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Month: November 2013

Address Resolution Protocol (ARP)

Used in Layer 2, an ARP’s goal is to find the MAC address of a host, given the IP address. If the sender knows the host is on the same subnet, it’ll send the ARP request, once it receives a response, it’ll have...

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VLANs Introduction

You can think of VLANs as segmenting a switch into multiple networks. Each port could belong to a different VLAN. Contrary to what some believe, VLANs should not be a security mechanism. The bridge table can be flooded and...

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Ethernet Switches

Used to be called “bridges.” Recall that there are really three types of network equipment: Hubs/Repeaters – Layer 1 devices that just forward everything blindly, including collisions/errors. Bridges/Switches...

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