what is the difference between authoritative and nonauthoritative dns?
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An authoritative answer comes from a nameserver that is considered authoritative for the domain which it's returning a record for (one of the nameservers in the list for the domain you did a lookup on), and a non-authoritative answer comes from anywhere else (a nameserver not in the list for the domain you did a lookup ...
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The main difference between dynamic NAT and static NAT is that static NAT allows a remote host to initiate a connection to a translated host if an access list exists that allows it, while dynamic NAT does not.
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A DNS zone is a portion of the DNS namespace that is managed by a specific organization or administrator. A DNS zone is an administrative space which allows for more granular control of DNS components, such as authoritative nameservers. The domain name space is a hierarchical tree, with the DNS root domain at the top.
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DNS (Domain Name System) - It actually keeps your website name and corresponding IP address to where your website is hosted. Domain Name Server /Nameserver includes A (host) records, CNAME (aliases) records, and MX (mail exchange) records for domain names.
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DNS and some other services work on both the protocols. ... DNS uses TCP for Zone transfer and UDP for name queries either regular (primary) or reverse. UDP can be used to exchange small information whereas TCP must be used to exchange information larger than 512 bytes.
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What are the two important functions that are served by NAT? *It enables an organization to automatically assign its own private IP addresses on an internal network without having to set up many globally unique addresses for use over external networks.
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Primary Vs Secondary DNS. Primary DNS servers host controlling zone files, while secondary DNS servers are used for reliability and redundancy.
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Windows 10, Windows Server 2012 R2/2016/2019 also provide Network Level Authentication (NLA) by default. It is best to leave this in place, as NLA provides an extra level of authentication before a connection is established.
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ICANN does not take down domain names – we have no technical or legal authority to do that. We have no involvement in the takedown of any website, which is an issue of national authority. ... ICANN is the non-profit coordinator of the Internet's global domain name system and is not involved in website content in any way.
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Public DNS is what most people are familiar with. They are generally provided to your business by your ISP. A public DNS maintains a record of publicly available domain names reachable from any device with internet access. Private DNS resides behind a company firewall and maintains records of internal sites.
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We provide nameservers for all domains registered with us (they are called Namecheap BasicDNS) and their values are dns1.registrar-servers.com and dns2.registrar-servers.com. Our BasicDNS/PremiumDNS are anycast DNS servers.
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ISPs take over your DNS queries, collecting data so they can, in turn, serve you ads while you try to access a non-existing domain. Normally if you typed in a nonexistent domain, you would get a response telling you as much, but as your ISP is DNS hijacking you, you instead get redirected to a website full of ads.
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While Nmap now has a fast parallel reverse-DNS system to speed queries, they still can take a substantial amount of time. Disable them with the -n option when you don't need the data. For simple scans (such as ping scans) against a large number of hosts, omitting DNS can sometimes reduce scan time by 20% or more.
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The DKIM DNS record with the long string of gibberish is the public signing key. A domain can have many of these as it has servers with private keys that sign emails. Each of these should have a selector that uniquely identifies it. If there is just one, it may have no selector at all, just "_domainkey".
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DNS is necessary to any Internet-connected organization. DNS provides name resolution between common names, such as www.charrington.net, and the raw IP addresses that are actually used in communications. Active Directory makes extensive use of DNS technology and relies on DNS to locate objects within Active Directory.
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DNS record types, such as 'A', and 'MX' are case sensitive. ... All other DNS record types have case-insensitive values.
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['OpenDNS. 208.67.222.222. Owned by Cisco, OpenDNS has two free options: Family Shield and Home. ... ', 'Cloudflare. 1.1.1.1. ... ', '1.1. 1.1 with Warp. ... ', 'Google Public DNS. 8.8.8.8. ... ', 'Comodo Secure DNS. 8.26.56.26. ... ', 'Quad9. 9.9.9.9. ... ', 'Verisign Public DNS. 64.6.65.6. ... ', 'OpenNIC. 13.239.157.177.']