FAQ-OSI v/s TCP/IP# INTERVIEW PREP GUIDE ABOUT OSI v/s TCP/IP
'Practical term used in professional training'
🔹 What is the function of the Physical layer ?
transmits raw bits over a physical medium.
🔹 What is the role of the Data Link layer ?
Provides MAC addressing and error detection.
🔹 What does the Network layer do ?
Handles logical addressing and routing (IP's)
🔹 What is the purpose of the Transport layer ?
Ensures reliable data transfer (TCP/UDP). Mean that Host-to-host Communication
🔹 What does the Session layer do ?
Manages sessions between applications.
🔹 What is the Presentation layer responsible for ?
Encryption, compression and data formatting.
🔹 What does the Application layer do ?
Provides services to end-user applications (HTTP, FTP).
🔹Why is OSI important ?
It helps in understanding and troubleshooting networks. In otherword, Could be communicate with different brand.
🔹 What is encapsulation in OSI ?
Process of adding headers at each layer.
🔹 What is PDU in OSI ?
Protocol Data Unit (Data, Segment, Packet, Frame, Bits).
🔹 What is TCP/IP Model ?
A practical networking model used on the Internet.
🔹 How many layers are in TCP/IP and who deployed ?
4 Layer and Developed by DARPA (Defense Advanced Research Projects Agency).
🔹 What is the Internet layer responsible for ?
Logical addressing and routing (IP).
🔹 Which protocols work at Transport layer ?
TCP and UDP.
🔹 What protocols work at Application layer ?
HTTP, HTTPS, FTP, SMTP, DNS.
🔹 Is TCP/IP used on the Internet ?
Yes, it is the foundation of the Internet.
🔹 Why is TCP/IP widely adopted ?
Because it was implemented before OSI.
🔹 How to describe the both model ?
OSI model is conceptual and TCP/IP model is practical.
🔹 Is OSI protocol-dependent ?
No, it is protocol-independent.
🔹 Is TCP/IP protocol-dependent ?
Yes, based on specific protocols.
🔹 Which model is better for troubleshooting ?
OSI (because of detailed layers).
🔹 Which model is used in real networking devices ?
TCP/IP.
🔹 Does OSI define specific protocols ?
No.
🔹 Does TCP/IP define protocols ?
Yes, (IP, TCP, UDP).
🔹 Why do we study OSI if TCP/IP is used ?
Because OSI helps understand networking concepts clearly.
