Dynamic Domain Name Service

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?For those of you that are new to DNS, we will offer this brief introduction before getting into how it works on Windows 2000. TCP/IP has become the de facto standard network protocol, largely due to the birth and growth of the internet, however, Unix machines have been using TCP/IP and DNS for years. TCP/IP is based on numbers and humans tend to have difficulty remembering them. In an effort to solve this problem, name resolution was invented using HOSTS files which were nothing more than an ASCII text file that listed object names and IP addresses and provided mapping between them. Every network resource had to have an updated HOSTS file that needed to be updated anytime a change, addition or deletion was made to the name resolution table.
As networks soon grew larger, this became an unmanageable task. Imagine having to modify HOSTS files on 10,000 computers when a change was made. This problem was soon solved with the creation of the Domain Name Service (DNS). DNS solves this problem by creating a centralized database of host name to IP address mappings

What is DNA?

? DNS? is a service that? maps a local name to an IP address and conversely an address to a name.

??????????? DDNS provides client machines with a static DNS name even if their IP address is dynamically assigned. Dynamic DNS circumvents the need for static IP addresses.
2.1.DNS STRUCTURE?DNS works by dividing the internetwork into a set of domains or networks that can be further subdivided into subdomains

2.2.DNS IN INTERNET? In internet the domain name space is divided into three different sections.???????????????????????????????????

Who should use DDNS?

If you or your company uses a dynamic IP Address, which you need to connect to remotely, DDNS is PERFECT for you. You've probably had to call in to someone at your home office to find out what the new IP Address, then change your network configurations. With DDNS, you only have to remember a simple hostname.
DDNS generally used in client server model. When the load on a single server gets to be too high, it is better to distribute it to a group of servers using DDNS.

?The various components of such a system are
(i) DDNS
(ii) Dispatcher RMI object (resides in the DDNS)
(iii) Load Handler RMI object (resides at each of the servers)
The following happens, when a client wants to send a request to a server
1. The client sends a DNS request to the DDNS
2. DDNS communicates with the available servers
3. The IP address of the least loaded server is sent to the client
4. The client sends request to that server

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