Chuck,
I agree that problems like this do provide practice in masking.
Let's make very sure, however, not to give the impression that
minimizing the number of statements -- definitely OSPF network, and
arguably access lists -- is a good idea for the real world.
Consider the situation when one is called in, at 3AM, to troubleshoot
a mission-critical network. And, as you look at the configuration in
the routers having problems, you find nothing but "cute" statements,
with no documentation.
Personally, I make a point of having one OSPF network statement for
each interface I want to speak OSPF. Much easier to understand, and
there is no performance advantage to having a lesser number of
statements.
Even with access lists, I don't try to minimize except when I am
facing a real performance problem that can't be solved any other way.
The original Sprint access list that imposed their prefix length
restrictions, IIRC, was 16 pages long.
>Gee, the recent wildcard mask puzzle was so much fun, let's do it again.
>
>The problem revolves around the OSPF network statement. Given an OSPF
>routing process, what are the fewest number of network statements that will
>incorporate the following networks into the given OSPF process?
>
>For example:
>
>router OSPF 100
>Network a.b.c.d w.x.y.z area 0.0.0.0
>Network b.c.d.e u.v.w.x area 0.0.0.0
>etc
>
>Assume that all networks are in the same area ( for simplicity sake )
>You may also assume ( for simplicity sake ) that the particular interface on
>which each particular network resides is the first host address on that
>network. For example, on network 10.10.3.0/24, the first host address ( and
>therefore the interface address ) is 10.10.3.1
>
>Networks are as follows:
>
>10.10.3.0 /24
>10.25.17.0 /16
>10.51.100.192 /26
>172.16.0.0 /16
>172.16.100.0 /24
>172.16.210.240 /28
>172.27.32.0 /19
>192.168.0.0 /24
>192.168.1.0 /30
>192.168.207.56 /29
>
>remember - accolades go to the one who can enter all of these networks into
>a single ospf process with the fewest possible network statements.
>
>Have fun!
>
>Chuck
>
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>
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>
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