ccna pdf todd lammle

ccna pdf todd lammle

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(6) Use Proxy : Use a proxy to prevent others from discovering your real IP . If you want to use a proxy, select the check box, click the Define button, and set the proxy's IP and port. If you want a user name and password, enter it, otherwise don't enter it. No proxy is used here. (7) Various viruses, worms, and backdoor technologies are becoming more and more intelligent, and are showing a trend of integration, forming a mixed threat. (1) Do not use pirated or unknown software, especially pirated anti-virus software. After the city receives the key system provided by the service center, the city independently issues the leadership card, and uses the city master key card and transmission card to issue user cards, operator cards and ISAM cards, and uses PSAM mother cards and transmission cards to issue PSAM cards . (6) Use Proxy : Use a proxy to prevent others from discovering your real IP . If you want to use a proxy, select the check box, click the Define button, and set the proxy's IP and port. If you want a user name and password, enter it, otherwise don't enter it. No proxy is used here. This kind of firewall can completely control the exchange of network information and control the session process, and has flexibility and security, but it may affect the performance of the network and is opaque to users. For each type of server, a proxy module must be designed to establish a corresponding gateway. Layer is more complicated to implement. (3) ip address command. (2) The reception cannot be denied, so that the recipient of the information cannot deny the received information. (4) The newly purchased computer should be checked for viruses before use to prevent the machine from being infected. Hours of service in the new district. CGI (Common Gateway Interface) is a common gateway interface. It is with the server Web server with another engagement, in response to interactive requests the remote user. It allows the user to select a language, such as C / C ++ , VB and other programming, provide for the capability information exchange between the server and the remote browser. 7.3 Commonly used hacking methods 6.4.1 Destructive behavior of computer viruses 5.5 Steps to create a firewall Practice has shown that filtering router firewalls are the simplest security precautions. Dual-hosted host firewalls are in the middle. Host filtering firewalls and subnet filtering firewalls are ideal. Strap-type firewalls are the best, but generally in small and medium-sized enterprises. The network is not widely used. static(inside , outside)204.31.17.129 192.168.3.1 conduit permit tcp host 204.31.17.129 eq www any static(inside ,ccna pdf todd lammle, outside)204.31.17.129 192.168.3.2 conduit permit tcp host 204.31.17.129 eq smtp any static(inside , outside) 204.31.17.129 192.168.3.3 conduit permit tcp host 204.31.17.129 eq ftp any Using the parameter network (DMZ) to isolate the bastion host from the internal network can reduce the destructive power brought to the internal network by the intruder after breaking through the bastion host. Even if the intruder rushes through the bastion host, he cannot perform arbitrary operations on the internal network, but can only perform partial operations. Although the virus is not directly destructive to data, under NT , Win32/Funlove.4099 virus is also The key exchange method specifies how to use a shared symmetric key in the data transmission between the client and the server. The direct economic loss of the computer system reached 96 million US dollars. The designer of this virus is Robert Morris (Robert TCP , but its efficiency is higher than TCP , it is more suitable for remote screen monitoring. It does not distinguish between the server and the client, only the sender and the receiver. The programming is relatively simple, so the UDP protocol is used . (3) Restrict visitors from leaving a strictly controlled point. snmp-server community public telnet 10.0.0.100 255.255.255.255 1) Discovery and removal of shock wave virus 2. The digital signature mechanism (Digital Signature Mechanisms) (1) Target: There are many hosts on the network, and the hacker must first find the site he is looking for. Of course, to really identify the master machine that IP address, hackers use domain names and IP addresses can successfully find the target host. (3) The role for the merchant supplier is: ① Use the private key to decrypt the order and payment notice; ② Use the purchaser's public key to issue the payment notice and the agent bank public key. ① HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run\Kernel (1) The client has only internal network IP , but no public network IP . The computer system security assessment standard is a technical regulation. In the special field of information security, if there is no such standard, the related legislation and law enforcement will be biased, which will eventually bring serious consequences to the country’s information security. As the security evaluation of information security products and systems is related to the national security interests, many countries are actively formulating their own computer security evaluation and certification standards on the premise of fully learning from international standards.

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