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Subnetting question


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#1 txn41655

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Posted 14 November 2016 - 01:55 PM

Hi I am new to Networking. I have a assignment that requires to connect and configure devices on a topology in cisco packet tracer but I am stuck on one instruction. hope someone could help?

it said "Use 10th class “C” private network to assign subnets for serial link with appropriate mask" . I am not sure if I understand correctly (Please correct me if I am wrong) ?? : 

Class A Class  = 0   to 126 subnet 255.0.0.0 

Private 10.0.0.0 /8 or 10.0.0.0 to 10.255.255.255
 
1st  Class A = 0.0.0.0 
2nd  Class A = 1.0.0.0 
3rd  Class A = 2.0.0.0
4th  Class A = 3.0.0.0
5th  Class A = 4.0.0.0
6th  Class A = 5.0.0.0
7th  Class A = 6.0.0.0
8th  Class A = 7.0.0.0
9th  Class A = 8.0.0.0
10th Class A = 9.0.0.0
 
 
Class B Class  = 128 to 191 subnet 255.255.0.0
Private 172.16.0.0 /12 or 172.16.0.0 to 172.31.255.255
 
1st  Class B = 128.0.0.0 
2nd  Class B = 128.1.0.0 
3rd  Class B = 128.2.0.0
4th  Class B = 128.3.0.0
5th  Class B = 128.4.0.0
6th  Class B = 128.5.0.0
7th  Class B = 128.6.0.0
8th  Class B = 128.7.0.0
9th  Class B = 128.8.0.0
10th Class B = 128.9.0.0
 
 
Class C Class  = 192 to 223 subnet 255.255.255.0
Private 192.168.0.0 /16 or 192.168.0.0 to 192.168.255.255
 
1st  Class C = 192.0.0.0 
2nd  Class C = 192.0.1.0 
3rd  Class C = 192.0.2.0
4th  Class C = 192.0.3.0
5th  Class C = 192.0.4.0
6th  Class C = 192.0.5.0
7th  Class C = 192.0.6.0
8th  Class C = 192.0.7.0
9th  Class C = 192.0.8.0
10th Class C = 192.0.9.0
 
 
1st  Class C private network 192.168.0.0
2nd  Class C private network 192.168.1.0
3rd  Class C private network 192.168.2.0
4th  Class C private network 192.168.3.0
5th  Class C private network 192.168.4.0
6th  Class C private network 192.168.5.0
7th  Class C private network 192.168.6.0
8th  Class C private network 192.168.7.0
9th  Class C private network 192.168.8.0
10th Class C private network 192.168.9.0 ?


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#2 Wand3r3r

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Posted 14 November 2016 - 02:15 PM

There are no 1, 2, 3rd class ip addresses.  There is only A, B, C and reserved.

 

Perhaps you are mixing the number of subnets with the class of subnet.

 

I suspect the this question followed one where you had to subnet the class c you are working with into 16 subnets or more.

 

So the 10th subnet, if using 255.255.255.240 and 192.168.0.0 would have the subnets as follows;

 

1st= 0-15 [as in 192.168.0.0-192.168.0.15]

2nd =16-31

3rd= 32-47....... I will let you figure it out what the 10th subnet would be.

 

But it is always good to consult with your instructor or other folks in the class for clarification.  Language can be a funny thing


Edited by Wand3r3r, 14 November 2016 - 02:23 PM.


#3 txn41655

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Posted 14 November 2016 - 02:27 PM

thanks for your reply, in this assignment is does not specify to subnet . This is to configure 1 of routers in a topology in packet tracer. here are 2 instructions : 

 

Use 10th class “C” private network to assign subnets for serial link with appropriate mask

 

Use the 5th class “B” private network to assign subnets to the LAN links. The maximum number of users will be 25 on all links. Use appropriate mask.



#4 Wand3r3r

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Posted 14 November 2016 - 03:20 PM

Been out of school for a long time :-)

 

Lets start with the max users.  You have a choice of 30 hosts and 14 hosts depending on subnet.  What is your guess?

 

If we eliminate the word "class" we have

"Use [the]10th  , class “C” private network , to assign subnets for serial link with appropriate mask" [note the commas]

 

I read this as the 10th subnet out of 14 if you use the 255.255.255.240 subnet mask [though a little strange since these are serial ports and "users" aren't counted]

 

You would apply the same logic to the class b question.  What subnet would you use?



#5 txn41655

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Posted 15 November 2016 - 01:15 AM

my instructor said  "Use 10th class “C” private network to assign subnets for serial link with appropriate mask" means the 10th network in the private ip address in class C, which is 192.168.9.0  and "Use the 5th class “B” private network" the 5th network in the rprivate ip address in class C which is 128.4.0.0.  . I have 4 serial link and 2 LAN links on my router.



#6 Wand3r3r

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Posted 15 November 2016 - 01:10 PM

I see a lot of this mis-definition of terms these days on the internet.  People call routers modems though there is a huge difference in the terms.

 

192.168.0.0 /24 is one subnet.  192.168.9.0/24 is another.  These are not "classes", they are subnets [if using class c subnet mask] as in without a router they can't speak to each other.  There is also the usage of "classes" to indicate which octet makes the difference.  In a class C its the 3rd octet.  In class B its the 2nd octet.

 

Though you need to learn the instructor/test answers/terms if you want the grades/certs.

 

Just keep in mind what you learn in school is just the beginning of your education in the real world of networking.


Edited by Wand3r3r, 15 November 2016 - 01:14 PM.


#7 Trikein

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Posted 15 November 2016 - 01:38 PM

 People call routers modems though there is a huge difference in the terms.

 

 

Hopefully those people aren't teaching networking classes. My A+ instructor insisted Bluetooth was a LOS technology because of a typo in one of the text books. Those that can't....teach.


Edited by Trikein, 15 November 2016 - 01:42 PM.





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