In the case of your simulator, you should practice with both types of interfaces. In the context of networking, it's most likely to refer to a serial interface that's used to connect to a WAN drop. Unfortunately, "DCE/DTE" technically applies to a number of different hardware signaling schemes. These will show up as interface SerialN, and you can get detailed information on the hardware installed in a router with show controllers serial. Twisted-pair Ethernet is extremely common these days, but fiber (Ethernet, SONET/OC, and others) is used for most high-speed or long-distance runs, and different types of layer-2 and layer-1 networks have been used in the past and are still in use today, such as T1/T3 lines, ISDN, and Token Ring.įor historical reasons, serial cables such as HSSI may be used to connect equipment such as T1/T3 terminating devices. One of the jobs of a router is to connect networks that have physically different transmission media.
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