Which type of Category 5 unshielded twisted-pair (UTP) cable is used to work as a trunk between two switches?
A.
RJ-45 straight-through
B.
RJ-41 crossover
C.
RJ-11 straight-through
D.
RJ-45 crossover
Explanation:
An RJ-45 crossover cable connects two switches. To act as a trunk a trunking protocol such as ISL or 802.1q must be configured on the link. . A trunk is a
connection between two switches that is used to carry traffic from multiple VLANs.
In general, the rule to follow when choosing between a straight-through and a crossover cable is:
– When connecting like devices (i.e. router to router, switch to switch), use a crossover cable.
– When connecting dissimilar devices (i.e. switch to router), use a straight-through cable.
The one exception to this rule is when connecting a computer NIC to a router, in which case a crossover cable is used. Be aware, however, that many devices,
including network cards in computers, now have the ability to sense automatically when they are connected to a like device and adapt to the connection, making
crossover cables unnecessary in those situations.
You should not choose an RJ-45 straight-through cable. The cable type to be used depends on the circuit connection of the hardware. To connect two switches, a
crossover cable is required. The difference between a straight-through cable and a crossover cable lies in the location of the wire termination on the two ends of an
RJ-45 cable. If the UTP cable wire connects Pin 1 of one side to Pin 1 of other side and Pin 2 to 2 through all eight pins of the RJ 45 connector, the cable is said to
be straight-through. On the other hand, if Pin 1 of one side of an RJ-45 cable connects to Pin 3 of the other end, and Pin 2 connects to Pin 6 of the other end, it is
known as a crossover cable. A straight-through cable is used to connect a computer’s network interface card (NIC) to a hub or switch.
You should not choose an RJ-41 crossover cable. RJ-41is a single-line universal data jack normally associated with fixed-loss loop (FLL) or programmed (P)modems. It is not used between switches.
You should not choose an RJ-11 straight-through cable type. RJ-11 UTP cables have four pins and are used to connect voice instruments. RJ-11 UTP cables are
not intended for connecting computers and transferring data. They are commonly used for telephones and modems.
Note: Cisco switches have an auto-mdix feature that notices when the wrong cabling pinouts are used,and readjusts the switch’s logic so that the cable will work.
Objective:
Network Fundamentals
Sub-Objective:
Select the appropriate cabling type based on implementation requirementshttp://docwiki.cisco.com/wiki/Internetwork_Design_Guide_–_Designing_Switched_LAN_Internetworks#Designing_Switched_LAN_Internetworks
https://www.cisco.com/c/en/us/support/docs/routers/7000-series-routers/12223-14.html#topic4