answer:Packet filters act by inspecting the ``packets'' which are transferred between computers on the Internet. If a packet does not match the packet filter's set of filtering rules, the packet filter will drop (silently discard) the packet or reject it (discard it, and send ``error responses'' to the source). Conversely, if the packet matches one or more of the programmed filters, the packet is allowed to pass. This type of packet filtering pays no attention to whether a packet is part of an existing stream of traffic (i.e. it stores no information on connection ``state''). Instead, it filters each packet based only on information contained in the packet itself (most commonly using a combination of the packet's source and destination address, its protocol, and, for TCP and UDP traffic, the port number). TCP and UDP protocols constitute most communication over the Internet, and because TCP and UDP traffic by convention uses well known ports for particular types of traffic, a ``stateless'' packet filter can distinguish between, and thus control, those types of traffic (such as web browsing, remote printing, email transmission, file transfer), unless the machines on each side of the packet filter are both using the same non-standard ports.

answer:As the teams play in different conferences, the two teams only meet during the regular season once every four years when all four AFC East clubs play all four NFC East clubs. In addition to annual preseason matchups, the only other way the two teams would meet would be in the Super Bowl, which has never occurred.

answer:Following consecutive losses to Mexico and Costa Rica in the opening games of the final round of qualification for the 2018 FIFA World Cup, Klinsmann was removed as national team coach and technical director and replaced by previous U.S. manager Bruce Arena. World Cup qualification resumed on March 24, 2017, where Arena and his team had a record 6--0 win over Honduras. Four days later, the team traveled to Panama City, drawing Panama 1--1. After beating Trinidad and Tobago 2--0, the U.S. got their third ever result in World Cup Qualification at the Estadio Azteca when they drew 1--1 against Mexico. In July 2017, the U.S. won their sixth CONCACAF Gold Cup with a 2--1 win over Jamaica in the final. Following an agonizing 2--1 defeat to Trinidad and Tobago on October 10, 2017, the U.S. failed to qualify for the 2018 World Cup, missing the tournament for the first time since 1986. On October 13, 2017, Arena resigned. Many pundits and analysts called this the worst result and worst performance in the history of the national team.

answer:A graduate school (sometimes shortened as grad school) is a school that awards advanced academic degrees (i.e. master's and doctoral degrees) with the general requirement that students must have earned a previous undergraduate (bachelor's) degree with a high grade point average. A distinction is typically made between graduate schools (where courses of study vary in the degree to which they provide training for a particular profession) and professional schools, which offer specialized advanced degrees in professional fields such as medicine, nursing, business, engineering, speech-language pathology, or law. The distinction between graduate schools and professional schools is not absolute, as various professional schools offer graduate degrees and vice versa.