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nigosawa
Joined: 21 Dec 2006
Posts: 25
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 03 Jan 2007 14:30 data link layer |
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hi
i want to ask is data link layer only used on LANs?....as i read in a book that when a packet is transfered from one router to another it is in network packet format. and when it reaches a LAN on which the destination computer is attached, the router encapsulates it in a data link layer frame
please elaborate
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manish12
Joined: 21 Nov 2006
Posts: 963
Helped: 29
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| 05 Jan 2007 12:14 Re: data link layer |
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| it is used in any network.
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Enhancer
Joined: 09 Dec 2006
Posts: 57
Helped: 3
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| 07 Jan 2007 10:28 Re: data link layer |
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The meaning is come from a fact that:
Switch, can encapsulate the data up to layer 2 "DATA Link Layer"
Router, can encapsulate the data up to layer 3 "Network Layer"
and so,
on the level of the LAN, the only needed is "switch", which means that the devices in the LAN will read from Layer 1 up to only Layer 2. which yields to usage only of the first two layers in the OSI model in the LAN.
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III
Joined: 11 Feb 2006
Posts: 338
Helped: 41
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| 18 Jan 2007 10:33 data link layer |
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The data link is the second layer in ISO-OSI (Open System Interconect) and egsists in every communication systems, not just 802.3 lans.
Actualy not all of the 7 layers of the osi have to egzist in a communication system but the lower layers allmost allways egzist.
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