ccna wireless book pdf

ccna wireless book pdf

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8) Covert channel analysis 5) How to protect the certificate 1994 year-end, the Russian hacker Vladimir · Leven together with friends in a small software company in St. Petersburg networked computers, carried out a series of vicious attacks on the United States of America, Citibank, electronic transfer mode, Citibank in New York from the host computer in about $ 1.8 million was stolen . In a general sense, if a computer system is safe, it means that the system can control external access to system information. In other words, only authorized users or processes running on behalf of that user can read, write, create, or delete information. In the TCP/IP protocol standard, a three-way handshake between the client and the server is required to complete a TCP connection. First,ccna wireless book pdf, the client has sent a SYN flag service request packet to the server, and the server returns a SYN + 1 of the ACK response packet, and then send the client receives an acknowledgment packet to the server. At this time, the client has successfully established a connection with the server, so that preparations are made for future communication. But an attack, an attacker using a fake IP address sent only dummy made without receiving a response packet, the server so that a large number of "half-open connection", since each packet has a certain waiting server response time, and when If no response is received for a certain period of time, it will be retransmitted many times. Therefore, the server forms a large number of half-open connections during the retransmission and waiting process. In this way an attacker can send a large number of false by multiple computers IP source address of the SYN packet, causing the server CPU occupancy excessive, when a certain amount, to form a denial of service. At the same time, since most of the requests of legitimate users are overwhelmed by the attack package, even if the server does not crash at this time, it is unable to respond to the request.

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Latest Cisco CCNA 200-301 Dumps

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