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Domain Name System

Domain Name System
The Domain Name System (DNS) is a hierarchical distributed 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 domain names, which can be easily memorized by humans, to the numerical IP addresses needed for the purpose of computer services and devices worldwide. The Domain Name System is an essential component of the functionality of most Internet services because it is the Internet's primary directory service. The Domain Name System distributes the responsibility of assigning domain names and mapping those names to IP addresses by designating authoritative name servers for each domain. Authoritative name servers are assigned to be responsible for their supported domains, and may delegate authority over sub-domains to other name servers. Function[edit] History[edit] Structure [edit] Domain name space[edit]

Related:  Cisco 17. OSI Application LayerHA Gateway Routing

Packet switching Packet switching is a digital networking communications method that groups all transmitted data – regardless of content, type, or structure – into suitably sized blocks, called packets. Overview[edit] An animation demonstrating data packet switching across a network (Click on the image to load the animation) Packet switching features delivery of variable bitrate data streams (sequences of packets) over a computer network which allocates transmission resources as needed using statistical multiplexing or dynamic bandwidth allocation techniques. File Transfer Protocol FTP is built on a client-server architecture and uses separate control and data connections between the client and the server.[1] FTP users may authenticate themselves using a clear-text sign-in protocol, normally in the form of a username and password, but can connect anonymously if the server is configured to allow it. For secure transmission that hides (encrypts) the username and password, and encrypts the content, FTP is often secured with SSL/TLS ("FTPS"). SSH File Transfer Protocol ("SFTP") is sometimes also used instead, but is technologically different. History[edit] The original specification for the File Transfer Protocol was written by Abhay Bhushan and published as RFC 114 on 16 April 1971.

Virtual Router Redundancy Protocol The Virtual Router Redundancy Protocol (VRRP) is a computer networking protocol that provides for automatic assignment of available Internet Protocol (IP) routers to participating hosts. This increases the availability and reliability of routing paths via automatic default gateway selections on an IP subnetwork. VRRP provides information on the state of a router, not the routes processed and exchanged by that router. Each VRRP instance is limited, in scope, to a single subnet. It does not advertise IP routes beyond that subnet or affect the routing table in any way. VRRP can be used in Ethernet, MPLS and token ring networks with Internet Protocol Version 4 (IPv4), as well as IPv6.

Brief History of the Internet - Internet Timeline Barry M. Leiner, Vinton G. Cerf, David D. Clark, Robert E. Simple Sensor Interface protocol The SSI ("Simple Sensor Interface") protocol is a simple communications protocol designed for data transfer between computers or user terminals and smart sensors. The SSI protocol is an Application layer protocol as in the OSI model. The SSI protocol has been developed jointly by Nokia, Vaisala, Suunto, Ionific, Mermit and University of Oulu. Currently SSI is being developed within the Mimosa project, part of the European Union Framework Programmes for Research and Technological Development. The SSI protocol is used in point-to-point communications over UART and networking nanoIP applications.

Configuring 1+1 Backup by High Availability (HA) – Peplink Knowledgebase 1+1 Backup requires a pair of Peplink Balance devices or MAX 700/HD, operating in active-standby mode. When the master device is down, the slave device takes over and handles all the LAN traffic. Peplink Balance 210 or above, MAX 700/HD support High Availability (HA) failover between two Balance/MAX devices based on Virtual Router Redundancy Protocol (VRRP). Online TraceRoute - "Your online IP subnet calculator and network tools collection..." Traceroute is a computer network tool used to determine the route taken by packets across an IP network. The traceroute tool is available on practically all Unix-like operating systems.

Session Initiation Protocol SIP works in conjunction with several other application layer protocols that identify and carry the session media. Media identification and negotiation is achieved with the Session Description Protocol (SDP). For the transmission of media streams (voice, video) SIP typically employs the Real-time Transport Protocol (RTP) or Secure Real-time Transport Protocol (SRTP). For secure transmissions of SIP messages, the protocol may be encrypted with Transport Layer Security (TLS).

Cradlepoint ARC MBR1400 Series Branch Router with Integrated 3G/4G Most ARC MBR1400 models come with an integrated modem included – see available models below. A version with no integrated modem is available for use with USB/ExpressCard modems. Click here to view compatible external modems. U.S. & Canada Carriers Internet protocol suite The Internet protocol suite is the computer networking model and set of communications protocols used on the Internet and similar computer networks. It is commonly known as TCP/IP, because its most important protocols, the Transmission Control Protocol (TCP) and the Internet Protocol (IP), were the first networking protocols defined in this standard. Often also called the Internet model, it was originally also known as the DoD model, because the development of the networking model was funded by DARPA, an agency of the United States Department of Defense.