The Cisco Press CCDA Certification Guide by Bruno and KIM, is great study for the exam, and the only book I have for that exam. But as far as answering Tony's SDLC question, there is a half a sentence reference to SDLC on page 535, total. For the answer to his particular question I had to look in Internetworking Technologies Handbook. The three protocols would be 802.2, HDLC, and QLLC, pages 215-222. Looks like something that someone on the SNA/IP CCIE track would have to be into heavy, or at least familiar with for CCIE R.& SW. HTHs Dale ----Original Message Follows---- From: "GNOME" <[EMAIL PROTECTED]> Reply-To: "GNOME" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Subject: Re: CCDA,failed... Date: Mon, 4 Sep 2000 23:50:44 +0800 passed CCDA yesterday !!!study the CCDA Exam Certification Guide. It is a great help to me as alot of info are from there!!!! "tony yj" <[EMAIL PROTECTED]> wrote in message 8ovndj$v1r$[EMAIL PROTECTED]">news:8ovndj$v1r$[EMAIL PROTECTED]... i failed CCDA this afternoon with a score of 679. i've never seen the questions before. question exp: the three ptotocols for SDLC: 802.2,QLLC,SIP,HDLC...... how can i know that? i need your help really!!! sadly TONY _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. ___________________________________ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]