Presentation: the domain name system
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The document discusses the domain name system (DNS) and how it translates domain names to IP addresses. It provides details on: 1) DNS maps domain names like "example.com" to IP addresses so computers can be identified. 2) A domain name contains multiple parts like the second-level domain ("example") and top-level domain (TLD) (".com"). 3) Domain registrars assign domain names and keep records of the mappings between names and IP addresses in DNS servers.
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The document discusses DNS (Domain Name System) records. It explains that DNS is a hierarchical naming system that maps hostnames to IP addresses. DNS records are the basic data elements that allow DNS servers to perform this mapping. The document describes several important DNS record types including A records, which map hostnames to IPv4 addresses; AAAA records, which map to IPv6 addresses; CNAME records, which map aliases to hostnames; and MX records, which specify mail servers for a domain. It also briefly mentions SOA, PTR, and SRV records along with sources for further information on DNS records.
DNS - Domain Name System
Overview of the Domain Name System (DNS).
In the early days of the Internet, hosts had a fixed IP address.
Reaching a host required to know its numeric IP address.
With the growing number of hosts this scheme became quickly awkward and difficult to use.
DNS was introduced to give hosts human readable names that would be translated into a numeric IP addresses on the fly when a requesting host tried to reach another host.
To facilitate a distributed administration of the domain names, a hierarchic scheme was introduced where responsibility to manage domain names is delegated to organizations which can further delegate management of sub-domains.
Due to its importance in the operation of the Internet, domain name servers are usually operated redundantly. The databases of both servers are periodically synchronized.
DNS Presentation
The document discusses the Domain Name System (DNS) which translates human-friendly domain names to IP addresses. It describes DNS as the internet's equivalent of a phone book. DNS uses a hierarchical, domain-based naming scheme and distributed database to implement this naming system. The DNS database contains resource records (RRs) that map domain names to IP addresses and other attributes. There are different types of name servers, including authoritative, caching, primary, and secondary servers that maintain the DNS database and resolve queries. DNS resolution can occur through either recursive or iterative queries to translate names to addresses.
Domain name server
Domain Name System (DNS) is a hierarchical naming system that maps domain names to IP addresses. DNS maintains the domain namespace and provides translation between domain names and IP addresses using DNS name servers and a communication protocol. DNS refers to the data query service, system of mapping names to IP addresses hierarchically, and DNS servers that translate host names to IP addresses. Before DNS was invented, host name to IP address mappings were stored in a file. DNS was developed in the 1980s and the dominant DNS software, BIND, was introduced. Security vulnerabilities include cache poisoning, client flooding, and dynamic update vulnerabilities. Efforts are made to improve DNS security.
Presentation on dns
The document discusses the Domain Name System (DNS), which translates domain names to IP addresses and vice versa. It describes the hierarchical structure of DNS with zones, resource records, and name servers. Primary and secondary name servers maintain authoritative data for zones, while caching name servers store previously looked up data to improve performance. The domain name resolution process involves queries to authoritative and caching name servers to map names to addresses.
Domain Name System
The Domain Name System (DNS) was invented in 1983 to translate between hostnames that are easy for humans to remember and IP addresses that computers use, through a hierarchical system where each part of a domain name separates levels of delegation down to individual host machines, with top-level domains and country domains at the top level managed by centralized authoritative name servers. DNS uses a distributed database across multiple name servers that can query each other to lookup and cache hostname to IP mappings, using both UDP and TCP protocols to handle queries and full database replication respectively.
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The document discusses DNS (Domain Name System) records. It explains that DNS is a hierarchical naming system that maps hostnames to IP addresses. DNS records are the basic data elements that allow DNS servers to perform this mapping. The document describes several important DNS record types including A records, which map hostnames to IPv4 addresses; AAAA records, which map to IPv6 addresses; CNAME records, which map aliases to hostnames; and MX records, which specify mail servers for a domain. It also briefly mentions SOA, PTR, and SRV records along with sources for further information on DNS records.
DNS - Domain Name System
Overview of the Domain Name System (DNS).
In the early days of the Internet, hosts had a fixed IP address.
Reaching a host required to know its numeric IP address.
With the growing number of hosts this scheme became quickly awkward and difficult to use.
DNS was introduced to give hosts human readable names that would be translated into a numeric IP addresses on the fly when a requesting host tried to reach another host.
To facilitate a distributed administration of the domain names, a hierarchic scheme was introduced where responsibility to manage domain names is delegated to organizations which can further delegate management of sub-domains.
Due to its importance in the operation of the Internet, domain name servers are usually operated redundantly. The databases of both servers are periodically synchronized.
DNS Presentation
The document discusses the Domain Name System (DNS) which translates human-friendly domain names to IP addresses. It describes DNS as the internet's equivalent of a phone book. DNS uses a hierarchical, domain-based naming scheme and distributed database to implement this naming system. The DNS database contains resource records (RRs) that map domain names to IP addresses and other attributes. There are different types of name servers, including authoritative, caching, primary, and secondary servers that maintain the DNS database and resolve queries. DNS resolution can occur through either recursive or iterative queries to translate names to addresses.
Domain name server
Domain Name System (DNS) is a hierarchical naming system that maps domain names to IP addresses. DNS maintains the domain namespace and provides translation between domain names and IP addresses using DNS name servers and a communication protocol. DNS refers to the data query service, system of mapping names to IP addresses hierarchically, and DNS servers that translate host names to IP addresses. Before DNS was invented, host name to IP address mappings were stored in a file. DNS was developed in the 1980s and the dominant DNS software, BIND, was introduced. Security vulnerabilities include cache poisoning, client flooding, and dynamic update vulnerabilities. Efforts are made to improve DNS security.
Presentation on dns
The document discusses the Domain Name System (DNS), which translates domain names to IP addresses and vice versa. It describes the hierarchical structure of DNS with zones, resource records, and name servers. Primary and secondary name servers maintain authoritative data for zones, while caching name servers store previously looked up data to improve performance. The domain name resolution process involves queries to authoritative and caching name servers to map names to addresses.
Domain Name System
The Domain Name System (DNS) was invented in 1983 to translate between hostnames that are easy for humans to remember and IP addresses that computers use, through a hierarchical system where each part of a domain name separates levels of delegation down to individual host machines, with top-level domains and country domains at the top level managed by centralized authoritative name servers. DNS uses a distributed database across multiple name servers that can query each other to lookup and cache hostname to IP mappings, using both UDP and TCP protocols to handle queries and full database replication respectively.
Dns 2
The document discusses the Domain Name System (DNS), explaining that it is a globally distributed database that translates human-friendly website addresses into computer-friendly IP addresses and vice versa. DNS uses a hierarchical system to organize domain names and resolve queries through recursive or iterative processes, with DNS messages containing header, question, answer, and additional record sections to facilitate name-address mapping.
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Dns
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The document discusses the Domain Name System (DNS). It describes DNS as a hierarchical and distributed database that maps hostnames to IP addresses. DNS uses a tree structure with nodes containing domain names that are read from the node up to the root. The document outlines the key components of DNS including fully and partially qualified domain names, zones, primary and secondary name servers, and the different top-level domains like generic, country, and inverse domains used for name to address and address to name lookups.
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Domain Name System
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Domain name system
The document discusses the Domain Name System (DNS) which maps domain names to IP addresses. It describes how DNS works hierarchically with a root server at the top level, below which are generic, country-specific and other domain levels. DNS servers store and distribute this mapping information across multiple computers to avoid a single point of failure. Primary DNS servers store and update zone files mapping domain names to IP addresses, while secondary servers transfer this information from primary servers.
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This document discusses the Domain Name System (DNS) and how it maps human-friendly domain names to IP addresses. It explains that DNS information is stored in a distributed database and domain names are registered through registrars like Network Solutions. Various DNS record types are described, like A records for IP addresses and MX records for mail servers. Finally, common DNS tools are listed, such as whois, nslookup, and host, for looking up domain information and IP addresses.
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The document discusses the Domain Name System (DNS), explaining that it is a globally distributed database that translates human-friendly website addresses into computer-friendly IP addresses and vice versa. DNS uses a hierarchical system to organize domain names and resolve queries through recursive or iterative processes, with DNS messages containing header, question, answer, and additional record sections to facilitate name-address mapping.
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The document discusses the need for and history of the Domain Name System (DNS). It explains that DNS was created to map human-friendly domain names to IP addresses and vice versa. Originally, a single host file contained all name-IP mappings but this became infeasible as the internet grew. DNS addresses this by hierarchically dividing the name space and distributing the mappings across multiple name servers. It uses a tree structure with domains like .com, .edu at the top level and subdomains below. DNS servers are authoritative for different zones and work together to resolve queries through either recursive or iterative queries.
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DNS is a distributed database that translates hostnames to IP addresses. It operates through a hierarchy of root servers, top-level domain servers, and authoritative name servers. DNS provides additional services like load balancing and mail server aliasing. Queries are resolved through recursive or iterative lookups between clients and servers to map names to addresses.
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The document discusses the Domain Name System (DNS). It describes DNS as a hierarchical and distributed database that maps hostnames to IP addresses. DNS uses a tree structure with nodes containing domain names that are read from the node up to the root. The document outlines the key components of DNS including fully and partially qualified domain names, zones, primary and secondary name servers, and the different top-level domains like generic, country, and inverse domains used for name to address and address to name lookups.
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The document is a presentation on DNS (Domain Name System) given by Mauood Hamidi for his dissertation. It covers definitions of DNS, different types of DNS servers, tools used for DNS queries, DNS records, how DNS works to resolve domain names to IP addresses, and components of the DNS system like zones, name servers, and security considerations. It aims to provide an overview of the key concepts and functioning of DNS.
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Domain Name System (DNS) is a hierarchical distributed database that contains mappings of domain names to IP addresses. DNS allows easy to remember domain names to be used instead of hard to remember IP addresses. It works by matching domain names to IP addresses through a lookup process involving root servers, top-level domain servers and authoritative name servers. This allows computers all over the world to communicate with each other using domain names.
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A DHCP scope defines a range of IP addresses that a DHCP server can assign to clients on a particular subnet. Scopes must be defined and activated before clients can obtain IP addresses from the DHCP server. Scopes can be configured for each subnet and common properties of scopes include the IP address range, subnet mask, lease duration, and scope name.
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DHCP is a protocol that dynamically assigns IP addresses and other network configuration parameters to devices on a network. It uses a client-server model where DHCP clients make requests to DHCP servers which maintain pools of addresses. A DHCP client will broadcast requests at initialization and use a 4-step process to get an address assigned. It will later enter renewal states to extend its lease before initialization again if needed. This allows for efficient dynamic allocation and management of IP addresses on a network.
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This document provides an overview of the Domain Name System (DNS) and why it needs to be secured. It discusses the history and evolution of DNS from its origins in host files to its current hierarchical structure. The document also describes how DNS Secure Extensions (DNSSEC) works to secure DNS through digital signatures and a chain of trust from the root zone down. It explains common DNS security threats like cache poisoning and how DNSSEC aims to prevent them.
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This document provides an overview of the Domain Name System (DNS) including its hierarchical structure, services, and protocol. DNS acts as a distributed database that maps hostnames to IP addresses and vice versa. It is implemented through a global hierarchy of root servers, top-level domain servers like .com and .edu, and authoritative name servers for each organization. DNS uses a query/response system to look up mappings in a recursive or iterative process. Caching improves efficiency.
Domain Name System
The Domain Name System (DNS) is a hierarchical decentralized naming system for computers, services, or any resource connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities. Most prominently, it translates more readily memorized domain names to the numerical IP addresses needed for the purpose of locating and identifying computer services and devices with the underlying network protocols. By providing a worldwide, distributed directory service, the Domain Name System is an essential component of the functionality of the Internet.
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This document provides an overview of LDAP (Lightweight Directory Access Protocol):
- LDAP is a protocol for querying and modifying directory services running over TCP/IP networks. It allows clients to retrieve and store information about users, computers, applications and other network resources from a central directory server.
- A directory in LDAP refers to a specialized database that stores information in an organized manner to be easily shared among applications. The directory structure follows a tree hierarchy defined by distinguished names.
- Common LDAP operations include binding, searching, comparing, adding, deleting and modifying directory entries. Microsoft Active Directory is a widely used LDAP-compliant directory service that centralizes user authentication and authorization.
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This document provides an overview of the Domain Name System (DNS) and discusses some of its security and censorship implications. It begins with an introduction to DNS basics like its hierarchical structure and mapping of domain names to IP addresses. It then covers security issues such as DNS spoofing, cache poisoning, and reflection attacks. The document also discusses how DNS is used for censorship through blocking domain name resolutions or injecting false DNS responses. Overall, the document provides a high-level tour of the DNS system and some of the ways it can be exploited or manipulated for malicious purposes.
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Internet domain names have a hierarchical tree structure, with top-level domains like .com and country-level domains like .uk further divided into subordinate domains. The Domain Name System (DNS) converts these domain names into IP addresses through a recursive lookup process involving root servers, top-level domain servers, and authoritative name servers. DNS is crucial for routing Internet traffic by translating between hostnames that are easy for people to remember and the IP addresses computers use to connect.
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Presentation: the domain name system
- 1. The domain name system (DNS) Skills : none IT concepts : domain, domain name, host, IP address, domain registrar This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.
- 3. Domain names We refer to computers on the Internet (Internet hosts ), by names like: bpastudio.csudh.edu These are called domain names or, if you want to be really geeky, “fully qualified domain names.” The key point is that the name identifies a particular computer – no two hosts have the same domain name.
- 7. A unique host bpastudio.csudh.edu This is the domain name of a unique host. It is a member of the csudh.edu domain, but it is the only one with the name bpastudio . It is like a family – all the brothers and sisters have the same last name, but it would be confusing if two of them also had the same first name.
- 12. Regstering a domain – check for availability
- 13. Larrypress.com was taken, but these are available and for sale
- 15. Some hosts in the csudh.edu domain We are letting muphiepsilon.org use a computer on our campus. IP address Domain name 155.135.55.17 library.csudh.edu 155.135.55.13 home.muphiepsilon.org 155.135.55.11 music1.csudh.edu 155.135.55.8 toro3.csudh.edu 155.135.55.6 vaquero.csudh.edu 155.135.55.2 ns1.csudh.edu 155.135.1.180 email.csudh.edu 155.135.1.166 ctl.csudh.edu 155.135.1.163 sws.csudh.edu
- 16. Some hosts in the csudh.edu domain Every domain has a domain name server (DNS). Our DNS is ns1.csudh.edu. It does the IP address lookups for TCP. . IP address Domain name 155.135.55.17 library.csudh.edu 155.135.55.13 home.muphiepsilon.org 155.135.55.11 music1.csudh.edu 155.135.55.8 toro3.csudh.edu 155.135.55.6 vaquero.csudh.edu 155.135.55.2 ns1.csudh.edu 155.135.1.180 email.csudh.edu 155.135.1.166 ctl.csudh.edu 155.135.1.163 sws.csudh.edu