ccna 01

ccna 01

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(1) The basic composition and functions of the Cisco PIX 515 firewall. route command parameters / options Table 5 - 3 Rule number two netmask global_mask (2) The firewall should be able to resist attacks from network hackers, and can monitor and audit network communications. Such a network node is called a blocking point. (9) Pay attention to various abnormal phenomena of the computer at any time ( such as slowing down, strange files popping up, and file size changes (4) Connections : The number of threads, here depends on the network speed, the default is fine. If the digital set is too large,ccna 01, the numbers will show yellow or red, it will affect the results. Therefore, it is recommended not to make the numbers yellow or red. ( Such as access control lists ) allows the user to user name and ( or ) the identity of the user group requirements and control of the shared object; prevent non- authorized users to read sensitive information, and control access proliferation. The autonomous access control mechanism only allows authorized users to specify access to objects based on the users specified by the user . (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 . 3. Consolidate control (3) The last step the hacker needs to do is to issue commands to attack specific targets from the attack console to each attack server . Since the location of the attack console is very flexible and the time for issuing commands is very short, it is very hidden and difficult to locate. Once the command is transmitted to the server, the console can be shut down or disconnected from the network to avoid tracking. Then, the attack server issues commands to each attacker. After the attacker receives the command, each attacker starts to send a large amount of service request data to the target host. These packets disguised has been unable to identify the source, and these data packets, please request the service tend to consume more system resources such as CPU resources or network bandwidth. If hundreds or even thousands of attack hit simultaneously invade a target, it will lead to depletion of the target server network and system resources to stop the service, in severe cases can cause the system to crash. In addition, this can also block network equipment such as firewalls and routers of the target network, further aggravating the network congestion, and finally make the attacked server unable to provide users with any services. Because the protocol used by hackers are some of the common protocols and services, the system administrator is difficult to distinguish between normal connection or malicious requests, please seek, and thus can not effectively separate the invasion of packets.

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