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Disadvantages
You typically would not use a packet filter as your only security solution for your network packets filters have two major disadvantages.
a.Low security : Packet filters do not look at eh data portion of the packets so attacks can flow right through them.
b.No advanced protocol support : Since these filters do not keep track of connection there is no way to support dynamic protocols .
Can you define Network Layer?
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Virtual channel is normally a link from one source to one destination, although multicast connections are also allowed. The other name for virtual channel is virtual circuit.
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