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CCNA > Interfaces and cables > Flashcards

Interfaces and cables Flashcards

1
Q

what does the RJ in RJ-45 mean

A

Registered Jack

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2
Q

What is Ethernet

A

Collection of network protocols/standards/ rather then a single protocol. Not one single thing.

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3
Q

What is a bit

A

Binary Digit. a value, represented by binary code, zeros or ones.

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4
Q

what is a Byte

A

8 bits equal 1 byte

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5
Q

How is speed measured?

A

In bits per second. kilo, mega, gigabits per second. not bytes

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6
Q

How is data measured?

A

Bytes

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7
Q

How much is one kilobit?

A

1,024 bits. 1/3 a page of text

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8
Q

How much is one megabit?

A

million 1,000,000 bits or 1000 kilobits

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9
Q

How much is one gigabit?

A

a billion bits 1,000,000,000/ 1000 megabits

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10
Q

terabyte

A

trillion bits, 1000 gigabits

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11
Q

what is IEE 802.3 standard?

A

1983 standard for ethernet.

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12
Q

what does the base in 10BASE-T mean?

A

baseband signaling/ can only carry ethernet

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13
Q

what does the T in 10BASE-T mean?

A

Twisted pair

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14
Q

10Base-T

A

Ethernet,
802.3i
100 M
10 Mbps

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15
Q

100Base-T

A

Fast Ethernet,
802.3u
100 Mbps
100 Meters

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16
Q

10000Base-T

A

Gigabit Ethernet,
802.3ab
100 M
1 Gbps

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17
Q

10GBase-T

A

10 Gig Ethernet,
802.3an
100 M
10 Gbps

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18
Q

UTP

A

un-shielded twisted pair. Twist protects against EMI

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19
Q

how many wires are in RJ-45?

A

8

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20
Q

What standards only use 2 pairs (4 wires out) of the 8?

A

10BASE-t 100BASE-T

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21
Q

What standards only use 4 pairs (8 wires)?

A

1000Base-T and 10GBase-T

22
Q

which pins can PC transmit data on 10BASE-t 100BASE-T

A

1 and 2

23
Q

Which pins does a switch receive data 0n 10BASE-t 100BASE-T

A

1 and 2

24
Q

what is full duplex?

A

devices can send a receive data at the same time

25
Q

which pins do PCs revice data on 10BASE-t 100BASE-T

A

4, 5

26
Q

which pins do switch transmit data on 10BASE-t 100BASE-T

A

3, 6

27
Q

Routers send data on which pins and receive data on which pins. 10BASE-t 100BASE-T

A

1, 2 and 4 ,5 same as a PCs

28
Q

Straight through cable.

A

pin 1 connects to pin1, pin 2 connects to 2 and 3 to 3, 4 to 4. Connects different devices to each other.

29
Q

Crossover cable

A

connects like devices. pins 1,2 connect to 3,6 wires are crossed over each other.

30
Q

routers, firewalls and PC transmit and receive data on which pins?

A

1, 2 and receive on 3 and 6.

31
Q

switches transmit data on what pins?

A

transmit 3,6 and receive 1, 2

32
Q

Audio MDIX

A

Allows devices to detect which pins neighbors transmit data on, and can then adjust which pins they use to transmit and receive data.

33
Q

1000Base-T and 10GBASE-T

A

all eight are used. 4,5 and 7 and 8

34
Q

What can pairs of wires do in 1000Base-T and 10GBASE-T that 10BASE-t 100BASE-T cannot?

A

Each pair can transmit data bi-directionally. Meaning each pair is committed only to receving or transmitting data.

35
Q

How many meters can a copper UDP be used?

A

100 meters

36
Q

SFP Transceiver

A

Small form-factor pluggable

37
Q

How do fiber optic cables work?

A

By sending lite over glass fibers.

38
Q

Why do fiber optic cables have two connectors on both ends?

A

each ends have both receive and transmit connectors.

39
Q

What are the four parts of a fiber cable?

A

1, fiber glass core which light travles.

  1. cladding that reflects light
  2. protective buffer that protects cable from breaking.
  3. outer jacker of the cable.
40
Q

Multi mode fiber

A

Core is wider then single mode.
That allows multiple angles, (modes) of light to enter the fiberglass core.
allows longer cables than UTP but shorter cables than single-mode fiber.
cheaper then single-mode fiber(due to cheaper led-based SFP transmitters.
Not as fast or long as single mode.

41
Q

single mode fiber

A

core i narrower then multimode,
light enters at a single angle(mode) from a laser based transmitter.
allows longer cables then multi and UDT cables.
more $ then multimode. due to laer-based SFP transmitters.

42
Q

UTP vs fiber

A

UTP is lower cost, shorter max distance, vulnerable to EMI

43
Q

You connect two old routers together with a UTP cable. however the data is not successfully sent and received between them.

A

Older routers do not have MDIX and can only communicate with a cross over cable.
most likey they are connected with stight through cable.

44
Q

routers transmit data on which pins?

A

1, 2

45
Q

to connect Lans that are 150 meters apart.

A

multi mode fiber. because its cheaper then single mode. supports distance over 150 meters

46
Q

connections over 3K apart what kind of cable would you use.

A

Single mode. because multi mode does not support distances over 3K

47
Q

can you connect like devices to stright through cables.

A

no.

48
Q

most switches do not have enough SFP interfaces to support many end devices.

A

true

49
Q

BIT is short for

A

binary digit. Smallest unit of data in computer.

50
Q

one byte is equal to

A

8 bits, one character in a text doc.

CCNA (18 decks)

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