calculates which ports should be blocked in a VLAN-based network.
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