The ABC company has three office campus locations at: San Francisco, CA (denote by CA), Princeton, NJ (NJ) and Dallas, TX (TX). The goal is to design a private corporate network which facilitates seamless connectivity between employees and provides access to content/file servers located at the TX site. Additional details for the design are given below

1. Each site is a campus consisting of open space and 3-4 buildings (assume single level buildings for simplicity; Physical campus size: CA ~1Kmx1Km; NJ ~500mx500m and TX ~1Kmx1Km.

2. Number of employees: CA-10,000, NJ-5000, TX-12,000.

3. Each employee has 2 devices: a desktop PC and a laptop computer. The PC connects to a wired network and the laptop is served by WiFi.

4. User traffic is as follows: Both PCs and laptops each generate 20 web accesses per hour during the busy hour (2-3PM). For simplicity assume each web access consists of a 500B query to an external (public) website and a 2 MB web page download.

In addition, users retrieve 12 large files per hour (e.g. video, programs, data) from the company servers located at the TX site, also during the busy hour. Assume that the average query size 200B and average size of each file retrieved is 125MB.

5. Wired network service @100 Mbps for PCs, @1 Gbps for servers.

6. Wireless (802.11g) service @54 Mbps for laptop users (note: assume a maximum coverage range of 100m). WiFi APs each require a 100 Mbps wired Ethernet port.

Design an IP-based network that provides the required network services (as specified above) across the three company sites. Your answer should concentrate on Layer 2 & 3 functionality and must provide a complete view of components and protocols used. Use the following outline:

A high-level drawing of the whole network, identifying each major component in both the private and public parts of the system. The diagram should show overall network topology, key network elements (each labeled as Ethernet switch, IP router, DHCP server, BGP Gateway, etc.), hierarchical organization of networks and connections to the global Internet.

Specify data and control protocol stacks used at typical network elements for (a) WiFi access, L2 switching and L3 routing in the private network; (b) L3 routing in the public network; and (c) end-to-end data transfer for the web browsing application.

Calculate the bandwidth requirement from each site (CA, NJ and TX) to the public Internet. Also assuming that there is a dedicated link or IP tunnel between sites, calculate the necessary inbound and outbound traffic capacity in Gbps for NJ-TX and CA-TX. [State any additional numerical assumptions clearly]

How many WiFi APs are needed to cover each of the three campus sites taking into account coverage requirements? For simplicity, assume each WiFi AP covers a square area of 100mx100m.

Given that there are 100 servers at the TX site, calculate how many 1 Gbps and 100 Mbps Ethernet ports are needed at each site. [State any additional numerical assumptions clearly]