Which constructor of DatagramSocket class is used to creates a datagram socket and binds it with the given Port Number?

DatagramSocket(int port, InetAddress address)

If a datagram router goes down then …………..

only those packets which are queued in the router at that time will suffer

only those packets which are not queued in the router atthat time will suffer

What is route poisoning?

It describes when a router sets the metric for a downed link to infinity

It sends back the protocol received from a router as a poison pill, which stops the regular updates. The use of variable length subnet masks is permitted

It is information received from a router that can’t be sent back to the originating router.RIPv2 supports classless routing

It prevents regular update messages from reinstating a route that has just come up

It describes when a router sets the metric for a downed link to infinity

Which statement is true regarding classless routing protocols?

The use of variable length subnet masks is permitted

The use of discontinuous networks is not allowed

The use of variable length subnet masks is permitted

RIPv1 is a classless routing protocol

RIPv2 supports classless routing

Which methods are commonly used in ServerSocket class?

public OutputStream getOutputStream()

public synchronized void close()

IT-A Lab Quiz Group 2

1.

Which class is used to create servers that listen for either local client or remote client programs?
- A.
  
  ServerSockets
- B.
  
  HttpServer
- C.
  
  HttpResponse
- D.
  
  None of the above
Correct Answer
A. ServerSockets

Explanation
ServerSockets is the correct answer because it is a class in Java that is used to create servers that listen for either local client or remote client programs. This class allows the server to establish a connection with the client and exchange data over the network. It provides methods to bind the server to a specific port and address, accept incoming client connections, and handle the communication between the server and the client.

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2.

Which constructor of DatagramSocket class is used to creates a datagram socket and binds it with the given Port Number?
- A.
  
  DatagramSocket(int port)
- B.
  
  DatagramSocket(int port, InetAddress address)
- C.
  
  DatagramSocket()
- D.
  
  None of the above
Correct Answer
B. DatagramSocket(int port, InetAddress address)

Explanation
The constructor DatagramSocket(int port, InetAddress address) is used to create a datagram socket and bind it with the given Port Number. This constructor allows the user to specify both the port number and the IP address to bind the socket to.

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3.

What is an example of a MAC address
- A.
  
  Az32:6362:2434
- B.
  
  BA:281x:8288
- C.
  
  101:354:665:8734:ffd6:8023
- D.
  
  A625:cbdf:6525
Correct Answer
D. A625:cbdf:6525
4.

If a datagram router goes down then …………..
- A.
  
  All packets will suffer
- B.
  
  Only those packets which are queued in the router at that time will suffer
- C.
  
  Only those packets which are not queued in the router atthat time will suffer
- D.
  
  No packets will suffer
Correct Answer
B. Only those packets which are queued in the router at that time will suffer

Explanation
When a datagram router goes down, only those packets which are queued in the router at that time will suffer. This is because the router is responsible for forwarding packets to their intended destinations. If the router is down, it cannot process and forward the packets that are currently in its queue. However, packets that have already been forwarded and are in transit will not be affected.

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5.

What is route poisoning?
- A.
  
  It sends back the protocol received from a router as a poison pill, which stops the regular updates. The use of variable length subnet masks is permitted
- B.
  
  It is information received from a router that can’t be sent back to the originating router.RIPv2 supports classless routing
- C.
  
  It prevents regular update messages from reinstating a route that has just come up
- D.
  
  It describes when a router sets the metric for a downed link to infinity
Correct Answer
D. It describes when a router sets the metric for a downed link to infinity

Explanation
Route poisoning is a mechanism used in routing protocols where a router sets the metric for a downed link to infinity. This means that the router considers the link as completely unreachable and prevents regular update messages from reinstating the route. By setting the metric to infinity, the router effectively "poisons" the route, ensuring that it is not used for forwarding packets. This helps to prevent routing loops and ensures efficient and accurate routing in the network.

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6.

Which statement is true regarding classless routing protocols?
- A.
  
  The use of discontinuous networks is not allowed
- B.
  
  The use of variable length subnet masks is permitted
- C.
  
  RIPv1 is a classless routing protocol
- D.
  
  RIPv2 supports classless routing
Correct Answer
B. The use of variable length subnet masks is permitted

Explanation
Classless routing protocols allow for the use of variable length subnet masks (VLSM). This means that the network can be divided into subnets of different sizes, allowing for more efficient use of IP addresses. With VLSM, networks can be subnetted into smaller subnets, which can then be further divided into even smaller subnets if needed. This flexibility allows for better utilization of IP address space and more efficient routing.

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7.

The DatagramSocket and DatagramPacket classes are not used for connection-less socket programming.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The statement is false because the DatagramSocket and DatagramPacket classes are indeed used for connection-less socket programming. These classes provide the functionality for sending and receiving datagrams, which are packets of data that can be sent over a network without establishing a connection beforehand. DatagramSocket is used to create a socket for sending and receiving datagrams, while DatagramPacket is used to encapsulate the data and address information of a datagram. Therefore, these classes are essential for connection-less socket programming.

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8.

Which methods are commonly used in ServerSocket class?
- A.
  
  Public OutputStream getOutputStream()
- B.
  
  Public Socket accept()
- C.
  
  Public synchronized void close()
- D.
  
  None of the above
Correct Answer
B. Public Socket accept()

Explanation
The correct answer is "public Socket accept()". This method is commonly used in the ServerSocket class to accept a connection from a client. It blocks until a client connects to the server and returns a Socket object that represents the client connection. This method allows the server to establish communication with the client and handle incoming requests.

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9.

Each packet is routed independently in ……………….
- A.
  
  Virtual circuit subnet
- B.
  
  Short circuit subnet
- C.
  
  Datagram subnet
- D.
  
  ATM subnet
Correct Answer
C. Datagram subnet

Explanation
In a datagram subnet, each packet is routed independently without any prior setup or connection establishment. This means that each packet is treated as a separate entity and can take different paths through the network. This approach allows for more flexibility and scalability as there is no need to establish and maintain a dedicated path for each packet. It also allows for better fault tolerance as packets can be rerouted in case of network failures.

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10.

Which address is meant for delivery of packet at Transport layer?
- A.
  
  IP address
- B.
  
  MAC Address
- C.
  
  Socket Adress
- D.
  
  Physical Address
Correct Answer
C. Socket Adress

Explanation
The correct answer is Socket Address. At the Transport layer, a socket address is used to identify the destination for the delivery of a packet. It consists of an IP address and a port number, which together specify the specific process or application running on a device that should receive the packet. The IP address alone only identifies the device, while the socket address provides the necessary information to deliver the packet to the correct process or application on that device.

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IT-a Lab Quiz Group 2

Which class is used to create servers that listen for either local client or remote client programs?

Which constructor of DatagramSocket class is used to creates a datagram socket and binds it with the given Port Number?

What is an example of a MAC address

If a datagram router goes down then …………..

What is route poisoning?

Which statement is true regarding classless routing protocols?

The DatagramSocket and DatagramPacket classes are not used for connection-less socket programming.

Which methods are commonly used in ServerSocket class?

Each packet is routed independently in ……………….

Which address is meant for delivery of packet at Transport layer?