What if my Windows 2000 or Windows Server 2003 DNS server is behind a proxy server or firewall?
Secure services in your network require reverse name resolution to make it more difficult to launch successful attacks against the services. To set this up, you configure a reverse lookup zone and proceed to add records. Which record types do you need to create?
What is the main purpose of a DNS server?
SOA records must be included in every zone. What are they used for?
By default, if the name is not found in the cache or local hosts file, what is the first step the client takes to resolve the FQDN name into an IP address?
What is the main purpose of SRV records?
Before installing your first domain controller in the network, you installed a DNS server and created a zone, naming it as you would name your AD domain. However, after the installation of the domain controller, you are unable to locate infrastructure SRV records anywhere in the zone. What is the most likely cause of this failure?
Which of the following conditions must be satisfied to configure dynamic DNS updates for legacy clients?
At some point during the name resolution process, the requesting party received authoritative reply. Which further actions are likely to be taken after this reply?
Your company uses ten domain controllers, three of which are also used as DNS servers. You have one companywide AD-integrated zone, which contains several thousand resource records. This zone also allows dynamic updates, and it is critical to keep this zone up-to-date.Replication between domain controllers takes up a significant amount of bandwidth. You are looking to cut bandwidth usage for the purpose of replication. What should you do?
You are administering a network connected to the Internet. Your users complain that everything is slow. Preliminary research of the problem indicates that it takes a considerable amount of time to resolve names of resources on the Internet. What is the most likely reason for this?
Can I lookup the IP address of a hostname from javascript?
How do browser cookie domains work?
How to extract top-level domain name (TLD) from URL?
How to configure heroku application DNS to Godaddy Domain?
How to get mx records for a dns name with System.Net.DNS?
How can I do DNS lookups in Python, including referring to /etc/hosts?
What is the difference between 127.0.0.1 and localhost
What is the max size of AF_UNIX datagram message that can be sent in linux?
How to get domain name only using javascript?
How do I find the authoritative name-server for a domain name?
How to overcome root domain CNAME restrictions?
How to reduce the "Time for the first byte" on my website?
Is it possible to have SSL certificate for IP address, not domain name?
How do I clear System.Net client DNS cache?
How might I perform DNS lookups using C/C++ on Linux?
How To Handle Communication Between the Domain and Database Layers?
Is it possible that one domain name has multiple corresponding IP addresses?
How I can know the Domain for an IP by PHP?
How to access/ping a server located on AWS?
How to properly set up DNS SPF records?
How to change the java DNS service provider?
How to create Sub Domains using Cake PHP?
How do I route by domain / subdomain in rails?
How do I get my computer\'s fully qualified domain name in Python?
How to create a subdomain and how do they work?
Dns interview questions and answers on advance and basic Dns with example so this page for both freshers and experienced condidate. Fill the form below we will send the all interview questions on Dns also add your Questions if any you have to ask and for apply
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Top Dns interview questions and answers for freshers and experienced
What is Dns ?
Answer :
Questions : 1 :: What is the use of Domain Name System?
Domain Name Systems are used to help users in finding the location of the web page over the internet. - It provides a unique address that is in the form of strings of numbers and it uniquely...View answers
Questions : 2 :: What is the port no of dns ?
53.
Questions : 3 :: What is a Forward Lookup?
Resolving Host Names to IP Addresses.
Questions : 4 :: What is Reverse Lookup?
It is a file contains host names to IP mapping information.
Questions : 5 :: What is a Resource Record?
It is a record provides the information about the resources available in the N/W infrastructure.
Questions : 6 :: What are the diff. DNS Roles?
Standard Primary, Standard Secondary, & AD Integrated.
Questions : 7 :: How do I set up DNS for a child domain?
To set up DNS for a child domain, create a delegation record on the parent DNS server for the child DNS server. Create a secondary zone on the child DNS server that transfers the parent zone from the...View answers
Questions : 8 :: What if my Windows 2000 or Windows Server 2003 DNS server is behind a proxy server or firewall?
If you are able to query the ISP's DNS servers from behind the proxy server or firewall, Windows 2000 and Windows Server 2003 DNS server is able to query the root hint servers. UDP and TCP Port 53...View answers
Questions : 9 :: Secure services in your network require reverse name resolution to make it more difficult to launch successful attacks against the services. To set this up, you configure a reverse lookup zone and proceed to add records. Which record types do you need to create?
PTR Records
Questions : 10 :: What is the main purpose of a DNS server?
DNS servers are used to resolve FQDN hostnames into IP addresses and vice versa.
Questions : 11 :: SOA records must be included in every zone. What are they used for?
SOA records contain a TTL value, used by default in all resource records in the zone. SOA records contain the e-mail address of the person who is responsible for maintaining the zone. SOA records...View answers
Questions : 12 :: By default, if the name is not found in the cache or local hosts file, what is the first step the client takes to resolve the FQDN name into an IP address?
Performs a recursive search through the primary DNS server based on the network interface configuration
Questions : 13 :: What is the main purpose of SRV records?
SRV records are used in locating hosts that provide certain network services.
Questions : 14 :: Before installing your first domain controller in the network, you installed a DNS server and created a zone, naming it as you would name your AD domain. However, after the installation of the domain controller, you are unable to locate infrastructure SRV records anywhere in the zone. What is the most likely cause of this failure?
The zone you created was not configured to allow dynamic updates. The local interface on the DNS server was not configured to allow dynamic updates.
Questions : 15 :: Which of the following conditions must be satisfied to configure dynamic DNS updates for legacy clients?
The zone to be used for dynamic updates must be configured to allow dynamic updates. The DHCP server must support, and be configured to allow, dynamic updates for legacy clients.
Questions : 16 :: At some point during the name resolution process, the requesting party received authoritative reply. Which further actions are likely to be taken after this reply?
After receiving the authoritative reply, the resolution process is effectively over.
Questions : 17 :: Your company uses ten domain controllers, three of which are also used as DNS servers. You have one companywide AD-integrated zone, which contains several thousand resource records. This zone also allows dynamic updates, and it is critical to keep this zone up-to-date.Replication between domain controllers takes up a significant amount of bandwidth. You are looking to cut bandwidth usage for the purpose of replication. What should you do?
Change the replication scope to all DNS servers in the domain.
Questions : 18 :: You are administering a network connected to the Internet. Your users complain that everything is slow. Preliminary research of the problem indicates that it takes a considerable amount of time to resolve names of resources on the Internet. What is the most likely reason for this?
DNS servers are not caching replies.. Local client computers are not caching replies… The cache.dns file may have been corrupted on the server.
Questions : 19 :: Can I lookup the IP address of a hostname from javascript?
There's no notion of hosts or ip-addresses in the javascript standard library. So you'll have to access some external service to look up hostnames for you.I recommend hosting a cgi-bin which looks...View answers
Questions : 20 :: How do browser cookie domains work?
Although there is the RFC 2965 (Set-Cookie2, had already obsoleted RFC 2109) that should define the cookie nowadays, most browsers don’t fully support that but just comply to the original...View answers
Questions : 21 :: How to extract top-level domain name (TLD) from URL?
from __future__ import with_statementfrom urlparse import urlparse# load tlds, ignore comments and empty lines:with open("effective_tld_names.dat.txt") as tld_file: tlds =...View answers
Questions : 22 :: How to configure heroku application DNS to Godaddy Domain?
here are 2 steps you need to perform, Add the custom domains addon and add the domain your going to use, eg www.mywebsite.com to your application Go to your...View answers
Questions : 23 :: How to get mx records for a dns name with System.Net.DNS?
It's available from NuGet:PM> Install-Package ARSoft.Tools.NetImport the namespace:using ARSoft.Tools.Net.Dns;Then making a synchronous lookup is as simple as:var response =...View answers
Questions : 24 :: How can I do DNS lookups in Python, including referring to /etc/hosts?
mport socketprint socket.gethostbyname('localhost') # result from hosts fileprint socket.gethostbyname('google.com') # your os sends out a dns query
Questions : 25 :: What is the difference between 127.0.0.1 and localhost
If you use 127.0.0.1, then (intelligent) software will just turn that directly into an IP address and use it. Some implementations of gethostbyname will detect the dotted format (and presumably the...View answers
Questions : 26 :: What is the max size of AF_UNIX datagram message that can be sent in linux?
AF_UNIX SOCK_DATAGRAM/SOCK_SEQPACKET datagrams need contiguous memory. Contiguous physical memory is hard to find, and the allocation fails, logging something similar to this on the kernel log:udgc:...View answers
Questions : 27 :: How to get domain name only using javascript?
Use location.host and cut off subdomains and the TLD: var domain = (location.host.match(/([^.]+).w{2,3}(?:.w{2})?$/) || [])[1]update: as @demix pointed out, this fails for 2 and 3-letter...View answers
Questions : 28 :: How do I find the authoritative name-server for a domain name?
You'll want the SOA (Start of Authority) record for a given domain name, and this is how you accomplish it using the universally available nslookup command line tool:command line>...View answers
Questions : 29 :: How to overcome root domain CNAME restrictions?
Questions : 30 :: How to reduce the "Time for the first byte" on my website?
Given that's the case, the following code will give a TTFB of (network latency +) 2s:<?php ob_start(); ?><!doctype html><html> ...View answers
Questions : 31 :: Is it possible to have SSL certificate for IP address, not domain name?
As for how to get it: I would tend to simply try and order one with the provider of your choice, and enter the IP address instead of a domain during the ordering process.However, running a site on an...View answers
Questions : 32 :: How do I clear System.Net client DNS cache?
ServicePointManager.DnsRefreshTimeout = 0;As I unwound all the weird things I'd tried previously, I discovered one other setting that I need along with the one above; on the request object, turn off...View answers
Questions : 33 :: How might I perform DNS lookups using C/C++ on Linux?
If a blocking (synchronous) query is ok, just use res_query(), and link your program with -lresolv. len = res_query(host, C_IN, T_MX, &answer, sizeof(answer));
Questions : 34 :: How To Handle Communication Between the Domain and Database Layers?
Any of these sorts of architectural issues are driven by non-functional requirements like performance; in addition, there is a correctness issue here, in that you want to make sure updates are done...View answers
Questions : 35 :: Is it possible that one domain name has multiple corresponding IP addresses?
This is round robin DNS. This is a quite simple solution for load balancing. Usually DNS servers rotate/shuffle the DNS records for each incoming DNS request. Unfortunately it's not a real solution...View answers
Questions : 36 :: How I can know the Domain for an IP by PHP?
A single IP address can host a potentially unlimited number of domains. Domains returned by gethostbyaddr will give the domain name(s) from the PTR DNS records for that IP. A reverse DNS record (PTR)...View answers
Questions : 37 :: How to access/ping a server located on AWS?
To do this on the command line you can run:ec2-authorize <group> -P icmp -t -1:-1 -s 0.0.0.0/0Or if you prefer the AWS Console, this is what it would look like (current as of...View answers
Questions : 38 :: How to properly set up DNS SPF records?
"v=spf1 include:amazonses.com ~all""spf2.0/pra include:amazonses.com ~all"Accordingly, here is our domain's abbreviated result for the test you have been running:SPF record lookup and validation...View answers
Questions : 39 :: How to change the java DNS service provider?
Put the dnsjava.jar file in the classpath of your application.
Have the system property set before launching the main method in your application.
Questions : 40 :: How to create Sub Domains using Cake PHP?
With the wildcard DNS record in place, you can then use HTTP_HOST, or the CakePHP way, $request->host() to determine the hostname (subdomain) being used to access your system. You can then load...View answers
Questions : 41 :: How do I route by domain / subdomain in rails?
You should check out the request_routing plugin. It allows you to easily route request by: subdomain, domain, method, port, remote_ip, content_type, protocol, etc.
Questions : 42 :: How do I get my computer's fully qualified domain name in Python?
The fully qualified domain name is returned by socket.getfqdn().
Questions : 43 :: How to create a subdomain and how do they work?
DNS is built off of a hierarchy for scale-ability and/or for granularity.
If we take the a domain like www.stackoverflow.com. and break it down, here is what we get.
www - This is the host...View answers
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