ccna 1 chapter 4

ccna 1 chapter 4

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Data unit integrity: The sending entity marks and identifies the data unit as the information signature function of the data itself ( commonly used Hash function, etc. ) . The receiving entity predetermined comparison authentication mark data to the reception result of discrimination is NO true. The route command defines a static route for the interface. Route command statement may have a specific destination, or can generate a static default route. Table . 5 - 13 is described with route options and parameters of the command, the specific command syntax is shown below. London · Ed Lehmann (Len Adleman) named it as a computer virus (Computer viruses) , and formally proposed at the weekly computer security seminar, 8 experts after hours VAX11 / 750 running on a computer system,ccna 1 chapter 4, the first Yi virus experiment is successful, a week later approved for 5 demo experiments to verify the existence of computer viruses on the experiment. ② For CuteFTP client: execute Edit → Setting → Connection → Firewall command, select PASV Mode ; or execute File → Site Manager command, select the site on the left, execute Edit command, and select Use PASV mode . For example: the method of using random numbers only increases the difficulty of these analyses, but it seriously increases the time of encryption and decryption, and these analysis techniques can also decipher this method of using random numbers. The server is used as a puppet machine. In the TCP/IP protocol standard, a three-way handshake between the client and the server is required to complete a TCP connection. First, 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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