What Is DNS and Managed DNS? Questions and Answers

What is a DNS server and how does it work?

The Domain Name System (aka DNS) is used to resolve human-readable hostnames like into machine-readable IP addresses like 555.55.555.555. DNS also provides other information about domain names, such as mail services.

What is managed DNS?

The services will provide different levels of service but typically they'll give you a control panel to manage your DNS records. One primary benefit of such a service is the ability to distribute the name servers geographically to protect against outages. Nameserver and DNS server are generally the same thing.

What is the primary name server?

DNS records need to be maintained by people. Name servers are queried by various programs and other name servers to convert domain names into IP addresses all day long. Each name server, called a primary name server, usually has a back-up server, called a secondary name server, so that this can be done uninterrupted.

What is a domain name server and what does it do?

DNS is an acronym for Domain Name Server, and is the system used to translate word-based addresses of systems (such as WWW.VuLosAngeles.COM) to the numerical IP (Internet Protocol) address of the computer or system that should be located at that address.

How do domain names work?

Computers and other network devices on the Internet use an IP address to route your request to the site you're trying to reach. ... Therefor, you just connect through a domain name server, also called a DNS server or name server, which manages a massive database that maps domain names to IP addresses.

What is the domain name system?

It is short for Domain Name System (or Service or Server), an Internet service that translates domain names into IP addresses. Because domain names are alphabetic, they're easier to remember. The Internet however, is really based on IP addresses. ... Therefor, the DNS system is, in fact, its own network.

What is a recursive DNS server?

Recursion is a name-resolution technique in which a DNS server queries other DNS servers on behalf of the requesting client to fully resolve the name and then sends an answer back to the client. Attackers can use recursion to deny the DNS Server service.

What is a zone in DNS server?

A DNS zone is any distinct, contiguous portion of the domain name space in the Domain Name System (DNS) for which administrative responsibility has been delegated to a single manager. The domain name space of the Internet is organized into a hierarchical layout of subdomains below the DNS root domain.

What is an authoritative server?

An authoritative name server provides actual answer to your DNS queries such as – mail server IP address or web site IP address (A resource record). It provides original and definitive answers to DNS queries. ... It is said, a hostmaster only makes changes to master server zone records.

What is the use of name server?

Nameserver is a server on the internet specialized in handling queries regarding the location of a domain name's various services. Nameservers are a fundamental part of the Domain Name System (DNS). They allow using domains instead of IP addresses.

What is a recursive queries?

A recursive query is a kind of query, in which the DNS server, who received your query will do all the job of fetching the answer, and giving it back to you. During this process, the DNS server might also query other DNS server's in the internet on your behalf, for the answer.

What is iterative query and recursive query?

Recursive DNS queries occur when a DNS client requests information from a DNS server that is set to query subsequent DNS servers until a definitive answer is returned to the client. The queries made to subsequent DNS servers from the first DNS server are iterative queries.

What is a DNS queries?

A DNS query is the process of a computer or networking device making an inquiry to get an IP address for a DNS name such as The client computer will send a DNS query to one of their internet service provider's DNS servers.

What is a name server in DNS?

Domain Name Servers (DNS) are the Internet's equivalent of a phone book. They maintain a directory of domain names and translate them to Internet Protocol (IP) addresses. This is necessary because, although domain names are easy for people to remember, computers or machines, access websites based on IP addresses.

What is a naming service?

A name server is a computer Hardware or software server that implements a network service for providing responses to queries against a directory service. It translates an often humanly-meaningful, text-based identifier to a system-internal, often numeric identification or addressing component.

How does a name server work?

The Domain Name System (DNS) is the system that converts domain names ( into IP addresses ( ... 1) When you go to your registrar, you'll purchase a domain. When you purchase the domain, you'll specify the nameservers you want that domain to use.

What is a hierarchical query?

A hierarchical query is a type of SQL query that handles hierarchical model data. They are special case of more general recursive fixpoint queries, which compute transitive closures. In standard SQL:1999 hierarchical queries are implemented by way of recursive common table expressions (CTEs).

What is a CTE?

A common table expression (CTE) can be thought of as a temporary result set that is defined within the execution scope of a single SELECT, INSERT, UPDATE, DELETE, or CREATE VIEW statement. A CTE is similar to a derived table in that it is not stored as an object and lasts only for the duration of the query.

What is iterative query?

An iterative name query is one in which a DNS client allows the DNS server to return the best answer it can give based on its cache or zone data.

What is iterative query in DNS?

Recursive DNS queries occur when a DNS client requests information from a DNS server that is set to query subsequent DNS servers until a definitive answer is returned to the client. The queries made to subsequent DNS servers from the first DNS server are iterative queries.

What is a NS record?

An NS record is used to delegate a subdomain to a set of name servers. Whenever you delegate a domain to DNSimple the TLD authorities place NS records for your domain in the TLD name servers pointing to us.

What is the primary name server?

DNS records need to be maintained by people. Name servers are queried by various programs and other name servers to convert domain names into IP addresses all day long. Each name server, called a primary name server, usually has a back-up server, called a secondary name server, so that this can be done uninterrupted.

What is the use of JNDI in Websphere application server?

JNDI resource lookups in WebSphere Application Server. The Java Naming and Directory Interface (JNDI) is mainly used for accessing resources that are managed by a container. JEE application servers expose JDBC data sources, JMS connection factories, JTA user transactions among others to applications via JNDI.

What is meant by inline query?

An inline view is a SELECT statement in the FROM-clause of another SELECT statement. In-line views are commonly used to simplify complex queries by removing join operations and condensing several separate queries into a single query.

What is Union all in SQL?

The SQL UNION ALL operator is used to combine the result sets of 2 or more SELECT statements. It does not remove duplicate rows between the various SELECT statements (all rows are returned). Each SELECT statement within the UNION ALL must have the same number of fields in the result sets with similar data types.

What is a derived table?

A "derived table" is essentially a statement-local temporary table created by means of a subquery in the FROM clause of a SQL SELECT statement. It exists only in memory and behaves like a standard view or table.

What is DNS amplification?

A Domain Name Server (DNS) amplification attack is a popular form of distributed denial of service (DDoS) that relies on the use of publically accessible open DNS servers to overwhelm a victim system with DNS response traffic.

What is a forwarder in DNS?

A forwarder is a Domain Name System (DNS) server on a network that is used to forward DNS queries for external DNS names to DNS servers outside that network. You can also configure your server to forward queries according to specific domain names using conditional forwarders.

What is a resource record?

Resource records are the data elements that define the structure and content of the domain name space. All DNS operations are ultimately formulated in terms of resource records. Resource Records (RRs) are the DNS data records. Their precise format is defined in RFC 1035 §3.2.1.

List Of RFC's

What protocol does DNS use?

DNS queries consist of a single UDP request from the client followed by a single UDP reply from the server. The Transmission Control Protocol (TCP) is used when the response data size exceeds 512 bytes, or for tasks such as zone transfers. Some resolver implementations use TCP for all queries.

What is a glue record in DNS?

A glue record is the IP address of a name server held at the. Domain Name registry. Glue records are required when you wish to set the name servers of a domain name to a hostname under the domain name itself.

What is a root of a domain?

A root domain (home page) is the parent domain to a sub domain, and its name is not, and can not be divided by a dot. While creating any domain at a website of domain provider, the provider system will always propose you to choose a domain name without a dot in a name.

What is the use of context in Java?

A Context represents your environment. It represents the state surrounding where you are in your system. For example, in web programming in Java, you have a Request, and a Response. These are passed to the service method of a Servlet. A property of the Servlet is the ServletConfig, and within that is a ServletContext.

What is a TLD server?

Internet Corporation for Assigned Names and Numbers (ICANN) looks after most top-level domain. It operates the Internet Assigned Numbers Authority (IANA) and is responsible for maintaining the DNS root zone. DNS server which keeps all root zone is called TLD name server.

What is an example of a DNS?

A domain, such as , is registered and IP addresses need to be assigned to hostnames under it. An IP address block requires reverse DNS entries ( IP to hostname). A backup or second name server, called a slave, will reply to queries.

What is an inline view?

SQL > Advanced SQL > Inline View. An inline view is a SELECT statement in the FROM clause. As mentioned in the View section, a view is a virtual table that has the characteristics of a table yet does not hold any actual data.

What is a materialized view and when would it be used?

In computing, a materialized view is a database object that contains the results of a query. For example, it may be a local copy of data located remotely, or may be a subset of the rows and/or columns of a table or join result, or may be a summary based on aggregations of a table's data.

What is a reflection attack?

In computer security, a reflection attack is a method of attacking a challenge-response authentication system that uses the same protocol in both directions. That is, the same challenge-response protocol is used by each side to authenticate the other side.

What is a root hint server?

The root hints file , also called the cache hints file , contains host information that is needed to resolve names outside of the authoritative DNS domains. It contains the names and addresses of root DNS servers.

What is the use of TXT record in DNS?

A TXT record (short for text record) is a type of resource record in the Domain Name System (DNS) used to provide the ability to associate some arbitrary and unformatted text with a host or other name, such as human readable information about a server, network, data center, and other accounting information.

What is port 53 used for?

TCP port 53 is used for domain transfers; the only reason I can see it being open is if the OP is running a DNS server. DNS servers also listen on UDP port 53 to accept queries from client resolvers.

What is a SOA record?

A start of authority (SOA) record is information stored in a domain name system (DNS) zone about that zone and about other DNS records. A DNS zone is the part of a domain for which an individual DNS server is responsible. Each zone contains a single SOA record.

What is a Cname?

CNAME stands for Canonical Name. CNAME records can be used to alias one name to another. For example, if you have a server where you keep all of your documents online, it might normally be accessed through

What is the AAAA record?

The AAAA record is similar to the A record, but it allows you to point the domain to an Ipv6 address. More information on IPv6 can be found at

List of managed DNS providers

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