![]() ![]() For PCI compliance, this should be set to as follows:Įxec-timeout 15 0 Encrypt Cisco Passwords The syntax for this command is exec-timeout. To force Cisco devices to automatically timeout if a session is left inactive, use the exec-timeout configuration under the appropriate line configuration. TgtPorts = str(options.tgtPort).split(‘, ’) Help=‘specify target port separated by comma’) Parser.add_option(‘-p’, dest=‘tgtPort’, type=‘string’, \ Parser.add_option(‘-H’, dest=‘tgtHost’, type=‘string’, \ Parser = optparse.OptionParser(‘usage%prog ’ \ T = Thread(target=connScan, args=(tgtHost, int(tgtPort))) Print “ Cannot resolve ‘%s’: Unknown host”%tgtHost Placing all other functions into the same script and adding some option parsing, we produce our final port scanner script. In our exception handling code, the keyword finally executes the following code before terminating the block. By utilizing this semaphore, we now ensure only one thread can print to the screen at any given point in time. If locked, we will have to wait until the thread holding the semaphore releases the lock. If open, the semaphore will grant us access to proceed and we will print to the screen. Notice that prior to printing an output, we grabbed a hold of the lock using screenLock.acquire(). A simple semaphore provides us a lock to prevent other threads from proceeding. In order to allow a function to have complete control of the screen, we will use a semaphore. If multiple threads print an output at the same time, it could appear garbled and out of order. Our function connScan() prints an output to the screen. While this provides us with a significant advantage in speed, it does present one disadvantage. Keep receiving data but waiting to send new data (can only send when it gets WAKE UP message) When receive SLEEP command (there can be data in the buffer but not transmitted) When no more data to send sends DONE message NEW DATA CMD sent by slave (need to wait for WAKE UP before sending new data) When there is new data to be transmitted. Till incoming data is being received and no outgoing data/message WAKE UP received from master and has data to send ![]() WAKE UP received from master and no data to send Longer sleep periods will result in longer lags in any interactive applications, while shorter sleep periods may not extend battery lifetime significantly. This timer determines the duration of communication suspension by the master. Shorter timeout periods will cause SLEEP earlier than desired causing poor response from applications, while longer timeout periods will cause the communication devices to remain active for unnecessarily longer time resulting in energy/power wastage. Sufficient care should be taken to ensure that the timeout periods are not too short or long. When the timer expires and no communication has occurred since the last expiration, the protocol concludes that there is an idle period in the communication. The timeout timer is set with a fixed period. The following are the timers that are needed in the application-based PM architecture. Input messages to the mobile device or base station are the incoming message/data or timeout and output messages are the outgoing messages/data. Idle timers detect idle time for both the mobile device master and the slave base station. The slave queues the data during nontransmit phases of protocol, while waiting for commands from the master mobile device. The mobile host is the master and the base station is slave, which as a slave is allowed to send data to the mobile device only during specific phases of the protocol. Periodically or by request from the application, the protocol wakes up and reinitiates communication with the base station. The protocol described later allows a mobile device host to suspend a wireless communication device. There would be suspend–resume cycles resulting in bursts of data/communication followed by idle/inactivity. When the mobile device wakes up, it will send a query to base station to check if it has any data to send. ![]() In communication-based PM, the mobile device would act as master and would tell the base station when data transmission can occur. In a mobile device, a wireless Ethernet card would be in receive mode when not in use. Gajjar, in Mobile Sensors and Context-Aware Computing, 2017 Concept of communication-based power management ![]()
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