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OSI is popularly known as open system interconnection. It is all about networking framework that is used to implement protocols in different layers. All these layers collaboratively work to transfer the data from one person to other across the globe. If you are preparing for an interview to get the job check out OSI job interview questions and answers at wisdomjobs.com portal will be of great help. These OSI interview questions and answers framed with the expert knowledge, and it makes your path of getting the job in the domain hassle-free in the short interval. The job seeker will be able to answer the questions quite easily and become a preferred choice for the interviewer irrespective of the size of the company they choose to work.
Question 1. List The Layers Of Osi ?
Answer :
From top to bottom, OSI layers are, Application, Presentation, Session, Transport, Network, Data Link and Physical.
Question 2. What Are The Responsibilities Of Data Link Layer?
Answer :
Framing, Error detection, CRC and Physical Addressing is the task of DLL.
Question 3. What Are The Responsibilities Of Network Layer?
Answer :
Routing, IP Addressing and Path determination are the main responsibilities of Network Layer.
Question 4. What Are The Responsibilities Of Transport Layer?
Answer :
Transport Layer has a lot of function. Most important being,
Question 5. Routers Work At Which Osi Layer?
Answer :
Network Layer
Question 6. What Is A Window In Networking Terms?
Answer :
Window is the amount of segments sent between two acknowledgments by TCP.
Question 7. What Is The Role Of The Llc Sublayer In Data Link Layer?
Answer :
Logical Link Control provides error detection, using Ethernet trailer field frame check sequence (FCS).
Question 8. What Is The Function Of The Application Layer In Networking?
Answer :
Application Layer is responsible for providing a user interface in between user and Network with the help of applications like web browsers.
Question 9. What Are The Difference Between Tcp And Udp?
Answer :
Following are differences in TCP and UDP:
TCP stands for “Transmission Control Protocol”UDP stands for “User datagram Protocol”.
Question 10. What Is The Port No Of Dns And Telnet?
Answer :
DNS = 53, Telnet = 23
Question 11. Which Service Use Both Tcp And Udp ?
Answer :
DNS uses both TCP and UDP
Question 12. What Is The Port No Of Smtp And Pop3?
Answer :
POP3 = 110; SMTP = 25
Question 13. In Which Layer Term “frames” Is Used ?
Answer :
Frames are PDU of Data Link Layer
Question 14. In Which Layer Term “packets” Is Used ?
Answer :
Packets are PDU of Network Layer
Question 15. In Which Layer Term “segments” Is Used ?
Answer :
Segments are used at Transport Layer
Question 16. Give Some Example For Protocols Work At Application Layer ?
Answer :
Application Layer Protocols are HTTP, HTTPs, Telnet, SSH, DNS, FTP, TFTP, DHCP, RIP
Question 17. What Is Crc? Which Layer Crc Works ?
Answer :
Cyclic Redundancy Check is used to detect the errors in network. It works at Data Link Layer (LLC Sub Layer).
Question 18. What Is The Purpose Of The Data Link?
Answer :
Data Link Layer is responsible for Framing, Error Detection and Physical Addressing
Question 19. Which One Is Reliable – Tcp Or Udp ?
Answer :
TCP is reliable
Question 20. What Is The Port Number Of Ftp (data) And Ftp?
Answer :
FTP port number 20 (Data); 21 for Control
Question 21. Which Layer Provides Logical Addressing That Routers Will Use For Path Determination ?
Answer :
Network Layer
Answer :
Physical
Answer :
Data Link Layer
Answer :
Session
Question 25. Which Layer Segments And Resembles Data Into A Data Stream ?
Answer :
Transport
Answer :
Data Link Layer
Answer :
Network
Answer :
MAC works at DATA LINK LAYER. Media Access Control provides physical addressing while Logical Link Control provides error detection, using Ethernet trailer field frame check sequence (FCS). It is 4 bytes field. When a sending device sends a data it put the data in a mathematical algorithm and it gets a product, sending device puts the product in FCS. When a receiving device receive a data it also put the data in same mathematical algorithm and get a product. If both products are same, Frame is accepted or else discarded.
Answer :
Physical Layer
Answer :
Network Layer
Answer :
Presentation Layer
Answer :
Session Layer
Question 33. Dns Uses Which Protocol? Why?
Answer :
DNS uses both TCP and UDP
Question 34. Which Layer Is Closer To The User?
Answer :
From sender point of view, Application Layer is closest and from Receiver point of view Pgysical Layer is closest.
Question 35. Differentiate Between Forward Lookup And Reverse Lookup In Dns?
Answer :
Forward Lookup: Name to IP resolution
Reverse Lookup: IP to Name resolution;
Answer :
IPSec provides data security at the IP Packet Level.
Question 37. What Is The Way To Establish A Tcp Connection?
Answer :
TCP Connection is established using three-way Handshake.
Question 38. What Is The Difference Between Flow Control And Error Control?
Answer :
Error Controls the process of detecting and correcting bot the bit and packet level error. While flow control is a mechanism to ensure the efficient delivery of Data. Flow control is agreeing on the minimum amount of data that a receiver can handle at a time.
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