... 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 ... become the mainstay of Microsoft
networking.
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Chapter 3 - Application Layer
Functionalityand Protocols
CCNA Exploration4. 0CCNA Exploration4. 0
DNS ... term
connection to servers. Once the connection is established, the user of the
client can access the resources on the server as if the resource is local to the
client host.
• SMB file-sharing...
... 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...
... 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 ... Patch cords connects between the patch panels and the intermediary
devices. Patch cables also interconnect these intermediary devices.
• Also contains the servers used by the network.
Horizontal ... 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...
... data link features of Ethernet.
• Describe the function and characteristics of the media access
control method used by Ethernet protocol.
• Explain the importance of Layer 2 addressing used for ... protocols along the way,
the Layer 2 address it receives each time applies only to
that local portion of the journey and its media.
In short:
• The Network layer address enables the packet to ... Access Control (MAC) is the lower Ethernet sublayer of the
Data Link layer. MAC is implemented by hardware, typically in the
computer Network Interface Card (NIC).
• The Ethernet MAC sublayer...
... of the communication process, the user data
has been segmented by the Transport layer, placed into
packets by the Network layer, and further encapsulated as
frames by the Data Link layer. The ... Network Media
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Chapter 8 - OSI Physical Layer
CCNA Exploration4. 0CCNA Exploration4. 0
Học viện mạng Bách khoa - Website:
www.bkacad.com
Characteristics ... - Operates in the2 .4 GHz frequency band, speed up to
54 Mbps. Devices implementing this standard therefore operate at the
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54 Mbps. Devices...
... 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....
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