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NEW QUESTION: 1
Given the code fragments:
class Employee {
Optional<Address> address;
Employee (Optional<Address> address) {
this.address = address;
}
public Optional<Address> getAddress() { return address; }
}
class Address {
String city = "New York";
public String getCity { return city: }
public String toString() {
return city;
}
}
and
Address address = null;
Optional<Address> addrs1 = Optional.ofNullable (address);
Employee e1 = new Employee (addrs1);
String eAddress = (addrs1.isPresent()) ? addrs1.get().getCity() : "City Not
available";
What is the result?
A. A NoSuchElementException is thrown at run time.
B. City Not available
C. New York
D. null
Answer: D
NEW QUESTION: 2
トポロジーを考慮して、ゾーンAとゾーンBで構成する必要があるゾーンタイプはどれですか？
A. レイヤー2
B. 仮想ワイヤー
C. レイヤー3
D. タップ
Answer: C
NEW QUESTION: 3
An Amazon RDS database instance is used by many applications to look up historical data. The query rate is relatively constant. When the historical data is updated each day, the resulting write traffic slows the read query performance and affects all application users.
What can be done to eliminate the performance impact on application users?
A. Use Amazon DynamoDB instead of Amazon RDS to buffer the read traffic.
B. Create an RDS Read Replica and direct all read traffic to the replica.
C. Implement Amazon ElastiCache in front of Amazon RDS to buffer the write traffic.
D. Make sure Amazon RDS is Multi-AZ so it can better absorb increased traffic.
Answer: B
Explanation:
Explanation
https://aws.amazon.com/rds/details/read-replicas/
NEW QUESTION: 4
In which two ways does the Open DNS infrastructure ensure reliability? (Choose two)
A. it limits caching to reduce the Incidence of state and dead links
B. ft uses a self-healing network to protect against individual failures
C. Regional sites load-balance among one another to prevent bottlenecks
D. Its networks are geographical
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