Re: Little Johnny has some ospf questions for ccie students.

On Sat, Nov 14, 2009 at 11:30 AM, Tom Solski <tom.solski_at_gmail.com> wrote:

> See inline below for what I found from the top of my head
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Johnny B CCIE
> Sent: 14-Nov-09 02:27
> To: groupstudy
> Subject: Little Johnny has some ospf questions for ccie students.
>
> These tasks are random rumblings from some various notes I am labbing
> over tonight. Please don't flame me. I have to ask as some people here
> are terribly rude. I am a ccie candidate who has to take a lab and I
> am going to post study questions for myself and other students to
> discuss. People with ccies should disregard if this is offensive. I
> have a simple bet to win despite the lab changes.
>
> 1. In area 0, use an ospf network type that will force a dr/bdr
> election but will use a unicast packet for hello and database
> exchange.
>
ANS: use nbma mode and use neigh cmd on central router

>
> 2. Advertise a loopback is ospf but do not add it to any given area.
> It must show up in a routing table as E2.
>
> ANSWER: redistribute with "redistribute connected" and not with "network"
> command.
>
> 3. The devices in vlan j should become adjacent if and only if they
> use the clear test string of (jb?ccie?).
>
-if>ip ospf authentication

>
> 4. If there is no area 0 is ospf devices can ospf devices communicate? Why?
>
> ANSWER: Yes. Within the area. See recent posts on groupstudy regarding
> non-area0 network
>
Ans: BB area is required to connect two or more ospf areas.
 I would like to test if a router with two ospf processes can be a member of
two non-zero areas and redistribute may work?

>
> 5. Can you inject an ospf prefix into an ospf area without associating
> that prefix to an ospf area? How?
>
> ANSWER: that ia a bit vague for me. What you mean "not associating". Is
> that
> a tech term ? Even an external route was redistributed in some area so it
> could be considered as associated with it. I would say just redistribute it
> as external route.
>
> 6. How would you advertise 10.20.40.0/22 as area 40 in ospf if you
> could not add it directly under the ospf process?
>
> ANSWER: Advertise it under interface.
>
> 7. How would you make 10.10.10.0 appear in area 10 as external Type 1?
>
> ANSWER: On ASBR redistribute thru a route-map. In router map match ip
> address and then set route type to type-1
>
> 8. If asked to not allow external routing information into area 10 how
> can you do this without using any filtering?
>
> ANSWER: area X nssa no-summary. External routes will be still accessible
> via
> default gateway injected by ABR.
>
Ans: if asking about type-5 then stub, total stub, nssa, total nssa.

>
> 9. In which case would you use a nssa over a stub area in ospf, explain?
>
> ANSWER: NSSA if there is an external network attached to that area.
>
Ans: if we need to accomodate external routes withoue type-5 LSAs.

>
> 10. If asked to not elect a dr between two routers how many ways might
> you accomplish this?
>
Ans: P2P, P2M network types.

>
> 11. If told to allow any external routing information into area 20 how
> many ways can you do this?
>
> ANSWER: I am not getting this. If there are already external routes in the
> domain they will be accessible from everywhere.
>
Ans: redistribution on ASBR, ABR in nssa also converts type-7 to type-5,
default-info is also type-5 in normal areas?

>
> 12. What is the default network type on a frame relay network using
> physical interfaces? How would you modify the dr and if required to
> have a dr?
>
Ans:NBMA, change DR by "ip ospf priority #" and use neigh cmd for adj.

>
> 13. Can you configure ospf across a virtual-link? If so, how?
>
Ans: not sure about question, virtual is link is already part of area 0. if
using tunnel then use them like ordinary interfaces.

>
> 14. If asked to reduce the flooding and refreshing of the lsa in an
> ospf domain how would you accomplish this?
>

>
> ANSWER: max-lsa command under ospf process.
>
> 15. If asked to take a full frame relay mesh and configure ospf over
> it so that if one or two but not more than two pvcs should fail then
> all ospf adjacencies should be retained how many ways can we do this?
>
Ans: p2m,

>
> 16. If asked to advertise 10.12.20.0, 10.13.20.0 and 10.14.20.0 into
> an area using the most efficient mask how would you configure it? What
> other information if any might you need? What are your possible
> options?
>
Ans: 10.12.20.0 255.254.0.0 & 10.14.20.0 separately.

>
> 17. If asked that a loopback should be learned by other routers with
> its original mask length how many ways can this be done?
>
Ans: ip ospf net p2p, redis conn route-map abc & match interface lo0.

>
> ANSWER: ip ospf network point-to-point
>
> 18. On a frame relay hub and spoke topology R1, R2, and R3 with R1 as
> the hub if asked to use a network type that elects a DR but does not
> use require a neighobr statement how would you configure this?
>
Ans: broadcast type

>
> 19. If asked to detect the loss of a neighbor twice as fast as the
> default on a point-to-point link, a frame relay network link, and on
> an ethernet link how would you configure each?
>
Ans: reduce the hello-interval to half

>
> 20. If asked to add a loopback to area 5 how can you do this if you
> are not allowed to use a network statement or redistribute connected?
>
Ans; -IF> ip os # area 5

>
> ANSWER: under interface: ip ospf X area 5
>
> 21. How do you solve a reachability problem if a host route is
> generated by ospf?
>
Ans: Host routes in ospf are generated through using loopback or P2M, not
sure what is the question.

>
> 22. Are non-area 0 paths preferred over area 0 paths? What if a
> virtual-link is used?
>
Ans: intra, inter area, E1, E2, Moreover, if a route learned form BB and the
same one from non-BB then route from BB is prefered.

>
> 23. What multicast address does a point to multipoint network type use?
>

> 24. If asked to form an adjacency with a peer that does not possess a
> physical connection with another peer can this be done and if so can
> you show me a configuration with how you did it?
>
Ans: tunnel interface

>
> 25. How do you configure an ospf router to log adjacency changes?
> Ans: log neigh adj
>

> 26. How do you configure an ospf router to report names when doing a
> show ip ospf database command?
> Ans: conf>ip os name-lookup
>

>
> 27. How do you configure ospf hello interval to be 1/4 of a second to
> provide fast convergence?
>
> ANSWER: ip ospf dead interval with minimal argument ....
>
> 28. If asked to not limit retransmissions of database exchange and
> hello packets how can you do this?
>
> 29. How can you configure an ospf domain to originate maximum
> link-state metrics for all non-stub links?
>
Ans: max metric lsa

>
> 30. If asked to redistribute any given loopback into any given area as
> connected and then ensure it maintains its default metric type how
> would you do this?
> Ans: not sure what is the question, redistri conn route-map abc ,
> metric-type is E2 by default else we can set in route-map
>
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Received on Sun Nov 15 2009 - 21:05:14 ART