1.2. Communication and Internet technologies
A subsection of Computer Science, 9608, through 1. Theory Fundamentals
Listing 10 of 44 questions
Downloading a file from a website is an example of a client-server application. Describe what is meant by the term client-server for this application. The following sequence of steps (1 to 5) describes what happens when someone uses their personal computer (PC) to request a web page. The web page consists of HTML tags and text content only. Four of the statements from A, B, C, D, E and F are used to complete the sequence. A Browser software interprets the script, renders the page and displays. B Browser software renders the page and displays. C Browser software compiles the script, renders the page and displays. D The web server retrieves the page. E The Domain Name Service (DNS) uses the domain name from the browser to look up the IP address of the web server. F The web server sends the web page content to the browser. Write one of the letters A to F in the appropriate row to complete the sequence. 1. The user keys in the Uniform Resource Locator (URL) into the browser software. 2. 3. 4. 5. The following web page used for data capture consists of: • two text boxes for the entry of: ° a race runner’s ID code ° their finishing position in a race. • a button that the user clicks to submit this runner’s result. Untitled Document function myButton_onmousedown() { var Output1 = "Runner ID OK"; var Output2 = "ERROR – entry refused"; var Runner ID = document.forms["form1"]["txtRunnerID"].value; // || in Javascript is the 'OR' operator if (RunnerID.substr(0,3) == "VAR" || RunnerID.substr(0,3) == "CAM") { alert(Output1) } else { alert(Output2) } } Runner ID: Position: Save data: The developer has used three variables in the JavaScript code. State the identifiers used. 1. 2. 3. The button has an event whose identifier is onMouseDown. When the mouse button is clicked, some code is run. State the line numbers which contain this code. From line to line The JavaScript code uses a selection statement. State the line number which contains its condition. Line number: Describe the purpose of the validation check that the code performs. Name and describe two other types of validation check which could be appropriate for this data capture form. Validation check: Description Validation check: Description
9608_s17_qp_12
THEORY
2017
Paper 1, Variant 2
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A college has a client-server network. The college has a file server and other servers. State the purpose of two other servers in the college network. Server 1 Server 2 The students use the network to access the Internet. One student stated, ‘The Internet and the World Wide Web are the same thing’. Tick (✓) one box to indicate whether this statement is true or false. True False Justify your choice. Students use the college’s learning resource website. Several of the web pages include PHP script. Describe the sequence of events when a student requests a web page with embedded server-side code.
9608_s18_qp_11
THEORY
2018
Paper 1, Variant 1
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Computers on the Internet have IP addresses. IP addresses can be in either IPv4 or IPv6 format. Give an example of a valid IPv4 address. State why there is a need for IPv6 addressing. A computer’s IPv6 address is: C100:2235::1000:25AA:AA50 Explain why this IPv6 address would be an invalid IPv4 address. A company has computers in two separate buildings that communicate using the Internet over a Public Switched Telephone Network (PSTN). Describe the transmission of data using a PSTN. The company wants to install a dedicated line between the two buildings. Identify one benefit and one drawback of installing a dedicated line between the two buildings. Benefit Drawback A network can use routers and gateways. Explain the role of routers and gateways in a network. The company has an email server. Identify three other types of server.
9608_s19_qp_12
THEORY
2019
Paper 1, Variant 2
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Ana owns a small company with four employees. The office has a network containing several computers that run on a client-server model. There is one server that connects to the Internet using a router. Networks transmit data using various types of connection shown in the following table. Complete the table. Type of connection Description Fibre-optic A communication device in Earth’s orbit that receives and transmits data Radio waves Carries data as electrical signals and can consist of a twisted pair Explain how the client-server model enables the employees to access the same files from different computers. Each computer in the network has a private IP address. Give two reasons why the computers do not have public IP addresses.
9608_s20_qp_13
THEORY
2020
Paper 1, Variant 3
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A company operates a chemical plant, which has a number of processes. Local computers monitor these processes and collect data. The computers transfer these data to a central computer 50 km away. A telecommunications company provides cables. Engineers at the telco had to decide which type of cable to use. They considered the use of either copper cable or fibre optic cable. State two benefits of each type of cable. Each benefit must be clearly different. Benefits of copper cable Benefits of fibre optic cable
9608_w15_qp_11
THEORY
2015
Paper 1, Variant 1
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Describe what is meant by a client-server model of networked computers. Give two benefits of using the client-server model. The diagram shows a computer network with connection to the Internet. X client computer client computer file server mail server Internet Name the hardware device labelled X. A web page offers a link for users to request another web page. The requested web page contains HTML code and JavaScript code. Put each statement in the correct sequence by writing the numbers 1 to 5 in the right-hand column. Statement Sequence number The requested web page is displayed on the client computer The user clicks on the hyperlink and the web page is requested from the web server The requested web page content is transmitted to the client computer The client computer processes the JavaScript code using the web browser software The web server locates the requested web page
9608_w15_qp_11
THEORY
2015
Paper 1, Variant 1
View
A company operates a chemical plant, which has a number of processes. Local computers monitor these processes and collect data. The computers transfer these data to a central computer 50 km away. A telecommunications company provides cables. Engineers at the telco had to decide which type of cable to use. They considered the use of either copper cable or fibre optic cable. State two benefits of each type of cable. Each benefit must be clearly different. Benefits of copper cable Benefits of fibre optic cable
9608_w15_qp_13
THEORY
2015
Paper 1, Variant 3
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Describe what is meant by a client-server model of networked computers. Give two benefits of using the client-server model. The diagram shows a computer network with connection to the Internet. X client computer client computer file server mail server Internet Name the hardware device labelled X. A web page offers a link for users to request another web page. The requested web page contains HTML code and JavaScript code. Put each statement in the correct sequence by writing the numbers 1 to 5 in the right-hand column. Statement Sequence number The requested web page is displayed on the client computer The user clicks on the hyperlink and the web page is requested from the web server The requested web page content is transmitted to the client computer The client computer processes the JavaScript code using the web browser software The web server locates the requested web page
9608_w15_qp_13
THEORY
2015
Paper 1, Variant 3
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Customers of a bank can access their account information by logging in on the bank’s website. The bank has a client-server model of networked computers. Describe, using the bank as an example, the key features of a client-server model. Give two other examples of applications that can use the client-server model. The bank’s customers log in to the website using a web application. Explain why the web application uses server-side scripting. The bank is upgrading its local area network (LAN) copper cables to fibre-optic cables. State two benefits to the bank of upgrading to fibre-optic cable from copper cable. State two drawbacks of upgrading to fibre-optic cables. The bank uses a relational database, ACCOUNTS, to store the information about customers and their accounts. The database stores the customer’s first name, last name and date of birth. The bank has several different types of account. Each account type has a unique ID number, name (for example, regular or saving) and bonus (for example, $5.00, $10.00 or $15.00). A customer can have more than one account. Each customer’s account has its own ID number and stores the amount of money the customer has in that account. The bank creates a normalised, relational database to store the required information. There are three tables: • CUSTOMER • ACCOUNT_TYPE • CUSTOMER_ACCOUNT Write the attributes for each table to complete the database design for the bank. CUSTOMER( ) ACCOUNT_TYPE( ) CUSTOMER_ACCOUNT( ) Identify the primary key for each table that you designed in part . CUSTOMER ACCOUNT_TYPE CUSTOMER_ACCOUNT Identify one foreign key in one of the tables that you designed in part . Table name Foreign key The following table has definitions of database terms. Write the correct database term in the table for each definition. Definition Term All the data about one entity The data in one row of a table A column or field in a table
9608_w19_qp_11
THEORY
2019
Paper 1, Variant 1
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Questions Discovered
44