Browse Definitions :
Definition

iterative DNS query

An iterative DNS query is a request for a website name or uniform resource locator (URL) that the domain name system (DNS)  server responds to with the IP address from its zone file cache, if possible. If the server doesn’t have the IP address requested, it forwards the request on to another DNS server. Iterative DNS queries are also known as non-recursive DNS queries.

Iterative requests are used to return information from servers that can’t sustain the workload of performing start-to-finish query responses all the time. This could be a DNS  server for a domain that is prioritizing traffic to its sites or to a root hints or authoritative server that must maintain availability.

The DNS server responds to iterative queries that it has no local information for through referral. The referral points to a DNS server that is authoritative on a domain namespace and those for lower and lower levels of a domain space. The referrals continue until a DNS server is found that is authoritative to the queried site or until an error is returned or a time out is reached.

Iterative requests are made by both iterative DNS servers and recursive DNS servers. Even the requests made by recursive servers to other DNS servers are iterative. At the level of root DNS, all servers are iterative because they are the end of the line and their availability is crucial to the function of the internet.

This was last updated in November 2016

Continue Reading About iterative DNS query

SearchNetworking
  • cloud-native network function (CNF)

    A cloud-native network function (CNF) is a service that performs network duties in software, as opposed to purpose-built hardware.

  • Wi-Fi 6E

    Wi-Fi 6E is one variant of the 802.11ax standard.

  • microsegmentation

    Microsegmentation is a security technique that splits a network into definable zones and uses policies to dictate how data and ...

SearchSecurity
  • MICR (magnetic ink character recognition)

    MICR (magnetic ink character recognition) is a technology invented in the 1950s that's used to verify the legitimacy or ...

  • What is cybersecurity?

    Cybersecurity is the protection of internet-connected systems such as hardware, software and data from cyberthreats.

  • Android System WebView

    Android System WebView is a system component for the Android operating system (OS) that allows Android apps to display web ...

SearchCIO
  • privacy compliance

    Privacy compliance is a company's accordance with established personal information protection guidelines, specifications or ...

  • contingent workforce

    A contingent workforce is a labor pool whose members are hired by an organization on an on-demand basis.

  • product development (new product development -- NPD)

    Product development, also called new product management, is a series of steps that includes the conceptualization, design, ...

SearchHRSoftware
  • talent acquisition

    Talent acquisition is the strategic process employers use to analyze their long-term talent needs in the context of business ...

  • employee retention

    Employee retention is the organizational goal of keeping productive and talented workers and reducing turnover by fostering a ...

  • hybrid work model

    A hybrid work model is a workforce structure that includes employees who work remotely and those who work on site, in a company's...

SearchCustomerExperience
  • Salesforce Trailhead

    Salesforce Trailhead is a series of online tutorials that coach beginner and intermediate developers who need to learn how to ...

  • Salesforce

    Salesforce, Inc. is a cloud computing and social enterprise software-as-a-service (SaaS) provider based in San Francisco.

  • data clean room

    A data clean room is a technology service that helps content platforms keep first person user data private when interacting with ...

Close