IP subnet zero clarificatioin and exam related questions

satishtech

1.

255.255.255.128

without IP subnet zero

we get : Host range 128 to 254

with IP subnet zero enabled

we get : Host range 0 to 128 and 128 to 254


2.

255.255.255.192
with ip subnet zero enabled
Host range = 0 to 62 , 64 to 126 , 128 to 190 , 192 to 253

am i correct ?

Exam day questions :

1.Will I be given a paper or board to write on ?
2.Can I write the 2's exponential values on the board given
and multiples of 16 etc , what else should I write , if it is Allowed.
3.How much time per question ? Is the time enough ?

volfkhat

satishtech wrote: »

1.255.255.255.128

without IP subnet zero

we get : Host range 128 to 254

Almost.
The First Address is reserved as the Subnet Address.
The Last address is reserved as the Broadcast Address.
The Host Range is EVERYTHING in between --> 129 to 254.

satishtech wrote: »

2.255.255.255.192
with ip subnet zero enabled
Host range = 0 to 62 , 64 to 126 , 128 to 190 , 192 to 253

am i correct ?

Again, Almost.
0 is reserved for the Subnet Address.
63 is reserved for the Broadcast Address.
Thus, 1 - 62 is the HOST range.

64 is reserved for the Subnet Address.
127 is reserved for the Broadcast Address.
65 - 126 is the HOST range.

Now, you tell me the last two subnets :]


Yep, you get something to write on. You can Write whatever you want (from memory).
You can EVEN do it before you hit the START button :]

Priston

ip subnet-zero command provides the use of the first and last subnets.

1.255.255.255.128

without IP subnet zero
we don't get anything.

with IP subnet zero
we get host address range 1 - 126 and 129 - 254 (0 and 128 subnet ID and 127 and 255 broadcast addresses)


2.255.255.255.192

without IP subnet zero
we get host address range 65-126 , 129-190

with IP subnet zero
we get host address range 1-62 , 65-126 , 129-190 , 193-254

volfkhat

Oh Geez,
i didnt realize satistech was referring to a specific command :]

Sorry!!
Priston answered this better than I.

(my answer only addressed the proper Host ranges)

satishtech

Priston without IP subnet zero
255.255.255.128

should give hosts 129 to 254 , you said we get nothing

Thanks volfkhat
129 to 190 , 193 to 254

volfkhat

satishtech wrote: »

Thanks volfkhat
129 to 190 , 193 to 254

You got it, my friend :]