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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.
Implementing Cisco IP Switched Networks (SWITCH) Foundation Learning Guide: Fundamentals Review
By Richard Froom, Erum Frahim
May 27, 2015
This chapter from Implementing Cisco IP Switched Networks (SWITCH) Foundation Learning Guide: (CCNP SWITCH 300-115) covers the following basic switching topics as a review to CCNA: hubs and switches, bridges and switches, switches of today, broadcast domains, MAC addresses, the basic Ethernet frame format, basic switching function, VLANs, the Spanning Tree Protocol, trunking, port channels, and multilayer switching (MLS).
Basic Data Transmission in Networks: MAC Tables and ARP Tables
By Sean Wilkins
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.
Collision Domains and Broadcast Domains = Apples and Oranges
By Sean Wilkins
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of the ideas, and networking specialists who are new to the field need to distinguish between current terminology and outdated concepts.
OSPF Implementation
By Diane Teare, Rick Graziani, Bob Vachon
Feb 3, 2015
This chapter from Implementing Cisco IP Routing (ROUTE) Foundation Learning Guide: (CCNP ROUTE 300-101) examines the Open Shortest Path First (OSPF) Protocol, one of the most commonly used interior gateway protocols in IP networking.
CCNP Routing and Switching Portable Command Guide: Configuration of Redistribution
By Scott Empson, Patrick Gargano, Hans Roth
Jan 21, 2015
This chapter from CCNP Routing and Switching Portable Command Guide provides information about redistribution topics.
Troubleshooting Methods for Cisco IP Networks
By Amir Ranjbar
Jan 14, 2015
This chapter from Troubleshooting and Maintaining Cisco IP Networks (TSHOOT) Foundation Learning Guide: (CCNP TSHOOT 300-135) defines troubleshooting and troubleshooting principles. Next, six different troubleshooting approaches are described. The third section of this chapter presents a troubleshooting example based on each of the six troubleshooting approaches.
CCNP Routing and Switching SWITCH 300-115 Official Cert Guide: Switch Port Configuration
By Frankena
Dec 18, 2014
This chapter from CCNP Routing and Switching SWITCH 300-115 Official Cert Guide presents the various Ethernet network technologies used to establish switched connections within the campus network and also details the switch commands required for configuring and troubleshooting Ethernet LAN ports.
CCIE Routing and Switching v5.0 Official Cert Guide: Classification and Marking
By Narbik Kocharians, Terry Vinson
Dec 16, 2014
This chapter from CCIE Routing and Switching v5.0 Official Cert Guide, Volume 2, 5th Edition covers the following subtopics from the Cisco CCIE Routing and Switching written exam blueprint: Modular QoS CLI (MQC), Network-Based Application Recognition (NBAR), QoS Classification, QoS Marking, and Cisco AutoQoS.
CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide: Troubleshooting Device Performance
By Raymond Lacoste, Kevin Wallace
Dec 9, 2014
This chapter from CCNP Routing and Switching TSHOOT 300-135 Official Cert Guide discusses common reasons for high CPU and memory utilization on routers and switches, in addition to how we can recognize them. This chapter also covers interface statistics because they sometimes provide the initial indication of some type of issue.
Fundamental EIGRP Concepts
By Kevin Wallace
Nov 26, 2014
This chapter from CCNP Routing and Switching ROUTE 300-101 Official Cert Guide covers EIGRP fundamentals, EIGRP neighborships, and neighborships over WANs.
Exam Profile: CCIE Collaboration Lab v1.0
By Kevin Wallace
Nov 5, 2014
The CCIE Collaboration Lab exam went live in February 2014, and it is the evolution of the challenging CCIE Voice Lab exam. This exam profile provides you with an overview of the lab exam format, identifies trouble spots on the lab, and offers preparation hints. Finally, you are given a list of recommended study resources and a plan for what to do next.
Exam Profile: CCIE Collaboration v1.0 Written (400-051)
By Kevin Wallace
Nov 5, 2014
The CCIE Collaboration Written exam is the prerequisite exam to qualify for the CCIE Collaboration Lab exam. This exam profile provides you with an overview of the CCIE Collaboration Written exam format, identifies trouble spots on the exam, and offers preparation hints. Finally, you are given a list of recommended study resources and a plan for what to do next.
Exam Profile: CCNP Routing and Switching SWITCH (300-115)
By Frankena
Oct 14, 2014
The CCNP SWITCH exam is one component of the Cisco CCNP Routing and Switching certification. This exam profile provides you with an overview of the SWITCH exam format, identifies trouble spots on the exam, and offers preparation hints. Finally, you are given a list of recommended study resources and a plan for what to do next.
Exam Profile: Cisco CCNP Routing and Switching ROUTE (300-101)
By Kevin Wallace
Oct 3, 2014
The ROUTE exam (exam number 300-101) is one of three exams in the updated CCNP Routing and Switching track, announced by Cisco in July 2013. Specifically, this exam profile gives you an overview of the exam structure, major topic areas found on the exam, and hints to help you better prepare for the exam. Then, you are presented with a collection of recommended study resources, and suggestions on which exam to take next in your Cisco certification pursuits.
Exam Profile: CCIE Routing and Switching v5.0 Lab Exam
By Scott Morris
Oct 2, 2014
This article describes the new CCIE Routing and Switching v5.0 Lab Exam, including the objectives, preparation hints, and study resources.
CCIE Security v4.0 Quick Reference: Application and Infrastructure Security
By Lancy Lobo, Umesh Lakshman
Sep 17, 2014
This chapter from CCIE Security v4.0 Quick Reference, 3rd Edition covers HTTP, HTTPS, Simple Mail Transfer, Protocol, File Transfer Protocol, Domain Name System, and Trivial File Transfer Protocol.
CCIE Routing and Switching v5.0 Official Cert Guide: IP Forwarding (Routing)
By Narbik Kocharians, Peter Paluch
Sep 10, 2014
This chapter from CCIE Routing and Switching v5.0 Official Cert Guide, Volume 1, 5th Edition covers Cisco Express Forwarding concepts, routing protocol migration, and policy-based routing.
Selecting a Routing Protocol: CCNP Routing and Switching ROUTE 300-101
By Kevin Wallace
Sep 4, 2014
This lesson, excerpted from CCNP Routing and Switching ROUTE 300-101 Complete Video Course, identifies a variety of characteristics to consider when selecting a routing protocol. Also, common routing protocols (specifically, RIP, OSPF, EIGRP, and BGP) are categorized as a distance-vector, link-state, or path-vector routing protocol.
GRE Tunnel Theory and Configuration: CCNP Routing and Switching ROUTE 300-101
By Kevin Wallace
Aug 28, 2014
This lesson, excerpted from CCNP Routing and Switching ROUTE 300-101 Complete Video Course, discusses the theory behind a Generic Routing Encapsulation (GRE) tunnel and describes how a GRE tunnel can be combined with an IPsec tunnel to add security. it concludes by configuring and verifying a GRE tunnel.

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