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ARPANET: The Advanced Research Projects Agency Network was the first wide-area packet-switching network with distributed control and one of the first networks to implement the TCP/IP protocol suite. Both technologies became the technical foundation of the Internet.
ARP spoofing: In computer networking, ARP spoofing, ARP cache poisoning, or ARP poison routing, is a technique by which an attacker sends Address Resolution Protocol (ARP) messages onto a local area network. Generally, the aim is to associate the attacker's MAC address with the IP address of another host, such as the default gateway, causing any traffic meant for that IP address to be sent to the attacker instead.
Arpeggio of Blue Steel: Arpeggio of Blue Steel is a Japanese manga series produced by Ark Performance and serialized in Shōnen Gahosha's Young King Ours. Nineteen manga volumes have been released and an anime series by Sanzigen aired from October 7, 2013, to December 23, 2013.