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Nikkei Network

February 2006 Issue

SOUPED-UP FEATURE Knowing the Differences in Line Configurations, Authentication Methods, and Security Measures Examination of the mechanism of public wireless LAN - A public wireless LAN service enables users who have a wireless-LAN-compatible PC to access the Internet from cafes, hotels, or other public spaces.  At first glance, there seems to be no difference between this service and one that provides access to the Internet at home.  However, there are unique innovations that support public wireless LAN service.  This article explains its mechanism and offers helpful tips for putting it to the best use possible. Prologue: Grasping the service in its entirety, from the perspectives of connection procedure and infrastructure Part 1 – Mechanism: Innovative techniques used in the services vary from one provider to another, and non-standard technologies are actively used Part 2 – How to Use the Service: Since the risk of using a public wireless LAN service is higher than that of using a wireless LAN at home, it is necessary to check the configuration of your PC Experiment: How are access points that are shared by multiple providers displayed on computer screens?

BEGINNERS’ QUESTION

- What’s the difference between “050” IP phones and “03” IP phones?

HIGHER-LEVEL FEATURE

How to Use Virtual LANs (VLANs)
From broadcast domain to authentication of VLANs

- VLANs have become indispensable for current networks.  They are one of the basic functions of LAN switches. 
This article reviews the basics of LANs in order to deepen understanding of them, explains the mechanism and roles of VLANs, and studies representative cases in which they are used effectively.


Part 1 – Entire Picture: A VLAN enables users to change the scope of a LAN with complete command; It is important to understand the relation between VLAN and IP

Part 2 – Mechanism & Roles: LAN switches play a central role; All you need to understand is two VLAN modes: Port-based VLAN mode and Tag-based VLAN mode

Part 3 – It is important to learn the effects of the introduction of VLANs, ranging from IP phones to telecommunication services

Experiment: What will happen if configurations of port-based VLAN mode and tag-based VLAN mode are mixed up?

PRODUCT LABORATORY

KVM Switches

- The switches allow one user to control two or more computers by switching one computer to another

- When KVM switches became compatible with IP packets, they evolved into a tool for the remote management of servers