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New Member

VLSM Question

Hi,

I have a VLSM question as follow:

The base address given is 10.1.0.0/23:

Required:

1) 6 hosts and 7 subnets

2) 2 hosts and 6 subnets

Can anyone help me out on this?

Thanks

  • LAN Switching and Routing
6 REPLIES
New Member

VLSM Question

Edit on the requirements:

Require:

1) 6 hosts in each 7 subnets

2) 2 hosts in each 6 subnets

Thanks

VIP Super Bronze

VLSM Question

for 6 hosts in each subnet you can use multiple /29

example:

10.1.0.0/29 useable host 1-6

10.1.0.8/29 useable hosts 9-14

10.1.0.16/29 useable hosts 17-22

10.1.0.24/29 useable hosts 25-30

10.1.0.32/29 useable hosts 33-38

10.1.0.40/29 useable hosts 41-46

10.1.0.48/29 useable hosts 49-54

for 2 hosts you can use /30s

10.1.0.56/30

10.1.0.60/30

10.1.0.64/30

10.1.0.68/30

10.1.0.72/30

10.1.0.76/30

HTH

New Member

VLSM Question

Thanks Reza for the quick reply. Just to double check that the second VLSM subnet is correct?

As from /29 (first subnet) to /30 (second subnet) there is only 1 bit change (below table the 30th bit) thus the valid range for second subnet can only be: 10.1.0.56/30 and 10.1.0.60/30.

10

1

0

56

0000 1010

0000 0001

0000 0000

0011 1000

10.1.0.56/30

10

1

0

60

0000 1010

0000 0001

0000 0000

0011 1100

10.1.0.60/30

Plaese advice.

Thanks

Hall of Fame Super Blue

VLSM Question

Not sure what you mean when you say -

thus the valid range for second subnet can only be: 10.1.0.56/30 and 10.1.0.60/30.

Alain's answer is correct, all the /30 subnets he has posted can be used.

Jon

Purple

VLSM Question

Hi Jon,

Thanks for referencing me even if I did nothing on this post 

Regards

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.
Hall of Fame Super Blue

VLSM Question

 

I'm getting old.

Apologies Reza, my mistake.

Jon

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