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Computer > CompTIA A+ 2 > Flashcards

CompTIA A+ 2 Flashcards

1
Q

How many DNS servers must you have in your IP configuration?

A

2.

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2
Q

What is an IP helper address?

A

Also called a DHCP Relay address, it is an address outside of your local network where a router will send DHCP requests that it receives.

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3
Q

Computers broadcasting for a DHCP server will send a broadcast request to what destination port?

A

UDP port 67.

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4
Q

Servers sending a DHCP broadcast back to computers will send to what destination port?

A

Port 68.

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5
Q

What is APIPA?

A

Automatic private IP addressing.
Aka a link-local address.
- no forwarding by routers.

IETF has reserved 169.254.0.1 - 169.254.255.254

  • first and last 256 addresses are reserved.
  • can use: 169.254.1.0 - 169.254.254.255

Automatically assigned.
- uses ARP to confirm address isn’t already taken on your network.

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6
Q

What is an IPv6 link-local address?

A

Required on every IPv6 enabled interface.

fe80: :/10 with only one subnet allocated.
- effectively becomes fe80::/64.

The last 64 bits are usually created with a modified EUI-64.
- based on the MAC address.

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7
Q

What is WiMAX?

A

Worldwide interoperability for Microwave access.
- wireless high speed internet access.

A line-of-sight service.

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8
Q

What is a WAN?

A

A wide area network.

Basically, connecting to devices across the globe.

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9
Q

What is a MAN?

A

A metropolitan area network.

Larger than a LAN, smaller than a WAN.

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10
Q

What is a WMN?

A

A wireless mesh network.

Connect to each other automatically.
Automatically react to changes.

(Like Zigbee).

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11
Q

What is a tone generator?

A

Puts an analog sound on a wire, then you listen for that sound with another device, like wire tracing.

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12
Q

What is Plenum airspace?

A

Shared airspace in a ceiling where cabling is run as well as HVAC air return, it’s a tie hazard.

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13
Q

If running cable in plenum airspace in a ceiling, what kind of cable do you need?

A

A fire-rated cable jacket.
FEP or low-smoke PVC.

A traditional cable jacket is pvc and is a fire hazard.

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14
Q

What does F/UTP mean on a cable?

A

Foil around the cable and no shielding around the pairs.

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15
Q

What does S/FTP mean on a cable?

A

The cable is shielded and there is foil around each pair.

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16
Q

What do T568A and T568B mean?

A

They are the pin assignments from EIA/TIA-568-B standard (used for Ethernet).
You can’t have the two ends of the cable each using one, they must both be A or B.

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17
Q

What are the two types of coaxial cable?

A

RG-6
Used in television, digital cable and high speed internet.

RG-59
Used as patch cables, not designed for long distances.

Coaxial cables:
Wire conductor inside a (foam looking) dielectric insulator inside a metal shielding inside a plastic jacket.

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18
Q

What is multimode fiber?

A

Fiber for short range communication.
2km for 100 Mbit/s
550 meters for 10 Gbit/s

Usually used with an inexpensive light source like an LED.

Several lights bouncing around in one tube.

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19
Q

What is single mode fiber?

A

For very long distances, over 80km without additional processing.

Expensive light source, like a laser.
One straight light through a narrow tube.

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20
Q

VGA cables have what kind of connector?

A

DB-15.
(Or DE-15)

Analog signal, so degraded after 10 or 15 meters.

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21
Q

How far can HDMI cables extend without losing quality?

A

20 meters.

22
Q

What is a DVI-A?

A

DVI analog.

Flat bar with 4 pins surrounding.

23
Q

What is DVI-D?

A

DVI digital.

24
Q

What is DVI-I?

A

Integrated. Both analog and digital.

25
Q

Difference between single and dual link DVI cables?

A

Single: 3.7 Gbps (HDTV at 60 FPS)

Dual: 7.4 Gbps (hdtv at 85 FPS).

26
Q

A thunderbolt v1 or v2 cable uses what type of connector?

A

An MDP, mini display port standard.

Data and power.

Several versions.

27
Q

A thunderbolt v3 cable uses what connector?

A

USB-C.

Maximum length 3 meters with copper. 60 meters with optical.

Can daisy chain up to 6 devices.

28
Q

USB 3.0 can extend to about what length?

A

~3 meters.

29
Q

A DB-9 serial cable connector is commonly used for what?

A

As a configuration port (serial console interface).

Built for modem communication (modem, printer, mouse, networking).

Commonly used for RS-232.
(Recommended standard 232).

Different sizes A-E.
DA-15, DB-25, DC-37, DD-50, DE-9.

30
Q

SATA connections have what 2 types of connectors?

A

A power connector and a data connector (which goes to the motherboard).

31
Q

What is PATA?

A

Another name for ATA, the thing before SATA.

32
Q

What is SCSI?

A

Small computer systems interface.

Parallel and serial versions exist.

Originally designed to string many devices together with one cable/controller.
- up to 16 in a SCSI “chain.”

Many types of interfaces.

33
Q

What is a BNC connector?

A

Bayonet Neil-Concelman

Coaxial cable connector
- DS3 WAN links.

Rigid and bulky
- can be difficult to work with.

34
Q

What is an F-connector?

A

RG6 or RG-59.

The screw in coax cable such as for cable tv.

35
Q

What shape is a SATA connection?

A

L-shape.

36
Q

What shape is a eSATA connection?

A

Rectangle inside a rectangle with ears on the side.

37
Q

What is a Molex connector?

A

4-pin peripheral power connector.

Provides 12v and 5v.

Rectangle with 4 circular pins and 2 or the corner notches cut out.

Aka an AMP MATE-N-LOK.

38
Q

What is parity memory?

A

RAM used in critical computer systems.

Adds an additional parity bit for error checking. (Not 100% detection).

Can’t correct errors.

39
Q

What is ECC memory?

A

Error correcting code RAM used in critical computer systems.

Detects errors and corrects on the fly.

Looks the same as non-ECC memory.

40
Q

What is an M.2 interface?

A

PCIe bus connection drive with no cables, plugs directly in. Very fast.

Looks like a stick of RAM.

Uses a notch called a B Key, an M Key or both.

41
Q

What is RAID 0?

A

Called striping.

File blocks are split between two or more physical drives.

NO redundancy.

42
Q

What is RAID 1?

A

Mirroring.

Duplication among two or more drives.

43
Q

What is RAID 5?

A

Striping with parity.

Complete redundancy by using parity blocks.

Requires at least 3 disks.

Efficient use of disk space, no actual duplication.

44
Q

What is RAID 10 (1+0)?

A

A stripe of mirrors.

The speed of striping and the redundancy of mirroring.

Need at least 4 drives.

45
Q

Learn what are the important motherboard form factors?

A

ATX, microATX, ITX and mini-ITX.

46
Q

What is the UEFI bios?

A

Unified extensible firmware interface.

Common bios standard.

Designed to replace legacy bios.

Graphical and text-based.

Can boot from very large drives, over 2+ terabyte.

Has a pre-boot environment that is not an operating system but gives functionality.

47
Q

Does CMOS have a battery nowadays?

A

No, batteries on motherboards nowadays are used for keeping the date and time.

There may be a jumper on a modern motherboard that allows resetting the bios though.

48
Q

How to check windows bios version and other info?

A

Type msinfo32 into run.exe.

49
Q

What is hyperthreading?

A

Making one cpu run as if it is multiple CPU’s.

50
Q

What is BCLK?

A

Base clock.
The cpu clock speed.

To overclock, the cpu must be unlocked.

Also, it will void the warranty.

51
Q

What is a TRS connection?

A

Tip ring sleeve. For audio.

TRRS is tip ring ring sleeve, the extra ring is for a microphone.

Computer (11 decks)

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