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Nikkei Network

October 2005 Issue

SOUPED-UP FEATURE Techniques that Have an Immediate Effect You can learn how to block spam through practical exercises - Many e-mail users are annoyed by spam or unsolicited junk e-mail.  You are deluged with massive doses of nuisance e-mail every day that contain ads for products in which you are not interested or try to lead you to adult-only websites.  You would just want to ignore such e-mail altogether, but you might feel an urge to check the content in order not to overlook important e-mail buried in the mess of seemingly unwanted e-mail, on the other hand.  How should received e-mail be treated?  This article offers techniques for blocking spam. Introduction - Manual filtering of received e-mail has already reached its limit - Time and labor can be saved by adopting three anti-spam measures Measure No. 1: Filtering - Use a “junk e-mail” filtering function offered by mailer software or an anti-spam tool to trash unsolicited commercial e-mail without reading it Measure No. 2: E-mail header analysis - Analyze hidden information within the e-mail header in order to identify whether the e-mail that you have received is legitimate Measure No. 3: Preventing your e-mail addresses from being harvested - Use disposable addresses when you are communicating with unknown Internet users or services Experimentation - Check out the learning potential offered by POPFile Beginner’s Question - Can LAN cables be disposed of as regular burnable trash?

HIGHER-LEVEL FEATURE

A Study of 1,400 Cases Offers Methods for Solving Problems with Networks

- If there is a problem with a network, everybody wants to identify its cause and solve it as soon as possible.  Therefore, Nikkei Network conducted a large-scale questionnaire survey about problems with networks and formulated an “immediate solution chart,” which is useful for solving a variety of different problems. 
In addition, based on the results of this survey, this article selected eight cases considered to be good references and explained them in detail.


Part 1: Analysis
- There is a chart available that allows users to identify the cause or causes of a problem by examining its symptoms.  A majority of the problems can be solved with this chart. 

Part 2: Case Study
- There are various kinds of symptoms and various levels of difficulty in identifying the cause or causes of a problem

Four Problematic Cases Involving the Internet
1. A problem with e-mail
2. A problem with a LAN network
3. A problem with an IP phone
4. A problem that was discovered thanks to an alert sent by a server

Experiment
- What will happen when a cable is connected in a loop?

Network Investigation

Is WiMAX Really an Awesome Technology?
- It is closer to a cell phone than Wireless LAN.  Its actual speed is approximately 15Mbps for transmission within a 10Mh area.