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Operation of NLIA System |
In case of the client
that uses the Internet domain name system, the user enters URL
on the web browser in search for a site, and the system queries
the name server to acquire the host IP
information of the entered. This series of processes is called "Resolving".
The client part that handles resolving is called "Resolving". The
NLIA system also has the
resolving flow. The NLIA service is provided in two ways depending
on the user environment. If the name server of the ISP
or the corporation supports NLIA, or if client software is installed
on the client PC, the user
can access the desired web site, using NLIA, from anywhere in the
world |
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Resolution of Internet domain name system |
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| Domain Name space |
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The
Internet domain name space has a hierarchical
structure. The top on the domain name space is
called "root", and is expressed as"root". Root
has the TLD
domains, and each TLD domain is identified with
a name (label). A root has up to 127 labels, and
gives up to 63 characters between the labels.
Labels can be |
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| Domain Name Structure |
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The Internet
domain name system has 13 root servers, and the root
server has the registry name server addresses of the
TLD domains such as kr, cn, au, com and net. The name
server of each registry has the name server addresses
of the domains such as sun.com and hp.com. This is called
Tree structure. |
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The
domain name server not only provides the reply for the
domains under its authority, but also searches the domains
which are not under its authority. his process is called
as Resolution". In the actual host connection process,on
receiving request for connection to the host of www.netpia.com,
the resolver makes a query to the name server. The name
server makes the reply in reference to the data under
the authority of the host, or if there is no information,
searches the host address. |
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name sends queries to one of the 13 root servers on
the registry server address, and then, sends query to
the registry name server on information of netpia.com.
The mapping address of www.netpia.com
is in the name server of netpia.com. Receiving the host
address, the name server sends the address to the client
resolver.
[Figure 2-2] shows the flow. |
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NLIA Resolution |
| One of the features of the Internet domain
name system is its level architecture. As explained above, NLIA has
a new layer on the domain name system, and operates relatively simply.
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| NLIA Server-based Resolution
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| In the NLIA system,
for the NLIA entered by the user, the client resolver
sends query to the NLIA name server. The NLIA name server
notifies the client of the NLIA keyword server address,
and the NLIA keyword server notifies the client of the
host address. [Figure 2-3] illustrates this procedure
when the name server supports NLIA. If the client resolver
sends query on NLIA to the NLIA name server sends information
on the NLIA keyword server. The client sends query to
the NLIA keyword server. The NLIA keyword server receives
URL of the Keyword from the NLIA DB server, and sends
the URL to the client. |
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| NLIA Client-based Resolution
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| If the client PC
has the client software that facilitates NLIA use, the
procedure becomes simpler. As illustrated in [Figure 2-4],
the client sends a query to the NLIA resolution server
and receives the host address of NLIA. The NLIA resolution
server searches the NLIA DB server, and sends the host
address to the resolver. If the client sends a query to
the NLIA resolution server on NLIA to the NLIA resolution
server searches the NLIA DB server, and sends |
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