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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.

Video: CCNA Wireless 200-355: Control Plane: By Jerome Henry; Nov 24, 2015; In this excerpt from CCNA Wireless 200-355 Complete Video Course, Jerome Henry discusses FlexConnect communication options; specifically, the control plane.

CCDE Study Guide: Enterprise Campus Architecture Design: By Marwan Al-shawi; Nov 23, 2015; In this chapter from CCDE Study Guide, Marwan Al-shawi discusses issues related to enterprise campus architecture design, including hierarchical design models, modularity, access-distribution design model, layer 3 routing design considerations, EIGRP versus link state as a campus IGP, and enterprise campus network virtualization.

Video: CCNA Wireless 200-355: Radio: By Jerome Henry; Nov 20, 2015; In this excerpt from CCNA Wireless 200-355 Complete Video Course, Jerome Henry discusses working with radio in the network interface.

Video: CCNA Wireless 200-355 Complete Video Course: An Overview: By Jerome Henry; Nov 19, 2015; In this excerpt from CCNA Wireless 200-355 Complete Video Course, Jerome Henry introduces the course and what you will learn, covers his qualifications, and discusses why CCNA Wireless as a certification is important and the career opportunities it creates.

Video: ITIL Foundation Exam: The CSI Approach: By Jill Knapp; Nov 19, 2015; This excerpt from ITIL Foundation Exam LiveLessons covers a 6-step improvement process called the CSI Approach.

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.

Video: ITIL Foundation Exam: Business Relationship Management: By Jill Knapp; Nov 17, 2015; This excerpt from ITIL Foundation Exam LiveLessons covers business relationship management, the purpose of which is to establish and maintain a business relationship between the service provider and the customer.

Video: HRCI Certification Exam: What if I Fail?: By Cathy Winterfield, Kelley Snyder; Nov 13, 2015; This excerpt from HRCI Certification Exams: Your Video Coach to Preparing and Passing the Exams covers the importance of having a positive and mindful attitude toward the exam.

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.

CCNA Collaboration CICD 210-060 Official Cert Guide: Managing Endpoints and End Users in CUCM: By Michael Valentine; Nov 9, 2015; This chapter from CCNA Collaboration CICD 210-060 Official Cert Guide reviews the configuration of endpoints and users in Cisco Unified Communications Manager (CUCM), including setting up basic network services, registering phones, configuration, and bulk administration.

Exam Profile: CompTIA Linux+ (LX0-103 and LX0-104) and LPIC-1 (101-400 and 102-400): By Sean Walberg; Nov 4, 2015; Sean Walberg, co-author of CompTIA Linux+ / LPIC-1 Cert Guide, provides important details you need to know to prepare for taking the Linux exams: CompTIA Linux+ (powered by LPI) LX0-103 and LX0-104, or the LPIC-1 101-400 and 102-400 exams.

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.

Video: HRCI Certification Exam: What Can I Expect This Experience to be Like?: By Cathy Winterfield, Kelley Snyder; Oct 26, 2015; In this video from HRCI Certification Exams: Your Video Coach to Preparing and Passing the Exams, Cathy Winterfield talks about what the HRCI exam experience will be like and how you can embark on your own hero's journey.

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.

Video: HRCI Certification Exam: What Are the First Things I Need to Get Started?: By Cathy Winterfield, Kelley Snyder; Oct 21, 2015; In this video from HRCI Certification Exams: Your Video Coach to Preparing and Passing the Exams, Cathy Winterfield explains what you need to do to get started studying for the HRCI exam, including a crucial first step that many don't think to do.

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.

PHR Exam Prep: Workforce Planning and Employment: By Cathy Winterfield; Oct 7, 2015; Responsibilities relating to workforce planning and employment provide HR professionals with the opportunity to have a lasting impact on the organization. Whether this impact is positive, however, depends in large part on the way in which HR professionals execute these responsibilities. This chapter from PHR Exam Prep: Professional in Human Resources, 3rd Edition covers how an HR professional can successfully execute workforce planning and employment.

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.

Video: CompTIA Network+ N10 006 Complete Video Course: QoS: By Kevin Wallace; Oct 1, 2015; In this excerpt from CompTIA Network+ N10-006 Complete Video Course, Kevin Wallace defines Quality of Service (QoS) and discusses different QoS mechanisms.