Chapter 6 : Lab 6.2.2 Determining the Number of IP Networks

Task 1: Review Address Block Size

Review and record the total number of hosts to be addressed.

Complete this table with the information determined in Lab 6.2.1.

Network/VLAN Name #Number of host addresses
Default 14
Voice 254
Management 14
Administrative 62
Support 126
Production 126
Mobile 62
Peripherals 62
Net_admin 14
Web_access 14
Future 126
Null 126
Total 1000

What is the smallest address block size that can potentially satisfy the FilmCompany network needs?


Task 2: Choose or Obtain an Address Block

Step 1: Choose public or private addresses?

A block of addresses needs to be acquired to support the addressing scheme. This block of addresses could be private space addresses or public addresses. In most cases, the network users require only outbound connections to the Internet. Only a few hosts, such as web servers, require public addresses. These often exist on the local LAN with private addresses and have static NAT entries on the border router to translate to public addresses. Public address, however, are expensive and often difficult to justify. Can you make a justification of the use public addresses in this network?


If so, write this justification to forward to the ISP:

Step 2: Ensure that the private space addresses do not conflict

Although you are allowed to use private space addresses any way you choose, you must make sure that the addresses used do not conflict with another private space address to which this network will be connected. You must identify other networks to which you are connected and make sure that you are not using the same private addresses. In this case, you need to examine the addresses used by the StadiumCompany.

What address private space block does the StadiumCompany use? /16

What address blocks are used by the WAN links? /30

Are there other devices or connections that need to be excluded from use?


What types?


What address block? /16

Step 3: Ensure that the private space addresses are consistent with policy

The company should have a network policy and method of allocating addresses. This is true even when using

private addresses. You should contact the FilmCompany network administrators to request a block of

addresses. In this case, ask your instructor if there is a preferred set of addresses to use.

Did your instructor assign a block of addresses?

If so, what block?

If your instructor does not assign addresses, you may choose any private space block that does not conflict.

What block of addresses are you using for this FilmCompany Branch? /22


Task 3: Allocate Addresses for the Network

When assigning addresses to the different networks, start the assignments with the subnet that requires the largest address block and progress to the network that requires the smallest.

Step 1: Order the networks from largest to smallest

Using the information from Lab 6.2.1, list the networks in order of size, from the network that requires the

largest address block to the network that requires the smallest block.

Network/VLAN Name Number of host addresses
Voice 254
support 126
production 126
Future 126
Null 126
administrative 62
Mobile 62
peripherals 62
Web_access 14
Default 14
management 14
Net_admin 14


Step 2: Assign address blocks to the networks

From the address block chosen in the previous task, begin calculating and assigning the address blocks to these networks. You should use contiguous blocks of addresses when making these assignments.

Network/VLAN Name Number of host addresses Network address
Voice 254 /24
support 126 /25
production 126 /25
Future 126 /25
Null 126 /25
administrative 62 /26
Mobile 62 /26
Peripherals 62 /26
web_access 14 /28
Default 14 /28
management 14 /28
net_admin 14 /28

Step 3: Complete the address planning table

Using the addresses you calculated in the previous step, complete this table from Lab 6.2.1. This plan will be used in future labs.



VLAN # Network/VLAN Name Number of host addresses Network Address Description
1 default 14 /28 Default VLAN for the Layer 2 devices
10 voice 254 /24 Voice VLAN to support Voice over IP
20 management 14 /28 Management hosts and secureperipherals (payroll printer)
30 administrative 62 /26 Administrative hosts
40 support 126 /25 Support hosts
50 production 126 /25 High performance productionworkstations (stationary)
60 mobile 62 /26 Mobile production hosts.
70 net_admin 14 /28 Network support
80 servers 65534 /16 Servers to support video services and storage.
90 peripherals 62 /26 Peripherals for general use (printers, scanners)
100 web_access 14 /28 VLAN for server that are publiclyaccessible
120 future 126 /25 VLAN for future services
999 null 126 /25 VLAN for terminating unwanted orsuspicious traffic
NA NAT_pool 6 Addresses for NAT pool for BR4 or interface to ISP4
NA DSL_Link 2 /30 DSL link to the ISP
NA Frame_link 2 Address of the FR link to the stadium


Reflection / Challenge

This lab specifically used private IPv4 addresses. Discuss the issues to be considered if it was decided to use public IP addresses throughout the network. Are there any situations that would require this?

Alamat IP versi 4 (sering disebut dengan Alamat IPv4) adalah sebuah jenis pengalamatan jaringan yang digunakan di dalam protokol jaringan TCP/IP yang menggunakan protokol IP versi 4. Panjang totalnya adalah 32-bit, dan secara teoritis dapat mengalamati hingga 4 miliar host komputer atau lebih tepatnya 4.294.967.296 host di seluruh dunia, jumlah host tersebut didapatkan dari 256 (didapatkan dari 8 bit) dipangkat 4(karena terdapat 4 oktet) sehingga nilai maksimal dari alamt IP versi 4 tersebut adalah dimana nilai dihitung dari nol sehingga nilai nilai host yang dapat ditampung adalah 256x256x256x256=4.294.967.296 host. Alamat publik adalah alamat-alamat yang telah ditetapkan oleh InterNIC dan berisi beberapa buah network identifier yang telah dijamin unik (artinya, tidak ada dua host yang menggunakan alamat yang sama) jika intranet tersebut telah terhubung ke Internet. Ketika beberapa alamat publik telah ditetapkan, maka beberapa rute dapat diprogram ke dalam sebuah router sehingga lalu lintas data yang menuju alamat publik tersebut dapat mencapai lokasinya.

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