Part 1.1

Given a scenario where a user sends an email, identify which OSI layer is responsible for ensuring the email data is properly segmented and reassembled at the destination.

• Physical Layer

• Transport Layer

• Network Layer

• Application Layer

Suppose a network administrator needs to troubleshoot a problem where data packets are not reaching the correct destination. Which OSI layer should the administrator focus on to resolve routing issues?

• Data Link Layer

• Network Layer

• Session Layer

• Presentation Layer

A file is being transferred over a network. Match the correct protocol to the OSI layer it operates in: FTP.

• Presentation Layer

• Application Layer

• Transport Layer

• Network Layer

During the data encapsulation process, at which OSI layer is a frame created, and what is its primary function?

• Network Layer; logical addressing

• Data Link Layer; physical addressing and error detection

• Transport Layer; segmentation

• Application Layer; user interface

Compare the OSI and TCP/IP models: Which OSI layers are combined into a single layer in the TCP/IP model, and what is the name of that layer in TCP/IP?

• Application, Presentation, and Session; Application Layer

• Network and Data Link; Internet Layer

• Transport and Network; Host-to-Host Layer

• Physical and Data Link; Network Access Layer

A user is streaming a video online. Which OSI layer is primarily responsible for maintaining the session between the user's device and the streaming server, and what is its function?

• Session Layer; manages and controls dialog between devices

• Presentation Layer; encrypts and decrypts data

• Network Layer; routes data packets

• Data Link Layer; error detection

If a network device is responsible for converting digital data into signals suitable for transmission over a physical medium, which OSI layer does this device operate at, and what is an example of such a device?

• Physical Layer; Hub

• Data Link Layer; Switch

• Network Layer; Router

• Transport Layer; Gateway

Analyze the process of data encapsulation: At which OSI layer is a packet created, and what information does it typically contain?

• Data Link Layer; MAC addresses

• Network Layer; logical addresses (IP addresses)

• Transport Layer; port numbers

• Application Layer; user data

A company wants to ensure that data sent over its network is encrypted and compressed before transmission. Which OSI layer should be configured to handle these tasks, and why?

• Presentation Layer; it handles data translation, encryption, and compression

• Application Layer; it provides network services to applications

• Session Layer; it manages sessions

• Transport Layer; it ensures reliable data transfer

In a real-world scenario, a web browser communicates with a web server using HTTP. Identify the OSI layer involved and explain its role in this communication.

• Application Layer; provides network services directly to user applications

• Network Layer; routes data between devices

• Data Link Layer; manages physical addressing

• Transport Layer; segments and reassembles data