Answer / jitendera kumar sinha

hello friends i have a request if you are going to mark any
answer no then plz place yours answer but if you have any
confusion on that answer put your confusion here we are here
for share our knowledge not for putting each other to finger out
as any one mark my answer wrong then he should pleased his
remark that on what point of view he is marking my answer
wrong as i do that before marking any answer no if it look
like wrong according to me then i put my explanations. and
it will increase your knowledge as well as me.if you are not
agree with that put mark no without explanation. if yes then
mark yes without explanation(u can provide on your wish)

Answer / jitendera sinha

There are some rules of thumb for Cisco router OSPF designs:

A router should be in at most 3 areas (and watch your CPU
and RAM).
An area should contain 50 to 100 routers (I've also seen 25
in some Cisco documents).
A router should have fewer than 60 neighbors.

so shain your expalnation is wrong this is an interview
question and its comes from expernce

Answer / jitendera sinha

on the behalf of question asked by shain on my answer

if your network has fewer than 50 to 100 routers, you may
be able to just have one big (happy?) area 0.

When you try a real OSPF design, you'll find that OSPF area
0 tends to grow on you. I've been calling this the "vacuum"
effect: OSPF area 0 almost seems to pull links into it,
until you find your design is all one big area 0, and you
have to start over. My advice is to keep OSPF area 0 small.
If area 0 is small, it's easy to keep it robust. I prefer
to put the links connecting to non-backbone areas into
those areas, and keep them out of area 0

jitendera kumar sinha
network and security admnistrator

Answer / shahin

"A router should be in at most 3 areas"...... Cud u explain
this statement..!!!!

Answer / harish kumar

OSPF is a link-state routing protocol. Which is required a hierarchical network structure and the structure divided into area like backbone area, regular area, and stub area. Every area must be connected to area 0 or backbone area. Each router can communicate with in an area and area id should be same for an area routers. If an router want to communicate with the other area router it must be connected through ABR router.

Answer / shahin

Well.. This is not a CCNA based question. It an nterview
question asked to me, though i went there on CCNA based. I m
trying to explain here...

There are few rules of router applicable only in OSPF. these
are -

a. An internal router (IR) has all the interfaces within an
area.

b. A backbone router (BR) has at least one interface
assigned to area zero (Area o).

c. An area border router (ABR) has interfaces connected to
two or more areas.

d. An autonomous system boundary router (ASBR) has interface
in inside & outside the OSPF routing domain.

Can you define in short what VPN is?

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