| Network Component |
Functions |
OSI Model |
|
Network Adapter |
converts a computer message into
electrical/optical signals for transmission across a network. |
Physical (Layer 1) |
|
Modem (Modulator demodulator) |
puts a message (baseband signal) on
a carrier for efficient transmission; takes the baseband signal from the carrier. |
Physical (Layer 1) |
|
Repeater (Regenerator) |
receives signal, amplifies it, then retransmits it. |
Physical (Layer 1) |
|
Bridge |
connects networks with different
Layer 2 protocols; divides a network into several segments to filter traffic. |
Data Link (Layer 2) |
|
Hub |
connects computers in a network;
receives a packet from a sending computer and transmits it to all other computers. |
Physical (Layer 1) |
|
Switch |
connects computers in a network;
receives a packet from a sending computer and transmits it only to its destination. |
Data Link (Layer 2) |
|
Access Point |
connects computers in a wireless
network; connects the wireless network to wired networks; connects it to the Internet. |
Data Link (Layer 2) |
|
Router |
forwards a packet to its
destination by examining the packet destination network address. |
Network (Layer 3) |
|
Residential Gateway |
connects a home network to the
Internet; hides all computers in the home network from the Internet. |
Network (Layer 3) |
|
Gateway |
connects two totally different
networks; translates one signaling/protocol into another. |
All layers |
