comptia network+ exam n10-006 course 01 - network …€¦ · comptia network+ exam n10-006 ......
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CompTIA Network+ Exam N10-006
Course 01 - Network Theory
Slide 1
OSI Model Location
Application7
Presentation6
Session5
Transport4
Data Link2
Physical1
Network3
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Slide 2
OSI Model Location
Application7
Presentation6
Session5
Physical1
Data Link2
Network3
Transport4
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Slide 3
OSI Model Location
Application7
Presentation6
Session5
Data Link2
Physical1
Network3
Transport4
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Slide 4
The IEEE 802.11 Standard
Standard Speed
(Mbps)
Frequency
(Ghz)
Range
(meters)
MIMO
Streams
802.11a 54 5 20 1
802.11ac 433/channel 5 35 8
802.11b 11 2.4 100 1
802.11g 54 2.4 100 1
802.11n 150 2.4 or 5 70 4
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Slide 5
The OSI and TCP/IP Models
Compare the layers of the OSI and
TCP/IP models
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Slide 6
OSI Layer 7
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Slide 7
OSI Layer 6
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Slide 8
OSI Layer 5
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Slide 9
OSI Layer 4
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Slide 10
OSI Layer 3
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Slide 11
OSI Layer 2
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Slide 12
OSI Layer 1
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Slide 13
LAN Compared with the OSI Model
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Slide 14
TCP/IP Architecture
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Slide 15
LANs
LAN 2
Router
LAN 1
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Slide 16
WANs
Internet
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Slide 17
Network Coverage Areas
MAN
CAN
PAN
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Slide 18
The Internet
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Slide 19
Intranets
Intranet
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Slide 20
Extranets
Intranet
External Client
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Slide 21
Enterprise Networks
LAN
Internet
Branch Office
Headquarters
Remote Client
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Slide 22
Specialized Network Types
ICS:
– SCADA - Supervisory Control and Data
Acquisition
– DCS:
PLCs
Medianet:
– VTC
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Slide 23
Network Configurations
Centralized or hierarchical
Client/server
Peer-to-peer
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Slide 24
Centralized Networks
Connect to the host via
terminals or terminal
emulators
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Slide 25
Client/Server Networks
Clients perform basic end-user tasks
Server provides processing
power, management services,
and administrative functions
Client 1
Server
Client 2
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Slide 26
Peer-to-Peer Networks
Resource sharing, processing, and communications
control are completely decentralized
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Slide 27
Mixed Mode Networks
Clients with terminal emulators
Incorporates elements from more
than one network model
Server Client/Peer
Client/Peer
Mainframe
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Slide 28
Network Topologies
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Slide 29
Frequencies and Overlap of
Wireless Channels
2
2.417
1
2.412
3
2.422
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2.427
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2.432
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2.437
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2.442
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2.447
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2.452
10
2.457
11
2.462
12
2.467
13
2.472
14
2.484
Channel
Center
Frequency
(GHz)
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Slide 30
Radio Networking
Signals are sent
via RF waves
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Slide 31
Broadcast Radio
Non-directional single
frequency transmission
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Slide 32
Spread Spectrum
Signal is sent
over more than
one frequency
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Slide 33
Infrared Transmission
Signals sent as infrared light pulses.
Transmit at 300 GHz to 300,000 GHz.
Receiver needs unobstructed view of
sender.
Signal can reflect off hard surfaces.
Used for:
– Remote control systems.
– Security sensors.
– Manufacturing sensors.
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Slide 34
Bluetooth
30 meters
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Slide 35
Microwave Transmission
Sender transmits
electromagnetic signals
Receiver has an
unobstructed view
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Slide 36
Data Transmission
Exchange of data among computers
and other networked devices.
Data types:
– Voice
– Graphics
– Animations
– Audio
– Text
– Video
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Slide 37
Analog Signals
One-second frequency
Amplitude
Cycle Phase
Crest
Trough
Wavelength
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Slide 38
Digital Signals
One at a positive voltage
Zero at the ground or
zero voltage state
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Slide 39
Digital Data Transmission
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Slide 40
Unicast Transmission
Client A Client B Client C Client DServer
Client A sends
transmission to Server
Server receives
transmission from Client A
Clients B, C, and D
ignore the transmission
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Slide 41
Broadcast Transmission
Client A Client B Client C Client DServer
Client A sends
transmission to Server
All nodes on the network
receive the transmission
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Slide 42
Multicast Transmission
Client A Client B Client C Client DServer
Server sends transmission to
members of multicast group
Multicast members
receive the transmission
Client A is not member of multicast
group and ignores transmission
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Slide 43
Anycast Transmission
Client A Client B Client C Client DServer
Server sends transmission
to nearest group member
Nodes not in the group
ignore the transmission
Client D receives the transmission and then
sends it to next nearest group member
1
2
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Slide 44
Serial Data Transmission
Bits are transmitted one per clock cycle.
Bits move across a single transmission medium.
Data throughput limited:
– Synchronization bits
– Start and stop bits
– Error correction bits
Synchronous or asynchronous communication.
Used in Ethernet networks.
Serial devices:
– Keyboards
– Mice
– Modems
– Other devices
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Slide 45
Parallel Data Transmission
Multiple bits are transmitted per clock cycle.
Bits move across multiple transmission
media.
Data throughput improved because non-
data bits do not travel with data bits.
Parallel devices:
– Printers
– Scanners
Other uses:
– PC system bus
– SCSI data bus
– PC Card bus
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Slide 46
Baseband Transmission
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Slide 47
Broadband Transmission
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Slide 48
Transmission Speeds
Bit rate
Baud rate
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Slide 49
Types of Media Access
Contends for
media access
Central device determines
media access
WiMAX
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Slide 50
Polling
Controlled media access method:
– Each device is contacted.
– Each node is guaranteed media access.
Demand priority:
– Nodes signal:
Ready to transmit
Idle
High priority
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Slide 51
CSMA/CA
3. RTS signal
2. Check network
1. Data to transmit6. Monitor for RTS signal
5. Transmit
4. Wait
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Slide 52
CSMA/CD
3. Transmit
2. Check network
1. Data to transmit
5. Wait
4. Collision
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Slide 53
Multiplexing
Combined Signal
Multiplexer
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Review Questions:
1. True or False: The Presentation layer is the top layer of the OSI model.
A. True
B. False
2. True or False: The IEEE 802.11n Standard has a range of 125 meters.
A. True
B. False
3. True or False: The OSI model and TCP/IP model have the same number of
layers.
A. True
B. False
4. True or False: In peer-to-peer networks, resource sharing, processing, and
communications control are completely decentralized.
A. True
B. False
5. Which of the following is NOT a transmission type?
A. Unicast
B. Broadcast
C. Multicast
D. Precast
Answer Key:
1. B
False. The Application layer is the top most layer of the OSI model.
2. B
False. The IEEE 802.11n Standard has a range of 70 meters.
3. B
False. The OSI model has 7 layers, whereas the TCP/IP model has 4 layers.
4. A
True. In peer-to-peer networks, resource sharing, processing, and
communications control are completely decentralized.
5. D
Precast is not a valid transmission type.