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LOGO
The network interface card
 NIC or Network Adapter
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 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:
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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
LOGO
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