Updated June 1, 2023
Introduction to DNS
DNS Stands of Domain name system. All computers on the Internet, ranging from your smartphone or laptop and servers that serve content, find and communicate with each other using numbers for large retail sites. These numbers are referred to as IP addresses. You don’t need to remember and enter a long number when you open a web browser and go to a website. You can enter a domain name such as example.com instead and still finish in the right position. Now let’s have a look at the Interview question on DNS.
What is DNS?
DNS associates domain names with the corresponding IP addresses of computers and websites. Domain name with DNS resolution, which makes it easy to remember the whole web address. All communications in each network are done via IP address and the IPs of all websites are hard to remember. We access all websites on the Internet via their domain names rather than IPs. For example, on the back-end, DNS Domain names for IP conversion can be accessed and made accessible to us on other websites such as “google.com or youtube.com,” instead of IP addresses.
What Is Authoritative Name-Server?
Authored name-server provides query response and has an original source configured. An authoritative name server only answers queries of domain names that the administrator has configured. The authoritative name server holds the IP of the domain you want.
What is Forwarder and secondary DNS Server?
If the main DNS server is unable to receive the query, the Forwarder DNS server handles the DNS queries. In this situation, queries are sent to other forwarder DNS servers configured DNS. A secondary DNS server is a server backup to process DNS searches. The secondary DNS server only has a DNS read copy.
Explain the importance of DNS to Active Directory?
In Internet name resolution, DNS plays a central role. In an active directory, you can easily configure the DNS and configure your client’s name resolution. With the standard feature set of DNS, AD may expand and provide new features such as AD-Integration DNS. In foreign DNS environments such as Unix BIND, Active Directory can be easily adapted to exist.
What is DNS Spoofing?
DNS spoofing is an attack in which an attacker changes the DNS records and turns online traffic to a counterfeit site similar to the desired destination. Once you have a user in your account, you may ask for a login to your hacker to steal your login credentials & other sensitive information. This malicious website is often used to distribute viruses on a PC and to provide the hacker with long-term access to your PC.
Explain the Round Robin DNS?
Round Robin DNS is a load distribution method used for the DNS application for a domain name. Suppose we have a w7cloud.com domain and Round Robin DNS has two IP mapping systems for the same w7cloud.com domain.
Recursive DNS RESOLVER?
Recursive DNS RESOLVER is a mid-server that provides the domain IP address of authoritative DNS servers. Any online DNS query will first go to Recursive DNS RESOLVER. The Recursive server takes time to track the DNS record when a client requests DNS queries. After the request information has been collected.
What is stub DNS Zone?
A stub zone is a read-only copy of an area that contains only the resource records needed for identifying the respective authoritative DNS servers, the stub area also used as DNS forwarding, and which is used to solve names between separate DNS namespaces. Such a zone is usually established when a corporate merger or acquisition and when DNS servers for two separate DNS namespaces solve client names in both namespaces.
What is Dynamic DNS?
Dynamic DNS or DDNS is a way to update the DNS record; the DDNS most organizations prefer because it is simple to maintain and the latest IP address on servers and computers is always available.
What are Aging and Scavenging?
The aging and scavenging features on Windows Server DNS servers are supported. The functionality is provided for cleaning and removing stalled resource records from servers and zones. When stamped as stallion, this feature removes dynamically created data. The DNS server service is default to deactivate the aging/scavenging mechanism.
Explain the Query type of DNS?
Basically, there are two types of DNS Query.
1. Iterative Query
2. Recursive Query
Iterative Query: An iterative name query allows the DNS server to give the best response that is possible based on the cache or zone data from a DNS client. If the requested DNS server does not exactly match the queried name, it is a referral which is the best possible information. The DNS client may then search the DNS server it received a reference for.
Recursive Query: In general, this named query is performed by a DNS client to a DNS server or by a DNS server which is configured to pass unresolved name queries to another DNS server for a forwarder-set DNS server.
Conclusion
In this article, we have seen questions which can be asked in an interview related to DNS.
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