Almost at the end of my CCNA preparation (using 2 books, Sybex & cisco press); when I am totally flabbergasted on the frame-relay chapter in the books!
Todd's book says DLCIs are locally significant & config must include local DLCI. e.g. # frame-relay interface-dlci 101.
Cisco press says DLCIs are globally significant & config must include remote net DLCI. e.g. # frame-relay interface-dlci 550.
What is going on?
Then, you can configure frame-relay:-
1] Without using sub-interfaces (e.g. 3 routers using 1 subnet without using p-to-p or p-to-mp).
2] Using point-to-point sub-int.
3] using point-to-multipoint.
4] Hybrid - mix of p-to-p & p-to-mp.
The content (only FR) in both the books 'just' presents the information 'about' frame-relay. They do not tell you as a customer or test-taker that given a scenario, how 'should' you do it & why; given so many options?
For the exam, what is the criteria by which I decide what config to use. And from the exam point of view, is there a 'right cisco way' to do it?
Also, could anyone please mention any links on good explanations with configs on FR. I really would appreciate that.