1. (18 Points) Fill in the following table. Make sure before you start, you understand
the difference between “maximum” and “useable” when considering number of
subnets or number of hosts in a subnet.
Classful IP
Network Address
Subnet bits
borrowed
204.7.7.0
5
160.45.0.0
10
126.0.0.0
20
223.223.233.0
4
133.50.0.0
8
95.0.0.0
12
Subnet mask
(in decimal)
Maximum
# subnets
Useable #
hosts/subnet
2. (16 Points) Given the Classful IP Network Address of 218.200.100.0 and 3-bits for
subnetting, fill in the table below.
*Do not include first and last host address in each subnet to get the useable host address
range.
Subnetwork Subnet Field
*Useable Range of Host Addresses in Decimal Quad
Notation
Number
(in binary)
Low
High
0
000
1
001
2
010
3
011
4
100
5
101
6
110
7
111
3. (2 Points) Given the IP address from question two and the number of bits borrowed
for subnetting what is the subnet mask in decimal quad notation?
__________________
4. (16 Points) A small computer parts manufacturing company has to expand its
network infrastructure while still using their classful class C network address,
195.202.88.0. Their security minded Operations Manager has decided to place each
key corporate division on its own subnet. The table below shows the details.
Department
Management
Marketing
Accounting
R&D
Embedded Systems
IS
Computers
8
26
11
14
10
22
Unicast Assignable Devices
Printers No.
Other Devices
8
0
5
3
Scanners
8
0
5
7
Bio-sensors
4
4
Logic Analyzers
8
0
Imagine you are the Operations Manager. Develop a subnetting plan based on the
information given in the table above. Note that the term ‘useable subnets’ refers to the
total number possible minus the first and the last subnet since some routers cannot use
the first and last subnet. Answer the following set of questions:
a. How many bits did you borrow for subnetting?
_______________________
b. How many useable subnets are possible given the number of bits used?
_______________________
c. How many useable subnet addressable components can be supported per subnet?
_______________________
d. Have all department requirements been met? _________(Yes/No)
e. Have all addressable components required in a network been defined in the table
above? __________ (Yes/No) If ‘No’ what are they and how many are required?
f. If “No”, describe which ones have not been met and why.
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
____________________
If “Yes”, give the address ranges in the space below needed for the subnetwork
addressable components in each department.
Division
Management
Marketing
Accounting
R&D
Start IP
End IP
Subnet ID
Embedded Systems
IS
5. IP subnetting and assignment (39 points)
Part I (24 points) - Using the following diagram divide the network into three subnets, A, B, and C.
You will be using a classful private IP address of 192.168.0.0. Given the number of devices in the
diagram formulate an addressing scheme and assign IP addresses to each device on the network,
including the 3 router interfaces. Follow conventional IP assignment, i.e. router interfaces will be
assigned the high end numbers and servers assigned addresses in the low range.
S = Switch
H = Hub
A
C
B
Part II (15 points) –
Subnet A
This subnet address
Complete the tables.
Low Host address
High Host address
Default Gateway address
Subnet broadcast address
Subnet B
This subnet address
Low Host address
High Host address
Default Gateway address
Subnet broadcast address
Subnet C
This subnet address
Low Host address
High Host address
Default Gateway address
Subnet broadcast address
6. (9 points) ARP and Ping Analysis - Using the diagram on the next page answer the
following questions. You must briefly explain your response you will not receive
credit for a “Yes” or “No” answer.
a.
If A’s ARP table is empty and A pings C will D and E see the ARP Request? Why or why Not?
b.
If C pings A successfully, will B see the ICMP Request and the ICMP reply? Why or why not?
c.
Workstation Cs ARP table is empty and C wants to send an ICMP request to workstation D. What
does station C ARP for? What does the router do if it does not know workstation D’s MAC address?
Does it need to know it?
Bonus (10 points)
How many collision and broadcast domains exist in this topology and what devices belong to
each?