2.8, 9 student dormitory building for the new dormitory, because the living area of the core switches are inadequate fiber, nearby choose 7 floor switches two free port direct access to the no. 8 or 9 student dormitory building, the new semester 7,8,9 tower at speeds faster, other time significantly slow speed, especially on Monday to Friday evening and weekend time basic couldn't open the web page (analysis) from the viewpoint of bandwidth,
3. One day, no X teachers dorm room slow speeds, and in the other room with building speed normal analysis (from the physical layer and data link layer),
4. Recently, the whole campus network interruption of hourly time, usually in the restart router, switches can get relief after, but soon network interruption again (from the reason of large area network failure analysis),
5. When setting router Cisco 7604 support Telnet management, from the office of information and network administrator PC Telnet to the router fails, but directly connected routers PC Telnet success (from the access control list (ACL, routing configuration Angle analysis),
6. When through the RJ45 - to - DB9 configuration cable connected to the switch Console port, with the super terminal can not login switches (analysis, from the perspective of the cable),
