Given below are two statements Statement I : Telnet, Ftp, Http are application layer protocol Statement II : The Iridium project was planned to launch 66 low orbit satellites. In light of the above statements, choose the correct answer from the options given below
Both Statement I and Statement II are true
Analyzing Network Protocols and Satellite Systems
This question asks us to evaluate two statements: one about common network protocols and their layer in the network model, and another about a specific satellite communication project called Iridium.
Evaluating Statement I: Application Layer Protocols
Statement I says: Telnet, Ftp, Http are application layer protocol.
Let's look at each protocol mentioned:
- Telnet (Telecommunication Network): This is a network protocol used to provide a command line based communication channel between two machines. It is primarily used for remote login. Telnet operates at the highest layer of the OSI model, which is the Application Layer.
- FTP (File Transfer Protocol): This protocol is standard network protocol used for the transfer of computer files from a server to a client on a computer network. FTP also operates at the Application Layer, facilitating user services.
- HTTP (Hypertext Transfer Protocol): This is the foundation of data communication for the World Wide Web. It's used to fetch resources such as HTML pages. HTTP operates at the Application Layer, enabling client-server communication for web resources.
Protocols at the Application Layer provide services directly to the end-user applications. Based on the function and standard classification of Telnet, FTP, and HTTP, they all indeed reside at the Application Layer of the TCP/IP model (which maps closely to the Application Layer of the OSI model for these protocols).
Therefore, Statement I is true.
Evaluating Statement II: The Iridium Project Satellites
Statement II says: The Iridium project was planned to launch 66 low orbit satellites.
The Iridium satellite constellation is a system of 66 active satellites used for worldwide voice and data communication. The system uses Low Earth Orbit (LEO) satellites. The original plan for the constellation was indeed to have 66 operational satellites, plus spare satellites in orbit and on the ground.
The number 66 is a key characteristic of the operational Iridium constellation size. The name 'Iridium' was chosen because the element Iridium has atomic number 77, reflecting an early design plan for 77 satellites. However, the final constellation design settled on 66 active satellites.
Therefore, Statement II is true.
Conclusion on Both Statements
Based on our analysis, both Statement I (regarding Telnet, FTP, HTTP as application layer protocols) and Statement II (regarding the Iridium project's 66 low orbit satellites) are factually correct.
Hence, the correct answer is that both statements are true.
Revision Table: Key Concepts
| Concept | Description | Relevance to Question |
|---|---|---|
| Application Layer | The highest layer in the TCP/IP or OSI model; provides network services directly to user applications. | Protocols Telnet, FTP, HTTP operate here (Statement I). |
| Telnet | Application protocol for remote command-line access. | Example of an Application Layer protocol (Statement I). |
| FTP | Application protocol for file transfer. | Example of an Application Layer protocol (Statement I). |
| HTTP | Application protocol for accessing web resources. | Example of an Application Layer protocol (Statement I). |
| Iridium Project | Satellite constellation for global mobile communications. | Known for its specific number of LEO satellites (Statement II). |
| Low Earth Orbit (LEO) | Orbits relatively close to Earth's surface (typically 160-2,000 km). | The type of orbit used by Iridium satellites (Statement II). |
| Number of Iridium Satellites | The operational constellation consists of 66 active satellites. | Key detail verified in Statement II. |
Additional Information: Network Layers and Satellite Constellations
Understanding network protocols often involves the concept of layered network models like the OSI model or the TCP/IP model. The Application Layer is where many user-facing network services reside.
- Other common Application Layer protocols include SMTP (email), DNS (domain name resolution), and SNMP (network management). Each serves a specific purpose for applications using the network.
- Satellite communication systems like Iridium use constellations of satellites to provide coverage over a wide area, often globally. LEO satellites are used because their proximity to Earth allows for lower latency and weaker signal requirements compared to geostationary satellites, though they require a larger number of satellites in a constellation to provide continuous coverage over a region.
- Besides Iridium, other satellite constellations exist for communication and navigation, such as GPS, GLONASS, Galileo, and newer broadband internet constellations like Starlink.
Important Questions from Computer Networks
______ lets users to show their location with websites they trust.
______ is a set of rules that governs how two computer system interact.
______ URL is used to send electronic mail.
GPRS _____ provides end to end packet switched data transfer service.
I. point to point
II. point to multipoint
Which of the following statements are true?
A. X.25 is connection‐oriented network
B. X.25 doesn’t support switched virtual circuits.
C. Frame relay service provides acknowledgements.
D. Frame relay service provides detection of transmission errors.
Choose the correct answer from the options given below :
