Well, it is and it isn't... She did do another edition of the book. I did once work with a CCIE who failed his re-cert exam like 4 or 5 times in a row. He kept taking it without preparing at all... >From: "Chuck Larrieu" <[EMAIL PROTECTED]> >Reply-To: "Chuck Larrieu" <[EMAIL PROTECTED]> >To: "Phil Barker" <[EMAIL PROTECTED]>, "Priscilla >Oppenheimer" <[EMAIL PROTECTED]>, "Derek CHUNG" ><[EMAIL PROTECTED]>, <[EMAIL PROTECTED]> >Subject: RE: Is a TCP packet encapsulated by a IP packet which is inside a >Layer 2 frame? >Date: Wed, 23 Aug 2000 20:40:18 -0700 > >My only CCIE story is the CCIE who spotted me reading Radia Perlman's >Interconnections, and advised me not to waste my time because "it was >outdated" :-> > >Chuck > > > >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of >Phil >Barker >Sent: Tuesday, August 22, 2000 5:33 AM >To: Chuck Larrieu; Priscilla Oppenheimer; Derek CHUNG; [EMAIL PROTECTED] >Subject: RE: Is a TCP packet encapsulated by a IP packet which is inside a >Layer 2 frame? > >I met a CCIE 3 years ago who confirmed that he >understood that ICMP was used for Ping request/reply >??? but nothing else. > >Scarrrrrrrrrrry. > >PS: I'm not tarring all CCIE's with the same brush. >But exams are exams at the end of the day. > >Phil. > > >--- Chuck Larrieu <[EMAIL PROTECTED]> wrote: > >-----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED]] On Behalf Of > > Priscilla Oppenheimer > > Sent: Monday, August 21, 2000 10:35 AM > > To: Derek CHUNG; [EMAIL PROTECTED] > > Subject: Re: Is a TCP packet encapsulated by a IP > > packet which is inside a > > Layer 2 frame? > > > > <<snip>> > > > > Now Chuck said that nobody could rattle off header > > contents off the top of > > their head. I'm going to see if I can. &;-) > > > > CL: I believe I asked ( rhetorically ) how many > > could do what you did so > > well without referring to a chart or some other > > source. I think even Howard > > admitted he cannot do so at present? ( even if he > > was able to at one time ) > > > > IP > > Version > > Header Length > > Type of Service -- precedence, etc. > > Length of Packet > > ID -- all fragments have the same ID > > Flags -- don't fragment, more fragments > > Fragment Offset -- indicates the position of this > > data relative to the > > beginning of a fragmented message > > Time to Live -- decremented by each router until it > > reaches 0, in which > > case the packet is trashed > > Protocol -- next layer up, for example, UDP, TCP, > > EIGRP, OSPF, ICMP, etc. > > Header checksum > > Source IP Address > > Destination IP Address > > Options -- record route, source routing, etc. > > Padding if necessary -- must end on a 32-bit > > boundary > > > > CL: agrees with the source I am checking this > > against > > > > TCP > > Source Port > > Destination Port > > Sequence Number -- each BYTE is sequenced. This > > field specifies the seq # > > of the first byte in this message > > ACK Number > > Header Length > > Flags - Urgent, ACK, PUSH, RESET, SYN, FIN > > Window Size > > Checksum - checksum of header and data > > Urgent Pointer -- points to any urgent data in the > > message > > Options > > > > CL: WOW!!! > > > > Whew! Did it! &;-) > > > > CL: yes you did, PO, and therefore you are entitled > > to ask the rest of us > > how we ever got such and such a certification > > without knowing this ;-> > > Still wondering how many CCIE's are unable to > > duplicate your feat. :-> > > > > Priscilla > > > > > > > > At 03:59 AM 8/20/00, Derek CHUNG wrote: > > >Is a TCP packet (layer 4) encapsulated by a IP > > packet (layer 3) which is > > >inside a Layer 2 frame? > > >If so, why the headers of a IP packet and TCP > > packet look so similar and > > >redundant? > > > > > CL: I also believe that this premise remains untrue. > > While both IP and TCP > > headers are normally 20 bytes, I see very little > > else in common, as > > befitting the very different functions they perform. > > TCP has more > > reliability functions built in - acknowledgement, > > windowing, etc. whereas IP > > is more oriented towards best effort delivery across > > an internet. > > >___________________________________ > > <<snip>> > > > > ___________________________________ > > 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] > > >____________________________________________________________ >Do You Yahoo!? >Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk >or your free @yahoo.ie address at http://mail.yahoo.ie > >___________________________________ >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] > >___________________________________ >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] ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.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]
