covering skills integrated challenged

6.8.1

planning subnets and configuring ip addresses

In this lab we've been asked to implement the standard lab topology but

with the new ip addressing scheme

you'll be using many of the skills you have learned including the VLSM

ip configuration

and troubleshooting

to help with the vlsm part

i devised a spreadsheet

when it comes to address allocation

an address calculation

to begin this lab I am going to open up the Packet Tracer activity window

to see

what they're asking us to accomplish

they specified under task one so we are given an address block a one ninety two

dot one sixty eight

dot twenty-three

dot zero slash twenty four

and we must provide for the existing networks as well as featured networks so

what i have done is they've taken this area right here

and i have mapped it out over to my spreadsheet

so subnet zero are for sublet will represent the existing student land

which contain sixty usable host

i added to to this number

address the network address as well as the broadcast address

there's also going to be some room for future growth when it comes to the

student land

some making that my subnet one

and according to the

packet tracer activity

this future student land is supposed to go up to

a total of thirty host

the next subnet, subnet two

is going to contain or represent the existing ISP's LAN

which has a server and the ISP's router

and that he will have a total of fourteen host

the forth subnet, subnet three

will be the future ISP's LAN and that'll container totaled eight host

and lastly subnet four

which will represent the existing WAN

of a total of four host addresses

miami scroll further down the list of things today on

and this next section

we are told how we are to configure our interfaces for each of these devices

once again to make a simple for us

i devised a spreadsheet

to break down

two-three local area networks

into more mandible tables

so the first local area network i'm calling the existing student land

which will have three devices pc one day

pc one b

as well as or two

the next local area network

is called the existing i a speedy and that has two devices the server

what will act as a d_n_a_ server as well as an age tdpc ever

and then the eyes peas router are one

the other lam

technically is a win who joins those two previous lambs together

and not only has two devices on it

are one

and arturo

and on those routers

we have the serial interfaces they're connected together to establish the swim

cell

i got this information from the activity window i'll like using the spreadsheet

kazi disney ability to manage

and calculate the address is required to configure these devices

to begin this activity and we need to calculate

the new subnet addresses

for these existing liens as well as future lance

so let me get rid of the p_t_a_ activity would know

let's put our focus into our spreadsheet

remember that we are given an i_p_o_ address block of one ninety two

dot one sixty eight

dot twenty-three

dot zero

slash twenty four

the requirements for repeat

area network can be found in this table

and someone over to my next

worksheet called address calculation

and here you can see that my address block

was specified unreal three

and in the fourth octet

that's my host octet nine oh this is my host octet

because this is a slash twenty four

address block so stymie the very first twenty four bits

that is

the first psychic and third octet

are the network portion

that i'm not allowed to touch

since i'm allowed to touch the fourth octet because that represents the hope

host portion

i have broken and out into the eight columns that represent each bit

of this octet

remember subnet zero

was the existing student

land

and they need is a total of sixty two host addresses

system given host addresses

i might come into this role really

anna click on the very bottom box on the far right corner

the reason why i'm picking this boxes because this represents my subnet mask

and because i'm dealing with sixty to host addresses i have to ask myself one

question

how many best must i'd leave behind

to accommodate

sixty to host

so let's say if i leave this first bit behind

what would the size of my subnet d

according to my spreadsheet

the size of the subnet

is going to be

too

total host addresses

if i were just to leave the last bit behind

to host addresses are not enough to accommodate

the first subnet

so what happens if i believe the last two bits along

well that gives me for

so to raise to two bits gives me four host addresses

still not enough

let me try for the next one

well now on leaving three dates behind

not touching them

to raise the three gives the eight still not enough

let me leave for pits behind

to raise the forgets b_-sixteen still not enough

then really five deaths of

to raise the five disney thirty-two i'm getting closer

but still not enough

so let's see what happens if at least six states behind

so when i leave six pits behind to raise this excuse me sixty four

and that's just about right

so what do i do with these other two

that's when it comes to my subnet

the only way computer knows where the network portion anne's and where the

host pushing against

is by using zeros and ones

any zero underneath and i_p_ bit

represents the host portion

any i_p_ debt that has a one underneath it represents that the network portion

somewhat apo one here

and the one here

when i do this my spiritual automatically color

sells above it

to a bright red color

this caller indicates that these are

debts are going to be used to represent myself netmask

now my goal

is the cackling with network address is going to be

and what the broadcast address could it be

with these two pieces of information

i know what my usable ranges my first feasible addresses can be the first

address after the network address

and my last sees a black dresses go into the address right before the broadcast

since this is my first subnet

i'm going to assign it

the very first address of his address book

which would be zeros

a network address contains all zeros in host portion as well

so let me put some zeros in here

and i've dealt with

spreadsheet to automatically take these binary members and comforting back in a

decimal

food network address of sub-zero is going to be one ninety two

one sixty eight

dot twenty-three

dot zero

it's going to have a subnet mask of two fifty five

dot g_-fifty five

dot t_-fifty five

dot one ninety two

let me pick or disinformation

onto my address allocation worksheet

angle to row four under the network address block my type of one ninety two

topped one sixty eight

dot twenty-three dot zero remember this is where address block originally began

cannot fill out the broadcast address just yet

but i can fill out the so that mask for the existing student land

by coming down here

to wrote twelve

under column f

let me change the so it's two fifty five dot g_-fifty five dot g_-fifty five dot

one ninety two

under the using that information later when i come figure my interfaces

alright cannot fill anything else now

the sea

device one ace facets of a is going to the first usable address

the first usable address is the address right after the network actress

if my network addresses one nineteen doubt one sixty dot twenty-three dot t_

rowe

my first usable do one ninety two

dot one sixty

dot twenty three

connects usable

would be one ninety two dot one sixty eight dot twenty-three dot chip

what about the last usable

in order for me to know what the less usable addresses i'm attacked with the

broadcast address so let me go back to my address calculation

worksheet

and the definition of broadcast address because when you have all wants and the

host portion

these dates right here

represent the host portion

because these are the dates that have zeros underneath it for the subnet mask

so let me change them so they're all warrants

savell one here

po one here

and the one there

and a few other ones right here

when i had an er

my decimal

has changed from a zero

to a sixty three

the important thing here is the red bits did not change

those red bizarre once used to identify

the difference sublets

as long as the network address in the broadcast address contained at both

the same

to read debts they belong to the same logical address

because they belong to the same logical address they did communicate well with

each other so let me go back to the address allocation table

and now i can fill out the broadcast address cell

furrow four

one ninety two dell point sixty eight dot twenty three

dot sixty three

and now they know the broadcast address i'm noah my last usable addresses

country

that's going to be a sixty two

or dot sixty two

found using shorthand because in this column

i put one ninety two dot one sixty eight dot twenty three above it

indicating that that

pre lubes

the values that i typed out here

however you create your spreadsheet or whatever you do to calculate your work

to get your i_p_ addresses

is entirely up to you

to each of their own

now the accomplished existing student manager

i must accomplished a future student

which is the next largest subnet

remember he always start with the largest network can you work your way

down

if you look at this list it was all organized for you

from the largest

down to the smallest always remembered add to ticket total hollis actresses

the cell so if this column is the values you will use

they calculate your network addresses as well as yourself netmask

so let's look at some

subnet one the future student name

the total house address is a need for the sublet is thirty

if i do this and order

if this network addresses one ninety two dot one sixty eight dot twenty three dot

zero

and that's the first address