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Computers, as you know, don t speak analog only digital (ones and zeroes) will do In addition, the people who invented the way PCs communicate decided to divide any digital signal going in and out of your computer into 8 bits at a time To connect over phone lines, they need two devices: one that converts this 8-bit wide (parallel) digital signal from the computer into serial (1-bit wide) digital data, and then another device to convert (modulate) the data into analog waveforms that can travel across PSTN lines You already know that the device that converts the analog data to digital and back is called a modulator-demodulator (modem) The modem in your PC (assuming you still have one) also contains a device called a Universal Asynchronous Receiver/Transmitter (UART) The UART takes the 8-bit-wide digital data and converts it into 1-bitwide digital data and hands it to the modem for conversion to analog data The process is reversed for incoming data Even though internal modems are actually both a UART and a modem, we just say the word modem (Figure 14-20)

Although Cisco IOS offers TCP Intercept to prevent SYN-flooding attacks, Cisco Firewall IOS takes it a step farther and provides the following attack detections: Compares the rate of requests for new connections, and the number of half-open connections, to a configurable threshold level If the threshold is exceeded, an alert message is issued and other configured actions can be performed Monitors TCP connections and packet sequence numbers If the sequence numbers are not within an expected range, the suspicious packets are dropped In addition, Cisco Firewall IOS provides the following attack prevention: Drops old, half-open TCP connections if a configurable, maximum threshold is exceeded Blocks all SYN packets from the host under attack, until expiration of the (configurable) automatic timeout period

Using Eq (127), we can obtain the Green s function for the quarter plane 0 < x < , 0 < y < by using the map w = z 2 After some algebra you can show that G (z , z0 ) = z2 z 2 1 ln 2 0 2 2 z z0

NOTE Internal modems are both a UART and a modem External modems use a serial or USB port The serial or USB port contains the UART and the external modem truly is just a modem

Cisco Firewall IOS can be configured to send syslog messages to a central management console upon detecting suspicious activity This feature includes capability to Generate automatic alerts when attack prevention is enabled Configure the types of alerts to be sent via the syslog management tool Send alerts for DoS attacks, SMTP command attacks, or denied Java applets

2 2 ( x x 0 )2 + ( y y0 )}{( x + x 0 )2 + ( y + y0 ) 1 = ln 2 2 4 ( x x 0 )2 + ( y + y0 )}{( x + x 0 )2 + ( y y0 )

Modems use phone lines to transmit data at various speeds These speeds cause a world of confusion and problems for computer people This is where a little bit of knowledge becomes dangerous Standard modems you can buy for your home computer normally transmit data at speeds up to 56 Kbps That s 56 kilobits per second, not 56 kilobaud! Many people confuse the terms baud and bits per second This confusion arises because the baud rate and bits per second are the same for modems until the data transfer rate surpasses 2400 bps A PSTN phone line takes analog samples of sound 2400 times a second This standard was determined a long time ago as an acceptable rate for sending voice traffic over phone lines Although 2400-baud analog signals are in fact fine for voice communication, they are a big problem for computers trying to send data because computers only work with digital signals The job of the modem is to take the digital signals it receives from the computer and send them out over the phone line in an analog form, using the baud cycles from the phone system A 2400-bps modem often erroneously called a 2400-baud modem uses 1 analog baud to send 1 bit of data As technology progressed, modems became faster and faster To get past the 2400baud limit, modems would modulate the 2400-baud signal multiple times in each cycle

This section describes the benefits of Cisco Firewall IOS NoteIt is important to determine your security requirements with care Make sure that the Cisco Firewall IOS satisfies these requirements If not, a dedicated firewall may be more appropriate

A 4800-bps modem modulated 2 bits per baud, thereby transmitting 4800 bps All PSTN modem speeds are always a multiple of 2400, with the latest (and last) generation of modems achieving 2400 24 = 57,600 bps (56 Kbps)

Finally, the Green s function for the unit disk (with singularity z0 inside the unit disk) is given by G (z , z0 ) = z z0 1 ln 2 1 z0 z (128)