Options
Frame Relay Question
fieldmonkey
Users Awaiting Email Confirmation Posts: 254 ■■■□□□□□□□
in CCNA & CCENT
I was perplexed by the answer the book gave for this question, and don't understand why at this point...
ICND2-DIKTA (page 459)
6. FredsCo has five sites, with routers connected to the same Frame Relay network. Virtual Circuits (VC) have been defined between each pair of routers. What is the fewest subnets that FredsCo could use on the Frame Relay network?
a. 1
b. 2
c. 3
d. 4
e. 5
f. 10
I felt the answer was either (5) or (4), because the book suggest one subnet per VC. The answer turns out to be (10), and I don't understand why?
Below is what I am picturing in my head, as the setup for the question, not sure if I have it setup right in PT, never configured Frame Relay til now...
Time for some more goose-n-juice. Maybe that will help me understand!
ICND2-DIKTA (page 459)
6. FredsCo has five sites, with routers connected to the same Frame Relay network. Virtual Circuits (VC) have been defined between each pair of routers. What is the fewest subnets that FredsCo could use on the Frame Relay network?
a. 1
b. 2
c. 3
d. 4
e. 5
f. 10
I felt the answer was either (5) or (4), because the book suggest one subnet per VC. The answer turns out to be (10), and I don't understand why?
Below is what I am picturing in my head, as the setup for the question, not sure if I have it setup right in PT, never configured Frame Relay til now...
Time for some more goose-n-juice. Maybe that will help me understand!
WIP:
Husband & Fatherhood Caitlin Grace born 8-26-2010
Future Certs:
Q1-2011 - INCD2, Microsoft or Linux (decisions, decisions...)
Husband & Fatherhood Caitlin Grace born 8-26-2010
Future Certs:
Q1-2011 - INCD2, Microsoft or Linux (decisions, decisions...)
Comments
-
Optionsmikem2te Member Posts: 407fieldmonkey wrote: »FredsCo has five sites, with routers connected to the same Frame Relay network. Virtual Circuits (VC) have been defined between each pair of routers.
The diagram you made in PT is the physical toplogy, this question is asking about the logical topology. Ignore the physical connections to the frame relay switch, the number of virtual circuits is the key here.
The statement above states there is a virtual circuit between each pair of routers implying a full mesh of virtual circuits, every router has a virtual circuit to all other routers, so there are the following VCs
Between Router 0 & Router 1
Between Router 0 & Router 2
Between Router 0 & Router 3
Between Router 0 & Router 4
Between Router 1 & Router 2
Between Router 1 & Router 3
Between Router 1 & Router 4
Between Router 2 & Router 3
Between Router 2 & Router 4
Between Router 3 & Router 4
So 10 virtual circuits == 10 subnets
Make sense?Blog : http://www.caerffili.co.uk/
Previous : Passed Configuring Microsoft Office SharePoint Server 2007 (70-630)
Currently : EIGRP & OSPF
Next : CCNP Route -
Optionsjohnwest43 Member Posts: 294If thats the case then its a full mesh right? and if its a full mesh then we need only 1 subnet. Am I way off?CCNP: ROUTE B][COLOR=#ff0000]x[/COLOR][/B , SWITCH B][COLOR=#ff0000]x[/COLOR][/B, TSHOOT [X ] Completed on 2/18/2014
-
Optionsnotgoing2fail Member Posts: 1,138johnwest43 wrote: »If thats the case then its a full mesh right? and if its a full mesh then we need only 1 subnet. Am I way off?
That's correct. The answer is choice A.
With a full mesh, you can use just one subnet. -
Optionsfieldmonkey Users Awaiting Email Confirmation Posts: 254 ■■■□□□□□□□That was the other confusing part because it doesnt state whether it was a full or partial mesh, so naturally I assumed it was NOT a full mesh configuration. Therefore A would have been my selection, but since it doesn't state that I began trying to determine what configuration they might use and ruled out a full mesh.
In the end if you have 10 VCs, it makes more sense to use 1 subnet, or am I wrong?
Bad question IMHOWIP:
Husband & Fatherhood Caitlin Grace born 8-26-2010
Future Certs:
Q1-2011 - INCD2, Microsoft or Linux (decisions, decisions...) -
Optionsfieldmonkey Users Awaiting Email Confirmation Posts: 254 ■■■□□□□□□□Thanks for clarifying, it makes sense now. The question could be worded betterWIP:
Husband & Fatherhood Caitlin Grace born 8-26-2010
Future Certs:
Q1-2011 - INCD2, Microsoft or Linux (decisions, decisions...) -
Optionsnotgoing2fail Member Posts: 1,138fieldmonkey wrote: »Thanks for clarifying, it makes sense now. The question could be worded better
He didn't want to tell you it was a full mesh because then the answer would have been too easy. So he tried to word it in a way for you to think of the connection points logically as Mike referred to in his post above... -
Optionsfieldmonkey Users Awaiting Email Confirmation Posts: 254 ■■■□□□□□□□The answer would have been totally different if he supplied the info that you are using a full mesh.WIP:
Husband & Fatherhood Caitlin Grace born 8-26-2010
Future Certs:
Q1-2011 - INCD2, Microsoft or Linux (decisions, decisions...) -
Optionsmikej412 Member Posts: 10,086 ■■■■■■■■■■The question in my book is for BobCo and a full mesh configuration -- and President Bob fires anyone who doesn't use one subnet per VC. That rules out the one subnet option and leaves the 10 subnet option as the answer.:mike: Cisco Certifications -- Collect the Entire Set!
-
Optionsmikem2te Member Posts: 407notgoing2fail wrote: »He didn't want to tell you it was a full mesh because then the answer would have been too easy. So he tried to word it in a way for you to think of the connection points logically as Mike referred to in his post above...
The original question did say fewest so that rules out 10, looks like the author got his own wrong!!Blog : http://www.caerffili.co.uk/
Previous : Passed Configuring Microsoft Office SharePoint Server 2007 (70-630)
Currently : EIGRP & OSPF
Next : CCNP Route -
Optionsfieldmonkey Users Awaiting Email Confirmation Posts: 254 ■■■□□□□□□□Ahhh! Must have had too much goose n juice...lmao....
I was looking at the ANSWER for question #7, for Question 6... The correct answer was A, as we have discussed.
My problem was with question 7, but you all have helped me understand even more now...it was right there all along!!! "Point to point subinterfaces"WIP:
Husband & Fatherhood Caitlin Grace born 8-26-2010
Future Certs:
Q1-2011 - INCD2, Microsoft or Linux (decisions, decisions...)