Interfaces and cables

Question 1

what does the RJ in RJ-45 mean

Answer 1

Registered Jack

Question 2

What is Ethernet

Answer 2

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

Question 3

What is a bit

Answer 3

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

Question 4

what is a Byte

Answer 4

8 bits equal 1 byte

Question 5

How is speed measured?

Answer 5

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

Question 6

How is data measured?

Answer 6

Bytes

Question 7

How much is one kilobit?

Answer 7

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

Question 8

How much is one megabit?

Answer 8

million 1,000,000 bits or 1000 kilobits

Question 9

How much is one gigabit?

Answer 9

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

Question 10

terabyte

Answer 10

trillion bits, 1000 gigabits

Question 11

what is IEE 802.3 standard?

Answer 11

1983 standard for ethernet.

Question 12

what does the base in 10BASE-T mean?

Answer 12

baseband signaling/ can only carry ethernet

Question 13

what does the T in 10BASE-T mean?

Answer 13

Twisted pair

Question 14

10Base-T

Answer 14

Ethernet,
802.3i
100 M
10 Mbps

Question 15

100Base-T

Answer 15

Fast Ethernet,
802.3u
100 Mbps
100 Meters

Question 16

10000Base-T

Answer 16

Gigabit Ethernet,
802.3ab
100 M
1 Gbps

Question 17

10GBase-T

Answer 17

10 Gig Ethernet,
802.3an
100 M
10 Gbps

Question 18

UTP

Answer 18

un-shielded twisted pair. Twist protects against EMI

Question 19

how many wires are in RJ-45?

Answer 19

8

Question 20

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

Answer 20

10BASE-t 100BASE-T

Question 21

What standards only use 4 pairs (8 wires)?

Answer 21

1000Base-T and 10GBase-T

Question 22

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

Answer 22

1 and 2

Question 23

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

Answer 23

1 and 2

Question 24

what is full duplex?

Answer 24

devices can send a receive data at the same time

Question 25

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

Answer 25

4, 5

Question 26

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

Answer 26

3, 6

Question 27

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

Answer 27

1, 2 and 4 ,5 same as a PCs

Question 28

Straight through cable.

Answer 28

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

Question 29

Crossover cable

Answer 29

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

Question 30

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

Answer 30

1, 2 and receive on 3 and 6.

Question 31

switches transmit data on what pins?

Answer 31

transmit 3,6 and receive 1, 2

Question 32

Audio MDIX

Answer 32

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

Question 33

1000Base-T and 10GBASE-T

Answer 33

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

Question 34

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

Answer 34

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

Question 35

How many meters can a copper UDP be used?

Answer 35

100 meters

Question 36

SFP Transceiver

Answer 36

Small form-factor pluggable

Question 37

How do fiber optic cables work?

Answer 37

By sending lite over glass fibers.

Question 38

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

Answer 38

each ends have both receive and transmit connectors.

Question 39

What are the four parts of a fiber cable?

Answer 39

1, fiber glass core which light travles. 2. cladding that reflects light 3. protective buffer that protects cable from breaking. 4. outer jacker of the cable.

Question 40

Multi mode fiber

Answer 40

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.

Question 41

single mode fiber

Answer 41

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.

Question 42

UTP vs fiber

Answer 42

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

Question 43

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

Answer 43

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

Question 44

routers transmit data on which pins?

Answer 44

1, 2

Question 45

to connect Lans that are 150 meters apart.

Answer 45

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

Question 46

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

Answer 46

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

Question 47

can you connect like devices to stright through cables.

Answer 47

no.

Question 48

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

Answer 48

true

Question 49

BIT is short for

Answer 49

binary digit. Smallest unit of data in computer.

Question 50

one byte is equal to

Answer 50

8 bits, one character in a text doc.