key punching - определение. Что такое key punching
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Что (кто) такое key punching - определение

COMPUTER NETWORKING TECHNIQUE
NAT Hole punching; NAT hole punching

Key (music)         
  • ii-V<sup>7</sup>-I progression]] in C [[File:Ii-V-I turnaround in C.mid]]
TONIC NOTE AND CHORD OF A MUSICAL PIECE
Major key; Key (Music); Musical key; Major Key; Key of D; Musical keys; Key coloration; Key relationship; Musical Key; Music key; Minor-key; Minor–key; Major-key; Key of E
In music theory, the key of a piece is the group of pitches, or scale, that forms the basis of a musical composition in classical, Western art, and Western pop music.
Key (cryptography)         
PIECE OF INFORMATION IN CRYPTOGRAPHY
Cryptography/Key; Secret key; Encryption key; Cryptographic keys; Cryptographic key; Key (cryptology); Cryptovariable; Cryptovariables
A key in cryptography is a piece of information, usually a string of numbers or letters that are stored in a file, which, when processed through a cryptographic algorithm, can encode or decode cryptographic data. Based on the used method, the key can be different sizes and varieties, but in all cases, the strength of the encryption relies on the security of the key being maintained.
Natural key         
TYPE OF UNIQUE KEY IN A DATABASE FORMED OF ATTRIBUTES THAT EXIST AND ARE USED IN THE EXTERNAL WORLD OUTSIDE THE DATABASE
Domain key; Business key
A natural key (also known as business keyData modelling: What exactly is a Business Key? by Roy, Rajiv Max.

Википедия

Hole punching (networking)

Hole punching (or sometimes punch-through) is a technique in computer networking for establishing a direct connection between two parties in which one or both are behind firewalls or behind routers that use network address translation (NAT). To punch a hole, each client connects to an unrestricted third-party server that temporarily stores external and internal address and port information for each client. The server then relays each client's information to the other, and using that information each client tries to establish direct connection; as a result of the connections using valid port numbers, restrictive firewalls or routers accept and forward the incoming packets on each side.

Hole punching does not require any knowledge of the network topology to function. ICMP hole punching, UDP hole punching and TCP hole punching respectively use Internet Control Message, User Datagram and Transmission Control Protocols.