WorksheetsThe Open Systems Interconnection (OSI) Reference Model
Total questions: 99
Worksheet time: 51mins
What is the name of Layer 1 in the OSI reference model?
Physical
Data Link
Network
Transport
What is the name of Layer 2 in the OSI reference model?
Data link
Network
Session
Presentation
What is the name of Layer 3 in the OSI reference model?
Network
Session
Presentation
Physical
What is the name of Layer 4 in the OSI reference model?
Transport
Session
Network
Presentation
What is the name of Layer 5 in the OSI reference model?
Session
Presentation
Transport
Network
What is the name of Layer 6 in the OSI reference model?
Presentation
Session
Transport
Network
What is the name of Layer 7 in the OSI reference model?
Application
Presentation
Session
Transport
Fill in the blank: The Internet is ___ .
a global system of computer networks interconnected through telecommunications (wired) and (wireless) networking
a single computer used for personal tasks
a type of software for editing documents
a local area network in a single building
Fill in the blank: The World Wide Web (www) is a global collection of ________.
webpages
computers
databases
servers
Fill in the blank: When google.com is typed into the web browser, the web browser sends a request to a ________ server to locate Google’s IP address.
DNS
FTP
SMTP
DHCP
Fill in the blank: Once the IP address has been located, ________ between devices is initiated.
communication
disconnection
encryption
fragmentation
Which of the following is the correct order of the key layers of the Internet from top to bottom as shown in the diagram?
A) CONTENT, SEARCH ENGINE, BROWSERS, WORLD WIDE WEB, INTERNET, NETWORKS, COMPUTERS
B) COMPUTERS, NETWORKS, INTERNET, WORLD WIDE WEB, BROWSERS, SEARCH ENGINE, CONTENT
C) CONTENT, BROWSERS, SEARCH ENGINE, WORLD WIDE WEB, INTERNET, NETWORKS, COMPUTERS
D) CONTENT, WORLD WIDE WEB, SEARCH ENGINE, BROWSERS, INTERNET, NETWORKS, COMPUTERS
Ethernet Header Frame: Maximum Transmission Units, what is the standard size?
64 - 1500 Bytes
46 - 1500 Bytes
1,500 - 9,000 Bytes
Less Than 64 Bytes
Greater than 1,500 Bytes
The OSI Model is:
a conceptual framework that standardizes the functions of a telecommunication or computing system into seven layers
a programming language used for network communication
a type of hardware device for internet connectivity
an operating system for managing network resources
The purpose of the object shown in the image is:
To measure temperature
To store liquids
To cut materials
To generate electricity
What is the OSI (Open Systems Interconnection) Model?
The OSI Model is a 7 layer conceptual reference model for the coordination of networking standards and network connectivity throughout the internet.
The OSI Model is a hardware device used to connect computers in a network.
The OSI Model is a programming language for developing network applications.
The OSI Model is a type of operating system for managing network resources.
Name the first layer of the OSI Model.
Physical
Network
Session
Application
Name the second layer of the OSI Model.
Data Link
Network
Physical
Transport
Name the third layer of the OSI Model.
Network
Presentation
Session
Physical
Name the fourth layer of the OSI Model.
Transport
Session
Network
Presentation
Name the fifth layer of the OSI Model.
Session
Presentation
Network
Physical
Name the sixth layer of the OSI Model.
Presentation
Session
Transport
Network
Name the seventh layer of the OSI Model.
Application
Session
Network
Data Link
What is the main purpose of the OSI model?
Standardization and Troubleshooting
Data Encryption
Hardware Manufacturing
User Authentication
Which of the following is a purpose of the OSI model?
A) Standardization of network protocols for communication across the World Wide Web
B) Increasing the speed of processors
C) Reducing the size of hardware
D) Improving battery life
The OSI model helps in standardization for network product development, ensuring ______ and ______ compatibility.
software and hardware
speed and bandwidth
protocol and topology
user and administrator
True or False: Before the OSI model, manufacturers could use each other's devices without any issues.
True
False
Match the OSI layer to its correct function:
Data representation and encryption
6
End-to-end connections and reliability
4
Path determinations and IP (logical addressing)
3
MAC and LLC (physical addressing)
2
Media, signal, and binary transmission
1
Which OSI layer is responsible for end-to-end connections and reliability?
Application
Transport
Network
Data Link
Fill in the blank: The function of the Network layer in the OSI model is _________
Path determinations and IP (logical addressing)
Data encryption and decryption
Physical transmission of signals
Session management and synchronization
Which data unit is associated with the Data Link layer in the OSI model?
Frames
Packets
Segments
Bits
Fill in the blank: The Presentation layer in the OSI model is responsible for _________?
Data representation and encryption
Routing and switching
Physical transmission of data
Session management
Which OSI layer deals with media, signal, and binary transmission?
Physical
Data Link
Network
Application
Fill in the blank: The data unit at the Transport layer in the OSI model is called _________.
Segments
Frames
Packets
Bits
Which layer of the OSI Model is responsible for providing services/protocols to applications?
Physical
Application
Network
Data-Link
Fill in the blank: The ________ layer of the OSI Model is responsible for data formatting, compression, and encryption.
Presentation
Session
Transport
Physical
Which OSI layer is responsible for end-to-end delivery and logical addressing?
Network
Session
Data-Link
Physical
Fill in the blank: The ________ layer of the OSI Model is responsible for physical addressing and error detection.
Data-Link
Application
Network
Presentation
Which layer of the OSI Model corresponds to the 'Segment' encapsulation unit?
Application
Transport
Network
Data-Link
The Physical layer of the OSI Model is responsible for media interface and signal strength.
True
False
Fill in the blank: The ________ layer of the OSI Model controls conversations/sessions, including dialog control and integrity.
Session
Presentation
Transport
Physical
Which of the following is NOT a function of the Transport layer in the OSI Model?
Fragmentation/Sequencing of data
Data formatting
Reliable delivery
Flow control
Match the OSI Model layers with their encapsulation units:
Data
5
Segment
4
Packet or Datagram
3
Frame
2
Bit or Data-Stream
1
What is the name of Layer 7 in the OSI model?
Application
Presentation
Session
Transport
What is the name of Layer 6 in the OSI model?
Presentation
Session
Transport
Network
What is the name of Layer 5 in the OSI model?
Session
Presentation
Network
Data Link
What is the name of Layer 4 in the OSI model?
Transport
Session
Network
Presentation
What is the name of Layer 3 in the OSI model?
Network
Session
Presentation
Physical
What is the name of Layer 2 in the OSI model?
Data Link
Network
Session
Physical
What is the name of Layer 1 in the OSI model?
Physical
Data Link
Network
Session
What mnemonic is suggested to memorize the 7 OSI layers?
All People Seem To Need Data Processing
Please Do Not Throw Sausage Pizza Away
All People Seem To Need Data Processing
A Pretty Silly Trick Never Does Pay
Select the mnemonic commonly used to memorize the 7 layers of the OSI model.
Please Do Not Throw Sausage Pizza Away
Every Good Boy Deserves Fudge
King Philip Came Over For Good Soup
My Very Educated Mother Just Served Us Noodles
The OSI layers are processed in which order?
From the application layer to the physical layer and vice versa
Randomly between layers
Only from the physical layer to the application layer
Only from the application layer to the physical layer
What is Layer 7 of the OSI model?
Application
Session
Transport
Network
What is Layer 6 of the OSI model?
Presentation
Session
Transport
Network
What is Layer 5 of the OSI model?
Session
Presentation
Network
Physical
What is Layer 4 of the OSI model?
Transport
Session
Network
Presentation
What is Layer 3 of the OSI model?
Network
Session
Presentation
Physical
What is Layer 2 of the OSI model?
Data Link
Network
Transport
Session
What is Layer 1 of the OSI model?
Physical
Data Link
Network
Transport
Which of the following is the correct order of OSI layers from top to bottom ?
A) Application, Presentation, Session, Transport, Network, Data Link, Physical
B) Physical, Data Link, Network, Transport, Session, Presentation, Application
C) Application, Session, Presentation, Transport, Network, Data Link, Physical
D) Physical, Network, Data Link, Transport, Session, Presentation, Application
Fill in the blank: The process of adding headers and trailers to data as it moves down the OSI layers is called _________.
Encapsulation
Decapsulation
Fragmentation
Multiplexing
At which OSI layer is the 'Segment header' added during encapsulation?
Transport layer
Physical layer
Data Link layer
Network layer
Match the following OSI layers with the corresponding headers/trailers added during encapsulation as shown in the diagram:
Frame header and Frame trailer
Data Link Layer
Packet header
Network Layer
Segment header
Transport Layer
According to the diagram, the Physical layer is responsible for converting data into bits for transmission.
True
False
What is the main function of Layer 7: Application in the OSI model?
Provides network services & applications to end users
Handles routing of data
Encrypts data
Manages physical connections
Which of the following is NOT an example of an Application Layer protocol?
ftp
smtp
ssh
arp
Fill in the blank: The Protocol Data Unit (PDU) for the Application Layer is _______.
Data
Segment
Frame
Packet
A "Hello!" message is sent using an application; for example, _______ to Layer 6.
calculator
paint
notepad
What does the Application Layer do when a user requests content from a website?
Encrypts the data
Requests content and returns it in the required format
Manages physical connections
Handles error correction
What is the main function of Layer 6: Presentation in the OSI model?
Routing data
Compressing and translating data from human readable text to machine program language
Physical transmission of data
Error detection
Layer 6 encrypts data using _______ when receiving and decrypts data when returning response.
SSL/TLS
FTP
HTTP
SSH
Which of the following is NOT a function of the Presentation Layer?
A) Encryption
B) Compression
C) Translation
D) Routing
The PDU (Protocol Data Unit) for the Presentation Layer is: _______
Data
Segment
Frame
Packet
The Presentation Layer receives data from Layer 7 and sends it to Layer 5 after encoding, compressing, and encrypting it.
True
False
What is the main function of Layer 5: Session in the OSI model?
To manage session connections between applications with functions like session synchronization and checkpointing.
To provide reliable data transfer and error correction between nodes.
To define the electrical and physical specifications for devices.
To handle routing and forwarding of data packets across networks.
Layer 5: Session is responsible for establishing, maintaining, and terminating sessions.
True
False
What does checkpointing do in the context of the session layer?
Checkpointing marks the state of a session, so in case of an application crash or power failure, the session can be resumed from the last checkpoint.
Checkpointing encrypts all data transmitted during a session for security purposes.
Checkpointing establishes a physical connection between two devices on a network.
Checkpointing compresses session data to reduce bandwidth usage.
Which of the following is NOT a responsibility of the session layer?
A) Authentication and authorization
B) Routing packets
C) Establishing sessions
D) Terminating sessions
If logged in via a session cookie, what information will be attached to the message?
The session info will be attached to the message and the receiver will know the message came from the sender.
The message will be encrypted with the sender's private key.
Only the sender's IP address will be attached to the message.
No additional information will be attached to the message.
What is the PDU (Protocol Data Unit) for the session layer?
Data
Segment
Frame
Packet
This diagram represents which concept in the context of networking?
The layers of the OSI model
The TCP/IP protocol suite
Network topologies
Data encryption methods
What are the two main data transmission protocols used at the Transport Layer?
TCP (Transmission Control Protocol) and UDP (User Datagram Protocol)
FTP (File Transfer Protocol) and SMTP (Simple Mail Transfer Protocol)
HTTP (HyperText Transfer Protocol) and HTTPS (HyperText Transfer Protocol Secure)
IP (Internet Protocol) and ARP (Address Resolution Protocol)
Which protocol is connection-oriented and requires that every packet is received?
TCP (Transmission Control Protocol)
UDP (User Datagram Protocol)
Which protocol is connectionless and does not require that every packet is received?
TCP (Transmission Control Protocol)
UDP (User Datagram Protocol)
What is the Protocol Data Unit (PDU) at the Transport Layer?
Segment
Frame
Packet
Bit
What is the main function of the Transport Layer as illustrated in the diagram?
The main function is to segment data, transport it, and reassemble it at the destination.
The main function is to provide physical connections between devices.
The main function is to encrypt and decrypt data for security.
The main function is to assign IP addresses to devices on the network.
Traffic determines whether to use TCP or UDP based on the requirements of the application or protocol being used.
By the requirements of the application or protocol
By the speed of the network connection
By the type of device being used
By the physical location of the user
How can traffic tell whether to use TCP or UDP?
By looking at the segment header
By checking the IP address
By using the application protocol
By the port number
Which header contains more fields: TCP or UDP?
TCP header contains more fields than the UDP header.
UDP header contains more fields than the TCP header.
Both headers contain the same number of fields.
Neither header contains any fields.
What is the first step in the TCP 3-way handshake process?
Server sends a SYN to the client
Client sends a SYN to the server
Client sends an ACK to the server
Server sends a SYN/ACK to the client
In the TCP 3-way handshake, what does the server return to the client after receiving a SYN?
ACK
SYN
SYN/ACK
FIN
In what order is the 3-way handshake processed?
(a)
(b)
(c)
After the TCP 3-way handshake has been completed, what do the Client and the Server begin to exchange?
Packets
Data transferred in Segments
Files
Messages
The Client and Server keep track of the segments by using ________ numbers.
sequence
random
prime
even
For every byte that is sent, the sequence number is incremented by how much?
One
Two
Ten
It does not increment
How many fields does the UDP Header consist of?
2
3
4
5
Does UDP perform a 3-way handshake?
Yes
No
Which field is present in the TCP Segment Header Format but not in the UDP Datagram Header Format?
Sequence Number
Acknowledgment Number
Flags
Window Size
