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Are LAN technologies in Physical Layer?
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kokonaing
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 Are LAN technologies in Physical Layer?
Previsouly, I found out that LAN technologies such as Ethernet, Token Ring and FDDI are in Data Link Layer, according to the Odom's book. But in some other documents available in the internet, it is said that they are in Physical Layer.
Even more, in techexams.net's free CCNA practice test, it says that LAN technologies are in both Physical and DataLink Layers.
Can anyone clarify this? Thanx
Ko Ko
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 07-29-03 08:06 AM
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Yankee
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07-29-03 09:54 AM
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kokonaing
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quote:
Originally posted by Yankee
up/up on an interface means up (physical)/ up (layer 2). That answer your question?
Yankee
So do u mean that LAN technologies are in both Physical and Data Link layers?
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07-29-03 10:10 AM
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asteheske
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correct me if im wrong but as afar as i Know(which is limited)
Token Ring,FDDI and Ethernet are all LAN Topology which operate at Physical Layer
Lan technologies ie.Star design,Bus and Extended Star operates @ Layer 2
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07-29-03 02:04 PM
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jason892
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I believe that the lan technologies lie at both layers. Token, Ethernet, and FDDI use different kinds of physical media, which would mean that they reside on the physical layer. They have to use the data link layer for the frame composition. In token ring, the host that has the token is allowed to transmit.
Yankee, I thought that the second up was protocol which would put it at layer 3?
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07-29-03 02:49 PM
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Yankee
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nope. First up is physical second is layer 2. In frame relay loss of LMI will down the layer 2. On ethernet you can fake it to an up/up state with the no keepalive command. On point to points loss of keepalives will give you and up/down state.
Yankee
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07-30-03 01:30 AM
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kokonaing
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So finally we cannot get to the conclusion that states whether LAN technologies are in Physical layer or Data Link layer or both.
I saw this kind of question in many practice tests like Boson, Transcender.
That kind of question is tricky. Be careful, guys!!!
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07-30-03 03:39 AM
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mgdooky
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Yes..
So are physical,I think , like FDDI.
So are Data Link , like frame relay.
So are even up to layer three...
Pls give me some distinct list of popular wan/lan technologies.
Thanks,,
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07-30-03 05:32 AM
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kokonaing
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Registered: Oct 2002
Location: Karen Land
Country: Myanmar
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Total Posts: 154
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These are distinct list of LAN and WAN tech.
LAN
Ethernet(802.3), Token Ring(802.5), FDDI
WAN
ISDN, Frame Relay, X.25, ATM, ADSL(Not covered in CCNA)
Ko Ko
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07-30-03 07:49 AM
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