TCP or UDP ?

Just want to ask youy guys regarding the WAN Protocols, I'm wondering what type of L4PDU does HDLC, Frame Relay and ATM use. Is it TCP or UDP.

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Ten9t6

I am not sure what you are asking here. Those WAN protocols are Layer 2. They do not care about the layers above them. It is all encapsulated into a layer 2 frame and then thrown onto the wire as bits.

Encapsulation

Data Layer 7, 6, 5
Segment Layer 4
Packet Layer 3
Frame Layer 2
Bits Layer 1

Check out chapter 3

http://www.daltonstate.edu/faculty/tfaulk/STUDY%20GUIDE1.pdf

Let me know if this doesn't answer your question.

chinaman

Thanks actually I read I forgot what book if it's sybex or press that CDP uses UDP protocols or maybe I've already mixed all things in my mind like CDP is also a multicast. grrr..... See what happen guys if you read to much you.

crap I forgot my old pwd

CDP runs on all meadis that supports SNAP headers. Any LAN, HDLC, Frame Relay, and ATM interface. CDP is not dependant on any layer protocol higher than Data Link Layer. So in the case of CDP, TCP and UDP do not matter. Maybe this helps.

Ten9t6

CDP can cross Frame Relay and ATM...so your right about that.

Check this out:

http://www.netcraftsmen.net/welcher/papers/cdp.htm

chinaman

Thanks for that info

crap I forgot my old pwd

hey thanks! nice link! And btw (off topic) Kenny, how is the CCIE lab coming along?

Ten9t6

crap I forgot my old pwd wrote:

hey thanks! nice link! And btw (off topic) Kenny, how is the CCIE lab coming along?

Its coming...I have some more material to go through...I will be posting a review soon.

Kenny