The Open Systems Interconnection (OSI) model is a conceptual 7-layer framework developed by the ISO to standardize networking functions, allowing diverse systems to communicate. It maps the flow of data from software applications down to physical hardware, aiding in troubleshooting, security, and interoperability.
A | Layer | Protocols / Data | Data Unit | Functions | Hardware / Examples |
A | Application | HTTP, HTTPS, FTP, TELNET, SMTP, DNS | Message | Provides services to end-users, interface for apps | Browsers (Chrome/Firefox), Email clients, Servers |
P | Presentation | JPEG, PNG, GIF, MOV, SSL/TLS | Message | Data translation, encryption/decryption, compression | Handled by software, libraries (e.g., OpenSSL) |
S | Session | RPC, NetBIOS, APIs | Message | Session establishment, management, termination, authentication | Software (API managers, session controllers) |
T | Transport | TCP, UDP | Segment +Port.Num +DataUnit) | Flow control, error detection/correction, sequencing, port addressing | Firewalls (stateful), load balancers |
N | Network | IP, ICMP | Packet (Frame+IP) | Logical addressing, routing, packet forwarding | Routers, Layer 3 switches |
D | Data Link | Ethernet, PPP, ARP | Frame (Bit+MAC) | Physical addressing (MAC), error detection, frame delimiting | Switches, bridges, NICs |
P | Physical | Ethernet, DSL, USB | Bit | Transmission of raw bits over medium | Cables, hubs, repeaters, NICs |
- The physical, datalink, and network support layers and the user support layer.
- the physical layer coordinates the function required to transmit a bit stream over a physical medium.
- The data link layer is responsible for delivering data units from one station to next without errors.
- The network layer is responsible for the source to destination delivery of a packet across multiple network links.
- The rransport layer is responsible for the process to process delivery of the entire message.
- The application layer enables the user to access the network.
- Transmission media lie below the physical layer.
- First layer of OSI reference model is ...Physical Layer....
- X.21 is a ..Physical and Datalink layer protocol...
- Interoperability is the function of ...Presentation Layer....
- Which one of the following uses the greaters number of layer in the OSI? ...Gateway...
- Application layer in TCP/IP model correspond to ..Layer 6 and 7 in OSI Model..
- Which layer is responsible for data translating? Presentation Layer.
- In the following List of device which device is used in network layer?Router
- End to end connectivity is provided form host to host in ..Transport Layer..
- In OSI model, which of the following layers transform information from machine format into that understandable of user? ..Presentation Layer..
- Which layer of OSI determines the interface of the system with the users? ...Application Layer..
- The ..Session Layer..decides the location of synchronization points.
- The end to end delivery of the entire message is the reponsibilty of the ..Transport Layer...
- The ..Physical Layer.. is the layer closest to the transmission medium.
- In the ...Data Link Layer.., the data unit is called frame.
- TCP/IP model doesnt have ..Session Layer.. but OSI model have this layer.
- Decryption and encryption of data are the responsibilty of the ...Presentation Layer...
- Dialog control is the function of ..Session Layer...
- Mail service and directory services are available to network users throught the .. Application layer..
- Node-to node delivery of the data unit is the responsibilty of the .Data link Layer..
- In OSI reference model, which layer is responsible for error-free, end to end (process-to-process ) delivery of data from source host to destination host?Transport layer
- Which layer provides the service to user? Application Layer
- When data are transmitted form device A to Device B, the header from A's layer 5 is ready by B's ...Session Layer..
- The application layer of a network ..Consist of software being run on the computer connected to the network.
- A ..Repeater.. receives signals and , before it becomes too weak or corrupted, regenerates the original bit pattern. it then sents the refreshed signal.
- A ...Bridge ...Operates in both physical and datalink layer.
- Transmission media lie below which layer of OSI Model..Physical Layer.
- Repeater operates in which layer of the OSI Model? Physical layer.
- Which layer is international standard organization's OSI model responsible for creating and recognizing frame boundaries? Network Layer
- MAC address works on which layer of OSI Model? Layer 2
- IP address works on which layer of OSI Model? Layer 3
- Which Layer of OSI determines the interface of the system with the users?Application Layer
Great — you already have a solid base 👍
I’ll generate 100 MCQs on the OSI model in the same style you used (with answers inline).
100 MCQs on OSI Model
The OSI model has ...7 layers...
The topmost layer of OSI model is ...Application Layer...
The lowest layer of OSI model is ...Physical Layer...
Which layer handles routing? ...Network Layer...
Which layer ensures reliable delivery? ...Transport Layer...
Which layer is responsible for framing? ...Data Link Layer...
Which layer deals with signals and transmission? ...Physical Layer...
Which layer provides services to end users? ...Application Layer...
Which layer handles session establishment? ...Session Layer...
Which layer is responsible for encryption? ...Presentation Layer...
Which layer performs error detection and correction? ...Data Link Layer...
Which layer manages logical addressing? ...Network Layer...
Which layer handles flow control? ...Transport Layer...
Which layer translates data formats? ...Presentation Layer...
Which layer controls dialog between devices? ...Session Layer...
Which layer uses MAC address? ...Data Link Layer...
Which layer uses IP address? ...Network Layer...
Which layer divides data into segments? ...Transport Layer...
Which layer defines voltage levels? ...Physical Layer...
Which layer is closest to user? ...Application Layer...
Which device works at Physical Layer? ...Repeater...
Which device works at Data Link Layer? ...Switch...
Which device works at Network Layer? ...Router...
Gateway operates on ...All layers...
Hub operates on ...Physical Layer...
Bridge operates on ...Data Link Layer...
Switch operates on ...Data Link Layer...
Router operates on ...Network Layer...
Modem works on ...Physical Layer...
Firewall works on ...Network/Transport Layer...
Data unit of Physical Layer is ...Bits...
Data unit of Data Link Layer is ...Frame...
Data unit of Network Layer is ...Packet...
Data unit of Transport Layer is ...Segment...
Data unit of Application Layer is ...Message...
Which layer adds header and trailer? ...Data Link Layer...
Which layer provides connection-oriented service? ...Transport Layer...
Which layer handles multiplexing? ...Transport Layer...
Which layer supports email service? ...Application Layer...
Which layer supports file transfer? ...Application Layer...
FTP works at ...Application Layer...
HTTP works at ...Application Layer...
SMTP works at ...Application Layer...
DNS works at ...Application Layer...
Telnet works at ...Application Layer...
TCP works at ...Transport Layer...
UDP works at ...Transport Layer...
IP works at ...Network Layer...
ARP works at ...Data Link Layer...
Ethernet works at ...Data Link Layer...
Which layer ensures synchronization? ...Session Layer...
Which layer performs compression? ...Presentation Layer...
Which layer establishes connection? ...Transport Layer...
Which layer terminates session? ...Session Layer...
Which layer handles addressing? ...Network Layer...
Which layer handles physical topology? ...Physical Layer...
Which layer handles logical topology? ...Data Link Layer...
Which layer is responsible for packet forwarding? ...Network Layer...
Which layer uses ports? ...Transport Layer...
Which layer uses sockets? ...Transport Layer...
Which layer ensures error-free transmission? ...Transport Layer...
Which layer provides virtual circuit? ...Network Layer...
Which layer fragments data? ...Network Layer...
Which layer reassembles data? ...Transport Layer...
Which layer uses checksum? ...Transport Layer...
Which layer uses CRC? ...Data Link Layer...
Which layer performs bit synchronization? ...Physical Layer...
Which layer controls access to media? ...Data Link Layer...
Which layer uses switches? ...Data Link Layer...
Which layer uses routers? ...Network Layer...
Which layer uses repeaters? ...Physical Layer...
Which layer uses gateways? ...All Layers...
Which layer defines frame boundaries? ...Data Link Layer...
Which layer detects errors? ...Data Link Layer...
Which layer corrects errors? ...Transport Layer...
Which layer provides acknowledgment? ...Transport Layer...
Which layer ensures ordered delivery? ...Transport Layer...
Which layer supports multicast? ...Network Layer...
Which layer supports broadcasting? ...Data Link Layer...
Which layer supports unicasting? ...Network Layer...
Which layer handles congestion control? ...Transport Layer...
Which layer supports remote login? ...Application Layer...
Which layer handles file sharing? ...Application Layer...
Which layer provides web services? ...Application Layer...
Which layer supports voice over IP? ...Application Layer...
Which layer translates ASCII to EBCDIC? ...Presentation Layer...
Which layer handles dialog control? ...Session Layer...
Which layer handles token management? ...Session Layer...
Which layer establishes checkpoints? ...Session Layer...
Which layer manages communication session? ...Session Layer...
Which layer handles encryption/decryption? ...Presentation Layer...
Which layer defines data syntax? ...Presentation Layer...
Which layer ensures compatibility? ...Presentation Layer...
Which layer interacts with software applications? ...Application Layer...
Which layer supports network services? ...Application Layer...
Which layer interfaces directly with user? ...Application Layer...
Which layer is responsible for data representation? ...Presentation Layer...
Which layer provides process-to-process delivery? ...Transport Layer...
Which layer provides node-to-node delivery? ...Data Link Layer...
Which layer provides host-to-host delivery? ...Transport Layer...
ULTRA HARD OSI MCQs (100)
If a packet is lost during transmission and retransmitted from source, which layer is responsible? ...Transport Layer...
If a frame is corrupted and retransmitted between two nodes, which layer handles it? ...Data Link Layer...
If data arrives out of order and is rearranged, which layer is responsible? ...Transport Layer...
If two applications communicate simultaneously using same IP, which layer distinguishes them? ...Transport Layer...
If encryption is applied before transmission and removed at receiver, which layer is responsible? ...Presentation Layer...
If a device only regenerates signals without understanding data, it works at ...Physical Layer...
If a device filters traffic using MAC address, it works at ...Data Link Layer...
If a device routes packets between networks, it works at ...Network Layer...
If a device translates between protocols of different architectures, it works at ...All layers (Gateway)...
If communication session is interrupted and later resumed, which layer handles it? ...Session Layer...
Which layer ensures data is delivered to correct process, not just device? ...Transport Layer...
Which layer ensures correct path selection across networks? ...Network Layer...
Which layer ensures error-free link between adjacent nodes only? ...Data Link Layer...
Which layer ensures bit-level synchronization across medium? ...Physical Layer...
Which layer ensures syntax correctness of transmitted data? ...Presentation Layer...
If two computers use different character encoding (ASCII vs Unicode), which layer resolves it? ...Presentation Layer...
If a communication requires login authentication before data exchange, which layer is involved? ...Application Layer...
If a session token is used to maintain state, which layer manages it? ...Session Layer...
If a packet is fragmented due to smaller MTU, which layer performs it? ...Network Layer...
If retransmission happens due to timeout at receiver, which layer handles it? ...Transport Layer...
Which layer is responsible when duplicate packets are detected and discarded? ...Transport Layer...
Which layer ensures no duplicate frames between two nodes? ...Data Link Layer...
Which layer ensures signal strength remains sufficient? ...Physical Layer...
Which layer ensures data format compatibility across systems? ...Presentation Layer...
Which layer ensures session checkpoint recovery after crash? ...Session Layer...
If a switch forwards frames using MAC table, it operates at ...Data Link Layer...
If a router uses routing table, it operates at ...Network Layer...
If TCP ensures reliability, it belongs to ...Transport Layer...
If IP provides best-effort delivery, it belongs to ...Network Layer...
If UDP is used for faster transmission without reliability, it belongs to ...Transport Layer...
If data is compressed before sending, which layer performs it? ...Presentation Layer...
If communication is simplex or duplex, which layer defines it? ...Physical Layer...
If session needs synchronization points, which layer manages it? ...Session Layer...
If data is divided into frames, which layer performs it? ...Data Link Layer...
If packets are routed dynamically, which layer is responsible? ...Network Layer...
If checksum is used for end-to-end error detection, which layer is involved? ...Transport Layer...
If CRC is used for frame error detection, which layer is involved? ...Data Link Layer...
If parity bit is used, which layer handles it? ...Physical Layer...
If port numbers identify services, which layer is responsible? ...Transport Layer...
If URL is accessed in browser, which layer is used? ...Application Layer...
Which layer ensures flow control between sender and receiver processes? ...Transport Layer...
Which layer ensures flow control between directly connected nodes? ...Data Link Layer...
Which layer ensures logical addressing independent of hardware? ...Network Layer...
Which layer ensures physical addressing tied to hardware? ...Data Link Layer...
Which layer ensures data confidentiality using encryption? ...Presentation Layer...
Which layer ensures session termination after communication ends? ...Session Layer...
Which layer ensures data conversion into readable format? ...Presentation Layer...
Which layer ensures user interface with network services? ...Application Layer...
Which layer ensures signal modulation/demodulation conceptually? ...Physical Layer...
Which layer ensures logical connection between processes? ...Transport Layer...
If congestion occurs and packets are dropped, which layer handles it? ...Network Layer...
If retransmission is triggered due to lost acknowledgment, which layer handles it? ...Transport Layer...
If frame is lost between nodes, which layer retransmits it? ...Data Link Layer...
If physical signal is distorted, which layer deals with it? ...Physical Layer...
If data format mismatch occurs, which layer resolves it? ...Presentation Layer...
If a user sends email, which layer starts the process? ...Application Layer...
If encryption is applied before sending email, which layer handles it? ...Presentation Layer...
If session is created for email transfer, which layer manages it? ...Session Layer...
If email is divided into segments, which layer handles it? ...Transport Layer...
If segments are converted into packets, which layer handles it? ...Network Layer...
If packets are converted into frames, which layer handles it? ...Data Link Layer...
If frames are converted into bits, which layer handles it? ...Physical Layer...
Reverse process at receiver follows layers from ...Physical to Application...
Encapsulation occurs from ...Application to Physical...
Decapsulation occurs from ...Physical to Application...
Which layer is responsible for adding port number in header? ...Transport Layer...
Which layer is responsible for adding IP address in header? ...Network Layer...
Which layer is responsible for adding MAC address in header? ...Data Link Layer...
Which layer is responsible for bit transmission without header? ...Physical Layer...
Which layer is responsible for application-specific protocols? ...Application Layer...
Which layer ensures interoperability between different vendors? ...Presentation Layer...
Which layer ensures session persistence across communication? ...Session Layer...
Which layer ensures error-free communication across entire path? ...Transport Layer...
Which layer ensures efficient path utilization? ...Network Layer...
Which layer ensures correct signal timing? ...Physical Layer...
Which layer handles data encapsulation order correctly? ...All layers sequentially...
Which layer handles data decapsulation order correctly? ...All layers in reverse...
Which layer ensures logical communication between peer layers? ...All layers...
Which layer is responsible for protocol translation between systems? ...Presentation Layer...
Which layer ensures service interface to end user? ...Application Layer...
If a packet travels through 3 routers, which layer is active at each hop? ...Network Layer...
If frame is checked at every hop, which layer is active? ...Data Link Layer...
If end-to-end reliability is ensured once, which layer is active? ...Transport Layer...
If bits are transmitted across medium, which layer is active? ...Physical Layer...
If application requests data, which layer starts communication? ...Application Layer...
Which layer ensures data integrity across entire communication? ...Transport Layer...
Which layer ensures frame integrity only between nodes? ...Data Link Layer...
Which layer ensures signal integrity? ...Physical Layer...
Which layer ensures data interpretation? ...Presentation Layer...
Which layer ensures communication session control? ...Session Layer...
Which layer ensures multiplexing of multiple applications? ...Transport Layer...
Which layer ensures routing between different networks? ...Network Layer...
Which layer ensures media access coordination? ...Data Link Layer...
Which layer ensures physical connectivity? ...Physical Layer...
Which layer ensures user-level services? ...Application Layer...
Which layer ensures connection setup and teardown reliability? ...Transport Layer...
Which layer ensures best-effort packet delivery without guarantee? ...Network Layer...
Which layer ensures frame delivery using hardware addressing? ...Data Link Layer...
Which layer ensures bit stream delivery across medium? ...Physical Layer...
Which layer ensures end-user interaction with network? ...Application Layer...
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