AT&T vs Cisco

AT&T Inc. is an American multinational telecommunications corporation, headquartered at Whitacre Tower in downtown Dallas, Texas. AT&T Inc. began its existence as Southwestern Bell Corporation, one of seven Regional Bell Operating Companies created in 1983 in the divestiture of the American Telephone and Telegraph Company following the 1982 United States v. AT&T antitrust lawsuit. Southwestern Bell changed its name to SBC Communications Inc. in 1995. In 2005, SBC purchased former parent AT&T Corp. and took on its branding, with the merged entity naming itself AT&T Inc. and using the iconic AT&T Corp. logo and stock-trading symbol.

Cisco Systems, Inc. is an American multinational technology company headquartered in San Jose, California, that designs, manufactures, and sells networking equipment. Cisco is the worldwide leader in networking for the Internet, and it supports, manages and operates business systems for various and major third parties. Cisco Systems was founded in December 1984 by Leonard Bosack, who was in charge of the Stanford University computer science (CS) department's computers, and Sandy Lerner, who managed the Graduate School of Business' computers.