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802 standards > cables > Flashcards

cables Flashcards

1
Q

fiber connectors

A

LC
ST (straight tip)
SC (subscriber connector)
MT-RJ

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2
Q

copper connectors

A

RJ-11 (DSL, telephone)
RJ-45 Ethernet
F-connector cable modem

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3
Q

UPC sv APC

A

APC (green) connector is better than UPC (blue)–> more efficient, since lower return loss

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4
Q

Fiber cable

A

No EMI or interference

–> multi mode : short range (up to 2km), less expensive (LED light)

–> single mode: long range (up to 100km), very expensive (laser beams)

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5
Q

Coaxial cable

A

RG-6 & RG-59 used in television/ cable modem and high-speed internet

F-TYPE connector

Twinaxial: 10 Gbs Ethernet SFP
5m long, but rather inexpensive

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6
Q

Copper cable standards

A

CAT 3. 10BASE-T 10Mbps 100m
CAT 5 100-BASE-TX 100Mbps 100m
CAT 5e 1,000BASE-T 1,000Mbps(1G) 100m
Cat 6 10GBASE-T 10Gbps 100M (shielded), 55m (unshielded) 500 MHz
Cat 6A 10GBASE-T 10Gbps 100M.
Cat 7 (shielded) 10GBASE-T 10Gbps 100M
Cat 8 (shielded) 40GBASE-T 40Gbps 30M

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7
Q

T568A VS T658B

A

T568A for horizontal cabling

! WATCH OUT FOR PINS 1,2,3,6

PIN       A          B
1           WG       WO
2           G          O
3          WO      WG
6            O         O
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8
Q

What is an SFP/SPF+/QSFP

A

Transceiver, common with 10Gigabit ethernet

QSFP+ combines four SFPs into a single transceiver, up to 40Gbit/sec

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9
Q

Broadband vs baseband

A

Baseband (Ethernet) uses a single frequency throughout the entire medium

Broadband: uses many frequencies

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10
Q

fiber cable standards

A

100BASE-FX. multimode fiber laser 2km
100BASE-SX. LED. 300m
1,000BASE-SX. Gigabit Ethernet multimode 500m
1,000BASE-LX. Gigabit Ethernet single-mode 5km
10GBASE-SR 10G-E multimode fiber. 400m
10GBASE-LR 10G-E single-mode 10km

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11
Q

copper cables

A

coaxial (RG6 & RG59) / F-type connector/
twin axial (a bit newer) - less energy and less expensive
serial - DB-9 connector
twisted pair - 4 pairs (UTP popular on LAN/ STP more expensive but less EMI)

connectors: RJ-45 (Ethernet) & RJ-11 (phone)

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12
Q

Straight-through (patch) cable

A

568B to 568B

same pinout on both ends of the cable

connects DCE(switch) DTE (workstation)

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13
Q

DTE vs DCE

A

Data communication equipment: (switches, modems, hubs)

Data terminal device: workstation, laptop, desktop

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14
Q

Cross-over cable

A

568B to 568A

–> different pinouts

connects DTE to DTE (workstation to workstation)
DCE to DCE (switch to a switch)

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15
Q

what cable should be used to connect a switch to a switch?

A

crossover cable 568b to 568a

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16
Q

what is a plenum cable?

A

a fire-retardant coating on a cable

must be used in places that you cannot see (ceiling, under carpet)

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17
Q

Tom is running some new CAT 5e cabling in an office building to connect a few offices. The ceiling is constructed as a drop ceiling with fluorescent lights and does not have any cable trays. Due to the proximity of the fluorescent lights to the cable being run, what type of CAT 5e cable should be run?

A

STP (Shielded Twisted Pair) is a type of cabling that can help prevent electrical interferences or cross-talk. A cross-talk is when electrical interference data passing through can cause CRC (Cyclic Redundancy Check) errors. A CRC is used to calculate the before and after checksum is made when transferring data. If electrical interference gets in the way, such as proximity to fluorescent light bulbs, it can cause data to be corrupted and produce an error.

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18
Q

A network technician needs to connect two switches. The technician needs a link between them that is capable of handling 10 Gbps of throughput. Which of the following media would BEST meet this requirement?

A

To achieve 10 Gbps, you should use Cat 6a, Cat 7, Cat 8, or a fiber optic cable.

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19
Q

Which of the following cable types are used for very short-range high-speed applications, such as in SATA 3.0 cables and uplinks between two switches in the same rack-mounted enclosure?

A

Twinaxial cabling, or “Twinax”, is a type of cable similar to coaxial cable, but with two inner conductors instead of one. Due to cost efficiency, it is commonly used in very short-range high-speed differential signaling applications, such as SATA 3.0 cables and uplinks between SFP+ modules in switches or routers.

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20
Q

Which type of cable uses an F-connector?

A

An F-type connector is a coaxial radiofrequency connector commonly used for cable television with an RG-6 cable. RG-6 is a type of coaxial cable used to transmit audio and video signals to devices such as television sets. It is also used with cable modems to transmit data.

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21
Q

What is a typical use case for Category 8 cabling?

A

Interconnecting data center components

Category 8 twisted pair cable can support speeds as high as 25 Gbps or 40 Gbps, with a distance limitation of 30 – 36 meters. With its high speed and its limited distance, Category 8 cabling is well suited for interconnecting components within a data center.

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22
Q

What is the main difference between STP and UTP?

A

shielding

Unshielded Twisted Pair (UTP) and Shielded Twisted Pair (STP) are similar as both cable types have wire pairs that have twists. The Twists in the cables help reduce crosstalk. The main difference between the two is that STP has shielding between the jacket and the wire pairs, while UTP doesn’t.

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23
Q

Julian, a wiring technician, is running ethernet cables through an HVAC system because of space limitations. Which type of cabling should he use?

A

Plenum

When running an Ethernet cable through AC (Air Conditioning) or HVAC (Heating Ventilation and Cooling) systems, Plenum should be used. Plenum cable has a jacket that has characteristics which can stop smoke and stop/slow flames if they were to occur on the cable. When normal PVC (Polyvinyl Chloride) cable burns, it releases a toxin.

24
Q

You are making patch panel cabling for a warehouse. You’ve been asked to make sure the cables use the T568B standard. Which of the following is the correct color coding for the T568B standard?

A

The color coding for the TIA/EIA 568-B standard is Orange/White, Orange, Green/White, Blue, Blue/White, Green, Brown/White, Brown. The color coding for the TIA/EIA 568-A standard is Green/White, Green, Orange/White, Blue, Blue/White, Orange, Brown/White, Brown.

25
Q

You need to maintain compatibility between Fiber and Ethernet cabling. You need a device that terminates fiber on one side and commences an Ethernet connection on the other side. Which of the following devices would you use to best achieve this?

A

A media converter is a device that is used to convert between different types of cables and connectors.

26
Q

You’ve been asked to create new patch panel cabling for a new building. Which of the following tools would you use to attach an RJ-45 connector to an ethernet cable?

A

A Crimper is a device used to attach an RJ-45 Connector to an Ethernet cable. A crimper can also be used to attach connectors to other mediums such as coax. The Crimper crimps the connector onto the cable and creates a firm attachment between the cable and connector. A punch down tool is used to attach cables to a punch down block, which is used to terminate cables.

27
Q

what is OTDR

A

An OTDR (Optical Time-Domain Reflectometer) is used to characterize and troubleshoot fiber links.

28
Q

You are setting up cabling for a new office. All of the cables lead to an MDF and need to be attached to a Punch down block. Which of the following tools should you attach to the cables to a punch down block?

A

A punch down tool is used to attach cables to a punch down block, which is used to terminate cables.

28
Q

You are setting up cabling for a new office. All of the cables lead to an MDF and need to be attached to a Punch down block. Which of the following tools should you attach to the cables to a punch down block?

A

A punch down tool is used to attach cables to a punch down block, which is used to terminate cables.

29
Q

TDR

A

A TDR (Time Domain Reflectometer) is used to certify and troubleshoot cables.

30
Q

Which device measures the amount of light that can pass through a fiber cable?

A

A light meter (Optical Power Meter) can be used with Fiber cables to detect the lumens, or the amount of light that can pass through the fiber cable.

31
Q

You have been contacted in an organization to troubleshoot and fix various network problems. Recently, you’ve noticed that the IT staff hasn’t maintained correct documentation regarding where hosts connect to which switch on the network. Which of the following devices can you use to figure out which device is connected to which switch?

A

A toner probe (signal tracer) is useful in locating a single ethernet cable within bundles of cabling or determining where a device is physically connected to.

32
Q

Marco, a network administrator, has been receiving tickets from technicians stating a switch has failed ports. You decide to inspect the switch and need a tool to quickly inspect the integrity of the port. Which of the following devices should Marco use to best achieve this?

A

A loopback plug is used to verify the integrity of a port. In this case, a switch’s port.

33
Q

What connector is typically used to connect a POTS phone to the PSTN?

A

A RJ-11 connector is used to connect a POTS (Plain Old Telephone Service) phone to a wall jack, which then leads to the PSTN (Public Switched Telephone Network).

34
Q

What connector is typically used with MMF fiber and uses a bayonet connector?

A

ST

A ST (Straight Tip) connector is typically used with MMF (Multimode Fiber) and has a bayonet end. LC (Lucent Connector) is typically used for single mode fiber.

35
Q

What is the color coding for the T568A Standard?

A

The T568A standard use the color codes- Green/white, green, orange/white, blue, blue/white, orange, brown/white, brown.

36
Q

!!!

Joe, a network technician, needs to connect to a router so he can set up SSH for remote administration. He is going to do this through the use of a serial cable. Which type of connector is on the end of the cable?

A

db-9

Connecting to an infrastructure device through a console usually requires one end having an RJ-45 connector and the other having a DB-9 connector.

37
Q

You’ve been tasked to verify the wattage output of an outlet before installing new switches in a wiring closet. Which of the following devices should be used to do this?

A

A multimeter is a device used to measure current, resistance, and voltage. In this case, it can be used to measure the output of an outlet to verify if it’s up to standards.

38
Q

Which of the following devices would be useful for tracking interference problems relating to wireless networks?

A

A Spectrum Analyzer is used to measure frequency in relation to an input signal. In this case, it can also be used in wireless networks to track interference problems.

39
Q

Which type of connector is usually found on the end of an RG-59 cable?

A

An F-Type connector is typically used to terminate an RG-59 cable (coax). These cables are used to carry TV signals but aren’t typically used anymore due to the fact it can’t carry Gigahertz signals very efficiently.

40
Q

What is the main difference between SMF and MMF?

A

A Single Mode Fiber (SMF) cable has the ability to carry a signal longer than Multimode Fiber (MMF). Although MMF fiber can in some cases be used to carry more throughput than SMF, this isn’t always true.

41
Q

Which type of fiber transceiver has largely replaced GBIC largely due to its size?

A

A SFP (Small Form Factor Pluggable) has largely replaced a GBIC (Gigabit Interface Converter) largely due to size.

42
Q

Where is the point in the network where the service provider’s network ends and the client’s network begins?

A

A demarcation point (Demarc) is the handoff where the service provider’s network ends and the customer’s network begins.

43
Q

Which transceiver combines 4 channels for faster throughput in a small form factor?

A

QSPF

A QSFP (Quad SFP) combines four channels instead of 1 as seen with a normal SFP, which in this case, makes the QSFP offer more throughput. An SFP+ is an enhanced version of the SFP that supports 10 Gbps speeds. GBIC is a fiber transceiver that is now considered obsolete because of the introduction of SFP.

44
Q

Miranda, a network technician, was tasked with repairing the phone infrastructure of a company. The company wants to keep the existing, aging infrastructure. Which type of punch down block should she use for the older phone systems?

A

A 66 block is a variation of a punch block that is used to connect telephone wires to a telephone system. An application for a 66 block might be to use it to connect older telephone wires to an older phone system. A 110 block is a variation of a punch block that is used to terminate cable runs, typically used with Ethernet cable.

45
Q

A network engineer wants to connect a branch office to a data center. The distance between the two locations is about 3 Kilometers. Which of the following technologies should he use for connectivity?

A

1000BASE-LX is a fiber optic Gigabit Ethernet standard that has a maximum distance of 5km over single mode fiber (SMF). 1000BASE-T is a standard for Gigabit Ethernet over copper cabling. 1000BASE-SX is a fiber optic Gigabit Ethernet standard that has a maximum distance of 550 meters over multimode fiber (MMF).

46
Q

You are doing cabling for a business. Which of the following Ethernet cable types would you use if you needed to connect two routers together?

A

crossover cable is a type of Ethernet cable used to connect two devices of the same type together, such as two switches or two routers

47
Q

You are connecting a host to a switch. Which of the following Ethernet cable types would you use to connect both devices?

A

An Ethernet straight-through cable is a type of Ethernet cable used to connect hosts to a computer network, such as a PC to a switch.

48
Q

A company has contracted you to run cables. Which type of Ethernet cable types would you use when connecting a host to a switch?

A

An Ethernet straight-through cable is a type of Ethernet cable used to connect hosts to a computer network, such as a PC and switch.

49
Q

Which protocol is used to automatically determine and work with different pinouts of an ethernet cable on a switch?

A

Auto MDIX (Medium-Dependent Interface Crossover) is a technology used by ethernet ports to automatically detect the pinouts of an ethernet cable and adjust the ports configuration to match the pinouts on the other side of a cable.

50
Q

WHERE IS MTJR USED?

A

MTRJ to connect to a distribution switch

LC, SC, ST for walk jack & distribution onto an office

51
Q

A network technician works with a junior technician when the network technician is called away for a more urgent issue. The junior technician orders an SC 80/125 fiber cable instead of an ST 80/125. Which of the following will MOST likely be an issue with the new cable?

A

While both SC and ST are fiber cables, they utilize different connectors. The cable ordered will not be compatible with the current equipment in use. SC (subscriber connector) is nicknamed the “square connector” or the “stick and click” connector. The SC has a push-pull coupling end face with a spring loaded ceramic ferrule. The ST (straight tip) connector uses a rounded bayonet fitment as its connector. The ST is nicknamed the “stick and twist” connector.

52
Q

A technician is troubleshooting a workstation at Dion Training. The workstation is suffering from intermittent connectivity issues. The technician notices that the STP cable pairs are not completely twisted near the connector. Which of the following issues may be experienced because of this?

A

Crosstalk is defined as an effect caused by the unintentional and undesired transmission (leakage) of a signal from one cable to another. Crosstalk can occur if the twisted pairs are not twisted sufficiently, because the twisting of the cable pairs reduces crosstalk between neighboring cable pairs. The twisting is done to help cancel exterior electromagnetic interference. To solve this cable’s crosstalk issue, the cable pairs should be trimmed down and the cable re-terminated again properly.

53
Q

Dion Training has just moved into a new office building and the previous owners never documented which port on the patch panel was connected to the network jacks located in each office. You have been hired to create a wiring diagram to document where all of the cables are connected. Which of the following tools should you use to perform this task?

A

A tone generator is used with a toner probe to accurately identify the location of a cable pair or conductor within a wiring bundle, cross-connection point, or at the remote end. A tone generator is used with copper cables, not fiber optic cables.

54
Q

which device can you use to determine the length of a network cable?

A

TDR /OTDR

55
Q

A network technician has been asked to make the connections necessary to add video transported via fiber optics to the LAN within a building. There will be one fiber connector for the Tx port and another connector for the Rx port. Which of the following type of connectors should be used to connect the fiber optic cables?

A

Straight Tip (ST) fiber connections are commonly used in fiber optic connections in LAN networking applications.

802 standards (25 decks)

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