new ccna study guide pdf

new ccna study guide pdf

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(3) Web server support module (Web Server the Component) . Taking email as an example, digital certificates can solve the following problems: Access control rules deal with the legality of the subject's access authority to the object. A subject can only access a given object that is authorized to use. Otherwise, the audit trail system of the access control mechanism will automatically deny access and provide follow-up audit information for event reports. While web services facilitate users to publish information, they also bring insecurity to users. Especially in the Standards Association proposed extension on the basis of certain services, while providing interactive information to the user, but also makes the Web the foundation has added a new insecurity. (10) the top- SAM key distribution result on the card as a prepaid card master card transmission SAM application card maintenance key, and then recharge SAM directly derived key ciphertext card into the prepaid card master SAM card, dispersion codes The last 8 bytes of reset information for the recharge SAM card . A program is usually divided into three parts : program segment, data segment and stack in memory . Block machine placed in the program code and read-only data. The data segment stores static data in the program, and the stack stores dynamic data. In memory, the position thereof is set as shown in FIG 7.1 FIG. Cisco hardware firewall configuration and management (1) using the encryption key PK plaintext X encrypted, then the decryption key SK to decrypt plaintext can be recovered, or written: the DSK (EPK (X)) = X . It is an important method for hackers to obtain the password of the system administrator through cracking, and then to control the server. There are many ways to crack the administrator password,new ccna study guide pdf, the following are the 3 most common methods. ATTRIB -h -s -r Explorer.exe Del Explorer.exe 255.255.255.224 7.4.1 Network monitoring example DES is an algorithm for encrypting binary data. The data packet length is 64 bits, and the ciphertext packet length is also 4) Unmodifiable information 1. Completeness (2) The startup process of the Cisco PIX 515 firewall. Suppose the network 123.45.0.0/16 does not want other Internet hosts to visit its site; but one of its subnets 123.45.6.0/24 has a cooperative project with a university 135.79.0.0/16 , so the university is allowed to access the subnet; however, 135.79 .99.0 / 24 is a black passenger heaven shall be prohibited, setting the table for this purpose on the network firewall 5 - 2 rules shown. As an important part of information security, the security protocol formal method of analysis began in the 20 century 80 early years, currently (1) Understand the role of CA certification through the Internet . For port scanning, this technique uses the PORT command to indicate that the passive User DTP is listening on a port on the target computer . Then the intruder tried to list the current directory with the LIST command, and the result was sent out via Server-DTP . If the target host is listening on a port, the transmission will succeed ( resulting in a 150 or 226 response ) . No it, there will be 425 of Can not Build the Data Connection : Connection refused The . Then, use another PORT command to try the next port on the target computer. The advantage of this approach is obvious: it is difficult to track, you can pass through the anti- firewall. The main disadvantage is that the speed is very slow, and some FTP servers can eventually get some clues and turn off the proxy function.

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Latest Cisco CCNA 200-301 Dumps

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