Deck 23: Internet Networkingetext Only

Question 1

Two kinds of data are transmitted between computers: ______________ refers to the data that one computer actually wants to send to another.Network protocol data are the data that describe how to reach the intended recipient and how to check for errors and data loss in the transmission.
A.packets
B.transmission data
C.application data
D.socket data

Answer 1

application data

Question 2

The ____________ has one function, to attempt to deliver data from one computer to another across the Internet.
A.TCP/IP
B.IP
C.HTTP
D.DNS

Answer 2

IP

Question 3

__________________ is the protocol that defines communication between Web browsers and Web servers.
A.TCP/IP
B.Telnet
C.HTTP
D.IP

Answer 3

HTTP

Question 4

_______ ________ was developed to enable

Question 5

If your data gets lost or garbled during transmission from one computer to another, what is responsible for ensuring that the recipient is aware of the unfortunate fact and does not rely on incomplete data?
A.TCP
B.IP
C.HTTP
D.DNS

Question 6

The ____ is a complex collection of pathways on which a message can travel from one access point to another.
A.IP
B.HTTP protocol
C.HTML
D.Internet

Question 7

In a communication protocol, can the sender indicate how many bytes are contained in the request?
A.Yes, the web server does that at the end of the GET request.
B.Yes, the web browser does that in POST request.
C.Yes, the web browser does that at the end of the HTTP header.
D.No, the sender can't indicate how many bytes are contained in the request.

Question 8

The term _____________ data refers to the data that describe how to reach the intended recipient and how to check for errors and data loss in the transmission.
A.packet
B.socket
C.application data
D.network protocol

Question 9

IP breaks up large chunks of data into more manageable ____________________.
A.packets
B.sockets
C.application data
D.network protocol data

Question 10

If a computer wants to request information from gateway.com, it must first ask a(n) ____ server to translate the domain name into a numeric Internet address.
A.DNS
B.socket
C.URL
D.IP

Question 11

Which of the following is false about packets?
A.They're one of the products of the IP which makes sending and receiving data more manageable
B.They're numbered and the recipient reassembles them in the correct order
C.Each packet is delivered separately
D.Different packets that are part of the same transmission must take the same routes through the internet

Question 12

____ has built-in provisions for retrying incomplete transmissions.
A.TCP
B.IP
C.DNS
D.HTTP

Question 13

____________________ has no provision for retrying an incomplete transmission.
A.TCP
B.IP
C.FTP
D.HTTP

Question 14

What service translates an IP address to a name that is easier to remember?
A.Domain Name System
B.Transmission Control Protocol
C.Distinct Name Signifier
D.Uniform Resource Locator

Question 15

_____________ attempts reliable delivery of data, with retries if there are failures.It also notifies the sender whether or not the attempt succeeded.
A.IP
B.FTP
C.HTTP
D.TCP

Question 16

What does the acronym POP stand for?
A.Point to Point
B.Post Office Point
C.Protocol Of Point
D.Post Office Protocol

Question 17

The first time you open a certain webpage, it takes a few seconds to load.Later in the day, you open the same webpage again and it was much quicker.What made this

Question 18

The ____________ translates domain names into Internet addresses.
A.DSN
B.DNIP
C.DNS
D.TCP

Question 19

What are among the most important pieces of information that must be included in an IP packet?
I) The Internet address of the recipient
II) The URL of the recipient
III) The Internet address of the sender
IV) The port number of the sender
A.Only I, III, and IV
B.Only I, II, and III
C.Only II, III, and IV
D.I, II, III, and IV

Question 20

Each IP ____ is delivered separately, and each one that is a part of the same transmission can take

Question 21

Which of the following statements is correct?
A.HTML is a protocol that describes the command set for web server requests.
B.Web servers know how to display HTML documents.
C.Web servers know how to issue HTTP commands.
D.The Telnet program is not a browser and does not understand HTML tags.

Question 22

The HTTP command DELETE ____________.
A.deletes two items, an item on the server and an item from the client.
B.deletes an item from the client.
C.deletes an item on the server.
D.deletes input from a client-side command.

Question 23

The ____ program is a useful tool for establishing test connections with servers.
A.DNS
B.HTML
C.Telnet
D.TCP

Question 24

What does the acronym SMTP stand for?
A.Simple Mail Transfer Protocol
B.Small Mail Transport Protocol
C.Simple Mail Transport Protocol
D.Small Mail Transfer Protocol

Question 25

The HTTP command OPTIONS ____________.
A.requests the item's communication options.
B.returns the item's options from the client.
C.returns the item's option on the server.
D.changes the options of the item.

Question 26

Write a code fragment that connects to a server running on gorge.divms.uiowa.edu at port 2345 and reads one line of text sent by the server.

Question 27

The HTTP command POST ____________.
A.returns the requested item.
B.supplies input to a server-side command and returns the result.
C.requests input from the server-side command.
D.supplies input to a client-side command.

Question 28

To connect to the HTTP port (80) of the server yahoo.com, you use:
A.Socket s = new Socket(80, yahoo.com);
B.Socket s = connect("yahoo.com", 80);
C.Socket s = new Socket("yahoo.com", 80);
D.java yahoo.com 80

Question 29

Which type of protocol defines communication between the web browsers and web servers?
A.World Wide Web
B.Hypertext Transfer Protocol
C.Transmission Control Protocol
D.Internet Protocol

Question 30

Which of the following HTTP commands supplies input to a server-side command and returns the result?
A.CONNECT
B.DELETE
C.HEAD
D.POST

Question 31

Which of the following protocols is used to send email messages?
A.POP
B.IP
C.SMTP
D.TCP

Question 32

A(n) ____ is a pointer to an information resource on the World Wide Web.
A.URL
B.socket
C.IP address
D.domain name

Question 33

The HTTP command GET ____________.
A.returns the requested item.
B.supplies input to a server-side command.
C.requests input from the server-side command.
D.supplies input to a client-side command.

Question 34

A ______ is an object that encapsulates a TCP connection.
A.packet
B.socket
C.client
D.server

Question 35

Suppose that sock refers to a TCP socket connected to another machine, and in is aScanner.Which code sends the string "Who is there?" to the other machine, receives the return answer, and then prints it?

Question 36

Which of the following is not an HTTP command?
A.HEAD
B.BODY
C.PUT
D.OPTIONS

Question 37

The HTTP command TRACE ____________.
A.traces the requested item.
B.traces an item from the client.
C.traces an item on the server.
D.traces the server communication.

Question 38

Which of the following is true about web servers?
A.Servers know how to display HTML documents
B.Servers know nothing about HTML
C.Servers know how to issue HTTP commands
D.Servers describes the structure of a document

Question 39

The HTTP command HEAD ____________.
A.stores the header information of an item on the server.
B.deletes the header information of an item from the server.
C.requests the header information of an item.
D.traces the header information of an item.

Question 40

The HTTP command PUT ____________.
A.returns the requested item.
B.stores an item on the client.
C.stores an item on the server.
D.supplies input to a client-side command.

Question 41

Sending commands over a socket connection is ___________.
A.a high-level approach.
B.a Medium-level approach.
C.a low-level approach.
D.a complex approach.

Question 42

Suppose you use the URLGet program in Section 23.5 to get a web page that does not exist on a server (which does exist).Assuming that the server is otherwise working properly, what will happen?
A.The call to openConnection will throw an exception.
B.The call to getResponseCode will return the error code 404.
C.The call to getResponseMessage will return null.
D.The call to getInputStream will throw an exception.

Question 43

What are the steps involved in designing a client/server application?
I) Design a communication protocol.
II) Test the server with the Telnet program.
III) Implement the server program.
IV) Write a client program.
A.Only I
B.Only I and II
C.Only I, II, and III
D.I, II, III, and IV

Question 44

To kill a server that was started in a shell window, ________.
A.press Ctrl+C
B.press Ctrl+Z
C.call the kill method
D.servers don't stop.

Question 45

Which of the following is true about sockets?
A.Sockets are needed in order to communicate with a web server
B.When data is sent to outstream, the socket automatically forwards it to the server
C.The socket closes when transmission over the socket is complete
D.Sockets that are part of the same transmission can take

Question 46

To retrieve the response code from a URLConnection object, you need __________________.
A.to cast the HttpURLConnection object to the URLConnect subclass.
B.to cast the URLConnection object to the HttpURLConnect subclass.
C.to use the getInputStream() method.
D.to use the getCodeResponse() method.

Question 47

The ______ method of the ServerSocket class waits for a client connection.
A.wait()
B.connect()
C.accept()
D.next()

Question 48

A print writer buffers the characters that you send to it.To make sure that the server gets a complete request at a time, you need to ________ the buffer.
A.print
B.send
C.scan
D.flush

Question 49

The Java library provides a _________ class that can take care of the socket connection to a web server.
A.SocketConnection
B.ServerConnection
C.ClientConnection
D.URLConnection

Question 50

Which code creates a server socket on port PORT_NUMBER and listens for a connection?

Question 51

The ______ method empties the buffer and forwards all waiting characters to the destination.
A.print
B.send
C.scan
D.flush

Question 52

Buffering the characters means:
A.characters are immediately sent to their destination.
B.characters are not placed in an array.
C.characters are not immediately sent to their destination.
D.characters are being flushed.

Question 53

Which code fragment creates a server running at port 6666 and sends one line of text, "Hello from earth" over and over to any machine that connects to the server?

Question 54

For the server to execute the run method in a separate thread for each client, the application program needs to implement the _____ interface.
A.Running
B.Runtime
C.Server
D.Runnable

Question 55

The following command:
java pgmName hostname /
lets you retrieve any item from a web server.The slash means:
A.the port of the hostname.
B.the root page of the web server.
C.the character to end the command.
D.the item name needs to be retrieved.

Question 56

For test protocols, turn the socket streams into:
A.scanners and readers.
B.scanners and printers.
C.scanners and writers.
D.scanners and servers.

Question 57

_________ objects are used for communication (IO) between two computers (client and server).
A.ServerSocket
B.Socket
C.ClientSocket
D.Packet

Question 58

The _________ class makes it easy to fetch a file from a web server.
A.FileConnection
B.ServerConnection
C.ClientConnection
D.URLConnection

Question 59

Which HTTP command supplies input to a server-side command and return the result?
A.Get
B.Options
C.Put
D.Post

Question 60

A thread dies ______________
A.when the client quits or disconnects.
B.when the run method exits.
C.when the client quits or disconnects and/or when the run method exits.
D.the thread runs forever in the background.

Question 61

To retrieve the response code and message from an HttpURLConnection object, you need __________________.
A.to use the getInputStream() method.
B.to use the getURLConnection() method.
C.to use the getResponseCode() and getResponseMessage() methods.
D.to use the getCodeResponse() method.

Question 62

To close a connection, which of the following statements can you use?

Question 63

What does TCP/IP stand for?
A.Transmission Control and Internet Protocol.
B.Transmission Control Protocol and Internet Protocol.
C.Transmission Protocol and Internet Protocol.
D.Transmission Control Protocol over Internet Protocol.

Question 64

A successful response has status code _______________.
A.200 OK.
B.404 OK.
C.0 OK.
D.100 OK.

Question 65

What does the following if statement do?
if (code == HttpURLConnetion.HTTP_OK)
A.It checks if the code is 200.
B.It checks if the code is 404.
C.It checks if the connection is still connected.
D.It checks if there is HTTP.

Question 66

When you communicate with a mail server, you ___________, or you can learn how to use Java mail extensions.
A.can write programs that send GET and POP commands.
B.can write programs that send SMTP and POST commands.
C.can write programs that send GET and POST commands
D.can write programs that send SMTP and POP commands.

Question 67

A page not found has status code _______________.
A.200 not found.
B.404 not found.
C.0 not found.
D.100 not found.

Question 68

Suppose you use the URLGet program in Section 23.5 to get a web page from a server that does not exist, such as http://wombat.java/index.html.What will happen?
A.The call to the URL constructor will throw an exception.
B.The call to getResponseCode will throw an exception.
C.The call to getResponseCode will return the error code 404.
D.The call to getInputStream will throw an exception.

Question 69

The HTTP response code 200 means _______________.
A.the response is successful.
B.the page is found successfully.
C.the page was not found.
D.the connection is lost.

Question 70

The HTTP response code 404 means _______________.
A.the response is successful.
B.the page is found successfully.
C.the page was not found.
D.the connection is lost.

Question 71

You should use a ______ to connect to a web server.
A.Packet
B.Socket
C.URLConnection
D.HttpURLConnection

Question 72

When you communicate with a web server to obtain data, you have two choices:
I) You can make a socket connection and send GET and POST commands.
II) You can make a server connection and send GET and POST commands.
III) You can use the URLConnection class and have it issue the commands on your behalf.
IV) You can use the URL class and have it issue the commands on your behalf.
A.I and II
B.II and III
C.III and I
D.IV and II

Question 73

What would the getResponseCode return if the response was successful?
A.101
B.404
C.200
D.201

Question 74

To open a connection, which of the following statements can you use?