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Usually there will be several users of the CW system, which allows different usernames to be assigned their own passwords and appropriate user privileges To set up the CW system, the internetwork either is searched automatically or devices are added manually If devices are found automatically, it is done by IP address and you will want to modify the device type to be the specific Cisco router in use Once you are satisfied that you have collected all the information, you will synchronize the CW Sybase database with the management system's database that you have installed The main benefits of CW are the ability to poll devices and receive traps to generate alerts for operators, and to simplify configuration changes through the Snap-In Manager tool, which allows you to set configuration changes for multiple routers on your network The CW station can be used as the TFTP server for auto-install procedures and to retrieve remote router configurations on a regular basis for backup purposes CW notifies an operator of a network event such as a polled device becoming unreachable, or an interface going down on a router enabled to send traps by the color of the device's display changing from green to red An alert box appears on the screen and, optionally, audio alarms can be set off It must be noted that running a CW system efficiently is not a trivial task; it requires substantial knowledge of the underlying management platform and the operating system on which it is running Router Software Management with CiscoWorks We have discussed using a TFTP server to store and download router configuration files, particularly for the auto-install procedure Using plain TFTP will simplify things for you; some CiscoWorks applications will assist you even further CW comes as a set of applications, the most useful of which we will overview here The CW Configuration Management application allows you to edit, upload, and download Cisco router configuration files In general, the process involves creating a file by using a text editor, then executing the filetodatabase command in the configuration management window, followed by the databasetodevice command This ensures that the Sybase database on the CW computer holds the most recent copy of the device's configuration The Configuration Management application has another feature that is sometimes useful in troubleshooting because it allows you to compare two configuration files and identify differences between the two This can help in determining whether configuration changes made to a router have caused an internetwork problem This is of value only if you have configurations for both before and after the internetwork problem started Some users of CW systems perform an overnight backup of all router configurations, just for this purpose The Device Software Manager application simplifies the procedure for upgrading IOS or microcode remotely This application actually consists of three applications: the Software Library Manager, to maintain and list the sources of software available; the Software Inventory Manager, to list current software status and sort device information according to platform and software image; and the Device Software Manager, to automatically upgrade the system software on a selected router This software automatically performs all the tasks detailed in the section on remotely upgrading IOS from a TFTP server, which is covered in detail in the next section.

12:

in an additional work location, known as a site, in case the original office building becomes unavailable because of fire, flood, or an extended power outage When deciding on an alternative location, or site, to continue business operations in the event of a failure, you must choose among a hot site, a warm site, and a cold site Each site type is explained as follows:

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A hot site is an alternative location that provides adequate space, networking hardware, and networking software for you to maintain business operations if disaster strikes This hardware and software should include any data that would be needed by your staff in the event of a disaster, so the provider of the hot site should ensure that the data is up-to-date and the hot site is ready 24/7 if your organization needs it A cold site is an alternative location where you typically have arranged to have the space available but not the networking hardware or networking software Providing the hardware and software would be your responsibility in the event of a disaster A cold site takes time to prepare following a disaster because only the space is made available A warm site occupies the middle ground between a hot site and a cold site It is an alternative location with office space and spare networking equipment, such as a server and backup devices, so that you can quickly restore your organization s network in an emergency

Global Command Manager allows you to automate the running CW applications such as upgrading devices or sending common configuration changes to routers The application's concept is the same as that of the Unix cron utility Any Unix or CW command that you can specify manually can be automated to execute at a specified time The Global Command Manager can be used to schedule database tasks such as backups and purge of log files, device polling to retrieve MIB variable information, and use of the Configuration Snap-In Manager For a command to be executed by this application, it must be created as a global command, which will add it to a log file of commands to be executed at the specified time The Configuration Snap-In Manager allows a common set of configuration commands to be sent to a set of devices To use this application, define a set of commands as a snap-in, which can be applied to a defined set of devices Snap-in commands must be of the same type; for example, you can send three snmp-server commands in one set, but you can't send an snmp-server and a logging buffered command in one set The most useful things you can do with this application are to globally change the Enable password on your router configuration, and change security management station configurations such as access lists or source addresses

There are number of concepts that can be applied to your network to help secure the company and its data This section is intended to provide a best practice guide to guarding your corporate investments Although it is not designed to be a complete list, this section outlines common practices that should be followed to help create a more secure infrastructure One of the most important things to understand about network security is that you should take a layered approach to securing network data In other words, don t focus too much on just one area of protection but implement all layers of protection

program using the transport layer protocol In other words, if the user program is quiescent and is waiting for requests, the program is designed to look for a specific port number, such as 21 for a destination port, when FTP is used For user programs that originate traffic, such programs commonly use random port numbers for the source port For example, when you first open FTP to transfer a file port number 1234 might be used as the source port number while later in the day, when you open an FTP application to transmit another file source port number 2048 might be used For all FTP usage, however, the destination port would be fixed at 21, which is the standardized port number for an FTP server When the server responds, the server will place the source port number in the destination port field which enables the file originator to correctly identify the response to its datagram As we will note later in this section, each datagram has a sequence number which enables the opposite end of the transmission to ensure that datagrams are received in their correct order and that none are lost The term Well-Known Port, which is commonly used to denote an application layer protocol or process, actually references a port address at or below 1023 Both TCP and UDP headers contain fields for identifying source and destination ports Telnet, for example, which is transported by TCP, uses the Well-Known Port number 23, while SNMP, which is transported by UDP, uses the Well-Known Port number 161

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