Networking Topologies, Connectors, and Wiring Standards Flashcards
Why would a network administrator use plenum-rated cable during an installation? (Choose two.)
Low combustion temperature
High combustion temperature
Reduces toxic gas released during a fire
Is not susceptible to any interference
High combustion temperature
Reduces toxic gas released during a fire
Plenum-rated means that the cable’s coating doesn’t begin burning until a much higher temperature of heat, doesn’t release as many toxic fumes as PVC when it does burn, and is rated for use in air plenums that carry breathable air, usually as nonenclosed fresh-air return pathways that share space with cabling
Which of the following Ethernet unshielded twisted-pair cabling types is/are commonly used?
10BaseT
100BaseTX
1000BaseTX
All of the above
All of the above
UTP is commonly used in twisted-pair Ethernet like 10BaseT, 100BaseTX, 1000BaseTX, and so on
In which of the following categories is UTP cable not rated?
Category 3
Category 5e
Category 9
Category 9
Unshielded twisted-pair has standards from Category 2 through 8 for use on Ethernet networks. There is no Category 9 defined
What type of connector does UTP cable typically use?
BNC
ST
RJ-45
RJ-45
UTP usually connects with RJ-45. You use a crimper to attach an RJ connector to a cable
Which of the following provides the longest cable run distance?
Single-mode fiber
Multimode fiber
Category 3 UTP
Single-mode fiber
Single-mode fiber allows for the maximum cable run distances
You need to crimp on a connector using an RJ-45 connector. Which pin-out configuration would you use to connect a host into a switch?
UTP
Straight-through
Crossover
Straight-through
You would use a straight-through cable to connect a host to a switch, and the typical pin-out is called T568A
Why is fiber-optic cable immune to electromagnetic interference (EMI) and radio frequency interference (RFI)?
Because it transmits analog signals using electricity
Because it transmits analog signals using light impulses
Because it transmits digital signals using light impulses
Because it transmits digital signals using light impulses
Fiber-optic cable transmits digital signals using light impulses rather than electricity; therefore, it is immune to EMI and RFI
What type of cable transmits lights from end to end?
Coax
Fiber-optic
UTP
Fiber-optic
Remember that fiber-optic cable transmits a digital signal using light impulses. Light is carried on either a glass or a plastic core
What is the main difference between single-mode fiber (SMF) and multimode fiber (MMF)?
Electrical signals
Number of light rays
Number of digital signals
Number of light rays
The difference between single-mode fibers and multimode fibers is in the number of light rays (and thus the number of signals) they can carry. Generally speaking, multimode fiber is used for shorter-distance applications and single-mode fiber for longer distances
What type of cable should be used if you need to make a cable run longer than 100 meters?
Category 5e
Category 6
Fiber-optic
Fiber-optic
Standards limit UTP to a mere 100 meters. Different fiber-optic types have different maximum lengths, but fiber-optic is the only cable type that can extend well beyond 100 meters
Which of the following are fiber-optic connectors? (Select three.)
BNC
ST
RJ-11
SC
LC
ST
SC
LC
There are many different types of fiber-optic connectors. SC, ST, LC, and MT-RJ are some of the more typical connectors in use today
You need to connect two devices on a network and they need to send voice traffic. Which of the following cables will you use?
Cat 3
Cat 5
Cat 8
Cat 5
To connect two devices for voice on a vertical connect, the minimum cable you can use is Category 5
How many hosts on a half-duplex segment can talk at one time?
Zero
One
Two
One
In half-duplex communication, a device can either send communication or receive communication, but it cannot do both at the same time
On which type of cable does EMI have the least effect?
Coax
Fiber-optic
UTP
Fiber-optic
Fiber-optic cable transmits only light (not electricity like UTP), so EMI has zero effect on it
How many devices can be connected to a full-duplex segment?
Zero
One
Two
Two
Full-duplex communication requires a point-to-point configuration because the collision-avoidance circuit is disabled
How many wires are used in a 100BaseTX UTP transmission?
Two
Four
Six
Four
100BaseTX utilizes only pins 1, 2, 3, and 6
A crossover cable is used to connect all of the following except ______________.
Host to host
Hub to switch
Host to switch
Host to switch
All devices that are pinned the same for transmit and receive require a crossover cable to communicate directly
How is a T1 crossover cable wired?
Pins 1, 2, 4, and 5 are connected to 4, 5, 1, and 2.
Pins 2, 3, 4, and 5 are connected to 4, 5, 1, and 2.
Pins 1, 2, 4, and 5 are connected to 3, 4, 5, and 6.
Pins 1, 2, 4, and 5 are connected to 4, 5, 1, and 2.
A T1 cable uses pairs 1 and 2, so connecting two T1 CSU/DSU devices back-to-back requires a crossover cable that swaps these pairs. Specifically, pins 1, 2, 4, and 5 are connected to 4, 5, 1, and 2, respectively
The purpose of the demarcation point is to separate the customer from whom?
Headquarters
The data center
The service provider
The service provider
The demarcation point, or demarc, is the point at which the operational control or ownership changes from your company to a service provider. This is often at the MDF in relation to telephone connections and the CSU/DSU in regard to WAN connections
You need to make a T568B cable for a Fast Ethernet link. How many pairs will you use?
One
Two
Three
Two
Fast Ethernet is 100BaseTX and this type of cable uses two pairs of wires
