July 26, 2017

Essential Network Concepts Part 2

March 1, 2004 Dan DiNicolo

In this article we’ll walk through the essentials of network transmissions and network cabling. This includes a look at the various cable types commonly found on LANs and their properties, as well as the methods for properly wiring devices and creating Category 5 cables. […]

Essential Network Concepts Part 3

March 1, 2004 Dan DiNicolo

This article carries on with our review of basic network concepts, including a look at network media access methods and an introduction to network technologies. The material to be covered in this article includes: […]

Essential Network Concepts Part 1

February 27, 2004 Dan DiNicolo

Welcome to article number 4 in my Cisco CCNA in 15 minutes a week series. This week’s article begins the move beyond network models and into actual networking concepts. Prior to getting into the details of Cisco devices and their configuration, you’ll need a solid fundamental understanding of not only network concepts, but also technologies, protocols, and equipment. This article will be the first of a few that will begin covering some of these critical areas; this particular article provides an overview of basic network equipment. […]

Neglect and Misunderstanding of Backups

February 23, 2004 A.P. Lawrence

I had a call this week from a client who needed a file restored from backup. I had set them up with DVD-RAM and a Supertar a year ago, and had labeled five cartridges with Mon, Tues, etc. I know that (or thought I knew) they followed this rotation for a while, because I had used the previous day’s backup to restore files for them earlier this year. […]

SME Server Local Networks and VPN’s

February 23, 2004 A.P. Lawrence

The SME Server (formerly E-Smith) normally rejects attempt to send mail outside of its own domain if you are connecting from somewhere other than the local lan. This is correct behaviour; otherwise anyone could use your server as a mail relay and you’d become an inadvertent spammer rather quickly. […]

Performance Optimizing Syslog Server

February 19, 2004 Rainer Gerhards

We are quite often asked how many syslog message per second MonitorWare Agent can receive. The answer is not as simple as it may look. It largely depends. So I finally thought I write this brief article on the factors that influence syslog server performance. Obviously, you can also use it as a rough guide to optimizing your setup. […]

Xinetd

February 19, 2004 A.P. Lawrence

Xinetd is a replacement for inetd, which was the original Unix super-daemon used to start network services on demand. The reason for inetd goes back to days of low memory and poor memory management: you didn’t want to keep a service running in memory if it was infrequently used. One process (inetd) would listen for connections on appropriate ports, and fire off the appropriate service when a request came in. […]

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