Chapter 3 Flashcards
three types of popular cables used in modern networking designs: p55
Coaxial
Twisted pair
Fiber optic
contains a center conductor made of copper that’s sur- rounded by a plastic jacket, with a braided shield over it. p55.
Coaxial Cable
A plastic such as polyvinyl chloride (PVC) or fluoroethylenepropylene (FEP, commonly known as. p56
Teflon
The Teflon-type covering is frequently referred to as a what.p56
plenum-rated coating
becomes a serious hazard because its insulation gives off poisonous smoke that gets circulated throughout the whole building.p56
plenum cable
RG-58 U N/A RG-58 A/U Thinnet RG-8 Thicknet RG-59 Cable television Low cost, short distance RG-6 Cable television, cable modems Longer distances than RG-59; some power implementations RG-62 ARCnet (obsolete)p57-58
None Solid copper 10Base-2 Stranded copper 10Base-5 Solid copper N/A Solid copper N/A Solid copper N/A Solid/stranded
What are Twisted-pair cable. p58
consists of multiple individually insulated wires that are twisted together in pairs. Sometimes a metallic shield is placed around them; hence the name shielded twisted- pair (STP).
Cable without outer shielding is called.58
unshielded twisted-pair (UTP)
Ethernet Cable type is the most common today for the following reasons.p59
It’s cheaper than other types of cabling.
It’s easy to work with.
It allows transmission rates that were impossible 10 years ago
connectors; you use a_________ to attach them to a cable, just as you would with BNC connectors. p61
crimper
transmits digital signals using light impulses rather than electricity, it’s immune to EMI and RFI. p61
Fiber-Optic Cable
(SMF) stands for what. p63
single-mode fiber (SMF)
(MMF)stands for what. p63
multimode fiber (MMF)
is a very high-speed, long-distance media that consists of a single strand—sometimes two strands—of fiber glass that carries the signals. p63
Single-mode fiber-optic cable (SMF)
uses light to communicate a signal; but with it, the light is dispersed on numerous paths as it travels through the core and is reflected back. p63
Multimode fiber-optic cable (MMF)
A special material called______ is used to line the core and focus the light back onto it. p63
cladding
A whole bunch of different types of connectors are available to use with fiber-optic cables, but the two most popular are the what. p63
straight tip (ST) and subscriber (or square) connector (SC)
It allows more fiber-optic terminations in the same amount of space than its standard-sized counter- parts.pp63
small form factor (SFF)
(MT-RJ or MTRJ)stands for what. p64
mechanical transfer registered jack (MT-RJ or MTRJ)
(LC)stands for what. p64
Local Connector (LC)
What does serial mean. p68
means that one bit after another is sent out onto the wire or fiber and interpreted by a network card or other type of interface on the other end.
cable standard commonly used for serial data signals connecting data-terminal equipment and data-communications equipment, as when you connect a computer’s serial port to an external modem. p69
RS-232
can actually connect a maximum of 127 external devices, and it’s a much more flexible peripheral bus than either serial or parallel. p69
Universal Serial Bus (USB)
a device can either send communication or receive communication, but not both at the same time. p71
half-duplex
both devices can send and receive communication at the same time. p71
full-duplex
There are different types of wiring standards available: p72
Straight-through cable (586A)
Crossover cable (586B)
Rolled cable (rollover)
Hardware loopback
What is a Straight-Through Cable. p75
The straight-through cable is used to connect a host to a switch or hub, or a router to a switch or hub.
Crossover cables can be used to connect these devices: p75
Switch to switch Hub to hub Host to host Hub to switch Router direct to host
network interface device (NID) or network interface unit, is owned by the PSTN and is a special network interface that’s often used between the service provider’s network and the internal network.p80
Smart Jack
the last point of responsibility of the service provider. It’s often at the MDF in your building connection (if your building is large), but it’s usually just an RJ-45 jack that your channel service unit/data service unit (CSU/DSU) connects into from your router to wide area network (WAN) connections p79
demarc (short for demarcation)
has replaced most telephone wire installations and is also used for computer networking.p79
110 Block
cable consists of 25 individual pairs of wires all inside one common insulating jacket. It’s not generally used for data cabling, just for telephone cabling, and especially for backbone and cross-connect cables because it reduces the cable clutter significantly. p79
25 Pair
a wiring point that’s generally used as a reference point for telephone lines. It’s installed in the building as part of the pre-wiring, and the internal lines are connected to it. p79
main distribution frame (MDF)
located in an equipment or telecommu- nications room. It is connected to the MDF and is used to provide greater flexibility for the distribution of all the communications lines to the building. p79
intermediate distribution frame (IDF)
