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•What are the three functions of a layer 2 switch? •In an organization, which function do you see as most critical, and why?
There are three distinct functions of layer 2 switching 1)address learning 2)forward/filter decisions 3)loop avoidance Address learning Layer 2 switches and bridges remember the source hardware address of each frame received on an interface, [ and they enter this information into a MAC database called a forward/filter table. Forward/filter decisions When a frame is received on an
interface, the switch looks at the destination hardware address and finds the exit interface in the MAC database. The frame is only forwarded out the specified destination port. Loop avoidance If multiple connections between switches are created for redundancy purposes, network loops can occur. Spanning Tree Protocol (STP) is used to stop network loops while still permitting redundancy. ]
Expert answered|agay18|Points 230|
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Asked 7/18/2013 5:13:01 PM
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why are math skills important to a computer science major?
Weegy: The bottom line is very simple. If you have the math - and I'm talking diffeq and applied mechanics and dynamics - you will get jobs that others cannot. [ And strangely enough, those jobs pay very, very well. Just like everyone else says, if you're content being a web programmer at a medium- to-ok salary, then forget the math. If you want a job writing control code for F22's, at a salary that can make your head spin, then consider the math as supremely important. ] (More)
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Asked 7/18/2013 5:23:33 PM
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In an organization, which function of a layer 2 switch do you see as most critical, and why?
Weegy: Layer 1, also referred to as the Physical Layer, describes the electrical interface and isn't of much interest to switch vendors. Rather it's to Layer 2 (the Data Link layer) that most switches look when deciding how to move packets around a network. [ It's here, for instance, that a switch can find the Media Access Control or MAC address of both sending and receiving devices. Layer 2 switches learn MAC addresses automatically, building a table which can be used to selectively forward packets. For example, if a switch receives packets from MAC address X on Port 1 it then knows that packets destined for MAC address X can simply be forwarded out of that port rather than having to try each available port in turn. Because Layer 2 information is easily retrieved, packets can be forwarded (switched) very quickly, typically, at the wire speed of the network. Layer 2 switching, therefore, has little or no impact on network performance or bandwidth. And because they are relatively dumb devices no setup or management is required, making them cheap and easy to deploy. What Layer 2 switches can't do is apply any intelligence when forwarding packets. They can't route packets based on IP address or prioritise packets sent by particular applications to, for example, guarantee bandwidth to Voice over IP Read more: ] (More)
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Asked 7/18/2013 6:08:44 PM
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