Are you sure they weren't lying about their status? Did you see the leather
jacket?
I've meet several people over the years who are CCIE's until you ask for
some documentation, and then you never see them again.
- Dennis
-----Original Message-----
From: Ledwidge, Feargal [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, August 22, 2000 4:09 PM
To: [EMAIL PROTECTED]
Subject: RE: Is a TCP packet encapsulated by a IP packet which is inside
a Layer 2 frame?
You think thats bad ..... ?
I worked with a CCIE who couldn't perform a simple traceroute ! Yet he
managed to pass the lab !
Feargal
-----Original Message-----
From: Phil Barker [mailto:[EMAIL PROTECTED]]
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>>
>
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