Connection Admission Control As An Alternative
Connection-oriented networks (for example ATM systems) can perform Connection Admission Control (CAC) based on traffic contracts. In the context of Voice over IP (VoIP), this is also known as Call Admission Control (CAC).
An application that wishes to use a connection-oriented network to transport traffic must first request a connection (through signalling, for example Q.2931), which involves informing the network about the characteristics of the traffic and the quality of service (QoS) required by the application. This information is matched against a traffic contract. If the connection request is accepted, the application is permitted to use the network to transport traffic.
This function protects the network resources from malicious connections and enforces the compliance of every connection to its negotiated traffic contract.
Difference between CAC and traffic policing is that CAC is an a priori verification (before the transfer occurs), while traffic policing is an a posteriori verification (during the transfer).
Read more about this topic: Traffic Policing
Famous quotes containing the words connection, admission, control and/or alternative:
“What is the vanity of the vainest man compared with the vanity which the most modest person possesses when, in connection with nature and the world, he experiences himself as “man”!”
—Friedrich Nietzsche (1844–1900)
“Powerful, yes, that is the word that I constantly rolled on my tongue; I dreamed of absolute power, the kind that forces to kneel, that forces the enemy to capitulate, finally converting him, and the more the enemy is blind, cruel, sure of himself, buried in his conviction, the more his admission proclaims the royalty of he who has brought on his defeat.”
—Albert Camus (1913–1960)
“The mind is the greatest of all human forces. Control the mind and you control the body.”
—Griffin Jay, Randall Faye, and Lew Landers. Armand Tesla (Bela Lugosi)
“If the alternative is to keep all just men in prison, or give up war and slavery, the State will not hesitate which to choose.”
—Henry David Thoreau (1817–1862)