Question

As an engineer working for CableComm you are assigned to work on a project that involves moving 90 people to the 10^th floor of a building (Schuylkill View) in Philadelphia. This space is overflow from another building in Philadelphia (CableComm1) that is completely full. The 10^th floor will be on its own network segment. All 90 people will have desktop computers and IP phones. A DHCP server will be installed on the 10^th floor. A network engineer provides you the following information about available networks (subnets) that can be used for this project.

Location	Subnet/mask	Gateway address
CableComm1 8th floor	10.10.0.0/23	10.10.0.1
CableComm1 9th floor	10.10.2.0/24	10.10.2.1
Available	10.10.3.0	10.10.4.1
CableComm1 10th floor	10.10.4.0/24	10.10.6.1
CableComm1 10th floor (Reserved)	10.10.5.0
CableComm1 11th floor	10.10.6.0/24­­­
Available	10.10.7.0
Available	10.10.8.0
Available	10.10.9.0

1. (5) Define the network that suit the needs for the 90 people in the same format used above.

Schuylkill View 10th floor

2. (5) Include the range of dynamic IP addresses that will be available to the 10^th floor.

3. (5) Explain how you arrived at your answer.

(5) Describe an additional role that could be configured on the DHCP server

Answer 1

A)

Location	Subnet/Mask	Gateway
Schuylkill View 10th floor	10.10.7.0/25	10.10.7.1

Explanation:

The network that suits the requirement is “/25” which can facilitate (100%) 126 hosts unlike /24 which can use about 50% of available major network address space.In general, the first assignable IP is configured in the Router/ISP gateway which is 10.10.7.1 in this case You may assign any IP according to your choice.

B)

Range of dynamic IP Addresses that will be available on the 10^th floor:

10.10.7.1 – 10.10.7.126

Explanation: given,

Available Network ID: 10.10.70

WildCard Mask: 255.255.255.128

Using VLSM (Variable length subnet mask), we can assign the IP’s.

Available IP addresses in a major network: 126

Number of IP addresses needed: 90

Available IP addresses in allocated subnets: 126

About 100% of available major network address space is used

About 71% of subnetted network address space is used

Assugnable Range: 10.10.7.1 – 10.10.7.126

Broadcast Address: 10.10.7.127

C)

we are having a requirement of setting up the network for 90 employees on the 10^th floor which is already occupied. According to the network sheet provided by network Engineer, we got to know about the available network addresses such as 10.10.7.0, 10.10.8.0 and 10.10.9.0.

By opting 10.10.7.0 Network ID with the requirement to setup 90 host/end devices we have to configure in such a manner that will save the network bandwith. VLSM(variable length subnet mask) facilities our need by assigning 255.255.255.128 which is equal to /25 or say, 126 hosts. So we will configure networks as mentioned below:

Network ID: 10.10.7.0/25

Netmask: 255.255.255.128

First Assignable IP: 10.10.7.1

Last Assignable IP: 10.10.7.126

Broadcast ID: 10.10.7.127

Note: we can assign any 90 IP’s as per your choice.(ex- 10.10.7.2 – 10.10.7.91)

Gateway to Router/ISP: 10.10.7.1

D) An additional role that can be configured on the DHCP server would be to set up a new DHCP pool for Schuylkill view 10^th floor with following details/command.

IP DHCP pool “pool name” //(Schuylkill)

Default- router 10.10.7.1 (Router Gateway)

DNS-server (Server IP) //say 4.4.4.4

Domain-name schyulkill.com

IP DHCP excluded-address 10.10.7.92-10.10.7.126 (You ca also exclude addresses of other companies such as 10.10.1.0, 10.10.2.0 etc)