Computer Networks — Test 21

Correct Answer: A. A. True
Explanation: The URL Connection class can be used to read and write data to the specified resource referred by the URL. A connection to the URL is initialized by the OpenConnection() method of the class.

Correct Answer: A. A. True
Explanation: Datagram is basically some information travelling between the sender and the receiver, but there is no guarantee of its content, arrival or arrival time. A Datagram socket class object is created to make a datagram connection between the server and the client.

Correct Answer: C. C. Protocol
Explanation: TCP, FTP, Telnet, SMTP, POP etc. are examples of Protocol. Out of them, TCP is a transport layer protocol and FTP, TELNET, SMTP and POP are application layer protocols.

Correct Answer: B. B. Ip address
Explanation: The java.net.InetAddress class represents IP Address of a particular specified host. It can be used to resolve the host name from the IP address or the IP address from the host name.

Correct Answer: A. A. True
Explanation: The flush () method of Print Stream class flushes any un cleared buffers in memory.

Correct Answer: C. C. Both datagram socket & datagram packet
Explanation: Datagram is basically some information travelling between the sender and the receiver, but there is no guarantee of its content, arrival or arrival time. Datagram Socket, Datagram Packet are used for connection-less socket programming, while Server Socket is used for connection-oriented socket programming.

Correct Answer: A. A. Public string get hostname()
Explanation: In Inet Address class public String getHostname() method returns the host name of the IP Address. The getHostAddress() method returns the IP address of the given host name.

Correct Answer: C. C. Forwarding
Explanation: Forwarding is done by the nodes in the path from source to destination, that are not the intended destination for the packet in order to pass the packet to the next node in the path. The destination machine does not forward the packet to any other node.

Correct Answer: A. A. Network-specific method
Explanation: In the network specific forwarding method, there is only one record, the destination of the packet, in the routing table and not the other hosts of the network. The other two forwarding methods are the default method and the next-hop method.

Correct Answer: C. C. Routing table
Explanation: In the next-hop forwarding method, the routing table of each router in the path contains the address of only the next hop in the path of packet. This method is suitable for short distances only.