ccna top books

ccna top books.Router interface nomenclatureDepending on the Cisco router product, interfaces may be fixed or modular, or both. On Cisco routers, the interface number for a particular interface type always starts at 0, unlike switches, which start at 1. Unlike switches, routers support many different media types, and the exact types supported depend on the model. These types include: atm, asynch.bri, ethernet, fastethernet, gigabitethernet, serial, and so on.For routers that have only fixed interfaces, the interface nomenclature is typeport_#. For example, if the router has two fixed Ethernet interfaces and two fixed serial interfaces, they will be named ethernet0, ethernet 1 serial 0, and serial 1, respectivelyAs you can see from this example, in each interface type, the port numbers start at 0. By using the interface type and number, the individual interfaces can be uniquely identified.However, if the router has modular slots into which interface cards can be inserted, the interface nomenclature would be similar to that of a Catalyst switch: type slot_#/ port_#o slot numbers start at 0. Each slot has a different slot number, and in each slot, the port number starts at 0. For example, if the modular router contains two slots, the first slot will be numbered 0,and the second 1. If there are 4 serial interfaces in the first slot, these interfaces will be numbered. .3; if there are two Ethernet interfaces in the second slot, these interfaces will be numbered 0 and 1.On the 3940 router, the interface numbers for the four-port serial module in the third slot are as follows: serial 2/0, serial 2/1, serial 2/2, and serial2/3. Routers that contain modular interfaces include the 1900, 2900, 3900, 7300, and 7600oThe nomenclature for router interfaces is typeslot_#/port_# or type port#. Where type is the media type, such as atm,asynch, bri, gigabitethernetxserial, and so on. For modular routers, the slot number is next; slot numbers start at 0start. In the same slot and of the same type, the port number starts at 0, unlike Catalyst switches.10.1.2 The Device Boot Process