July 26, 2017

The Cisco Three-Layered Hierarchical Model

May 24, 2004 SemSim.com

Cisco has defined a hierarchical model known as the hierarchical internetworking model. This model simplifies the task of building a reliable, scalable, and less expensive hierarchical internetwork because rather than focusing on packet construction, it focuses on the three functional areas, or layers, of your network: […]

Cabling Cisco Devices

May 24, 2004 SemSim.com

Unshielded Twisted Pair (UTP) is a cable that has four pairs of wires twisted inside it to eliminate electrical interference. UTP cables are connected using RJ-45 connectors that have eight connector pins. The data equipment that is used for internetworking is classified as Data Terminal Equipment (DTE e.g. router interfaces) and Data Communication Equipment (DCE e.g. A WAN connects DTEs through DCE network). […]

Selecting Cisco Products

May 24, 2004 SemSim.com

You must understand the business requirements of the network before buying a product. Based on the requirements, you can select the appropriate Cisco products. […]

The ISAPI Execution Environment

May 10, 2004 Rainer Gerhards

This document bases on information and testing done with IIS 1.0. We have not re-tried it with later versions. However, we feel very comfortable with the information contained herein and think that it still is correct. […]

Installing MRTG on a Windows Platform

May 7, 2004 Beau Monday

MRTG is the most popular open source performance measuring tool being used around the world today. While MRTG is open source, it has been widely adopted by major companies everywhere who use it to measure network performance and adherence to SLAs, among other things. For an interesting snapshot of who is using MRTG, and for what purpose, go to MRTG’s “Where, What, How” page and have a look at some of the interesting things MRTG is being used to track. Although MRTG started out as an application to measure network performance on routers (MRTG stands for “Multi Router Traffic Grapher”), it is being used today to graph everything from traffic jams in the Netherlands to the local temperature in Wroclaw. If you can provide a numeric value to MRTG, it can produce a graph of it. […]

Layer 2 Switching and Bridging

May 4, 2004 Dan DiNicolo

Any look at network switching concepts will ultimately lead to a discussion about network bridging, and vice versa. At the end of the day, the roles played by a bridge and a switch are more or less identical – they help to break a network up into a number of smaller collision domains. Recall from earlier in the series that a collision domain is simply a group of computers amongst which data collisions can occur. For example, when connecting systems using a hub, all systems are considered to be part of the same collision domain, since the hub will simply forward data out all ports, with no regard for where the actual destination host is located. […]

Recovering System After Upgrade

March 17, 2004 A.P. Lawrence

Usually upgrades are binary: either they work or they don’t. Actually, my experience with SME upgrades has been very good: I’ve only had a very few where the upgrade process didn’t work at all. In those cases, you install new, apply all applicable blades, and then restore from backup. That’s annoying, but fairly simple. […]

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