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I S P  G L O S S A R Y
Your source for the most up-to-date terms, definitions, and acronyms for and about internet service providers.

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black hole
Last modified: Tuesday, August 01, 2006 

Slang term for a router that goes down (offline) and whose absence goes undetected by other routers on the network. Packets that are forwarded to that router simply get dropped and never arrive at their destination. Black holes are unable to generate destination unreachable messages, so users are left unaware that data is being lost.
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Many people use the terms routers, switches and hubs interchangeably. However, the functions of the three devices are all quite different from one another, even if at times they are all integrated into a single device.

Related Categories

Networking Hardware

Networks

Routing

Related Terms

BGP

choke packet

data

Enhanced Interior Gateway Routing Protocol

HSRP

IP address

IP switching

network

offline

packet

packet buffer

packet filtering

router

routing

Routing Information Protocol

routing switch

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