... khoa - Website: www.bkacad.com
Chapter 2 - Communicating
over the Network
CCNA Exploration4. 0CCNA Exploration4.0
End Devices and their Role on the Network
• The network devices that people ... Devices and their Role on the Network
• Intermediary devices to provide connectivity and to work behind the scenes to
ensure that data flows across the network.
• These devices connect the individual ... research, the ISO created a network model that helps vendors
create networks that are compatible with other networks.
• The Open System Interconnection (OSI) reference model released in 19 84
was the...
... running the FTP daemon (FTPd).
• The client establishes the first connection to the server on TCP port 21 . The
client establishes the second connection to the server over TCP port 20 .
• The file ...
Functionalityand Protocols
CCNA Exploration4. 0CCNA Exploration4.0
DNS - Example
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FTP
• The File Transfer Protocol (FTP) is another commonly used Application ... request message to a server, the HTTP protocol
defines the message types the client uses to request the web page and
also the message types the server uses to respond. The three common
message...
... affecting the success of communication include:
– The quality of the pathway between the sender and the recipient
– The number of times the message has to change form
– The number of times the message ... Networks
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Chapter 1 - Living in
a Network Centric World
CCNA Exploration4. 0CCNA Exploration4.0
Học viện mạng Bách khoa -
Website: www.bkacad.com
Networking ... readressed
– The number of other messages being transmitted simultaneously on the
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– The number of other messages being transmitted simultaneously on the...
... www.bkacad.com
Speed and Types of Ports/Interfaces
• The speed : 10/ 100 / 100 0 Mbps. Can increased speeds without replacing
the devices.
• The number and type of ports:
– Just enough ports for ... Contains the
intermediary devices - hubs, switches, routers, and data service units
(DSUs) - that tie the network together. These devices provide the
transitions between the backbone cabling and the ... connect the telecommunication rooms with the work areas, 90
meters max.
Backbone Cabling, or vertical cabling
• To connect the telecommunication rooms to the equipment rooms,
where the servers...
... more complex. Gigabit
Ethernet uses two separate encoding steps.
100 0BASE-T Ethernet
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100 0BASE-T Ethernet
• 100 0BASE-T Ethernet provides full-duplex ... during the interframe spacing.
• The principal differences among the 100 0BASE-SX and 100 0BASE-LX fiber
versions are the link media, connectors, and wavelength of the optical signal.
Layer 2 addressing ... to 100 0 Mbps.
• 100 0BASE-T uses 4D-PAM5 line encoding to obtain 1
Gbps data throughput.
Layer 2 addressing and its Impact on Network Operation
and Performance
• The Frame – Encapsulating the...
... implementing this standard therefore operate at the
same radio frequency and range as 8 02 .11b but with the bandwidth of
8 02 .11a.
• IEEE 8 02 .11n - Is currently in draft form. The proposed standard ...
defines frequency of 2 .4 Ghz or 5 GHz. The typical expected data rates
are 100 Mbps to 2 10 Mbps with a distance range of up to 70 meters.
• The benefits are evident, especially the savings on costly ... standards.
• IEEE 8 02 .11b - Operates in the2 .4 GHz frequency band, speed up to
11 Mbps. Longer range and better able to penetrate building structures
than devices based on 8 02 .11a.
• IEEE 8 02 .11g - Operates...
... network when
24
• The Data Link layer "sees" the logical topology of a network when
controlling data access to the media. It is the logical topology that
influences the type of network ... at any one time.
• Every node sees all the frames that are on the medium, but only the node to
which the frame is addressed processes the contents of the frame.
Học viện mạng Bách khoa - Website: ... Internetwork
45 Học viện mạng Bách khoa - Website: www.bkacad.com
Logical Topology vs Physical Topology
23
• The physical topology is an arrangement of the nodes and the physical
connections between them....
... directly impacts the quality of the printed
piece, the efficiency of the press run, and the overall
time-to-market for the new product.
FIRST 4.0
Optimization
• The goal of the optimization ... Development Team
FIRST 4.0
Internal Communication
FIRST 4.0
From Beginning to End
FIRST 4.0
Communication
• Optimization: The first step requires the
printer to analyze the printing process to ... specifications
FIRST 4.0
WOW!
14 out of 30 people answered:
“I would look for personal satisfaction in
the work I have produced”
10 out of 30 people answered:
“To be more involved in perfecting the
processes...