1.2. Communication and Internet technologies
A subsection of Computer Science, 9608, through 1. Theory Fundamentals
Listing 10 of 44 questions
Joshua’s laptop is connected to the router on his home network. The laptop has a private IP address. The router has both public and private IP addresses. Explain the reasons why Joshua’s laptop has a private IP address only, but the router has both a private and a public IP address. Joshua visits a website by entering its Uniform Resource Locator (URL). Describe how the URL is converted into a matching IP address. Give one example of a valid IPv4 address.
9608_w20_qp_11
THEORY
2020
Paper 1, Variant 1
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A web server has a public IPv4 address. Draw lines to link each characteristic to its appropriate IP address. Can use hexadecimal notation Characteristic IP address Each group of digits is a number between 0 and 65535 IPv4 IPv6 Consists of four groups of digits Uses double colons (::) The total length of the address is 32 bits IP addresses can be static or dynamic. Explain the reasons for the web server using a static instead of a dynamic IP address.
9608_w20_qp_12
THEORY
2020
Paper 1, Variant 2
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A customer completes a booking form on a web page and clicks a submit button to submit the form. The following sequence (1 to 6) describes the steps that take place when the form is submitted. The form data is transmitted to the web server The HTML code is returned to the browser Write one of the letters A to D in each row (1, 3, 4 and 6) to complete the sequence. A The browser displays the web page B Server-side code is processed C Client-side code is processed D The web server produces the HTML code The web page 9608.html is accessed from the URL: https://www.cambridgeinternational.org/9608.html An employee of the company states, “A Domain Name and an IP address are exactly the same thing”. State whether this statement is true or false and justify your choice.
9608_s21_qp_13
THEORY
2021
Paper 1, Variant 3
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The design of a web-based application can require the use of client-side scripting. Describe what is meant by client-side scripting. A user requests a web page by keying the Uniform Resource Locator (URL) into the address bar of their web browser. The requested page contains a client-side script. Describe the sequence of steps leading to the display of the web page on the computer screen. A web page used for data capture consists of: • two text boxes for the entry of: • a product code • the number of items to be purchased. • a button which is clicked when the user wants to submit this order. Study the following web page. Untitled Document function myButton_onmousedown() { var Message1 = "ERROR – Order refused"; var Message2 = "Product code OK"; var x = document.forms["form1"]["txtProductCode"].value; if (x == "") { alert(Message1) } else { alert(Message2) } } Product code: Number: Submit order: The developer has used three variables in the JavaScript code. State the identifiers used. The button has an event whose identifier is onMouseDown. When the submit button is clicked, some code is executed. State the line numbers that contain this code. From line to line The JavaScript code uses a selection statement. State the line number that contains the condition. Line number: Describe the purpose of the validation check that the code performs. Name and describe two other types of validation check that could be appropriate for this data capture form. Validation check: Description Validation check: Description
9608_s17_qp_11
THEORY
2017
Paper 1, Variant 1
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The design of a web-based application can require the use of client-side scripting. Describe what is meant by client-side scripting. A user requests a web page by keying the Uniform Resource Locator (URL) into the address bar of their web browser. The requested page contains a client-side script. Describe the sequence of steps leading to the display of the web page on the computer screen. A web page used for data capture consists of: • two text boxes for the entry of: • a product code • the number of items to be purchased. • a button which is clicked when the user wants to submit this order. Study the following web page. Untitled Document function myButton_onmousedown() { var Message1 = "ERROR – Order refused"; var Message2 = "Product code OK"; var x = document.forms["form1"]["txtProductCode"].value; if (x == "") { alert(Message1) } else { alert(Message2) } } Product code: Number: Submit order: The developer has used three variables in the JavaScript code. State the identifiers used. The button has an event whose identifier is onMouseDown. When the submit button is clicked, some code is executed. State the line numbers that contain this code. From line to line The JavaScript code uses a selection statement. State the line number that contains the condition. Line number: Describe the purpose of the validation check that the code performs. Name and describe two other types of validation check that could be appropriate for this data capture form. Validation check: Description Validation check: Description
9608_s17_qp_13
THEORY
2017
Paper 1, Variant 3
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A company allows customers to stream music from its servers over the Internet. The company’s internet connection is currently provided through copper cables. Identify two pieces of hardware, other than the cables, that enable the servers to connect to the Internet. Describe the purpose of each device. Device 1 Purpose Device 2 Purpose The company wants to upgrade their internet connection to fibre‑optic cables. Give one benefit and one drawback to the company of upgrading to fibre‑optic cables. Benefit Drawback A customer enters a song title into a web page to listen to the song. The design of the web page is shown: Company Name Navigation Bar Enter song title: Search The web page will make use of both client‑side and server‑side scripting. Explain how client‑side scripting will be used in this web page. Explain how server‑side scripting will be used after the customer clicks the ‘Search’ button. The company needs to keep the data on its servers secure from online threats. Describe how a firewall will help to protect the data on the servers from online threats. Give one additional security measure that the company can use to protect the data on the servers from online threats.
9608_s20_qp_12
THEORY
2020
Paper 1, Variant 2
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A web page includes HTML and JavaScript code. 04 Calculate area of a triangle: 06 Base 07 Height 08 Calculate 12 function area() { 13 var base = document.forms["Triangle"]["B"].value; 14 var height = document.forms["Triangle"]["H"].value; 15 if (base == "" || height == "") { 16 alert("Both values must be entered"); 17 return false; 18 } 19 else { 20 area = 0.5 * height * base; 21 alert("The area is: " + area); 22 } 23 } Give the three identifiers used in the JavaScript code. State the purpose of the code on line 08. The page is loaded and the values 2 and 8 are entered. State the output when the calculate button is clicked. State the meaning of the || operator in line 15 of the code. Data validation has been used in line 15 of the JavaScript code. Identify the type of data validation used in line 15. Identify two other data validation checks that could be used. Question 5 continues on the next page. Cambridge International Holidays allows customers to make holiday bookings on its website. Bochen visits the Cambridge International Holidays website to book a holiday. The sequence (1 to 8) below describes the steps that take place when he submits a booking. Four of the statements A, B, C, D, E and F are used to complete the sequence. A Any errors found at the server side are flagged, and step 1 is repeated. B HTML code is used on the client’s web browser to validate the form data. C PHP code is executed to generate a confirmation (HTML) web page that is returned to the client’s web browser. D The form data is transmitted to Cambridge International Holidays’ web server. E JavaScript code is executed to generate a confirmation (HTML) web page that is returned to the client’s web browser. F JavaScript code is executed on the client’s web browser to validate the form data. Write one of the letters (A, B, C, D, E or F) in the appropriate row to complete the sequence. Bochen completes the online booking and clicks ‘Submit’. Any errors found are flagged, and step 1 is repeated. PHP code is executed to perform extra data validation checks on the form data. The booking details are added to the database.
9608_s21_qp_12
THEORY
2021
Paper 1, Variant 2
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A web page includes the following PHP and HTML code. 08 Enter Age: 12 30) $message = "You are too old"; else $message = "Allowed"; return $message; } 20 ?> Name two identifiers used in the PHP code. Write the value assigned to $message if the user types 30 in the text box. Explain the purpose of the code in line 18. The PHP code in a web page uses server-side scripting. List the sequence of events that take place when a user requests a web page containing PHP code.
9608_w18_qp_11
THEORY
2018
Paper 1, Variant 1
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Server-side scripting is used to access a company database over the Internet. Steps 1 to 6 describe the sequence of events. Four of the statements A, B, C, D, E and F are used to complete the sequence. Letter Statement A The web server processes the PHP code. B The server renders the HTML code and displays the web page. C The browser renders the HTML code and displays the web page. D The web server returns the (HTML) web page to the client web browser. E The web server accesses the page from its hard disk. F The web browser processes the PHP code. Write one of the letters A to F in each appropriate row to complete the sequence. 1. The browser requests the web page from the web server. 2. 3. 4. The web server produces the HTML code for the web page. 5. 6.
9608_w21_qp_11
THEORY
2021
Paper 1, Variant 1
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Questions Discovered
44