IS-IS-Intermediate System-to Intermediate System is a routing protocol designed to move information efficiently within a computer network, a group of physically connected computers or similar devices. It accomplishes this by determining the best route for datagrams through a packet-switched network. The protocol was defined in ISO/IEC 10589:2002 as an international standard within the internet standard (OSI) reference design.
OSPF- Open Shortest Path First is an adaptive routing protocol for internet protocol (IP) networks. It uses a link state routing algorithm and falls into the group of interior routing protocols, operating within a single autonomous system (AS). It is defined as OSPF Version 2 in for Ipv4. There is an updates for Ipv6 that is specified as OSPF Version 3
BGP- Border Gateway Protocol is the protocol backing the core routing decisions on the internet. It maintains a table of IP networks or 'prefixes' which designate network reach ability among autonomous systems
RIPv1 Routing Information Protocol is a dynamic routing protocol used in local and wide area networks
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