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Across 1. The _________ layer provides a standardization process. 5. A message that is broken up into small pieces are known as ______________. 6. Detecting and correcting frame transmit errors are accomplished within the ___________ layer. 8. The _____________ layer is a means of sending data over network devices. 9. Contains the MAC address. 10. Packets are routed according to unique network device addresses in the ____________ layer. 12. Protocol that does not require an acknoledgement. 14. The __________ layer maintains logical links between systems. 17. Is a protocol used mainly for web access. 18. This port is used to transfer data files. 19. There are 32 of the used in IPv4.

Down 2. Compression and de-compression take place in what layer. 3. The _____________ layer can provide riliable and sequential packet delivery through error recovery and flow control mechanisms. 4. Port 25 7. Uses port 143 and only deletesmessages at the users request. 8. Is a small block of data that is sent independently to an end computer. 11. Port 23 13. Uses port 110. Is more desireable when storage space is an issue. 15. Port ________ is used for HTTP. 16. The number of layers in the OSI model. 17. Port 443.