From: Jian Gu (guxiaojian@gmail.com)
Date: Thu Dec 06 2007 - 18:12:12 ART
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
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >>
> >>
> >>
> >> ___________________________________________________________
> >> Does your mail provider give you FREE antivirus protection?
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> >>
> >
> >
> >
> > ___________________________________________________________
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>
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