Review 2 Flashcards
What is the recommended humidity level in a server room?
50-65%
What is Attenuation?
the loss of signal strength from one end of a cable to the other.
What is the optimum temperature for computer equipment?
68 degrees F
What is crosstalk?
Interference caused by signals within the twisted pairs of wires.
What does a multimeter measure?
The voltage, current and resistance of devices.
Which of the following is true about single-mode fiber optic network cabling?
It’s less expensive than multi-mode fiber optic cabling.
Its central core is smaller than the standard multi-mode fiber optic cabling core.
It has shorter segment lengths than multi-mode fiber optic cabling.
It’s optimized for 850 nm and 1300 nm light sources.
Its central core is smaller than the standard multi-mode fiber optic cabling core.
You want to implement an Ethernet network at very long distances using fiber optic cables. Which cable type would you choose?
1000BaseLX
1000BaseSX
1000BaseCX
10GBaseSR
1000BaseLX
What polishing grade designation is used to reduce back reflection as much as possible?
Angled Physical Contact (APC)
Why might you use an RJ11 connector?
You want to upgrade your 10BaseT network to 100BaseTX.
You want to connect your computer to the internet with a DSL modem.
You want to connect your computer to a network using a Cat 7 cable.
You want to connect a 10GBaseT network to a switch card using a Cat 6 cable.
You want to connect your computer to the internet with a DSL modem.
What is the best kind of cable to protect against EMI?
Fiber-optic.
Which of the following cable types often includes a solid plastic core that keeps the twisted pairs separated?
Cat 5e
Cat 3
Cat 6
Cat 5
Cat 6
Which of the following is an advantage of using fiber optic cabling for a network?
Easy to work with
Immunity to electromagnetic interference
No special training or equipment is required
Lower installation cost
Immunity to EMI
You want to create a rollover cable that has an RJ45 connector on both ends. How should you connect the wires within the connectors?
Use the T568A standard on one end and the T568B standard on the other end.
Connect each pin on one end to the same pin on the other end (pin 1 to pin 1, pin 2 to pin 2, etc.).
Connect pin 1 to pin 8, pin 2 to pin 7, pin 3 to pin 6, and pin 4 to pin 5.
Connect pin 1 to pin 3 and pin 2 to pin 6.
Connect pin 1 to pin 8, pin 2 to pin 7, pin 3 to pin 6, and pin 4 to pin 5.
Which of the following is true about half-duplex mode?
Collision detection is turned on.
Collision detection is turned off.
The device can send and receive at the same time.
It requires switches with dedicated switch ports.
Collision detection is turned off.
Which of the following actions will NOT protect you against EMI/RFI?
Avoid installing cables near EMI/RFI sources.
Grounding the drain wire on copper cables.
Use fiber optic cables.
Use unshielded twisted pair cables.
Use unshielded twisted pairs cables.
If you connect single-mode fiber to multi-mode fiber, you will introduce a catastrophic signal loss of up to what percent?
75%
90%
50%
99%
99%
A(n) __________ occurs when electrical signals take a path other than the intended path.
electrical short
Which of the following physical topologies is used with Ethernet networks?
Token
Bus
Ring
Mesh
Bus
How many air exchanges per/hour does a server room need?
Between 30 and 40
Between 10 and 20
Between 20 and 30
Approximately 2
Between 20 and 30
Which of the following connectors is used with Ethernet 100BaseTX networks?
RJ45
ST
BNC
GG45
RJ45
