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Packet Tracer is a cross-platform visual simulation tool designed by Cisco Systems that allows users to create network topologies and imitate modern computer networks. The software allows users to simulate the configuration of Cisco routers and switches using a simulated command line interface.
Graphical Network Simulator-3 (shortened to GNS3) is a network software emulator first released in 2008. [2] [3] [4] It allows the combination of virtual and real devices, used to simulate complex networks. It uses Dynamips emulation software to simulate Cisco IOS. [2]: 55 [5]
In computer network research, network simulation is a technique whereby a software program replicates the behavior of a real network. This is achieved by calculating the interactions between the different network entities such as routers, switches, nodes, access points, links, etc. [1] Most simulators use discrete event simulation in which the modeling of systems in which state variables ...
the use of explicit hello packets to discover and maintain adjacencies between routers. the use of a reliable protocol to transport routing updates. the use of a feasibility condition to select a loop-free path. the use of diffusing computations to involve the affected part of the network into computing a new shortest path.
An internetwork is the connection of multiple different types of computer networks to form a single computer network using higher-layer network protocols and connecting them together using routers. The Internet is the largest example of internetwork. It is a global system of interconnected governmental, academic, corporate, public, and private ...
Communications protocols use various conventions for distinguishing the elements of a packet and for formatting the user data. For example, in Point-to-Point Protocol, the packet is formatted in 8-bit bytes, and special characters are used to delimit elements. Other protocols, like Ethernet, establish the start of the header and data elements ...
Broadband LAN using Coaxial Cable: Disbanded IEEE 802.8: Fiber Optic TAG: Disbanded IEEE 802.9: Integrated Services LAN (ISLAN or isoEthernet) Disbanded IEEE 802.10: Interoperable LAN Security: Disbanded IEEE 802.11: Wireless LAN (WLAN) & Mesh (Wi-Fi certification) Active IEEE 802.12: 100BaseVG: Disbanded IEEE 802.13: Unused [5] Reserved for ...
Designed principally by Bob Kahn, [73] [74] it was the first wide-area packet-switched network with distributed control. [52] The BBN "IMP Guys" independently developed significant aspects of the network's internal operation, including the routing algorithm, flow control, software design, and network control.