The following questions pertain to the Internet Directory Service and the related DNS protocol. Joe is...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
The following questions pertain to the Internet Directory Service and the related DNS protocol. Joe is developing on a Web site that has multiple replicated servers located throughout the Internet. He plans to use DNS to help direct clients to their nearest lightly-loaded server and comes up with the following hierarchical scheme. Joe has divided his server replicas into three groups (east, west, and central) based on their physical location. Based on Joe's design, typical query occurs as follows: When a client makes a query for www.distributed.joe.com, the root .com name server is contacted first. It returns the name server (NS) record for ns1.joe.com (along with a corresponding A record). The TTL of this record is set to 1 day. The ns1.joe.com name server is then queried for the address. It examines the source of the name query and returns an NS record for one of {east-ns, central-ns, west- ns}.distributed.joe.com (along with a corresponding A record). The choice of which name server is based on where ns1 thinks the query came from. Finally, one of {east-ns, central-ns, west-ns}.distributed.joe.com is contacted and it returns an address (A) record for the most lightly loaded web server in its region. The following questions are based on Joe design. 6.a. (4 points) Joe's name server software has only two choices for TTL settings for A and NS records - 1 day and 1 minute. What are reasonable TTLs for the following records and explain why? NS record for {east-ns, central-ns, west-ns}.distributed.joe.com? A record for {east-ns, central-ns, west-ns}.distributed.joe.com? A record returned for the actual Web server? Joe's Web site is especially popular among students at his university. The university network administrators estimate that there is one access from university every 5 minutes. Each access results in the application resolving the name www.distributed.joe.com. Assume the following: No other queries are made from the university All university clients use the same local name server Web browsers do not do any caching on their own. 6.b. (5 points) How many accesses will be made to the following name servers each hour to resolve these queries? Use your answers to the previous question, and explain your calculation: ROOT ns1.joe.com one of {east-ns, central-ns, west-ns}.distributed.joe.com 6.c. (Extra Credit) Joe finds that many people are far away (i.e. communication has high latency) from the name servers that they use. Why might this be a problem for his scheme? The following questions pertain to the Internet Directory Service and the related DNS protocol. Joe is developing on a Web site that has multiple replicated servers located throughout the Internet. He plans to use DNS to help direct clients to their nearest lightly-loaded server and comes up with the following hierarchical scheme. Joe has divided his server replicas into three groups (east, west, and central) based on their physical location. Based on Joe's design, typical query occurs as follows: When a client makes a query for www.distributed.joe.com, the root .com name server is contacted first. It returns the name server (NS) record for ns1.joe.com (along with a corresponding A record). The TTL of this record is set to 1 day. The ns1.joe.com name server is then queried for the address. It examines the source of the name query and returns an NS record for one of {east-ns, central-ns, west- ns}.distributed.joe.com (along with a corresponding A record). The choice of which name server is based on where ns1 thinks the query came from. Finally, one of {east-ns, central-ns, west-ns}.distributed.joe.com is contacted and it returns an address (A) record for the most lightly loaded web server in its region. The following questions are based on Joe design. 6.a. (4 points) Joe's name server software has only two choices for TTL settings for A and NS records - 1 day and 1 minute. What are reasonable TTLs for the following records and explain why? NS record for {east-ns, central-ns, west-ns}.distributed.joe.com? A record for {east-ns, central-ns, west-ns}.distributed.joe.com? A record returned for the actual Web server? Joe's Web site is especially popular among students at his university. The university network administrators estimate that there is one access from university every 5 minutes. Each access results in the application resolving the name www.distributed.joe.com. Assume the following: No other queries are made from the university All university clients use the same local name server Web browsers do not do any caching on their own. 6.b. (5 points) How many accesses will be made to the following name servers each hour to resolve these queries? Use your answers to the previous question, and explain your calculation: ROOT ns1.joe.com one of {east-ns, central-ns, west-ns}.distributed.joe.com 6.c. (Extra Credit) Joe finds that many people are far away (i.e. communication has high latency) from the name servers that they use. Why might this be a problem for his scheme?
Expert Answer:
Related Book For
Auditing and Assurance services an integrated approach
ISBN: 978-0132575959
14th Edition
Authors: Alvin a. arens, Randal j. elder, Mark s. Beasley
Posted Date:
Students also viewed these computer network questions
-
Planning is one of the most important management functions in any business. A front office managers first step in planning should involve determine the departments goals. Planning also includes...
-
can someone solve this Modern workstations typically have memory systems that incorporate two or three levels of caching. Explain why they are designed like this. [4 marks] In order to investigate...
-
Why does Erasmus attack Church officials in his In Praise of Folly? O For spending money on lavish art O For not allowing clergy to marry O For supporting military campaigns O For selling pardons and...
-
Cause-related sponsorship can be used to achieve very different objectives than those of sports-, arts- or media-related sponsorship. Discuss this notion and illustrate with examples.
-
In the context of this chapter, what is meant by having a preference for fairness?
-
In an Accountemps survey of 150 senior executives, 47% said that the most common job interview mistake is to have little or no knowledge of the company.
-
Tom and Julie formed a management consulting partnership on January 1, 2008. The fair value of the net assets invested by each partner follows: During the year, Tom withdrew $15,000 and Julie...
-
How many pints of milk must be purchased for 148 servings, if each person is to receive 4.8 ounce glass? show your solution
-
The director of RCM inc. plans to launch a new product. The initial investment in equipment and other fittings is $800,000. It's been a while since management thinking of launching this new product....
-
Listen to Steve Jobs explain what being an entrepreneur is like- https://www.youtube.com/watch?v=gFE-Tdz24hM Listen to Malcolm Galdwell talk about spaghetti...and relate it eventually to personalized...
-
If you were given $10,000 to start a business or to develop a new product or service, what type of business would you start, or what type of product or service would you offer? Use at least one...
-
The prices of cigarettes and alcohol have experienced sharp increases in price over the last seven years. In spite of these price increases the revenue of these companies has continued to increase....
-
The Ogallala Aquifer is a large underground pool of freshwater beneath several states in the western United States. Any farmer with land above the aquifer can currently pump water out of it. Which of...
-
According to Jim Myers, president of the American Chamber of Commerce in South Africa, nearly 50% of the chambers members are Fortune 500 companies, and that over 90% operate beyond South Africas...
-
Many Americans regularly drive their own cars to work rather than use public transportation or form a carpool. 1) How do you know that each person in a single-passenger vehicle during rush hour is...
-
You have to write a letter to Sindh Government to set up a water filtration plant based on the new research. The letter should be comprehensive and encompass the following a. Company profile...
-
The following information is available for Partin Company: Sales $598,000 Sales Returns and Allowances 20,000 Cost of Goods Sold 398,000 Selling Expense 69,000 Administrative Expense 25,000 Interest...
-
The following are the eight balance-related audit objectives, six tests of details of balances for accounts receivable, and seven tests of controls or substantive tests of transactions for the sales...
-
Section 404(a) of the Sarbanes-Oxley Act requires management to issue a report on internal control over financial reporting. Identify the specific Section 404(a) reporting requirements for management.
-
Multiple Choice Questions The following questions deal with auditing year-end cash. Choose the best response. a. A CPA obtains a January 10 cutoff bank statement for a client directly from the bank....
-
While there is strong consensus among economists in favor of central bank independence, political support seems to be waning. What factors may have contributed to the rise in the political threat to...
-
How does the time consistency problem apply to the conduct of monetary policy? How might long terms of office for central bankers help overcome it?
-
Consider the following data for Country A and Country B: Use these data to show that the ratio of public debt to GDP is expected to stabilize in Country A but not in Country B. How might this impact...
Study smarter with the SolutionInn App