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volleyballbeginnerNetworking and Communications

Oct 27, 2013 (4 years and 13 days ago)

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The network interface card


NIC or Network Adapter


This device provides the physical, electrical,
and electronic connections to the network
media



NIC connects to the computer through
expansion slots

or built in to the
motherboard of the computer


Features


Data transmission network


Sends data to another computer in the form of bits 0 and 1.


Control data flow between computer and cable systems


Equipment is operating at the physical layer

HUB

Features


Any transmission received on one port will
be rebroadcast to all the other ports in the
hub.


Equipment is operating at the physical layer

Switch


Connects multiple segments of a network together
.


Rebroadcasts anything it
receives on one port to all
the others
.


The benefit of a switch over a hub is that the switch
increases performance because it doesn’t suffer
from the wasted bandwidth of the extra
transmissions.

Bridge

Bridge


Network device that connects two similar
network segments together.


The primary function of a bridge is to keep
traffic separated on both sides of the bridge.


Router

Example for VPN


Virtual: Information within a private network is transported

over a public network.


Private: The traffic is encrypted to keep the data confidential.

Features


A network device that connects multiple,
often dissimilar, network segments into an
internetwork.



Can make intelligent decisions about how
best to get network data to its destination


All routers can:


Connect dissimilar networks


Interpret Layer 3 addressing and other information


Determine the best path for data to follow


Reroute traffic


Gateways


Gateway allow connection types protocols together


For example:


Network of you use protocol IP Network and other network
use a protocol IPX, Novell, DECnet, SNA ... or any protocol
that you will Gateway convert from this type protocol to them
“talk” together.

MODEMS


MODEM


MOdulation
-
DEModulation

MODEMS


A modem is a device that changes digital
data into an analog form for transmission
over an analog medium and then back to
digital again at the receiving end.

CSU/DSUs

CSU/DSUs


The Channel Service Unit/Data Service Unit
(CSU/DSU) is a common device found in
equipment rooms when the network is
connected via a T
-
series data connection

Summary

LAYER

DEVICES

Application, Presentation, Session

No

Transport

No

Network

Router

Data link

Bridges, Intelligent hubs

Physical

NIC, Repeater,
Concentrator, Hub,
connector, MODEM

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