Digital tech crossword puzzle

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Across
  1. 3. Global specification that enables users of wireless devices to access and interact with wireless information services and applications
  2. 5. A device that adapts a computer to a digital ISDN line
  3. 7. controls access to the network and monitors the flow of network traffic
  4. 8. Connects two different networks together
Down
  1. 1. Can be flipped
  2. 2. A combination transmitter/receiver in a single package
  3. 4. A computer that sits between different networks or applications
  4. 6. A hardware device about the size of an external modem that converts digital data frames from the communications technology used on a local area network (LAN) into frames appropriate to a wide-area network (WAN) and vice versa.