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Network Devices

August 7, 2009
ᅡᄋ An unintelligent network device that sends one signal to all of the stations connected to it.
ᅡᄋ All computers/devices are competing for attention because it takes the data that comes into a port and sends it out all the other ports in the hub.
ᅡᄋ Traditionally, hubs are used for star topology networks, but they are often used with other configurations to make it easy to add and remove computers without bringing down the network.
ᅡᄋ Resides on Layer 1 of the OSI model
ᅡᄋ Split large networks into small segments, decreasing the number of users sharing the same network resources and bandwidth.
ᅡᄋ Understands when two devices want to talk to each other, and gives them a switched connection
ᅡᄋ Helps prevent data collisions and reduces network congestion, increasing network performance.
ᅡᄋ Most home users get very little, if any, advantage from switches, even when sharing a broadband connection.
ᅡᄋ Resides on Layer 2 of the OSI model.
ᅡᄋ Connects two LANs and forwards or filters data packets between them.
ᅡᄋ Creates an extended network in which any two workstations on the linked LANs can share data.
ᅡᄋ Transparent to protocols and to higher level devices like routers.
ᅡᄋ Forward data depending on the Hardware (MAC) address, not the Network address (IP).
ᅡᄋ Resides on Layer 2 of the OSI model.
ᅡᄋ Used to boost the signal between two cable segments or wireless access points.
ᅡᄋ Can not connect different network architecture.
ᅡᄋ Does not simply amplify the signal, it regenerates the packets and retimes them.
ᅡᄋ Resides on Layer 1 of the OSI model.
ᅡᄋ A device that connects any number of LANs.
ᅡᄋ Uses standardized protocols to move packets efficiently to their destination.
ᅡᄋ More sophisticated than bridges, connecting networks of different types (for example, star and token ring)
ᅡᄋ Forwards data depending on the Network address (IP), not the Hardware (MAC) address.
ᅡᄋ Routers are the only one of these four devices that will allow you to share a single IP address among multiple network clients.
ᅡᄋ Resides on Layer 3 of the OSI model.
ᅡᄋ A firewall is software or hardware or a combination of both.
ᅡᄋ It prevents unauthorized users to access to or from a private network
ᅡᄋ Enforces an access control policy between two networks
ᅡᄋ Determines which services can be accessed from the outside       and vice versa
ᅡᄋ Designed to block hackers
ᅡᄋ Screens outgoing traffic to limit Internet use

ᅡᄋ Hides information about the network so that it seems that all the traffic originates from the firewall rather than the network (hardware)

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