The same student is curious about how a Web site appears on his computer screen. On a separate piece of paper, draw and explain
the communication between a client and a server when the client requests a Web page; use the OSI model as a reference. For example, what Application layer protocol is required?How will the process differ if the student is sending or retrieving information to or from a secure Web site?
1 answer:
Answer:
HTTP is the application layer protocol required.
Explanation:
For a web page to be displayed on a browser, the seven layers of the OSI model work together. On the application layer, HTTP protocol is used to communicate between the server and the client. The HTTP client is the browser (Chrome, Internet Explorer, Firefox etc.) which sends a request to the HTTP server for accessing a web page.
When a URL is accessed, the HTTP client sends a request to the HTTP server. The server locates the file which is being requested and sends a response message containing the web page which is to be displayed. The exchange of data between the HTTP client and server takes place over a TCP connection.
TCP is a transport layer protocol which provides a reliable connection over which the exchange of data takes place. Data at the transport layer is sent in the form of segments. If the data being sent from the server is too long, it is divided into multiple segments and sent one after the other. The client is then responsible for joining the segments and displaying the information as a web page. The transport layer is also responsible for error correction and detection during the communication process.
If the student is sending or retrieving information from a secure website, the messages being exchanged between the client and server will be encrypted. This means that if a third-party tries to tap the communication process, they would not be able to decipher the messages. This increases the security and helps keep the information present on the web page confidential.
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Answer:
Explanation:
12 seconds to try one combination will be equivalent to
Password contain at least 8 digit i.e. password can contain 8, 9, 10 digit.
Password cannot contain more than 10 digit because it will give room for repetition which it is clearly stated that digit cannot be repeated.
Possible digit that can be used: 9,8,7,6,5,4,3,2,1,0.
Total number of passwords combination possible for each position in 8 digit.
1st position = 10, 2nd position = 9, 3rd position = 8, 4th position = 7, 5th position = 6, 6th position = 5, 7th position = 4, 8th position = 3. Total number of passwords combination possible in 8 digit is equivalent to .
Total number of passwords combination possible for each position in 9 digit.
1st position = 10, 2nd position = 9, 3rd position = 8, 4th position = 7, 5th position = 6, 6th position = 5, 7th position = 4, 8th position = 3, 9th position = 2. Total number of passwords combination possible in 9 digit is equivalent to .
Total number of passwords combination possible for each position in 10 digit.
1st position = 10, 2nd position = 9, 3rd position = 8, 4th position = 7, 5th position = 6, 6th position = 5, 7th position = 4, 8th position = 3, 9th position = 2, 10th position = 1. Total number of passwords combination possible in 10 digit is equivalent to 10!.
Adding them up and multiplying by to get the total number of time needed to guarantee access to database =