TAILIEUCHUNG - Teach Yourself TCP/IP in 14 Days Second Edition phần 2

Các cuộc tấn công khủng bố ngày 11 tháng chín năm 2001, thay đổi trọng tâm của bảo mật mãi mãi. Nhiều nhà bình luận đã so sánh chi nhánh trên toàn thế giới của các sự kiện để những người Sử dụng Sniffer Pro để tìm các lỗ trong mạng của bạn | Simpo PDF Merge and Split Unregistered Version - http It is usually easy to tell wHicH type of EtHernet network is being used by cHecking tHe connector to a network card. If it Has a telepHone-style plug it is lOBaseT. THe cable for lOBaseT looks tHe same as telepHone cable. If tHe network Has a D-sHaped connector witH many pins in it it is lOBase5. A lOBase2 network Has a connector similar to a cable TV coaxial connector except it locks into place. THe lOBase2 connector is always circular. THe size of a network is also a good indicator. lOBase5 is used in large networks witH many devices and long transmission runs. lOBase2 is used in smaller networks usually witH all tHe network devices in fairly close proximity. Twisted-pair lOBaseT networks are often used for very small networks witH a maximum of a few dozen devices in close proximity. EtHernet and TCP IP work well togetHer witH EtHernet providing tHe pHysical cabling layers one and two and TCP IP tHe communications protocol layers tHree and four tHat is broadcast over tHe cable. THe two Have tHeir own processes for packaging information TCP IP uses 32-bit addresses wHereas EtHernet uses a 48-bit scHeme. THe two work togetHer However because of one component of TCP IP called tHe Address Resolution Protocol ARP wHicH converts between tHe two scHemes. I discuss ARP in more detail later in tHe section titled Address Resolution Protocol. EtHernet relies on a protocol called Carrier Sense Multiple Access witH Collision Detect CSMA CD . To simplify tHe process a device cHecks tHe network cable to see if anytHing is currently being sent. If it is clear tHe device sends its data. If tHe cable is busy carrier detect tHe device waits for it to clear. If two devices transmit at tHe same time a collision tHe devices know because of tHeir constant comparison of tHe cable traffic to tHe data in tHe sending buffer. If a collision occurs tHe devices wait a random amount of time before trying again. The Internet

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