Match the following.a Hub i Data link layer b Switch ii Network layer c Routers iii Application layer d Gateway iv Physical layer
a - iv, b - i, c - ii, d - iii
Matching Network Devices with OSI Model Layers
Understanding which network device operates at which layer of the OSI (Open Systems Interconnection) model is fundamental in computer networking. Different devices perform different functions and process data based on the information available at their specific OSI layers.
Analyzing the Matches
Let's break down each network device and its corresponding OSI layer:
- Hub: A hub is a basic network device that operates at the Physical Layer (Layer 1) of the OSI model. It simply broadcasts data received on one port to all other connected ports. It does not read MAC addresses or IP addresses; it only deals with the raw bit stream.
- Switch: A switch operates at the Data Link Layer (Layer 2) of the OSI model. It uses MAC addresses to forward data frames to the correct destination port, rather than broadcasting to all ports like a hub. This makes network communication more efficient.
- Router: A router operates at the Network Layer (Layer 3) of the OSI model. It uses IP addresses to route data packets between different networks. Routers are responsible for determining the best path for data to travel across interconnected networks.
- Gateway: A gateway is a device that connects two networks that may use different protocols. Gateways can operate at any layer, but they commonly function at the Application Layer (Layer 7) or multiple layers to translate between different protocols and network architectures. They act as an entry and exit point for a network and handle protocol conversions.
Matching the Given Pairs
Based on the above analysis, we can match the devices to their respective OSI layers:
a. Hub → Physical layer (Layer 1)
b. Switch → Data link layer (Layer 2)
c. Router → Network layer (Layer 3)
d. Gateway → Application layer (Layer 7)
| Device | OSI Layer |
|---|---|
| Hub | Physical Layer (Layer 1) |
| Switch | Data Link Layer (Layer 2) |
| Router | Network Layer (Layer 3) |
| Gateway | Application Layer (Layer 7) (Often operates at multiple layers) |
Therefore, the correct matching is: a - iv, b - i, c - ii, d - iii.
Revision Table: Network Devices and OSI Layers
| Device | Key Function | OSI Layer |
|---|---|---|
| Hub | Signal distribution, broadcasting | Physical (Layer 1) |
| Switch | Frame forwarding based on MAC address | Data Link (Layer 2) |
| Router | Packet routing based on IP address | Network (Layer 3) |
| Gateway | Connects networks using different protocols, protocol translation | Application (Layer 7) / Multiple Layers |
Additional Information: The OSI Model
The OSI model is a conceptual framework used to describe the functions of a networking system. It divides network communication into seven layers. Understanding these layers helps in troubleshooting and designing network systems.
The seven layers from top to bottom are:
- Application Layer (Layer 7)
- Presentation Layer (Layer 6)
- Session Layer (Layer 5)
- Transport Layer (Layer 4)
- Network Layer (Layer 3)
- Data Link Layer (Layer 2)
- Physical Layer (Layer 1)
Different network devices operate at different layers, processing information relevant to that layer.
Important Questions from Concept of Layering
Every network adaptor has a unique identity in the form of a _______.
Match the following:
List - I
List - II
A. Data link layer
I. Encryption
B. Network layer
II. Connection control
C. Transport layer
III. Routing
D. Presentation layer
IV. Framing
Match List I with List II
List I
List II
(A) Serial Line IP (SLIP)
(I) Application layer)
(B) Border Gateway Protocol (BGP)
(II) Transport layer
(C) User Data Protocol (UDP)
(III) Data Link layer
(D) Simple Network Management
(IV) Network layer
Choose the correct answer from the options given below:
Match List I with List II:
List I List II (A) Physical layer (I) Routing of the signals divide the outgoing message into packets. to act as network controller for routing data (B) Data link layer (II) Make and break connections, define voltages and data rates, convert data bits into electrical signal (C) Network layer (III) Synchronization, error detection and correction. To assemble outgoing message into frames. (D) Presentation layer (IV) It works as a translating layer Choose the correct answer from the options given below:
Match List I with List II
List I List II A. Data Link Layer I. True end‐to‐end layer B. Network Layer II. Token Management C. Transport Layer III. Produce billing information D. Session Layer IV. Piggybacking Choose the correct answer from the options given below :
