IP subnet zero clarificatioin and exam related questions

satishtechsatishtech Member Posts: 243
in CCNA & CCENT
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 ?
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Comments

  • volfkhatvolfkhat Member Posts: 1,046 ■■■■■■■■□□
    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 :]
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  • PristonPriston Member Posts: 999 ■■■■□□□□□□
    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
    A.A.S. in Networking Technologies
    A+, Network+, CCNA
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  • volfkhatvolfkhat Member Posts: 1,046 ■■■■■■■■□□
    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)
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  • satishtechsatishtech Member Posts: 243
    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
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  • volfkhatvolfkhat Member Posts: 1,046 ■■■■■■■■□□
    satishtech wrote: »

    Thanks volfkhat
    129 to 190 , 193 to 254

    You got it, my friend :]
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