Module 4 Physical Layer

Question 1

Before any network communications can occur, a _____ to a local network must be established

Answer 1

Physical Connection

Question 2

The connection could be ___ or ____, depending on the setup of the network

Answer 2

Wired or wireless

Question 3

A ______ connects a device to the network.

Answer 3

Network Interface Card (NIC)

Question 4

What are the layers of the OSI model

Answer 4

1. Physical
2. Data LInk
3. Network
4. Transport
5. Session
6. Presentation
7. Application

Question 5

_____ converts the stream of
bits into a format recognizable by
the next device in the network
path

Answer 5

Encoding

Question 6

_____ method is how the bit
values, “1” and “0” are represented on
the physical medium

Answer 6

Signaling

Question 7

_____ is the capacity at which a medium can carry data.

Answer 7

Bandwidth

Question 8

What is the meaning of tbps

Answer 8

Terabits per second

Question 9

_____ measures the amount of data that can flow from one place to
another in a given amount of time; how many bits can be transmitted in a second.

Answer 9

Digital Bandwidth

Question 10

Amount of time, including delays, for data to travel from one given point to another

Answer 10

Latency

Question 11

The measure of the transfer of bits across the media over a given period of time

Answer 11

Throughput

Question 12

The measure of usable data transferred over a given period of time

Answer 12

Goodput

Question 13

____ is the most common type of cabling used in networks today. It i

Answer 13

Copper Cabling

Question 14

the longer the electrical signals have to travel, the weaker they get.

Answer 14

Attenuation

Question 15

_____ is susceptible to interference from two sources, which can distort and
corrupt the data signals (Electromagnetic Interference (EMI) and Radio Frequency Interference
(RFI) and Crosstalk)

Answer 15

Electrical Signal

Question 16

____ is the most common networking
media.

Answer 16

UTP

Question 17

• Terminated with RJ-45 connectors
• Interconnects hosts with intermediary
  network devices.

Answer 17

UTP

Question 18

UTP has _____ of color-coded copper wires
twisted together and encased in a flexible plastic
sheath.

Answer 18

Four Pairs

Question 19

Each wire in a pair of wires uses
opposite polarity. One wire is negative, the other
wire is positive. They are twisted together and the
magnetic fields effectively cancel each other
and outside EMI/RFI.

Answer 19

Cancellation

Question 20

What is the color combination to make T568A

Answer 20

White Green, Green, White Orange, Blue, White Blue, Orange, White Brown, Brown

Question 21

What is the color combination to make T568B

Answer 21

White Orange, Orange, White Green, Blue, White Blue, Green, White Brown, Brown

Question 22

• Better noise protection than UTP
  Shielded Twisted Pair (STP)
• More expensive than UTP
• Harder to install than UTP
• Terminated with RJ-45 connectors
• Interconnects hosts with intermediary
  network devices

Answer 22

Shielded Twisted Pair

Question 23

What are the common use of Coaxial Cable

Answer 23

• Wireless Installations
• Cable Internet Installations

Question 24

Transmits data over longer distances at higher bandwidth than any other
networking media

Answer 24

Fiber Optic Cable

Question 25

Made of flexible, extremely thin strands of very pure glass

Answer 25

Fiber Optic Cable

Question 26

* Very small core * Uses expensive lasers * Long-distance applications

Answer 26

Single Mode Fiber

Question 27

* Larger core * Uses less expensive LEDs * LEDs transmit at different angles * Up to 10 Gbps over 550 meters

Answer 27

Multimode Fiber

Question 28

____ refers to the spreading out of a light pulse over time. Increased dispersion means increased loss of signal strength.

Answer 28

Dispersion

Question 29

Used for backbone cabling applications and interconnecting infrastructure devices

Answer 29

Enterprise Network

Question 30

Used to provide always-on broadband services to homes and small businesses

Answer 30

Fiber to Home (FTTH)

Question 31

Used by service providers to connect countries and cities

Answer 31

Long-Haul Networks

Question 32

Used to provide reliable high-speed, high-capacity solutions capable of surviving in harsh undersea environments at up to transoceanic distances

Answer 32

Submarine Cable Networks

Question 33

_____ is primarily used as backbone cabling for high-traffic, point-to-point connections between data distribution facilities and for the interconnection of buildings in multi-building campuses.

Answer 33

Optical Fiber

Question 34

What are some limitation of wireless media

Answer 34

1. Coverage Area 2. Interference 3. Security 4. Shared Medium

Question 35

Effective coverage can be significantly impacted by the physical characteristics of the deployment location.

Answer 35

Coverage Area

Question 36

Wireless is susceptible to interference and can be disrupted by many common devices.

Answer 36

Interference

Question 37

Wireless communication coverage requires no access to a physical strand of media, so anyone can gain access to the transmission.

Answer 37

Security

Question 38

WLANs operate in half-duplex, which means only one device can send or receive at a time. Many users accessing the WLAN simultaneously results in reduced bandwidth for each user

Answer 38

Shared Medium

Question 39

Wireless LAN (WLAN) technology

Answer 39

Wi-Fi

Question 40

Wireless Personal Area network (WPAN) standard

Answer 40

Bluetooth

Question 41

Uses a point-to-multipoint topology to provide broadband wireless access

Answer 41

WiMAX

Question 42

Low data-rate, low power-consumption communications, primarily for Internet of Things (IoT) applications

Answer 42

Zigbee

Question 43

Concentrate wireless signals from users and connect to the existing copper-based network infrastructure

Answer 43

Wireless Access Point (AP)

Question 44

Provide wireless communications capability to network hosts

Answer 44

Wireless NIC Adapters