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When a new router comes out of the box, it s not good for very much You need to somehow plug into that shiny new router and start telling it what you want to do There are a number of different methods, but one of the oldest (yet still very common) ways is using a special serial connection This type of connection is almost completely unique to Cisco-brand routers, but Cisco s massive market share makes understanding this type of connection a requirement for anyone who wants to know how to configure routers Figure 8-39 shows the classic Cisco console cable, more commonly called a rollover or Yost cable

Now take a look at the integral in the second term This is nothing other than the Laplace transform of f (t ) So, we nd that

Hubs still have their place in the Ethernet network True, it's only a matter of time before they are eclipsed by a new breed of low-cost switches However, until the cost per port is equal, hubs will always be of use on the network The two primary areas in which hubs hold their own are the workgroup environment and the server room At the workgroup level, 10/100 hubs provide a low-cost way to get desktops on the network The setting may be a remote office with 10 users, two servers, and a small-office/home-office (SOHO) router, where 100 Mbps shared is more than adequate bandwidth It may be in a server room, where the high-volume servers all have dedicated 100 Mbps switch ports and a handful of low-volume servers; and miscellaneous administrative workstations share a single 100 Mbps switch port through, say, a FastHub 424M 10/100 It's always nice to have a few extra ports available, anyway, and a hub is the least expensive option The other bonus offered by a hub is that it can quickly be swapped out for a switch without much pain and suffering That said, let's take a look at the role of a hub in a workgroup and in a server room

NOTE The term Yost cable comes from its creator s name, Dave Yost For more information visit http://yostcom/computers/RJ45-serial

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At this point I need to add an important point: switches as well as routers often have some form of configuration interface Granted, there s nothing for you to configure on a basic switch, but in later chapters you ll discover a number of network features that more advanced switches need to be configured to use Both routers and these advanced switches are called managed devices While in this section I use the term router, it s important for you to appreciate that all routers and many better switches are all managed devices The techniques shown here work for both!

This workgroup scenario consists of a small 10-user segment with two file/print servers, one printer, and a small wide-area router connected back to headquarters This same setup could just as well be a small segment in a campus network, where the router is connected to the network backbone instead of a WAN We'll use two Cisco 1538 hubs The first one is a 1538M (with Management) and the second an unmanageable 1538 These two 1538 Series hubs will be stacked using the integrated stacking connectors and the stacking cable Our small office will have 16 ports enough to attach all our devices with a few open ports left over Since the 1538 is auto-sensing, we'll be able to connect the 10 Mbps workstations and printers, as well as the 100 Mbps servers, to the same stack A router serves as a connecting point from our network to a WAN link that connects to headquarters This network scenario is illustrated in Figure 7-17 It's a very compact configuration and can be installed into the smaller areas typical of small/remote offices available for network equipment

Now let s consider differentiation with respect to s That is: d d [ F( s)] = f (t ) e st dt ds ds The integration is with respect to t, so it seems fair enough that we can slide the derivative with respect to s on inside the integral This gives

When you first unwrap a new Cisco router, you plug the rollover cable into the console port on the router and a serial port on a PC, as shown in Figure 8-40 If you don t have a serial port, then buy a USB-to-serial adapter