Case Studies (Networking Labs)

Case Study 1:(IPv4 subnet addressing scheme)

1) Figure out how many subnets to create.
2) How many LAN's and WAN's
3) Develop an IP addressing scheme.
4) Assign an IP address on each machine.
Note: Subnet Address is assigned to each interface like E0, E1, S0, S1, T0, T1, et al... Subnet mask and a valid range of Host Address.




Answers Case Study 1:

1) 8 subnets needed

2) LAN=5 WAN=3

3) IP Addressing scheme

LAB-A
Given E0:
192.5.5.1 --> Class C

Required:
--> since 2 bits must be left in borrowing bits from host portion of the IPv4 address (Network and Broadcast Address)
just borrow 6 bits max
2^4 = 16-2 = 14 subnets

Solution:
192.5.5.1/24
AND
255.255.255.0/24 -->Default Subnet Mask
--------------
192.5.5.0/24 -->Network Address(Subnet 0)

192.5.5.11110000/28
192.5.5.240/28 (last subnet address)

255.255.255.240/28 --> Custom Subnet Mask

2^4=16-2=14 hosts/subnet

Subnet Address <---> Broadcast Address <---> Host Range Address
0) 192.5.5.0/28 <--->192.5.5.15/28 <-----> 192.5.5.1/28~192.5.5.14/28
1) 192.5.5.16 /28 <-> 192.5.5.31 /28 <----> 192.5.5.17/28~192.5.5.30/28
2) 192.5.5.32/28 <-> 192.5.5.47/28 <----> 192.5.5.33/28~192.5.5.46/28
3) 192.5.5.48/28 <-> 192.5.5.63/28 <----> 192.5.5.49/28~192.5.5.62/28
*
*
*
14) 192.5.5.240/28 <----> 192.5.5.255/28 <--> 192.5.5.241/28~192.5.5.254/28

Given E1:
205.7.5.1/24 --> Class C

Solution:
2^4 = 16-2 = 14 subnets

205.7.5.1/24
AND
255.255.255.0/24 --> D.S.M.
---------------
205.7.5.0/24 -->N.A

205.7.5.11110000/28=205.7.5.240/28(last subnet)
255.255.255.240/28 --> C.S.M.

Subnet Address <---> Broadcast Address <---> Host Range Address
0) 205.7.5.0/28 <--> 205.7.5.15 <------> 205.7.5.1~205.7.5.14
1) 205.7.5.16/28 <-> 205.7.5.31/28 <-----> 205.7.5.17/28~205.7.5.30/28
2) 205.7.5.32/28 <-> 205.7.5.47/28 <----> 205.7.5.33/28~205.7.5.46/28
*
*
*
14)205.7.5.240/28 <----> 250.7.5.255 /28<----> 205.7.5.241/28~250.7.5.254/28


Given S0:
201.100.11.1

Solution:

201.100.11.1
AND
255.255.255.0/24 --> Default Subnet mask
---------------
201.100.11.0/24 -->Subnet 0 (Network Address)

2^4 = 16-2 = 14 subnets

201.100.11.11110000/28= 201.100.11.240/28(last subnet)
255.255.255.240/28 --> Custom Subnet Mask

Subnet Address <---> Broadcast Address <---> Host Range Address
0) 201.100.11.0/28 <-> 201.100.11.15 <--> 201.100.11.1~201.100.11.14
1) 201.100.11.16/28 <-> 201.100.11.31/28 <--> 201.100.11.17/28~201.100.11.30/28
2) 201.100.11.32/28 <-> 201.100.11.47/28 <--> 201.100.11.33/28~201.100.11.46/28
*
*
62) 201.100.11.240/28 <--> 201.100.11.255/30 <--> 201.100.11.241/30~201.100.11.254/30

4) ROUTER(2514) LAB CONFIGURATION

Step Description/Explanation	Router Command Prompt	IOS Command
Enable privileged mode	Router>	enable
Configure(the router) from Terminal(keyboard)	Router#	config t
Name Router LAB-A (the prompt will change)	Router(config)#	Hostname LAB-A
Set privileged mode encrypted (secret) password to class	LAB-A(config)#	Enable secret class
Set privileged mode text password (optional)	LAB-A(config)#	Enable password cisco
Disable DNS lookup	LAB-A(config)#	No ip domain-lookup
Select E0 interface	LAB-A(config)#	Interface Ethernet0
Provide description for E0 (optional on any interface)	LAB-A(config-if)#	Description connected to LAN A
Set E0 IP address and subnet mask	LAB-A(config-if)#	ip address 192.5.5.1 255.255.255.0 ¿
Bring interface E0 up	LAB-A(config-if)#	No shutdown
Save interface configuration	LAB-A(config-if)#	Cntrl Z
Select E1 interface	LAB-A(config-if)#	Interface Ethernet1
Set E1 IP address and subnet mask	LAB-A(config-if)#	ip address 205.7.5.0 255.255.255.0 ¿
Bring interface E1 up	LAB-A(config-if)#	No shutdown
Save interface configuration	LAB-A(config-if)#	Cntrl Z
Select S0 interface	LAB-A(config-if)#	Interface Serial0
Set S0 IP address and subnet mask	LAB-A(config-if)#	ip address 201.100.11.1 255.255.255.0 ¿
Set IGRP bandwidth metric	LAB-A(config-if)#	Bandwidth 56
Set DCE clock synch at 56000	LAB-A(config-if)#	Clock rate 56000
Bring interface S0 up	LAB-A(config-if)#	No shutdown
Save interface configuration	LAB-A(config-if)#	Cntrl Z
Select S1 interface(not used)	LAB-A(config-if)#	Interface Serial1
Set no IP address for S1	LAB-A(config-if)#	No ip address
Administratively shutdown S1	LAB-A(config-if)#	Shutdown
Exit interface config mode	LAB-A(config-if)#	Exit
Start RIP routing protocol	LAB-A(config)#	Router rip
Specify directly connected network for routing updates	LAB-A(config-router)#	Network 192.5.5.0
Specify directly connected network for routing updates	LAB-A(config-router)#	Network 205.7.5.0
Specify directly connected network for routing updates	LAB-A(config-router)#	Network 201.100.11.0
Exit router config mode	LAB-A(config-router)#	Exit
Define router host name table
Specify host table entry for Lab-A(with interface IP address)	LAB-A(config)#	Ip host LAB-A 192.5.5.1 205.7.5.1 201.100.11.1
Specify host table entry for Lab-A(with interface IP address)	LAB-A(config)#	Ip host LAB-B 219.17.100.1 199.6.13.1 201.100.11.2
Specify host table entry for Lab-A(with interface IP address)	LAB-A(config)#	Ip host LAB-C 223.8.151.1 204.204.7.1 199.6.13.2
Specify host table entry for Lab-A(with interface IP address)	LAB-A(config)#	Ip host LAB-D 210.93.105.1 204.204.7.2
Specify host table entry for Lab-A(with interface IP address)	LAB-A(config)#	Ip host LAB-E 210.93.105.2
Disable classless IP routing	LAB-A(config)#	No ip classless
Configure console line(direct attached to console port)	LAB-A(config)#	Line con 0
Enable console login password checking	LAB-A(config-line)#	Login
Set user mode password for console connection login	LAB-A(config-line)#	Password cisco
Configure telnet line(virtual terminal or VTY)	LAB-A(config-line)#	Line vty 0 4
Enable telnet login password	LAB-A(config-line)#	Login
Set user mode password for telnet connection login	LAB-A(config-line)#	Password cisco
Save line configuration	LAB-A(config-line)#	Cntrl Z
Save the current running configuration to the startup configuration	LAB-A#	Copy running-config startup-config

Case Study 2: