I finished reading through the theory and started jumping into labs (specifically "101 Labs - Cisco CCNA" on Kindle Unlimited). I don't understand implementing serial connections. I have a few questions that I'm having trouble finding answers too,
What routers are the best to use to emulate the average router? I've been using a 2901 w/ the HWIC-2T module which seems to be working.
How can I control what the serial X/Y/Z numbers are? I don't know what X determines. Y seems to be based on the module location and Z seems to be determined based on the port on the module.
Lastly what are the differences between DTE and DCE serial connections? It seem one side should be a DCE connection and one side should be a DTE connection, so how can the wire be DTE or DCE?
Connecting routers with serial cables in packet tracer?
Cant use DCE or DTE cable on Cisco 1941 router (packet tracer)
cisco - Routing Serial cables instead of Ethernet - Network Engineering Stack Exchange
cisco - What's the difference between Serial DCE and Serial DTE link? - Network Engineering Stack Exchange
What equipment do I need to connect to the Cisco Router console?
How do I plug into the Router console?
What settings do I need in the terminal software?
Videos
I have a lab for homework where i have to use a serial cable, DCE or DTE im not sure. The teacher went over it and it looked like he added a module to the back right side and then it would work.
im tring that on both the left and right side and it still dosent work. I watched youtube videos where the guy did the same thing and it worked for him no problem. i tried 2 different versions of pacet tracer too.
One of the jobs of a router is to connect networks that have physically different transmission media. 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.
For historical reasons, serial cables such as HSSI may be used to connect equipment such as T1/T3 terminating devices. These will show up as interface SerialN, and you can get detailed information on the hardware installed in a router with show controllers serial.
Unfortunately, "DCE/DTE" technically applies to a number of different hardware signaling schemes. In the context of networking, it's most likely to refer to a serial interface that's used to connect to a WAN drop.
In the case of your simulator, you should practice with both types of interfaces. In most business networks, the "inside" interfaces will be Ethernet, while the WAN interface will be either serial or Ethernet depending on what service the telco is providing, and you'll need to be able to configure either one.
For the sake of completeness: Serial links are not solely used for gateway-WAN connections.
For instance, there are companies which host your network equipment and link your device via serial link to their infrastructure. Although your device is online with a public address, it still is not a DTE-like topology.
Another even more LAN-related serial link may be used on a daily basis by yourself and your colleagues: USB. Since USB does not only connect an end device to a storage device, but is also hosts to networks. An example for a host-to-LAN connection would be a tablet user currently being dislocated from a WAP. Because tablets usually do not have an Ethernet interface, a work-around is necessary. An example for a host-to-WAN connection would be field personnel accessing mobile broadband services via a pluggable antenna.
One side of the link (DCE), has to transmit the clock signal, which controls the data rate, and the other side (DTE) receives the clock signal.
R1 is DCE here:
interface Serial0/0/0
ip address 10.0.0.1 255.255.255.252
clock rate 2000000
R2 is DTE here:
interface Serial0/0/0
ip address 10.0.0.2 255.255.255.252
The difference between the two cables in packet tracer is just which side you click first:
- With the DCE cable, (red zigzag with clock) the side you click first will be the DCE, the second will be DTE
- With the DTE cable (red zigzag no clock) the side you click first will be DTE, the second will be DCE
Whichever way you do it, you'll see one side of the cable shows the clock symbol: this is the DCE.
DCE stands for data circuit-terminating, data communications, or data carrier equipment - this is a modem or more generally, a line adapter.
DTE stands for data terminal equipment which generally is a terminal or a computer.
Basically, these two are the different ends of a serial line.