Configurations
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| Border Gateway Protocol (BGP) | Used between Internet service providers (ISP) as well as between ISPs and their larger private clients to exchange routing information.
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| Dynamic Routing Protocols | Exchange of routing information between routers. Dynamically learn information about remote networks and determines the best path to each network.
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| Routing Protocol | A set of processes, algorithms, and messages that are used to exchange routing information and populate the routing table with the routing protocol's choice of best paths.
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| Algorithm | A finite list of steps used in accomplishing a task
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| Autonomous System (AS) | Is a collection of routers under a common administration.
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| Interior Gateway Protocols (IGP) | Used for intra-autonomous system routing which is routing inside an autonomous system
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| Exterior Gateway Protocols (EGP) | Used for inter-autonomous system routing which is routing between autonomous systems
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| Distance Vector | Routes are advertised as vectors of distance and direction.
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| Classful Routing Protocols | Do not send subnet mask information in routing updates.
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| Classless Routing Protocols | Include the subnet mask with the network address in routing updates
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| Convergence | When the routing tables of all routers are at a state of consistency.
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| Convergence Time | The time it takes routers to share information, calculate best paths and update their routing tables
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| Metrics | Is a way to measure or compare in order to determine which route is the best path and assign costs to reach remote networks.
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| Neighbors | Are routers that share a link and use the same routing protocol.
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| Network discovery | A part of the process of the routing protocol algorithm that enables routers to first learn about remote networks
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| Split Horizon | Prevents information from being sent out the same interface from which it was received
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| Periodic Updates | Refers to the fact that a router sends the complete routing table to its neighbors at a predefined interval.
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| Triggered Update | Is a routing table update that is sent immediately in response to a routing change.
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| Routing Loop | A condition in which a packet is continuously transmitted within a series of routers without ever reaching its intended destination network.
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| Count To Infinity | Is a condition that exists when inaccurate routing updates increase the metric value to "infinity" for a network that is no longer reachable.
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| Route Poisoning | Used to mark the route as unreachable in a routing update that is sent to other routers.
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| Time To Live (TTL) | Is an 8-bit field in the IP header that limits the number of hops a packet can traverse through the network before it is discarded.
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