Learning by Doing: CISCO Certified Network ... - SCN Research

Figure 1—CISCO 2501 router “front” view.
Nothing fancy here…personally I consider this to be the “rear” of the router since I do all
of my work on the other side. So let’s take a look at the CISCO-termed “rear” of the
2500 router.
(AUI port Serial Console Power Power
requires Ports Aux Switch Plug
transceiver)
Figure 2—CISCO 2501 router “rear” view, dual serial, single AUX.
AUI ports Serial Console Power Power
(requires Ports Aux Switch Plug
transceivers)
Figure 3—CISCO 2514 router “rear” view, dual serial, dual AUX.
The 2600’s, on the other hand, are more “modular” in style. From figures 4 and 5 we can
see some removable plates/covers. This is where a variety of modules can be inserted.
The two smaller plates can have WAN Interface Cards (WIC’s) inserted. These are
things like dual serial interfaces, ISDN modules and T-1 modules. The larger removable
plate/cover is for, well, larger modules with many Ethernet, serial interfaces or even
multiple ISDN interfaces. We are talking up to 24 or so lines. A far cry from those
2500’s huh? Different routers can use different modules so check your documentation
carefully.
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