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NEW QUESTION: 1
If you run the word count MapReduce program with m mappers and r reducers, how many output files will you get at the end of the job? And how many key-value pairs will there be in each file? Assume k is the number of unique words in the input files.
A. There will be r files, each with approximately k/r key-value pairs.
B. There will be m files, each with exactly k/m key value pairs.
C. There will be m files, each with approximately k/m key-value pairs.
D. There will be r files, each with exactly k/r key-value pairs.
E. There will be r files, each with approximately k/m key-value pairs.
Answer: D
Explanation:
Note:
*A MapReduce job withm mappers and r reducers involves up to m*r distinct copy operations,
since eachmapper may have intermediate output going to every reducer.
*In the canonical example of word counting, a key-value pair is emitted for every word found. For
example, if we had 1,000 words, then 1,000 key-value pairs will be emitted from the mappers to
the reducer(s).
NEW QUESTION: 2
A large mobile telephony and data network operator has a data that houses network elements. These are essentially large computers running on Linux. The perimeter of the data center is secured with firewalls and IPS systems. What is the best security policy concerning this setup?
A. The operator knows that attacks and down time are inevitable and should have a backup site.
B. As long as the physical access to the network elements is restricted, there is no need for additional measures.
C. There is no need for specific security measures on the network elements as long as firewalls and IPS systems exist.
D. Network elements must be hardened with user ids and strong passwords. Regular security tests and audits should be performed.
Answer: D
NEW QUESTION: 3
Web applications play a vital role in deploying different databases with user accessibility on the Internet. Which of the following allows an attacker to get unauthorized access to the database of a Web application by sending (attacking) user-supplied data to an interpreter as part of a command or query?
A. Injection flaw
B. Cross Site Scripting
C. Cross Site Request Forgery (CSRF)
D. Malicious File Execution
Answer: A
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