At 11:11 AM 11/14/00 -0800, Priscilla Oppenheimer wrote:
>Answer A "more reachable errors" is clearly wrong since it's nonsense. I
>think answer D is wrong also because an OSPF router doesn't really have a
>link-state database. It has a topology database. (I'm not an OSPF guru,
>but when trying to pass a test I look for cases where the test-writer
>garbled the terminology to make a wrong answer.)
Hmm, Priscilla, I have to disagree with you here--RFC 2328 refers not to a
"topology database," but to a "link-state database."
I find many of the terms commonly used to describe OSPF are not precise,
and it's important for those new to internetworking to be aware of
this. "Topology database" and "link-state database" seem to be used
interchangeably by some very knowledgeable folks, and I don't really think
one is more correct than the other--after all, they both refer to a data
structure that describes the topology of the OSPF internetwork for that
area. The Cisco course materials tend to call it a "topology database,"
but I wouldn't be the one to suggest that makes the RFC incorrect.
Here's another example: RFC 2328 refers to a "neighbor data structure,"
but it is almost always called an "adjacencies database," "neigbor table,"
or in more recent Cisco course materials, "neighborship database" when
people write about it. All those terms mean the same thing--a place in the
router's memory where it stores information about its neighbors.
Radia Perlman has a nice rant on the topic of imprecise terminology in the
2nd edition of "Interconnections." Highly recommended, for those who
haven't already seen it. ;-)
Pamela
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