ccna 200-301 official cert

ccna 200-301 official cert.The login block-forlogin quiet-mode access-class and login delay commands can help block failed logins for a limited period of time but do not prevent an attacker from trying again. How does an administrator know that someone has gained access to the network by guessing a password?2.1.3.4 Logging Failed Attempts32 Chapter 2 Protecting Network Devices3 commands can be configured to help administrators detect password attacks. Each password enables the device to generate syslog messages in response to successful or failed login attempts.The first two commands login on-success and login on-failure generate syslog messages in response to failed login requests and successful login requests. The number of login attempts before the log message is generated can be specified with the [everylogin] parameter, which defaults to 1 and takes the value 1.65535.An equivalent command to the login on-failure command is security authentication failure rate, which is configured to generate a log message when the number of failed login attempts is exceeded. To verify the setting of the login block-for command and the current mode, use the show login command. Whether the router is in normal mode or silent mode depends on whether the login threshold is exceeded. The show loginfailures command displays more information about the failed attempts, such as the IP address that initiated the failed login attempt.2.1.3.5 Providing legal noticesUse flag (banner) messages to display a legal notice to potential intruders that they are not welcome on the network. From a legal perspective, flag messages are very important. When intruders enter a network without proper warning, they may win a lawsuit. In addition to warning intruders, flagging messages can also be used to inform remote administrators of usage restrictions. The choice of what to place in the flag message is also important and should be checked by legal counsel before being placed on the router. Never use "Welcome" or other familiar greetings that could be misinterpreted as an invitation to use the network. Flagging messages are disabled by default and must be explicitly enabled. The banner command can be used in global configuration mode to set the correct message. In addition to the common Message of the Day (MOTD), banner tokens can also be created for other login methods after entering privileged EXEC mode. Command tokens (token) are optional and can be used in the message portion of the banner command.S(hostname)------ displays the hostname of the router.$(domain)----- displays the domain name of the router.