A company wants to convert data formats between different systems. Which OSI layer should handle this?
Answer: C
The Presentation Layer (Layer 6) handles data translation, encryption, compression, and format conversion (e.g., ASCII to EBCDIC).
Q.2Medium
Which of the following is NOT a function of the Application Layer (Layer 7)?
Answer: C
MAC address resolution (ARP) happens at Layer 2 (Data Link Layer). Layer 7 provides user-facing services like HTTP, SMTP, and FTP.
Q.3Medium
In the OSI model, which layers are considered the 'Media Layers'?
Answer: A
Layers 1-3 (Physical, Data Link, and Network) are called Media Layers as they deal with network transmission and routing.
Q.4Medium
Which device operates primarily at Layer 3 of the OSI model?
Answer: C
Routers operate at Layer 3 and use IP addresses to route packets between different networks. Hubs and repeaters work at Layer 1, switches at Layer 2.
Q.5Medium
TCP/IP model has fewer layers than the OSI model. How many layers does the TCP/IP model have?
Answer: B
The TCP/IP model has 4 layers: Link, Internet, Transport, and Application layers. Some variations include 5 layers by splitting the Link layer.
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Q.6Medium
A packet arrives at a router with a damaged frame header. At which OSI layer should this be detected?
Answer: B
The Data Link Layer (Layer 2) uses CRC (Cyclic Redundancy Check) to detect frame errors and corruption in the frame header.
Q.7Medium
Which of the following scenarios requires Layer 7 (Application Layer) involvement?
Answer: B
HTTPS (web browsing) is an Application Layer protocol. A, C, and D belong to Presentation, Network, and Physical layers respectively.
Q.8Medium
A company experiences intermittent network connectivity issues. When troubleshooting, an administrator discovers that the issue occurs only when data passes through a specific gateway. At which OSI layer(s) should the administrator focus their investigation?
Answer: B
A gateway typically operates at Layer 3 (routing) and Layer 4 (protocol conversion), and may involve Layer 7 for application-level filtering. Issues at the gateway level suggest Layer 3-4 problems.
Q.9Medium
During a network audit, it is discovered that HTTP traffic is being intercepted and modified. At which minimum OSI layer would a device need to operate to perform this attack?
Answer: D
HTTP is an Application Layer (Layer 7) protocol. To intercept and modify HTTP traffic, an attacker must operate at Layer 7 where the actual content is accessible.
Q.10Medium
What is the relationship between the TCP/IP model and the OSI model in terms of functionality?
Answer: B
The TCP/IP model's Application Layer combines the functionality of OSI Layers 5 (Session), 6 (Presentation), and 7 (Application).
Q.11Medium
A network administrator needs to implement a solution to prevent unauthorized access to sensitive data transmitted over the network. Which OSI layer would be most appropriate for implementing encryption?
Answer: C
The Presentation Layer (Layer 6) is responsible for data encryption, decryption, compression, and translation, making it the appropriate layer for implementing encryption services.
Q.12Medium
In a corporate network, certain applications require guaranteed delivery and error checking, while others prioritize speed. Which Layer 4 protocols would best serve these requirements respectively?
Answer: C
TCP provides reliable, ordered delivery with error checking; UDP prioritizes speed with minimal overhead. Choice of protocol depends on application requirements.
Q.13Medium
A manufacturing facility's IoT devices communicate using raw bit transmission over twisted pair cables. Which OSI layer(s) are being utilized?
Answer: A
Raw bit transmission over physical media (twisted pair cables) involves Layer 1 (Physical Layer). Data Link Layer (Layer 2) protocols handle the framing and transmission rules for these bits.
Q.14Medium
Which of the following statements correctly describes the role of the Session Layer (Layer 5) in the OSI model?
Answer: B
The Session Layer (Layer 5) manages dialogues between applications, handling session establishment, maintenance, synchronization, and termination.
Q.15Medium
A packet sniffer tool captures data at Layer 2. Which information would be visible in the captured frames?
Answer: B
Layer 2 (Data Link Layer) operates with MAC addresses and frames. IP addresses (Layer 3) and application data (Layer 7) would not be directly visible at Layer 2 without further analysis.
Q.16Medium
In a scenario where a web server receives requests from multiple clients simultaneously, at which OSI layer would connection management and multiplexing be handled to ensure proper session isolation?
Answer: B
The Transport Layer (Layer 4) uses port numbers to manage multiple simultaneous connections and ensures proper multiplexing and demultiplexing of data streams.
Q.17Medium
An organization implements Quality of Service (QoS) policies for video streaming. At which OSI layer would bandwidth prioritization rules primarily be enforced?
Answer: C
QoS policies are typically enforced at the Transport Layer using protocols like DSCP and traffic shaping techniques to prioritize critical traffic.
Q.18Medium
A network administrator notices that devices can connect physically but cannot communicate. After checking cables and signals, the issue remains. Which layers should be investigated?
Answer: C
Physical connectivity (Layer 1) works, so the issue is likely at Layer 2 (MAC addressing/switching) or Layer 3 (IP routing/addressing).
Q.19Medium
When a web browser displays encrypted HTTPS content correctly on the user's screen, which layers have successfully completed their functions in the correct sequence?
Answer: B
All seven layers must function correctly: physical transmission (1), framing (2), routing (3), TCP connection (4), session (5), decryption (6), and HTML rendering (7).
Q.20Medium
Which statement correctly describes the relationship between protocols and OSI layers?
Answer: B
Protocols like TCP/IP stack operate across multiple layers; HTTP spans layers 6-7, while TCP operates at layer 4.
