Question
A network administrator is troubleshooting a problem
where a web application is not reachable. After confirming that the physical connections are intact, the administrator pings the application server successfully, but the HTTP service is still unavailable. At which OSI layer is the problem most likely located?Solution
The problem is most likely at the Application Layer, as the HTTP service (port 80 or 443) is associated with this layer. The successful ping indicates that the lower layers (Physical, Data Link, Network, and Transport) are functioning correctly. The ping verifies connectivity at the Network Layer, and the presence of the transport connection (TCP/UDP) implies no issues at the Transport Layer. 1. The Application Layer ensures protocols like HTTP, SMTP, and FTP are operational. 2. A failure at this layer suggests a misconfiguration or malfunction in the web server software or application itself. 3. This problem could include incorrect server configurations, missing HTTP services, or software bugs affecting application-level communication. Why Other Options Are Incorrect: • A) Physical Layer: A failure at this layer would result in no network connectivity, and ping would fail. • B) Data Link Layer: Responsible for node-to-node data transfer. Ping success indicates no issues here. • C) Network Layer: Handles IP addressing and routing. Successful ping confirms this layer is functional. • D) Transport Layer: Ensures data delivery. Issues here would prevent ping replies, which is not the case.
799.99 + 1500.12 Ă· 29.98 Ă— 50.01 = ? Ă— 24.96
- The profit of a business increased by Rs. 300. If the old profit was 30% less than the new profit, then the old profit was:
The combined income of 'Sam' and 'Neil' is Rs. 120,000. If Sam's income were Rs. 35,000 more, it would be 50% more than Neil's original income. Both Sam...
The income of 'Q' surpasses that of 'S' by a suffering 4000%. The expenses of 'Q' and 'S' are in a ratio of 125:12. 'Q' has savings that exceed those of...
Ravi earns 25% more than Rohit, and Rohit spends 75% of what Ravi spends. The ratio of Rohit's savings to Ravi’s savings is 5:7. If Rohit’s expendit...
The monthly incomes of Arjun, Rohan, and Sameer are in the ratio of 7:9:8, while their monthly expenditures are in the ratio of 3:4:5. Arjun earns Rs. 2...
- A allocates his monthly income as follows: 15% for rent, 25% for groceries, and 20% for bills, while saving the remaining amount. If his savings amount to ...
In the last financial year the ratio of the monthly incomes of Viraj and Rohan was m : n and the ratio of their monthly expenditures was p : n. In the c...
Vignesh spends 42% of his monthly salary on food, 16% on house rent, 11% on entertainment and 7% on conveyance. But due to some family function, he has...
The total monthly salary of Mamta and Rishi is Rs 1,10,000 and the ratio of the expenses of Mamta and Rishi is 7:6 and the ratio of savings of Rishi and...
