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Q: Multiple choice questions and answers on DNS?
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What is Use of inverse domain?

Inverse domain is used to map an address to a name. For instance, if a server receives a request from a client and this server has only the ip addresses of the clients in its list then the server needs to find out if this client is on its authorized client list. In order to determine if the client is on the authorized client list,server asks its resolver to query to the DNS server to map an address to name. And this type of querys are called inverse query(pointer query -PTR).


What is meant by domain?

Domains is a group of computers and other resources that are part of a network and share a common directory database .Once a server has been installed , you can use the Active Directory Wizard to install Active Directory in order to install Active directory on the first server on the network , that server must have the access to a server running DNS (Domain Name Service). If you don't have install this service on your server then you will have to install this service during the Active Directory installationThe 'domain' is simply your computer address not to confused with an URL. A domain address might look something like 211.170.469.A Domain is simply a name with which we use to refer a computer.It mean online property!The domain is the "end part" of the Uniform Resource Locator (URL) of an Internet address. It identifies a subdivision of the net so that the location of an individual, group or organization can be pinpointed.Domains include: .com, .net, .gov, .edu, .mil, .uk, .fr and a whole bunch more.Other meaningsDomain has more than one meaning. It can mean a place under one rule or one control, or it can mean a sphere of influence or control. In mathematics, it means the set of possible values of an independent variable. In physics, it means a discreet region of magnetism in ferromagnetic material. Finally, if you add an e at the end to make the word Domaine, then it means a vineyard.


What is main purpose of nspr4 dll file?

NetScape Portable Runtime (NSPR) provides platform independence for non-GUI operating system facilities. These facilities include threads, thread synchronization, normal file and network I/O, interval timing and calendar time, basic memory management (malloc and free) and shared library linking. A good portion of the library's purpose, and perhaps the primary purpose in the Gromit environment, is to provide the underpinnings of the Java VM, more or less mapping the sys layer that Sun defines for the porting of the Java VM to various platforms. NSPR does go beyond that requirement in some areas and since it is also the platform independent layer for most of the servers produced by Netscape. It is expected and preferred that existing code be restructured and perhaps even rewritten in order to use the NSPR API. It is not a goal to provide a platform for the porting into Netscape of externally developed code. [hide]* 1 History * 2 How It Works ** 2.1 Threads ** 2.2 Thread synchronization ** 2.3 I/O ** 2.4 Network addresses ** 2.5 Time ** 2.6 Memory management ** 2.7 Linking * 3 Where It's Headed * 4 Original Document Information The current generation of NSPR is known as NSPR20. The first generation of NSPR was originally conceived just to satisfy the requirements of porting Java to various host environments. NSPR20, an effort started in 1996, builds on that original idea, though very little is left of the original code. (The "20" in "NSPR20" does not mean "version 2.0" but rather "second generation".) Many of the concepts have been reformed, expanded, and matured. Today NSPR may still be appropriate as the platform dependent layer under Java, but its primary application is supporting clients written entirely in C or C++. NSPR's goal is to provide uniform service over a wide range of operating system environments. It strives to not export the lowest common denominator, but to exploit the best features of each operating system on which it runs, and still provide a uniform service across a wide range of host offerings. Threads are the major feature of NSPR. The industry's offering of threads is quite sundry. NSPR, while far from perfect, does provide a single API to which clients may program and expect reasonably consistent behavior. The operating systems provide everything from no concept of threading at all up to and including sophisticated, scalable and efficient implementations. NSPR makes as much use of what the systems offer as it can. It is a goal of NSPR that NSPR impose as little overhead as possible in accessing those appropriate system features. Thread synchronization is loosely based on Monitors as described by C.A.R. Hoare in Monitors: An operating system structuring concept, Communications of the ACM, 17(10), October 1974 and then formalized by Xerox' Mesa programming language ("Mesa Language Manual", J.G. Mitchell et al, Xerox PARC, CSL-79-3 (Apr 1979)). This mechanism provides the basic mutual exclusion (mutex) and thread notification facilities (condition variables) implemented by NSPR. Additionally, NSPR provides synchronization methods more suited for use by Java. The Java-like facilities include monitor reentrancy, implicit and tightly bound notification capabilities with the ability to associate the synchronization objects dynamically. NSPR's I/O is a slightly augmented BSD sockets model that allows arbitrary layering. It was originally intended to export synchronous I/O methods only, relying on threads to provide the concurrency needed for complex applications. That method of operation is preferred though it is possible to configure the network I/O channels as non-blocking in the traditional sense. Part of NSPR deals with manipulation of network addresses. NSPR defines a network address object that is Internet Protocol (IP) centric. While the object is not declared as opaque, the API provides methods that allow and encourage clients to treat the addresses as polymorphic items. The goal in this area is to provide a migration path between IPv4 and IPv6. To that end it is possible to perform translations of ASCII strings (DNS names) into NSPR's network address structures, with no regard to whether the addressing technology is IPv4 or IPv6. Timing facilities are available in two forms: interval timing and calendar functions. Interval timers are based on a free running, 32-bit, platform dependent resolution timer. Such timers are normally used to specify timeouts on I/O, waiting on condition variables and other rudimentary thread scheduling. Since these timers have finite namespace and are free running, they can wrap at any time. NSPR does not provide an epoch, but expects clients to deal with that issue. The granularity of the timers is guaranteed to be between 10 microseconds and 1 millisecond. This allows a minimal timer period in of approximately 12 hours. But in order to deal with the wrap-around issue, only half that namespace may be utilized. Therefore, the minimal usable interval available from the timers is slightly less than six hours. Calendar times are 64-bit signed numbers with units of microseconds. The epoch for calendar times is midnight, January 1, 1970, Greenwich Mean Time. Negative times extend to times before 1970, and positive numbers forward. Use of 64 bits allows a representation of times approximately in the range of -30000 to the year 30000. There is a structural representation (i.e., exploded view), routines to acquire the current time from the host system, and convert them to and from the 64-bit and structural representation. Additionally there are routines to convert to and from most well-known forms of ASCII into the 64-bit NSPR representation. NSPR provides API to perform the basic malloc, calloc, realloc and free functions. Depending on the platform, the functions may be implemented almost entirely in the NSPR runtime or simply shims that call immediately into the host operating system's offerings. Support for linking (shared library loading and unloading) is part of NSPR's feature set. In most cases this is simply a smoothing over of the facilities offered by the various platform providers. NPSR is applicable as a platform on which to write threaded applications that need to be ported to multiple platforms. The current implementation supports Macintosh (PPC), WIN-32 (WinNT, Win9x) and 20 versions of UNIX and is still expanding. The basic API is stable and expected to remain that way. NSPR is functionally complete and has entered a mode of sustaining engineering. As operating system vendors issue new releases of their operating systems, NSPR will be moved forward to these new releases by interested players.


Related questions

Where can one find information on dns made easy?

DNS Made Easy is a solution for business to setup a DNS and own multiple domains. DNS Made Easy information is best obtained through their website that has plan information.


What is the difference between an open DNS and a closed DNS?

There is one major difference between an open DNS and a closed DNS. Open DNSs allow multiple users to connect easily while closed ones do not allow more users.


What is the point of using a dns service provider?

In this case they host the DNS rather than just registering your domain name. Look for on with multiple locations for the best service.


What is a DNS Revolver used for?

The client side of a Domain Name System (DNS) is called a DNS Resolver. It is responsible for initiating the queries that lead to the full resolution of the translation of a domain name into an IP address. A small amount of DNS Resolvers only communicate to one single server instead of multiple servers.


Who is the one person that controls the World's DNS?

Because there are multiple root level servers no one person or organization controls the DNS for the world. It is also a distributed system so this would not be possible.


Where can one find information DNS load balancing?

DNS load balancing is defined to be spreading the load of people on a certain website accross multiple survers if one does not suffice. One can find more information about DNS load balancing on sites like Zytrax and Splux.


Where would one find details on what is DNS?

HTG (how to geek), is possibly the top site for technical related questions and how-to guides. Regarding this question specifically, they have a fairly in-depth article explaining what exactly DNS is.


What is dynamic DNS integrated DNS?

The dynamic DNS integrated DNS refers to the method of automatically updating a name server in the DNS in real time.


What is the difference between a zone and a domain?

A domain is a portion of the overall DNS namespace. A zone, however, can contain multiple contiguous domains.


What is difference Between Primary and Secondary DNS?

Secondary DNS gets its records from the Primary DNS Server. The secondary DNS is essentially there in case the primary DNS doesn't respond.


Does DHCP or DNS lead to network connectivity problems?

It can if the administrator of the DHCP server has input incorrect values. DHCP is to provide a device with answers to commonly asked questions that it will need to correctly function in a network. If you can't get a DHCP address and everybody else can the problem is on your end most likely.


What is DNS root hints?

A DNS root zone is the top-level DNS zone in a Domain Name System (DNS) hierarchy