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As with other Cisco network devices, your initial means of connecting to a switch is through the console port After this initial connection and configuration, you have three options for connecting to a switch: via the console port, via Telnet, and via the browser-style Visual Switch Manager software The initial connection, and configuration through the console port and with Telnet, are discussed in the following paragraphs Configuration using Visual Switch Manager software is discussed in more detail in a later section

Now delete one of the entries in the ARP table with the command:

One of the most powerful applications of the residue theorem is in the evaluation of de nite integrals of functions of a real variable We start by considering

arp d [ip address from the previous results]

Included with the purchase of a switch is a rollover cable Connect one side of this RJ45 cable into the console port The other side goes into an adapter, either an RJ-45 to DB-9 female DTE adapter, or an RJ-45 to DB-25 adapter Your terminal emulation software needs to communicate with the switch using hardware flow control The terminal type should be set to VT100 Several terminal software applications are available, including the Hyperterminal program that is included with Windows 9x and NT 40 Hyperterminal and most of the other terminal programs provide an easy path to the console port The following configuration supports a serial connection to the switch's console port: Baud rate Data bits Stop bits Parity Flow control Terminal type 9600 8 1 None None VT100

Run the arp a command again The line for the address you specified should be gone Now try and PING the address you deleted and check the ARP table again Is the deleted address back Whenever a computer wants to send to an IP address on another LAN, it knows to send the packet to the default gateway It still sends out an ARP, but this time to the default gateway (Figure 7-21) Once Computer A gets the default gateway s MAC address, it then begins to send packets

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Configure the terminal emulator using these parameters and then, if you haven't already done so, power up the switch Press Enter a couple of times until you see a prompt The first time you boot up the switch, you'll be prompted for IP information Although this information is not required for the switch to work, it is necessary to allow connectivity through a Telnet session or Visual Switch Manager software The initial IP information can only be configured using the console port This is also a good time to set your passwords for the switch, and change the default SNMP community strings (even though these configurations can be done through a Telnet session or Visual Switch Manager) If you decide against using the software prompts during the initial powering of the switch or if you want to change these configurations, you can use the CLI The following procedure describes how to change the IP information for the 2900 Series switches using the CLI (this process is similar across the majority of switches):

Subnet masks are represented in dotted decimal just like IP addresses just remember that both are really 32-bit binary numbers All of the following (shown in both binary and dotted decimal formats) can be subnet masks: 11111111111111111111111100000000 = 2552552550 11111111111111110000000000000000 = 25525500 11111111000000000000000000000000 = 255000 Most network folks represent subnet masks using special shorthand: a / character followed by a number equal to the number of ones in the subnet mask Here are a few examples: 11111111111111111111111100000000 = /24 (24 ones) 11111111111111110000000000000000 = /16 (16 ones) 11111111000000000000000000000000 = /8 (8 ones) An IP address followed by the / and number tells you the IP address and the subnet mask in one statement For example, 2012345123/24 is an IP address of 2012345123, with a subnet mask of 2552552550 Similarly, 184222436/16 is an IP address of 184222436, with a subnet mask of 25525500 Fortunately, computers do all of this subnet filtering automatically Network administrators need only to enter the correct IP address and subnet mask when they first set up their systems, and the rest happens without any human intervention NOTE By definition, all computers on the same network will have the same subnet mask and network ID

Now, write the complex variable z in polar form on the unit circle, that is, let z = ei Notice that dz = iei d d = i 1 dz = dz z iz