2900282
Question 1
Question
Which of the following is true about typical RPC
Answer
-
Synchronous and transient
-
Synchronous and persistent
-
Nonblocking and transient
-
Synchronous and temporary
Question 2
Question
What is not a common protocol that middleware provides?
Answer
-
Security
-
Transaction
-
Message queuing
-
Concurrency
Question 3
Question
Which of these is not a type of synchronicity?
Answer
-
Persistent asynchronous communication
-
Receipt-based transient synchronous communication
-
Response-based transient synchronous communication
-
Multicast response synchronization
Question 4
Question
This is not an interleaved transmission
Answer
- True
- False
Question 5
Question
Which of the following is false about publish-subscribe
Answer
-
One message might be delivered to multiple recipients
-
Subscriptions may be conditional upon the content of the message
-
The broker is responsible for deciding which subscribers should receive the message
-
The sender specifies which recipients should receive the message
Question 6
Question
Which of these is NOT an issue resolved by Parameter marshaling?
Answer
-
Client and server have different data representations
-
Client and server have to agree on the same encoding
-
Interpreting data and transforming it into machine dependent representation
-
Generating stubs to interface with server side application
Question 7
Question
What does Message-oriented communication typically allow over traditional RPC?
Answer
-
Asynchronous communication
-
Persistent communication
-
Reliable communication
-
Multicast RMI
Question 8
Question
When is stream-oriented communication appropriate?
Answer
-
When the the temporal relationship between different data items is essential
-
When large blocks of data such as video files are involved
-
When reliable communication is not required
-
When buffering is not acceptable
Question 9
Question
Which of the following is true about Persistent synchronous communication if the recipient is not running
Answer
-
The message is stored and the sender receives accepted acknowledgement immediatley
-
The message is stored and the sender receives accepted acknowledgement when the recipient starts
-
The sender is blocked until the receiver starts
-
The message is discarded and the sender is notified when the receiver starts
Question 10
Question
Which is true about Transient asynchronous communication if the reciever is not running
Answer
-
The message will not be received but the sender won't be blocked
-
The message will be queued until the receiver starts
-
The sender will automatically retry until receiver starts
-
The message will not be received and the sender will be blocked
Question 11
Question
Which of the following is true about parameter specifications and stubs?
Answer
-
Parameters passed by value do generally pose any problems
-
It is only possible to pass parameters by value if they are primitive data types
-
Interfaces (procedures) are often specified in Interface Definition Languages (IDL) and compiled into stubs
-
It is completely impossible to pass parameters by reference
Question 12
Question
What type of communication is this?
Answer
-
Receipt-based transient synchronous communication
-
Transient asynchronous communication
-
Delivery-based transient synchronous communication at message delivery
-
Persistent synchronous communication
Question 13
Question
What are the basic operations of a message queue?
Answer
-
Put, Get, Poll, Notify
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Push, Get, Poll, Notify
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Pop, Get, Poll, Subscribe
-
Put, Get, Notify, Acknowledge
Question 14
Question
What is the main role of a message broker?
Answer
-
To transform messages from sender's format to receive'’s format
-
To handle retries if a receiver fails to acknowledge the message
-
To manage who is authorized to subscribe to which queue
-
To balance messages between multiple storage queues
Question 15
Answer
-
Traditional RPC
-
Asynchronous RPC
-
Passing a value by reference
-
A callback following an asynchronous RPC
Question 16
Question
Which layer does the middleware layer sit between?
Answer
-
Application and transport
-
Transport and network
-
Application and network
-
Operating system and Network
Question 17
Question
What kind of communication is this?
Answer
-
Persistent asynchronous communication
-
Persistent synchronous communication
-
Response-based transient synchronous communication
-
Transient asynchronous communication
Question 18
Question
Is the caller of an RPC usually blocked while waiting for a result?
Answer
- True
- False
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