From: Jason Sinclair (sinclairj@xxxxxxxxxxxxxxx)
Date: Fri Jun 14 2002 - 00:48:11 GMT-3
Kris,
Some answers/thoughts are in-line below.
Cheers,
Jason Sinclair CCIE #9100
Manager, Network Control Centre
POWERTEL
55 Clarence Street,
SYDNEY NSW 2000
AUSTRALIA
office: + 61 2 8264 3820
mobile: + 61 416 105 858
email: sinclairj@powertel.com.au
-----Original Message-----
From: kris.keen@aon.com.au [mailto:kris.keen@aon.com.au]
Sent: Friday, 14 June 2002 12:54
To: ccielab@groupstudy.com
Subject: Few Questions
Hi All,
This may be a bit of the topic but I'd appreicate the help.
1) Whats the advantage of secondary addressing, design problems,
implementation problems, how do routing protocols handle this?
Issue with OSPF is that it does not run on secondaries.
Usually used for migration, LAN extension ,etc. Generally not a good design
practice.
2) how many bytes are using in mppp frames for seq and reassembly
As per RFC 1990 there is 4 bytes assigned for sequencing.
3) D channel uses out of band signling for BRI/PRI implementations, does B
channels use in band? I just need to be clear
The D-Channel is actually the OOB signalling channel for the
B channels.
4) I understand that STUN with Direct encapsulation is the fastest method,
is this correct? i believe this provides no error recovery like TCP
Rather than saying fastest, it would be better to say it is
more efficient as there is less overhead. That said, there is no error
recovery mechanism and you cannot re-route around failures, etc.
5) a larger X25 window size will allow x25 to be more efficent?
Generally yes, however X.25 was designed to be very reliable
with a lot of in-built error checking mechanisms. Thus on noisy or dirty
lines a larger window size may actually reduce performance as there is more
data to retransmit in a failure.
6) how do routing protocols work with the NBMA problem on Frame Relay, as I
understand it the broadcast keyword enables broadcasts to be forwared
across Frame Relay allow routing protocols to work.
Again, generally yes.
These are in relation to the CID exam I just failed. I believe these are
points I need to know and I wasnt too clear on. Very badly worded exam,
would appreicate some assistance.
Regards
-----------------------------------------------------------------
Kris Keen - CCDA, CCNP, CNE
Network Support Specialist - Network Systems
Aon Risk Services Australia Limited
(612) 9253 7272
0404862970
E: Kris.Keen@aon.com.au
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