66. Which of these class must be used to send a datagram packets over a connection?

1. 1. DatagramSocket

   
   
   

   2. InetAdress

   
   
   

   3. DatagramPacket

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   By using 5 classes we can send and receive data between client and server, these are InetAddress, Socket, ServerSocket, DatagramSocket, and DatagramPacket.

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67. Which of these method of DatagramPacket class is used to find the destination address?

1. 1. whois()

   
   
   

   2. findAddress()

   
   
   

   3. getAddress()

   
   
   

   4. Address()

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   getAddress()

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68. Which object is used by spring for authentication?

1. 1. AnonymousHolder

   
   
   

   2. SecurityContextHolder

   
   
   

   3. ContextHolder

   
   
   

   4. SecurityHolder

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   The SessionManagementFilter checks the contents of the SecurityContextRepository against the current contents of the SecurityContextHolder to determine whether user has been authenticated during the current request by a non-interactive authentication mechanism, like pre authentication or remember me.

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69. Which API gets the SocketAddress (usually IP address + port number) of the remote host that this packet is being sent to or is coming from.

1. 1. address()

   
   
   

   2. InetAddress

   
   
   

   3. getAddress()

   
   
   

   4. getSocketAddress()

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   getSocketAddress() is used to get the socket address.

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70. What is Remote method invocation (RMI)?

1. 1. RMI allows us to invoke a method of java object that executes on another Thread in multithreaded programming

   
   
   

   2. RMI allows us to invoke a method of java object that executes parallely in same machine

   
   
   

   3. RMI allows us to invoke a method of java object that executes on another machine

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Remote method invocation RMI allows us to invoke a method of java object that executes on another machine.

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