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Graphics Interchange Format  |  1997-10-26  |  25.8 KB  |  466x338  |  4-bit (16 colors)
   ocr: Figure 1a Controlling access via packet fitering internet Router Packet Filtering: address OK, port OK Telnet MAIL Server Web Server Server 123.45.67.9 123.45.67.10 123.45.67.8