P-Z

• Parity check


  : Technique that incorporates an extra bit into the structure of a bit string when it is created or transmitted.
• Password


  : Secret code entered by the user to gain access to the data files.
• Ping


  : An Internet maintenance tool to test the state of network congestion and determine whether a particular host computer is connected and available on the network.
• Polling


  : Popular technique for establishing communication sessions in WANs.
• Private key


  : A method of encryption in which the recipient keeps the key secret.
• Public key encryption

  : Technique that uses two keys: one for encoding the message and the other for decoding it.
• Public key infrastructure (PKI)


  : It constitutes the policies and procedures for administering this activity.
• Request-response technique


  : Technique in which a control message from the sender and a response from the sender are sent at periodic synchronized intervals.
• Reusable password


  : A network password that can be used more than one time.
• Ring topology


  : Topology that eliminates the central site. All nodes in this configuration are of equal status.
• Rivest-Shamir-Adleman (RSA)


  : It is a highly secure public key cryptography method.
• Screening router


  : A router that examines the source and destination addresses that are attached to incoming message packets.
• Triple-DES encryption


  : It is an enhancement to an older encryption technique called the data encryption standard (DES).
• Trojan horse


  : Program that attaches to another legitimate program but does not replicate itself like a virus.
• Virus


  : Program that attaches itself to a legitimate program to penetrate the operating system.
• Worm


  : Software program that “burrows” into the computer’s memory and replicates itself into areas of idle memory.
• Zombie


  : The perpetrator of a Distributed Denial of Service (DDoS) attack may employ a virtual army of robot computers to launch the attack.