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Routing & Switching

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CCNA ICND2 Cert Guide: Variable Length Subnet Masks
Dec 19, 2011
This chapter introduces VLSM, including VLSM Concepts and Configuration, Finding VLSM Overlaps, Adding New Subnets to an Existing VLSM Design, and Designing a Subnetting Plan Using VLSM.
LAN Network Cable Media and Connectors
Dec 19, 2011
This article takes a look at the LAN network cable media that is typically installed in most environments and the different connectors that are often used.
Network Diagram Creation and Interpretation
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.
OSI and TCP/IP Model Layers
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.
The TCP/IP and OSI Networking Models
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.
CCNP: Troubleshooting OSPF
Nov 14, 2011
In this article, Anthony Sequeira discusses basic troubleshooting steps for the complex, link-state routing protocol Open Shortest Path First (OSPF).
CCNA SEC: Router Hardening
Sep 14, 2011
This article discusses various means of making sure your routers are set up with maximum security, including manually hardening the router and router hardening with Cisco SDM.
To Route or Not to Route: A Day in the Life of a Router
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.
What Happens in the VLAN Stays in the VLAN
Aug 31, 2011
This article discusses discover the secrets of the VLAN and why it is a critical tool in today's networks.
Working with Protocol Analyzers and Related Certifications
Aug 30, 2011
Ed Tittel, creator of the Exam Cram series, discusses the current network protocol analyzers that any real expert needs to know. Who exactly counts as an "expert?" Ed also sorts out which of the many available certifications are really useful in identifying true masters of protocol analysis.
Implementing Cisco Unified Communications Manager, Part 2 (CCNP Voice): Examining Remote-Site Redundancy Options
Aug 25, 2011
This chapter provides an overview of the different options with remote-site redundancy in CUCM multisite installations.
CCNP Security VPN Cert Guide: Configuring Policies, Inheritance, and Attributes
Aug 24, 2011
This chapter looks at the methods available for policy assignment in real-life scenarios and reviews how these policy methods work together if more than one is assigned to a user through the inheritance mode.
CCNP: Troubleshooting EIGRP
Aug 3, 2011
In this article, we will examine the art of Troubleshooting EIGRP, a key topic for CCNP certification. This article will begin by reviewing key information we should keep in mind about the protocol or its proper implementation and troubleshooting, and then specific scenarios will be illustrated. The article will also provide specific command guidance and usage.
Spanning Tree Protocol Concepts and Configuration
Jul 13, 2011
This article takes a look at some of the basic STP concepts and reviews the configuration required to deploy STP on a switch.
CCNP Security IPS 642-627 Quick Reference: Installation of a Typical Sensor
Jun 13, 2011
Gary Halleen outlines the installation of a typical Cisco IPS sensor.
Cisco Unified Serviceability
May 25, 2011
A main section of CUCM is Unified Serviceability. Within in this section, you have access two useful web-based tools and resources that can be crucial to a healthy Unified Communications environment: Alarm Configuration and Traces. Both are discussed here.
The Explosion of Cybercrime
May 23, 2011
This article provides an overview of various types of cyber crime, including cyber extorsion, botnets, morophing malware, and online fraud.
CCNP Voice Quick Reference: Centralized Call Processing Redundancy
Apr 15, 2011
This chapter reviews the mechanisms for providing call survivability and device failover in remote sites. This includes the configuration of Cisco IOS routers as Survivable Remote Site Telephony (SRST) gateways with MGCP fallback, and the use of Cisco Unified Communications Manager Express in SRST mode.
CCNP Security Quick Reference: Deploying Cisco ASA AnyConnect Remote-Access VPN Solutions
Apr 14, 2011
In this chapter you learn to deploy and manage Secure Sockets Layer (SSL) virtual private networks (VPN) on Cisco Adaptive Security Appliance (ASA) as the VPN gateway with clients using AnyConnect SSL Client software.
CCNP Voice Quick Reference: VoIP Call Legs
Apr 5, 2011
In this chapter from CCNP Voice CVoice 642-437 Quick Reference, you will learn about how VoIP traffic is created. Topics such as codecs and transport layers are examined in more detail.

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