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2012 optical industry trends

February 12, 2012

If the 2011 calendar year could be described in three words, they would be “explosive bandwidth growth.” Both wired and wireless networks were stretched as consumers continued to adopt network intensive technologies at a fast pace.

The rapid growth of the network

December 31, 2011

The practice of using a name as a simpler, more memorable abstraction of a host's numerical address on a network dates back to the ARPANET era. Before the DNS was invented in 1982, each computer on the network retrieved a file called HOSTS.TXT from a computer at SRI (now SRI International).The HOSTS.TXT file mapped names to numerical addresses. A hosts file still exists on most modern operating systems by default and generally contains a mapping of the IP address 127.0.0.1 to "localhost". Many operating systems use name resolution logic that allows the administrator to configure selection priorities for available name resolution methods.

Domain name space

December 31, 2011

The domain name space consists of a tree of domain names. Each node or leaf in the tree has zero or more resource records, which hold information associated with the domain name. The tree sub-divides into zones beginning at the root zone.

Authoritative name server

December 31, 2011

An authoritative name server is a name server that gives answers that have been configured by an original source, for example, the domain administrator or by dynamic DNS methods, in contrast to answers that were obtained via a regular DNS query to another name server. An authoritative-only name server only returns answers to queries about domain names that have been specifically configured by the administrator.

Recursive and caching name serverIn principle

December 31, 2011

Recursive and caching name serverIn principle, authoritative name servers are sufficient for the operation of the Internet. However, with only authoritative name servers operating, every DNS query must start with recursive queries at the root zone of the Domain Name System and each user system must implement resolver software capable of recursive operation.

The client-side of the DNS

December 31, 2011

The client-side of the DNS is called a DNS resolver. It is responsible for initiating and sequencing the queries that ultimately lead to a full resolution (translation) of the resource sought, e.g., translation of a domain name into an IP address.

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