Scenario Two: Big Oil and Gas CCSP Course Training in Gurgaon

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Mr. Drew is an IT director at Big Oil and Gas, a medium-sized petrochemical company based in Houston. It also has operations in the Gulf and in South America. Mr. Drew is in charge of the network infrastructure, including routers and switches. His group includes personnel who can install and configure Cisco routers and switches.

The Big Oil and Gas CIO wants to begin migrating from the voice network to an IP telephony solution to reduce circuit and management costs. Existing data WAN circuits have 50 percent utilization or less but spike up to 80 percent when sporadic FTP transfers occur.

Mr. Drew hands you the diagram shown in Figure 17-3. The exiting data network includes 35 sites with approximately 30 people at each site. The network is hub-and-spoke, with approximately 200 people at the headquarters. The WAN links range from 384 kbps circuits to T1 speeds.

Remote-site applications include statistical files and graphical-site diagrams that are transferred using FTP from remote sites to the headquarters.

Mr. Drew wants an IP telephony solution that manages the servers at headquarters but still provides redundancy or failover at the remote site. He mentions that he is concerned that the FTP traffic might impact the VoIP traffic. He wants to choose a site to implement a test before implementing IP telephony at all sites.

Scenario Two Questions

The following questions refer to Scenario Two:

1.	What are the business requirements for Big Oil and Gas?
2.	Are there any business-cost constraints?
3.	What are the network's technical requirements?
4.	What are the network's technical constraints?
5.	Approximately how many IP phones should the network support?
6.	What type of IP telephony architecture should you propose?
7.	What quality of service (QoS) features would you propose for the WAN?
8.	Would you propose a prototype or a pilot?
9.	What solution would you suggest for voice redundancy at the remote sites?
10.	Diagram the proposed solution.

Scenario Two Answers

1.	The company wants to provide voice services in a converged network.
2.	The solution should provide reduced costs over the existing separate voice and data networks.
3.	The technical requirements are as follows: Provide IP telephony over the data network. Provide voice redundancy or failover for the remote sites. Prevent FTP traffic from impacting the voice traffic.
4.	The technical constraint is as follows: Call-processing servers need to be located at headquarters.
5.	There are 200 IP phones at headquarters, and 35 * 30 = 1050 remote IP phones, for a total of 1250 IP phones.
6.	Propose the WAN centralized call-processing architecture with a CallManager (CM) cluster at headquarters.
7.	Use low-latency queuing (LLQ) on the WAN links to give the highest priority to voice traffic. Then define traffic classes for regular traffic and FTP traffic. Make bandwidth reservations for the voice traffic and maximum bandwidth restrictions for the FTP traffic. Call Admission Control (CAC) is recommended to limit the number of calls from and to a remote site.
8.	To prove that calls can run over the WAN links, implement a pilot site. The pilot would test the design's functionality over the WAN with or without FTP traffic.
9.	Recommend the use of Survivable Remote Site Telephony (SRST) to provide voice services in the event of WAN failure, and reroute calls to the Public Switched Telephone Network (PSTN).
10.	Figure 17-4 shows the diagram, which shows headquarters and two remote sites for clarity. This architecture is duplicated for all remote sites. Each site uses a voice router that is connected to both the IP WAN and the PSTN. SRST provides voice survivability in the case of WAN failure. A CM cluster is implemented at the headquarters. The CM servers are in the data center in a redundant network