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Blackhole vs Undefined - What's the difference?

blackhole | undefined |

As a noun blackhole

is , especially in the attributive.

As a verb blackhole

is (internet) to redirect (network traffic, etc) nowhere; to discard incoming traffic.

As an adjective undefined is

lacking a definition or value.

blackhole

English

(too many supposedly distinct senses) (Black hole)

Noun

(en noun)
  • , especially in the attributive.
  • (Internet) A place where traffic is silently discarded.
  • (programming) A bit bucket; a place of permanent oblivion for data.
  • (computing) DNSBL, used to block spamming IP addresses – are often called "blackhole lists"
  • (Internet) A blackhole server, a DNS server that handles reverse lookups of invalid IP ranges
    • One way of fighting spam is to use a blackhole''' list maintained on a '''blackhole server.
  • (management) A resource sink.

    • Verb

    (blackhol)
  • (internet) To redirect (network traffic, etc.) nowhere; to discard incoming traffic.
  • * 2005 , Victor Oppleman, Oliver Friedrichs, Brett Watson, Extreme exploits: advanced defenses against hardcore hacks (page 186)
    • Select a nonglobally routed prefix, such as the Test-Net (RFC 3330) 192.0.2.0/24, to use as the next hop of any attacked prefix to be blackholed .

    undefined

    English

    Adjective

    (wikipedia undefined) (-)
  • Lacking a definition or value.
  • (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
    • The result of division by zero is undefined .

    Antonyms

    * defined