From: Scott Morris (swm@emanon.com)
Date: Fri Dec 07 2007 - 11:26:27 ART
You could always look at the interviewer and exclaim "Ten minutes to Judge
Wapner". :)
I bet you'd know if a jumbo packet hit you in the ass.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
joshua lauer
Sent: Friday, December 07, 2007 9:08 AM
To: Scott Vermillion; 'Jian Gu'; 'Gary Duncanson'
Cc: 'Darren Johnson'; ccielab@groupstudy.com
Subject: RE: [SPAM]Re: I know this CCIE who wouldn't know a packet if it hit
him in the ass! ~CCIE Intervie
I'm not sure if I would know if a packet hit me in the ass. I'm not sure I
would want to either...what exactly does a "packet hitting me in the ass"
entail?
I know many CCIE's who have "lost the edge" but is being an encyclopedia of
knowledge necessary to the job? the interview should be tailored for the job
being hired for, not to see if the person is rainman.
> From: scott_ccie_list@it-ag.com
> To: guxiaojian@gmail.com; gary.duncanson@googlemail.com
> CC: dazza_johnson@yahoo.co.uk; ccielab@groupstudy.com
> Subject: RE: [SPAM]Re: I know this CCIE who wouldn't know a packet if
> it
hit him in the ass! ~CCIE Interview Qs~
> Date: Thu, 6 Dec 2007 14:41:28 -0700
>
> Hey all,
>
> Certainly it's great to know what the process would be sans CEF/MLS,
> but in modern switching architectures, we aren't actually doing these
> lookups
based
> on flows or packet/frame arrival, right? My studies of CEF for the
> written caused me to look a little more deeply into this than I ever
> had
previously.
> What I recall (and what Joe's article seems to confirm) is that
> information populated into the RIB gets translated into a FIB by CEF.
> Then the adjacency table actually caches the full L2 header for each
> and every entry in the FIB.
>
> So before the first flow ever takes place, we've already
> pre-calculated not only the outgoing interface for every L3
> destination, we've also cached the outbound L2 header. This all gets
> pushed down to ASICs that essentially match on bit patterns. In other
> words, both L2 and L3 are switched down in hardware and all of this is
> set up at system boot time. Then the RP simply pushes changes in the RIB
over to CEF, which maintains the FIB.
>
> Now where I get a bit fuzzy is how QoS policy and that sort of thing
> gets inserted into the mix. I'm not a chip designer and I don't aspire to
be.
> I'm willing to take some things on faith, and this is probably one
> such thing.
>
> And I understand you too Darren! A host or another router viewing the
local
> box in question as the next hop would perform L2 encapsulation with
> the destination MAC set to that of this local box. But I still think
> that, due to CEF, in such a case we're still just dealing with a L3
> switching operation vs. a L2 switching operation.
>
> Right?
>
> Scott
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
Jian
> Gu
> Sent: Thursday, December 06, 2007 2:12 PM
> To: Gary Duncanson
> Cc: Darren Johnson; ccielab@groupstudy.com
> Subject: Re: [SPAM]Re: I know this CCIE who wouldn't know a packet if
> it
hit
> him in the ass! ~CCIE Interview Qs~
>
> Assuming MACs are leaned and ARPs are all resolved.
>
> When a frame comes in, router/switch will do both L2 and L3 lookup at
> the same time, and combine the result to make the final decision. If
destination
> MAC is router, then L2 lookup will not yield something meaningful,
> L3 lookup will come out with MAC re-write information for nexthop for
> destination IP, frame will then be routed. If destination MAC is not
router,
> this MAC must be in the vlan's dynamic MAC table, in this case, L2
> lookup will yield outgoing port, L3 lookup better come with the same
> result, this frame will be L2 switched.
>
> Jian
>
> On Dec 6, 2007 12:40 PM, Gary Duncanson
> <gary.duncanson@googlemail.com>
> wrote:
>
> > Daz,
> >
> > Yeah. Well it's getting later here in GB.
> >
> > Packet comes in..
> >
> > If the destination MAC address is that of the L3 switch, then it
> > knows about it, doesn't it just switch it out the right interface?
> >
> > If unknown..what about ARP or routing?
> >
> > Im sure you know what you mean :-)
> >
> > Gaz
> > ----- Original Message -----
> > From: "Darren Johnson" <dazza_johnson@yahoo.co.uk>
> > To: "'Gary Duncanson'" <gary.duncanson@googlemail.com>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Thursday, December 06, 2007 8:33 PM
> > Subject: RE: [SPAM]Re: I know this CCIE who wouldn't know a packet
> > if it hit him in the ass! ~CCIE Interview Qs~
> >
> >
> > > Hey Gaz, starting to like our late night chats ;-)
> > >
> > > My point was that if the destination MAC address is that of the L3
> > switch,
> > > it is to be routed. If it isn't and the receiving interface is L2
> > > then
> > it
> > > is
> > > switched/bridged.
> > >
> > > Hmmm, not sure if Im making myself clear. I know what I mean......
> > > :-)
> > >
> > > Daz
> > >
> > > -----Original Message-----
> > > From: Gary Duncanson [mailto:gary.duncanson@googlemail.com]
> > > Sent: 06 December 2007 19:50
> > > To: Darren Johnson
> > > Cc: ccielab@groupstudy.com
> > > Subject: [SPAM]Re: I know this CCIE who wouldn't know a packet if
> > > it
hit
> > > him
> > > in the ass! ~CCIE Interview Qs~
> > >
> > > Would that not be destination MAC known by the L3 switch
> > > (switched) as opposed to unknown (routed)?
> > >
> > > Is it not switched instead of bridged ;) What about those damn ASICs?
I
> > > have chatted offline with a guru who suspects CEF is the route of
> > > the
> > evil
> > > these days (no pun intended) as opposed to the MLS-SE, MLS-RP,
> > > MLSP
> > stuff
> > > and he may comment soon.
> > >
> > > You know who you are ;)
> > > ----- Original Message -----
> > > From: "Darren Johnson" <dazza_johnson@yahoo.co.uk>
> > > To: "'Gary Duncanson'" <gary.duncanson@googlemail.com>; "'Jian Gu'"
> > > <guxiaojian@gmail.com>
> > > Cc: <ccielab@groupstudy.com>
> > > Sent: Thursday, December 06, 2007 7:28 PM
> > > Subject: RE: I know this CCIE who wouldn't know a packet if it hit
> > > him
> > in
> > > the ass! ~CCIE Interview Qs~
> > >
> > >
> > >> IMHO, if the destination MAC is owned by the L3 switch, then it
> > >> needs
> > to
> > >> be
> > >> routed. If the destination MAC is not owned by the L3 switch, it
> > >> can either bridge it (if the device is located on another
> > >> interface) or drop it
> > (if
> > >> the
> > >> device is located on the same interface the frame was received on).
> > >>
> > >> Dazzler
> > >>
> > >> -----Original Message-----
> > >> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > >> Behalf
Of
> > >> Gary
> > >> Duncanson
> > >> Sent: 06 December 2007 17:51
> > >> To: Jian Gu
> > >> Cc: ccielab@groupstudy.com
> > >> Subject: Re: I know this CCIE who wouldn't know a packet if it
> > >> hit him
> > in
> > >> the ass! ~CCIE Interview Qs~
> > >>
> > >> Sounds like the route once switch many thing to me from MLS studies..
> > >>
> > >> Gary
> > >> ----- Original Message -----
> > >> From: "Jian Gu" <guxiaojian@gmail.com>
> > >> To: "Sohail Nedaria" <sohail.nedaria@gmail.com>
> > >> Cc: "ccie ccie" <cciefun@gmail.com>; "Narbik Kocharians"
> > >> <narbikk@gmail.com>; "Cisco certification"
> > >> <ccielab@groupstudy.com>
> > >> Sent: Thursday, December 06, 2007 6:54 AM
> > >> Subject: Re: I know this CCIE who wouldn't know a packet if it
> > >> hit him
> > in
> > >> the ass! ~CCIE Interview Qs~
> > >>
> > >>
> > >>> Sure, here is one I like,
> > >>>
> > >>> How does a L3 switch router know when to L2 switch an incoming
> > >>> frame
> > and
> > >>> when to L3 switch an incoming frame?
> > >>>
> > >>> On Dec 5, 2007 10:00 PM, Sohail Nedaria
> > >>> <sohail.nedaria@gmail.com>
> > >>> wrote:
> > >>>
> > >>>> Hi Guys
> > >>>>
> > >>>> Can you guys provide me CCIE Interview questions
> > >>>> so i
> > can
> > >>>> also prepare my self well before i take on any interview.
> > >>>>
> > >>>> Thanks
> > >>>> Suhail
> > >>>> CCIE#19337
> > >>>>
> > >>>>
> > >>>> On 12/6/07, ccie ccie <cciefun@gmail.com> wrote:
> > >>>> >
> > >>>> > Hi,
> > >>>> >
> > >>>> > I am going off bit, but like to share something with you.
> > >>>> >
> > >>>> > I gave lots of interview include CISCO, Google, Yahoo......no
> > >>>> > end
&
> > i
> > >>>> gave
> > >>>> > with out any interest to join but to test myself :). I gave
> > >>>> > interview
> > >>>> for
> > >>>> > small to big organization & i found you can't impress the
> > interviewer
> > >>>> only
> > >>>> > by your techniqual knowledge.
> > >>>> >
> > >>>> > Thing to impress them as per my understanding are as.
> > >>>> >
> > >>>> > 1. Good Techniqual Approach
> > >>>> > 2. If you dont know say you dont know this time, but you will
learn
> > &
> > >>>> find
> > >>>> > the answer.
> > >>>> > 3. Good troubleshooting approach (In network always answer
> > >>>> > withh
> > >>>> refrance
> > >>>> > to
> > >>>> > OSI layer)
> > >>>> > 4. Listen interviewer carefully take own time to think &
> > >>>> > answer 5. Never underestimate interviewer who knows what the
> > >>>> > other side person is.
> > >>>> > 6. Respect interviwer & appreciate him for some good question.
> > >>>> > 7. Before go to the interview do your study about the
oganization.
> > >>>> > 8. Last be not least. Give an impression that you respect the
> > >>>> organization
> > >>>> > lot, you will love to work for them, you will give longer
> > association
> > >>>> > &
> > >>>> > your
> > >>>> > placement in organization will contributing lot to generate
> > revenue.
> > >>>> >
> > >>>> > Dont forget final interview is always by the management people.
> > >>>> >
> > >>>> >
> > >>>> > Regards,
> > >>>> > Mike
> > >>>> >
> > >>>> >
> > >>>> >
> > >>>> > On 12/6/07, Narbik Kocharians <narbikk@gmail.com> wrote:
> > >>>> > >
> > >>>> > > Darth, Are you a CCIE? I don't see your number. But what
> > >>>> > > would
> > you
> > >>>> hate
> > >>>> > to
> > >>>> > > be asked in the interview? that's the question i would ask.
> > >>>> > > I would ask him/her what are your weak points and what are
> > >>>> > > your strong points. Go from there.
> > >>>> > > Talk to him/her about some of the problems that your firm
> > >>>> > > had
and
> > >>>> > > see
> > >>>> > > what the person responds, but don't expect the poor CCIE to
solve
> > >>>> > > it
> > >>>> for
> > >>>> > > you
> > >>>> > > in a second. But he/she should have an idea as to where to
> > >>>> > > look, from
> > >>>> > that
> > >>>> > > you should know the depth of his/her knowledge.
> > >>>> > > If you or the interviewer is experienced enough, the second
> > >>>> > > this
> > >>>> person
> > >>>> > > opens his/her mouth, you should know the depth of his
knowledge.
> > >>>> > >
> > >>>> > > But once again, CCIEs are not gods, they can have a bad day
> > >>>> > > as well.
> > >>>> > > I
> > >>>> > > personally like to focus on the person's attitude and
> > personality,
> > >>>> > > obviously
> > >>>> > > he/she got the CCIE cert, which means that the person
> > >>>> > > either
> > knows
> > >>>> > > or
> > >>>> > knew
> > >>>> > > the stuff and can easily pick up the info.
> > >>>> > >
> > >>>> > >
> > >>>> > > My 2 Cent.
> > >>>> > >
> > >>>> > > On 12/5/07, darth router <darklordrouter@gmail.com> wrote:
> > >>>> > > >
> > >>>> > > > Ok guys,
> > >>>> > > >
> > >>>> > > > there was a thread a while back talking about dumbass CCIE's.
> > As
> > >>>> > > > I
> > >>>> > > prefer
> > >>>> > > > not to be the dumbest CCIE on the planet, help me out
> > >>>> > > > with questions
> > >>>> > > that
> > >>>> > > > you might ask a CCIE candidate in an interview. I have
> > >>>> > > > had
some
> > >>>> brutal
> > >>>> > > > interviews since I became IE. Honestly the questions seem
> > >>>> > > > a
bit
> > >>>> basic
> > >>>> > so
> > >>>> > > > far, but I have had some really in depth questions about
> > >>>> > spanning-tree,
> > >>>> > > > troubleshootin real world EIGRP scenarios, etc.. that
> > >>>> > > > really caught
> > >>>> me
> > >>>> > > off
> > >>>> > > > guard. It's not that I could not have solved these
> > >>>> > > > issues, had
> > I
> > >>>> been
> > >>>> > > > there
> > >>>> > > > logged into the routers, its explaining things we take
> > >>>> > > > for granted
> > >>>> can
> > >>>> > > be
> > >>>> > > > tough, especially in interviews. It seems like a lot of
> > >>>> > > > people are amazed that a CCIE couldn't answer this or
> > >>>> > > > that question.
> > >>>> > > > Personally, I am trying to come up with a knowledge
maintanance
> > >>>> plan,
> > >>>> > > > like reading a chapter in the exam cert guide every week.
> > >>>> > > > The tasks
> > >>>> I
> > >>>> > > > do not do on a daily basis fade quickly.
> > >>>> > > >
> > >>>> > > >
> > >>>> > > > I have of late been going way back to basics, reading up
> > >>>> > > > on TCP/IP
> > >>>> > > flows,
> > >>>> > > > Ethernet, ARP, looking at packet sniffing traces, etc..
Someone
> > >>>> > > > made
> > >>>> > > > mention
> > >>>> > > > of the CAM table populating entries, so I read up on that
too.
> > >>>> > > >
> > >>>> > > > I certainly don't know everything, but I would love to.
> > >>>> > > > Care
to
> > >>>> > > > give
> > >>>> > me
> > >>>> > > > some
> > >>>> > > > example questions you might ask a CCIE in an interview,
> > >>>> > > > or
> > >>>> > technologies
> > >>>> > > > you
> > >>>> > > > would expect to have him/her to have down pat?
> > >>>> > > >
> > >>>> > > > DR
> > >>>> > > >
> > >>>> > > >
> > >>>> >
> > > __________________________________________________________________
> > > _____
> > >>>> > > > Subscription information may be found at:
> > >>>> > > > http://www.groupstudy.com/list/CCIELab.html
> > >>>> > > >
> > >>>> > >
> > >>>> > >
> > >>>> > >
> > >>>> > > --
> > >>>> > > Narbik Kocharians
> > >>>> > > CCIE# 12410 (R&S, SP, Security) CCSI# 30832
> > >>>> > > www.MicronicsTraining.com Sr. Technical Instructor
> > >>>> > > www.Net-WorkBooks.com
> > >>>> > >
> > >>>> > >
> > >>>>
> > ____________________________________________________________________
> > ___
> > >>>> > > Subscription information may be found at:
> > >>>> > > http://www.groupstudy.com/list/CCIELab.html
> > >>>> >
> > >>>> >
> > > __________________________________________________________________
> > > _____
> > >>>> > Subscription information may be found at:
> > >>>> > http://www.groupstudy.com/list/CCIELab.html
> > >>>> >
> > >>>>
> > >>>>
> > >>>>
> > >>>> --
> > >>>> Thanks And Regards
> > >>>> Suhail.U.Nedaria
> > >>>> 9833256425
> > >>>> CCIE# 19337.
> > >>>>
> > >>>>
> > ____________________________________________________________________
> > ___
> > >>>> Subscription information may be found at:
> > >>>> http://www.groupstudy.com/list/CCIELab.html
> > >>>
> > >>>
> > ____________________________________________________________________
> > ___
> > >>> Subscription information may be found at:
> > >>> http://www.groupstudy.com/list/CCIELab.html
> > >>
> > >>
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