Network Cabling for the CCENT Certification Exam
The CCENT certification tests you on the different types of cabling that are used in different scenarios. The following are some key points to remember about network cabling.
Rollover cable: A rollover cable is also known as a console cable and gets the name rollover because the order of the wires from one end of the cable to the other are totally reversed, or rolled over. The rollover/console cable is used to connect a computer to the console port or auxiliary port of the router for administration purposes.
Back-to-back serial cable: The back-to-back serial cable is used to connect two Cisco routers directly together over a serial link. A back-to-back serial link will have one router act as the DCE device with the clock rate set and the other router act as the DTE device.
Straight-through cable: A straight-through cable is used to connect dissimilar devices together. Scenarios that use straight-through cables are computer-to-switch and switch-to-router.
Crossover cable: A crossover cable has wires 1 and 2 switch positions with wires 3 and 6 on one end and is used to connect similar devices together. Scenarios that use crossover cables are computer-to-computer, switch-to-switch, and computer-to-router (they are both hosts).
Coaxial cable: A network cable type used in old Ethernet environments, such as 10Base2 and 10Base5. Coaxial cable is seen in high-speed Internet connections with cable companies today.
Fiber optic cable: A unique cable type that has a glass core which carries pulses of light as opposed to copper cable carrying electrical signals (coax and twisted pair cabling).