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chipchipzzz
08-07-2003, 10:04 AM
AAA Video operates a chain of 50 video rental stores located in the Northwestern United States. They currently have a Point-of-Sale (POS) system in which each store posts its daily sales data and inventory changes to a central database through dial-up communication. There is no interaction between the stores and the central system during business hours. The central site runs on an Ethernet LAN. The only alwayson WAN link is an Internet connection using wireless broadband to a local ISP. AAA wants to enhance their service offering by creating a new E-Commerce web site where customers can browse and search a catalog of video titles and select the ones they want for rental. The system will instantly communicate the order to the nearest store where employees pull the order and hold it until the customer picks it up. The service must operate on a 24x7 basis. AAA sees this new business strategy as a means to increase revenue and expand the business nationally. They see an opportunity to expand the web site in the future to video, DVD and music sales on a worldwide level. The company wants all stored to be connected to the central site through WAN links. The company is upgrading the central inventory database so that sales and rentals can be posted immediately in real-time. An Internet-based email and instant-messaging system will be set up for all headquarters employees and store managers to use. AAA believes that networking the stores will improve order fulfilment processes which will improve customer satisfaction and thus, boost revenue. It will also help communication with store employees. AAA wants to upgrade the local LAN to a Gigabit and Fast Ethernet system to facilitate the demands of the new and upgraded systems. They have budgeted $500,000 for the networking equipment and another $10,000/month for the WAN charges including a faster Internet connection. They believe that 256Kbps speeds will be adequate to the stores. Since they have no staff capable of managing the new network, they will hire two engineers that already have the training and experience. The project must be complete in 6 months when the new inventory system goes online. The IT manager has concerns about the security of the servers and workstations on the network when all stores become connected. He doesn’t want any Internet access to or from the stores. He is depending on you to recommend an effective yet affordable solution that will protect his system from intruders.

What are three technical goals of AAA Video with regard to this network design project? (Choose three)

A. Sell merchandise through the E-Commerce site.
B. Real-time posting of sales.
C. Network security measures.
D. Hire two new network engineers.
E. Upgrade to a high-performance LAN.
F. Enhance service offerings.

Which two are business constraints imposed by the AAA Video Company on this new network design project? (Choosetwo)

A. The new Internet-based messaging system.
B. $500,000 equipment budget.
C. No Internet access to stores.
D. Upgrade to Gigabit Ethernet.
E. The existing POS system.

Which two are business goals of AAA video that apply to this network design project? (Choose two)

A. Improvement of the order fulfilment process.
B. Production deployment in 6 months.
C. New messaging systems.
D. The hiring of skilled IT staff.
E. Increase revenue through the E-Commerce site.

Which are two technical goals of AAA Video with regard to this network design project? (Choose two)

A. 24x7 availability of the E-Commerce web site.
B. Complete the project in 6 months.
C. Keep WAN chargers below $10,000/month.
D. Full-time network communication to all stores.
E. Improve the order fulfilment process.

it_email
11-07-2003, 03:35 PM
Xỉu!
Thế anh có định post bài tiếp ko?

chipchipzzz
11-07-2003, 03:55 PM
it_email,
case trên là một dạng trong khi thi CCDA
CCDA đòi hỏi khả năng đọc hiểu, phân tích hệ thống mạng, từ đó đưa ra giải pháp phù hợp cho từng trường hợp.
Chip sẽ từ từ post thêm các vấn đề khác trong chương trình CCDA để các bạn tiếp tục tham khảo.

TGA_Certificationteam
22-07-2003, 12:31 PM
Case này chính xác nằm trong kỳ thi CCDA version 861.

Hi hi, chổ câu Business constraint , mình nhớ đã trả lời là 500k và ... no Internet access, how stupid

batigol
22-07-2003, 08:02 PM
Mình mới fail môn này tuần trước. Đi thi gặp đúng câu như case ở trên. Điểm pass hơi cao 825 (đề của của mình có 62 câu, làm trong 105 phút). Chỉ may mắn chút nữa thì pass môn này. Mình được 806. Thú thực đi thi chưa đọc về ipv6 và ip telephony chút nào, còn SAFE thì có khái niệm chút ít. Đối với mình thời gian 105 phút là hơi gấp. Một vài điều chia sẻ.

dangquangminh
23-07-2003, 10:17 AM
BATIGOL,

Hy vọng là lần sau bạn sẽ nhanh chóng pass và có CCDA.

Kinh nghiệm khi thi CCDA của mình như sau:

1. Xin nhiều giấy trắng để có thể ghi chép (tối thiểu 6 tờ).
2. Cả đề thi sẽ có khoảng 3 đến 4 scenarios. Khi đọc một scenario nào đó lần đầu tiên, bạn chú ý take notes. Mỗi scenario như vậy, bạn ghi chú lên một tờ giấy riêng. Khi scenario đó xuất hiện một lần nữa, bạn chỉ cần đọc lại các ghi chú trước đó. Việc này giúp bạn đỡ tốn thời gian.
3. Cách hỏi của CCDA cũng khá lắt léo. Bạn cần chú ý đọc kỹ câu hỏi.
4. các chủ đề mới xuất hiện như ip v.6, Ip telephony, Voip...đều có thể gặp. bạn cần phải biết về công nghệ này.

Cám ơn bạn đã đọc.

batigol
23-07-2003, 12:03 PM
Dear anh Minh,

Cám ơn những lời khuyên của anh. Em sẽ chuẩn bị tốt hơn cho lần thi sau.
Có nhiều câu hỏi trong Testk!ng chưa có câu trả lời, anh có thể giúp em trả lời các câu đó được không.

Your help is many thanks,

dangquangminh
23-07-2003, 01:43 PM
Hi batigol,

bạn có thể post lên đây mọi câu hỏi. Các thành viên của diễn đàn sẽ thảo luận. bạn có thể sẽ tìm thấy đáp án đúng nhất thông qua các thảo luận đó.

Mình chỉ lưu ý các bạn cách đặt câu hỏi trên diễn đàn này. Khi bạn đặt câu hỏi, nên chứng tỏ cho mọi người là bạn đã có tìm hiểu thông tin về vấn đề đó nhưng vẫn gặp khó khăn. Tránh trường hợp trích dẫn câu hỏi trong Boson/******** mà không chịu khó suy nghĩ hay tìm tòi trước.

Mến chúc batigol thành công và nhanh chóng có CCDA.

Minh

tieuyen
29-10-2003, 09:15 AM
Chào các bạn. Mình gặp 2 câu hỏi trong ******** về vấn đề VoIP. Họ đã đưa ra đáp án nhưng mình vẫn chưa phân định 1 cách rạch ròi về giải thích của họ giữa lợi ích (Advantage) và lí do (Reason) khi triển khai VoIP trong case study này:

The West Ridge School District in North Carolina has approximately 2,800 students occupying five schools: three grade schools, one junior high, and one high school. All telephone service is handled by the local phone company. Every phone call is switched by the providers centrex switch, then routed to the appropriate school.
Each school is networked with fractional T1 Frame Relay and Cisco routers. The users are on a switched 10/1/100 network utilizing Cisco switched and Category 5 cable.
Internet access is through the high school which has an Internet connection through a provider 35 miles away via a T1 Frame Relay.
The school district needs to put phones in each classroom for compliance with the Safe- Schools initiative, but the cost is high and facilities are lacking. In addition to the phones, the district would like to install video in each school for video conference and for distance learning in the high school. Video partners will be connected with ISDN PRI LINKS.
There is also a need to protect the student information stored on local serves and shared between the schools are as students graduate from elementary school to junior high, and students transfer in and out of the district.
QUESTION NO: 90
Which two are advantages of suggesting IP telephony to this customer? (Choose two)
A. Voice, video and data run on the same Cat5 cable.
B. Long distance charges can be reduced by running VoIP.
C. All reliance on the local phone company can be eliminated.
D. The cost of adding additional telephones is minimal.
Answer: A, D
Explanation: Voice, video and data can utilize the same Cat 5 infrastructure and the cost of additional phones would be reduced because the local phone company would not have to add additional lines
Incorrect answers: C, B
Long distance charges would not be reduced because calls outside the network would still utilize the
long distance provider. You would still use the local phone company for calls outside the network.
QUESTION NO: 91
What are two reasons for moving to a converged network at this time? (Choose two)
A. Cost savings by using a single cabling system.
B. Reduction of long distance chargers by using VoIP.
C. Can increase the number of phones without upgrading outside facilities.
D. Eliminate reliance on local provider for any future phone calls.
Answer: B, C
Explanation: By implementing VoIP, we can definitely reduce phone charges if a percentage of calls are made internally. The second advantage is that we can have full control over the network without upgrading external facilities. In this case, phones can be added w/o
contacting the telco.
Incorrect Answers
A Cost-savings are not dependent on cabling systems.
D You cannot totally eliminate the reliance on the local provider as
external calls still need to be public-switched.

Nhờ các bạn xem và cùng thảo luận.
Xin cảm ơn

tieuyen
29-10-2003, 09:38 AM
Mời anh Minh và các bạn xem và cùng thảo luận một số câu khá khó trong ******** chưa có lời giải nhé. các bạn chú ý nên đưa ra 1 lời giải thích kèm theo đáp án của mình để mọi người cùng xem và tìm ra phương án đúng nhất cho mỗi tình huống:

QUESTION NO: 104
How is subnetworking achieved in IPv6?
A. Site Level Aggregator in IPv6 addresses
B. Subnetworks are assigned by Public Authorities
C. Subnetworking is not allowed in IPv6
D. IPv4 compatible IPv6 addresses
E. Subnetworks are assigned by Internet Service Providers

QUESTION NO: 106
Which two are the primary sources for documenting a customer's requirements for a network design project?
A. network application specifications
B. request for proposal (RFP)
C. diagram of desired network
D. network performance specifications
E. interview with customer

QUESTION NO: 115
You work for a stock brokerage firm that is opening a new office in Madrid. A dozen
stock traders will require constant data access to exchange all around the world. This access must be fast and without interruption.
Which two feature can help you provide this level of connectivity? (Choose two)
A. CDP
B. IGRP
C. CoS
D. QoS
E. GoS

QUESTION NO: 118
Two locations of a company's network are connected with a satellite point-to-point link. Data communications over this link experience low response time and very low error rates.
Which sentence describes the effect of flow control using windows size for the highest end-to-end throughput?
A. A large window size minimizes the number of acknowledgments
B. A small window size will reduce the number of retransmissions
C. A small window size would improve performance
D. there is not enough information to determine the effect window size

QUESTION NO: 119
Which statement describes IPv6 address route summarization?
A. IPv6 addresses have to converted to IPv4 addresses to be router summarized
B. Classless inter domain routing (CIDR) for IPv6 automatically perform route
summarization
C. IPv6 address cannot use route summarization
D. IPv6 address have built in router summarization based on Top level aggregators, Next Level aggregators and Site Level aggregators
E. The routers in the IPv6 network use proprietary protocols to optimize router
summarization based on the size of their routing tables

dangquangminh
03-11-2003, 08:20 AM
Chào các bạn. Mình gặp 2 câu hỏi trong ******** về vấn đề VoIP. Họ đã đưa ra đáp án nhưng mình vẫn chưa phân định 1 cách rạch ròi về giải thích của họ giữa lợi ích (Advantage) và lí do (Reason) khi triển khai VoIP trong case study này:

The West Ridge School District in North Carolina has approximately 2,800 students occupying five schools: three grade schools, one junior high, and one high school. All telephone service is handled by the local phone company. Every phone call is switched by the providers centrex switch, then routed to the appropriate school.
Each school is networked with fractional T1 Frame Relay and Cisco routers. The users are on a switched 10/1/100 network utilizing Cisco switched and Category 5 cable.
Internet access is through the high school which has an Internet connection through a provider 35 miles away via a T1 Frame Relay.
The school district needs to put phones in each classroom for compliance with the Safe- Schools initiative, but the cost is high and facilities are lacking. In addition to the phones, the district would like to install video in each school for video conference and for distance learning in the high school. Video partners will be connected with ISDN PRI LINKS.
There is also a need to protect the student information stored on local serves and shared between the schools are as students graduate from elementary school to junior high, and students transfer in and out of the district.
QUESTION NO: 90
Which two are advantages of suggesting IP telephony to this customer? (Choose two)
A. Voice, video and data run on the same Cat5 cable.
B. Long distance charges can be reduced by running VoIP.
C. All reliance on the local phone company can be eliminated.
D. The cost of adding additional telephones is minimal.
Answer: A, D
Explanation: Voice, video and data can utilize the same Cat 5 infrastructure and the cost of additional phones would be reduced because the local phone company would not have to add additional lines
Incorrect answers: C, B
Long distance charges would not be reduced because calls outside the network would still utilize the
long distance provider. You would still use the local phone company for calls outside the network.
QUESTION NO: 91
What are two reasons for moving to a converged network at this time? (Choose two)
A. Cost savings by using a single cabling system.
B. Reduction of long distance chargers by using VoIP.
C. Can increase the number of phones without upgrading outside facilities.
D. Eliminate reliance on local provider for any future phone calls.
Answer: B, C
Explanation: By implementing VoIP, we can definitely reduce phone charges if a percentage of calls are made internally. The second advantage is that we can have full control over the network without upgrading external facilities. In this case, phones can be added w/o
contacting the telco.
Incorrect Answers
A Cost-savings are not dependent on cabling systems.
D You cannot totally eliminate the reliance on the local provider as
external calls still need to be public-switched.

Nhờ các bạn xem và cùng thảo luận.
Xin cảm ơn

Hi,

trong trường hợp đầu, bạn có thể dùng phương pháp loại trừ. Khi bạn triển khai dịch vụ IP telephony, bạn vẫn phải dựa vào local telepone company cho những cuộc gọi đường dài. Do đó, ta không thể chọn "All reliance on the local telephone company can be eliminated".

Cũng cùng lý do trên, bạn cũng vẫn phải dùng công nghệ PSTN truyền thống cho những cuộc gọi đường dài trong case này. Và đó là lý do mục B không được chọn.

Qua câu hỏi số 91:

Bạn có thể chọn A và C. IP Telephony cho phép bạn dùng cùng một loại cable như dịch vụ data truyền thống. Đó là lý do bạn ko cần tốn thêm chi phí cho việc đầu tư một hệ thống cáp cho voice. Ngoài ra, mỗi khi muốn tăng thêm một người dùng đầu cuối, bạn chỉ cần gắn thêm một IP phones vào hệ thống mạng sẵn có.

Mong được tiếp tục trao đổi,

tieuyen
10-11-2003, 02:05 PM
Cảm ơn anh Minh nhiều nha. Còn các câu hỏi ở trên em chọn là:
104. A
106. B, E
115. C, D
118. D
119. Nho anh chi gium :-)
Anh kiem tra ho em em co dung hay sai nhe'
Regards

dangquangminh
12-11-2003, 01:59 PM
tieuyen:

106. Hai nguồn thông tin để bạn có thể thu thập các nhu cầu của khách hàng là thông qua các tài liệu mời thầu (request for proposal) và thông qua quá trình phỏng vấn khách hàng trực tiếp. Do đó, đáp án của bạn là...
ok.

115. CoS và QuoS là các công cụ đảm bảo chất lượng dịch vụ. Trong scenario này, để đảm bảo các nhân viên ở khắp mọi nơi có thể trao đổi dữ liệu thường xuyên và liên tục, ta nên triển khai hai công cụ này.

118. Dùng large Windows size.

thân,