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As you recall, CiscoWorks uses SNMP for all connections to remote devices Therefore, you need to have at least the read-only SNMP community string for each device you want to view If you intend to alter the device's configuration, you'll need the read/write community string The other crucial piece of information you'll need is the IP number or host name (if the devices are registered with a name service) If you don't have any of this information or it is incorrect, you won't get connected to the device and will see an annoying error message instead To connect to a device, follow these steps: 1Click on File | Open Device 2Enter the IP number or host name of the device, and at least one of the SNMP community strings Click OK, and CiscoView will attempt to make a connection with the device If all goes well, you'll see a graphical representation of the device, as illustrated in Figure 8-6 for a Cisco 4500 router In this example, we are viewing the rear panel of the router Three modules are currently installed in it: a 4-port ISDN module, a 2-port Token Ring module, and a single-port Ethernet module When CiscoWorks calls up a device in this fashion, it color-codes each physical port so that you can instantly see which ports are active

Note that r > 0 and that we have tan = y / x as a means to convert between polar and Cartesian representations

Figure 11-4

Figure 8-6: CiscoView displays actual hardware configurations This initial image of the device is obviously quite useful, but CiscoView's features go beyond this

The granddaddy of all TCP/IP symmetric-key algorithms is the Data Encryption Standard (DES) DES was developed by the United States government in the late 1970s and was in widespread use in a variety of TCP/IP applications DES used a 64-bit block and a 56-bit key Over time, the 56-bit key made DES susceptible to brute-force attacks

The value of for a given complex number is called the argument of z or arg z The principal value of arg z which is denoted by Arg z is the value < The following relationship holds: arg z = Arg z + 2 n n = 0, 1, 2, (134)

In terms of basic configuration, what you can specifically manipulate depends on the device To configure global features of the device, double-click on a port; or click a port to highlight it and select Configure | Port This brings up a window like the one in Figure 8-7

The computing world came up with a number of derivatives of DES to try to address this issue, with names such as 3DES, International Data Encryption Algorithm (IDEA), and Blowfish On the streaming side the only symmetric-key algorithm you ll probably ever see is Rivest Cipher 4 (RC4) stream cipher RC4 was invented in the late 1980s by Ron Rivest, cryptographer and arguably the most famous of all inventors of TCP/IP security algorithms RC4 is used in a number of TCP/IP applications Over the years improvements in computing power made both DES and RC4 vulnerable to attacks in certain circumstances As a result almost all TCP/IP applications have moved to Advanced Encryption Standard (AES) AES is a block cipher, created in the late 1990s It uses a 128-bit block size and 128-, 192-, or 256-bit key size AES is incredibly secure, practically uncrackable (for now at least), and is so fast that even applications that traditionally used stream ciphers are switching to AES Not at all limited to just TCP/IP, you ll find AES used from file encryption to wireless networking to some Web sites Given that AES is still somewhat new, many TCP/IP applications are still in the process of moving toward adoption EXAM TIP When in doubt on a question about encryption algorithms, always pick AES You ll be right most of the time