Which of the following cables would be used to connect a router to a switch?

A.
v.35

B.
crossover

C.
rollover

D.
straight-through

Explanation:
A straight-through cable would be used. When connecting “unlike” devices, such as a switch to a router, astraight-through cable is used. This is a cable where the wires are in the same sequence at both ends of the
cable.
NOTE: The one exception to this general rule of connecting unlike devices with a straight-through cable is when
a computer NIC is connected to an Ethernet port on a router. In that case, a crossover cable is used.
A v.35 cable is used to connect serial connections between routers. This cable has a male DB-60 connector on
the Cisco end and a male Winchester connector on the network end. It comes in two types: DCE and DTE. It is
often used to simulate a WAN connection in lab environments. In that case, the DCE end acts as the CSU/DSU
and is the end where the clock rate is set. A CSU/DSU (Channel Service Unit/Data Service Unit) is a device
that connects the router to the T1 or T3 line.
A crossover cable has two wires reversed and is used to connect “like” devices, such as a switch to a switch. It
is also used when a computer NIC is connected to an Ethernet port on a router.
A rollover cable is used to connect to the console port of a router to configure the router. It is also called a
console cable.
The diagram below illustrates the correct usage of each of the cable types shown using the following legend:
SO Ethernet Straight through Cable
CO Ethernet Crossover Cable
Serial Serial cable
RO Rollover cable

Objective:
Network Fundamentals
Sub-Objective:
Select the appropriate cabling type based on implementation requirements

Cisco > Product Support > Routers > Cisco 1000 Series Routers > 5-in-1 V.35 Assembly and Pinouts >
Document ID: 46803
Cisco > Tech Notes > Cabling Guide for Console and AUX Ports > Document ID: 12223