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    My DNS

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    EU Caylan Soliven
    The document discusses the Domain Name System (DNS), which maps domain names to IP addresses. It defines DNS as the server service that performs this mapping. Root servers contain the IP addresses of top-level domain (TLD) registries like .com and country code domains like .uk. DNS uses a hierarchical naming structure with top-level domains at the top, followed by second-level and then third-level domains. DNS servers work by resolving domain name requests through this hierarchy from local DNS servers to root servers to authoritative name servers.

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    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd

    My DNS

    Uploaded by

    EU Caylan Soliven
    42 views12 pages
    The document discusses the Domain Name System (DNS), which maps domain names to IP addresses. It defines DNS as the server service that performs this mapping. Root servers contain the IP addresses of top-level domain (TLD) registries like .com and country code domains like .uk. DNS uses a hierarchical naming structure with top-level domains at the top, followed by second-level and then third-level domains. DNS servers work by resolving domain name requests through this hierarchy from local DNS servers to root servers to authoritative name servers.

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    My_DNS

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    The document discusses the Domain Name System (DNS), which maps domain names to IP addresses. It defines DNS as the server service that performs this mapping. Root servers contain the IP addresses of top-level domain (TLD) registries like .com and country code domains like .uk. DNS uses a hierarchical naming structure with top-level domains at the top, followed by second-level and then third-level domains. DNS servers work by resolving domain name requests through this hierarchy from local DNS servers to root servers to authoritative name servers.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    42 views12 pages

    My DNS

    Uploaded by

    EU Caylan Soliven
    The document discusses the Domain Name System (DNS), which maps domain names to IP addresses. It defines DNS as the server service that performs this mapping. Root servers contain the IP addresses of top-level domain (TLD) registries like .com and country code domains like .uk. DNS uses a hierarchical naming structure with top-level domains at the top, followed by second-level and then third-level domains. DNS servers work by resolving domain name requests through this hierarchy from local DNS servers to root servers to authoritative name servers.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 12

    What is DNS?

     Domain Name System/Service


     is the server service that maps domain name to IP
    addresses

      Root server
     A root server is any of the small number domain name
    system (DNS) servers on the Internet that contain the IP
    addresses of the top level domain (TLD) registry
    organizations that maintain the global domains
    (e.g., .com, .org, net, .gov and .edu) and the country code
    domains (e.g., .uk, .ca, .cn, .dk, .fr, and .jp).
    DNS
    • The “Domain Name System”
    Created in 1983 by Paul Mockapetris
    • The Internet users use DNS to reference anything by
    name on the Internet
    • The mechanism by which Internet software translates
    names to addresses and vice versa
    • IP assigns 32-bit addresses to hosts (interfaces)
    a) Binary addresses are easy for computers to manage .
    b) All applications use IP addresses through the TCP/IP
    protocol software.
    • Domain names comprise a hierarchy so that names are
    unique, easy to remember.
    Domain Names
    • A domain name is the sequence of labels from a node to the root,
    separated by dots (“.”s), read left to right
    • Example domain names:
     yemen.net.ye
     Yahoo.com
    &SubDomain Name
    • one domain is a sub-Domain of another if its domain
    name ends in the other’s domain name
    A. So yemen.net.ye is a subdomain of
    a) net.ye
    b) ye
    B. google.com is a subdomain of com.
    DNS Naming Structure
    • Top level domains TLDs defined by global authority
     com, org,
     edu.

    • ccTLD: country code TLDs .


     ye

    • 2nd Level Domains.


     net.ye
     google.com
    Top-Level Domains (TLDs)
    Country Code Domains
    • Top level domains are US-centric .
    • Geographic TLDs used for organizations in other
    countries:
    TLD Country
    .uk United Kingdom
    .fr France
    .ye Yemen
    • Countries define their own internal hierarchy:
     gov.ye, org.ye ,net.ye , edu.ye and com.ye
    are used for organizations in Yemen
    Second-Level Domains
    • Within every top-level domain there is a huge list of 2nd
    level domains
    • For example, in the COM second-level domain, you've
    got:
     yahoo
     msn
     microsoft
     plus millions of others...
    DNS naming structure Example
    Examples:
    2nd LD TLD

    Google .com
    ccTLD

    yemen .net .ye

    3rd LD 2nd LD
    How DNS Servers work
    You type http://www.google.com into your web browser and hit enter.

    Step 1: Your PC sends a resolution request to its configured


    DNS Server, typically at your ISP.
    Step 2: Your ISPs recursive name server starts by asking
    one of the root servers predefined in its “hints” file.
    Step 3: Your ISPs recursive name server then asks one of the
    “com” name servers as directed.
    Very briefly about the DNS
    The Domain Name System (abbreviated DNS) is simply
    put like the phone book of the Internet. It helps us, the users,
    keep track of website names like pingdom.com or
    google.com, rather than having to remember the IP-address
    that the computer needs to start any form of communication.
    The DNS lets you surf the Internet with your web browser
    using URLs, which are far more handy and easy to remember
    than IP-addresses, but it also helps our emails find their way
    to the proper recipients.
    So in short, the DNS is absolutely essential for everyone
    using the Internet.

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