Data transfers over networks

Question 1

Bluetooth

Answer 1

Low energy use variant of bluetooth which allows for a mesh network

Question 2

RFID Radio frequency ID

Answer 2

uses electromagnetic fields to read data stored in embedded tags.

Question 3

NFC Near field communication

Answer 3

Enables two electronic devices to communicate within 4 cm range

Question 4

Infrared IR

Answer 4

Operated within line of sight

Question 5

Z-wave

Answer 5

Provides short range, low latency data transfer with slower rates and less consumption than wifi used with home automation

Question 6

ANT+

Answer 6

Collection of sensory data tire pressure sensor

Question 7

Broadband

Answer 7

Divides width into separate channels (cable tv)

Question 8

Baseband

Answer 8

Uses all available frequencies on a medium cable to transmit data and uses a reference clock to coordinate the transmissions by both sender and receiver.

Question 9

Logical Link Control (LLC)

Answer 9

Provides connection services and allows acknowledgement of receipt of messages. Basic form of flow control.
provide basic error control functions.

Question 10

Media Access Control (MAC)

Answer 10

Physical addressing system that uses a 48 bit address assigned to a network interface card (NIC) by manufacturers.

Question 11

Logical addresses

Answer 11

Numerous routed protocols were used for logical addressing over the years but only internet protocol (IP) remains dominant.

Question 12

Route Discovery and selection

Answer 12

Manually configured as a static route or dynamically through a routing protocol.

Question 13

Internet control message protocol (ICMP)

Answer 13

Used to send error messages and operational information about an IP address.

Question 14

UDP User Datagram Protocol

Answer 14

Connectionless protocol that is an unreliable way to transport segments across the network. If dropped sender is unaware but really good for audio and visual streaming.

Question 15

TCP Transmission control protocol

Answer 15

Connection oriented protocol that is a reliable way to transport segments across the network.

Question 16

N map (Network Mapper)

Answer 16

Command line tool that maps the network.

Question 17

Link Aggregation 802.3ad

Answer 17

Allows for a combo of multiple physical connections into a single logical connection. With this, bandwidth available is increased and the congestion is minimized or prevented.

Question 18

Power over Ethernet (POE 802.3af, POE+ 802.at)

Answer 18

Supplies electrical power over ethernet and requires CAT5 or higher copper cable. (poe 802.af can put up to 15.4 watts of power to that device.)
(POE+ 802.at can put up 25.5 watts of power.)

Question 19

User Authentication

802.1x

Answer 19

For security purposes, switches can require users to authenticate themselves before gaining access to the network. Once authenticated, a key is generated and shared between the supplicant(device wanting access) and the switch (authenticator)

Question 20

Data Formatting

Answer 20

Data if formatted by the computer to have compatibility between different devices.
ASCII American Standard Code for Information Interchange

Question 21

Application Services

Answer 21

Unite communicating components from more than one network application.

Question 22

Circuit switching

Answer 22

dedicated communication link is established between 2 devices.

Question 23

Message switching

Answer 23

data is divided into messages similar to packet switching except these messages maybe stored then forwarded.

Question 24

Windowing

Answer 24

Allows the clients to adjust the amount of data sent in each segment and continually adjusts to send more or less data per segment transmitted.

Question 25

Packet switching

Answer 25

Known as “routing” where data is divided into packets and forwarded.

Question 26

Connection services

Answer 26

Layer 3 augments layer 2 to improve reliability.

flow control and packet reordering.

Question 27

Transmission Modulation

Answer 27

If it changes during the clock cycle, then a 1 is represented (otherwise it is a 0 “zero”

Question 28

Buffering

Answer 28

Occurs when devices, such as routers, allocate memory to store segments if bandwidth isn’t readily available.

Question 29

Service Advertisement

Answer 29

This is where applications send out announcements to other device on the network to stat the services they offer.

Question 30

Encryption

Answer 30

used to scramble the data in the transit to keep it secure from prying eyes and provides confidentiality of data.

Question 31

Reference #

Answer 31

1. Categorize functions of the network into particular layers.
2. Compare technologies across different manufacturers.
3. Understand how to best the communicate with that device.

Question 32

Ad Hoc Mode

Answer 32

Decentralized wireless network which creates peer to peer connections and does not require a router or access point.

Question 33

Infrastructure Mode

Answer 33

Uses WAP wireless access point as a centralized point like a star supports wireless security controls and centralized management.

Question 34

asynchronous

Answer 34

Network devices reference their own internal clocks and use start/stop bits. Uses start bits and stop bits to indicate when transmissions occur from sender to receiver. EX Voicemail.

Question 35

Synchronous

Answer 35

Network devices agree on clocking method to indicate beginning and end of frames and can use control characters or separate timing channels.
uses a reference clock to coordinate the transmissions by both sender and receiver.

Question 36

Isochronous

Answer 36

Network devices use a common reference clock source and create time slots for transmissions with less overhead than synchronous or asynchronous methods.