Download PDF by Priscilla Oppenheimer: Troubleshooting Campus Networks: Practical Analysis of Cisco

By Priscilla Oppenheimer

ISBN-10: 0471210137

ISBN-13: 9780471210139

All community designers and directors wish their campus LANs to run successfully. This publication presents guidance and strategies for utilizing protocol analyzers and different instruments to acknowledge difficulties for either Cisco and multiprotocol site visitors patterns.
* specializes in troubleshooting difficulties that come up from the Cisco routers inter-operating with many different community protocols
* Covers either legacy and state-of-the-art technologies
* Authors are revered within the box for his or her educating and coaching improvement abilities in community troubleshooting

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Extra info for Troubleshooting Campus Networks: Practical Analysis of Cisco and LAN Protocols

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The router that decrements the TTL to 0 sends back the TTL exceeded message. The final destination host sends back a port unreachable ICMP message, because the high UDP port number is not a well-known port number. This process allows a user to see a message from every router in the path to the destination, and a message from the destination. Note When executing a trace-route to a Cisco router, keep in mind that the sending of port unreachable messages may be rate limited. The trace-route facility in Microsoft operating systems sends a ping rather than a UDP packet.

For 100-Mbps Ethernet, therefore, a different encoding method was needed. When 100-Mbps Ethernet was developed, the FDDI standards had already documented methods for transmitting data at 100 Mbps. Instead of designing a new solution, the 100BaseX developers adopted techniques used by FDDI on fiber optic cabling and copper UTP cabling. 100BaseFX uses Non Return to Zero, Invert on One (NRZI), as does FDDI. 100BaseTX uses a variation of NRZI that reduces the cycles per second for UTP cabling. The 100BaseTX scheme is called Multiple Level Transition-3 (MLT3).

Repeaters and hubs regenerate a received preamble to avoid the preamble getting shorter as it goes through each repeater that uses some bits for synchronization. Most collisions on Ethernet networks occur in the preamble. ) Depending on the protocol analyzer and Ethernet adapter, you can sometimes see evidence of the collider's preamble when looking at damaged frames. Protocol analyzers show data in hexadecimal form, so you see 0xAA (binary 10101010), or 0x55 (binary 01010101), if the bits have gotten skewed.

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Troubleshooting Campus Networks: Practical Analysis of Cisco and LAN Protocols by Priscilla Oppenheimer


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