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Question

__________is a passage to connect two networks that may work on different networking models.

This question was previously asked in
SSC CGL 2022 Tier-II (Paper 2 JSO) Previous Year Paper (04-Mar-2023)
The correct answer is

Gateway

Understanding Devices for Connecting Different Networks

Networking devices play a crucial role in connecting computers and networks. Different devices are used depending on the type of connection needed, ranging from connecting devices within a single network to connecting entirely different networks that might use incompatible communication methods or protocols.

The question asks for a passage or device that connects two networks that may work on different networking models. This implies a device capable of translating or converting protocols or addressing schemes between the two networks.

Analyzing the Options for Connecting Different Networks

Let's look at the provided options and their typical functions in networking:

  • Router: Routers connect networks, typically local area networks (LANs) or wide area networks (WANs). They operate at the network layer (Layer 3) of the OSI model, forwarding data packets based on IP addresses. While routers connect different networks, they usually operate within the same networking model, using IP addresses for routing decisions.
  • Switch: Switches connect devices within a single network segment or LAN. They operate at the data link layer (Layer 2), forwarding data frames based on MAC addresses. A switch does not connect different networks in the way described in the question; it connects devices within the same network.
  • Gateway: A gateway is a network node that connects two different networks that may use different protocols. It acts as an entry and exit point for a network. Gateways can operate at various layers of the OSI model, including the application layer, performing functions like protocol conversion or translating addressing schemes. This makes a gateway suitable for connecting networks that operate on fundamentally different networking models or protocols.
  • Hub: A hub is a simple network device that connects multiple devices together within a single network segment. It operates at the physical layer (Layer 1) and simply broadcasts data received on one port to all other ports. Hubs are outdated and less efficient than switches; they do not connect different networks.

Identifying the Device for Connecting Networks with Different Models

Based on the functions described, the device specifically designed to connect networks that may work on different networking models, potentially requiring protocol translation or complex address mapping, is the gateway. While a router connects different IP networks, a gateway is broader and can connect networks using entirely different communication architectures or protocols, acting as a bridge between them.

Consider the distinct roles:

Device Primary Function OSI Layer(s) Connects Handles Different Networking Models?
Router Connects networks (often same protocol) Layer 3 Different IP Networks No (typically same IP model)
Switch Connects devices within a network Layer 2 Devices on Same Network No
Gateway Connects different networks (potentially different protocols/models) Various (often higher layers) Different Networks (potentially different protocols/models) Yes (by translating/converting)
Hub Connects devices (broadcasts) Layer 1 Devices on Same Network Segment No

The definition provided in the question perfectly describes the role of a gateway: a passage connecting two networks that may work on different networking models.

Conclusion

The device that serves as a passage to connect two networks that may work on different networking models is a gateway.

Revision Table: Networking Connectivity Devices

Device Type Key Capability Example Use Case
Gateway Connects networks with different protocols/models Connecting a LAN to the internet; connecting different corporate networks with varying protocols.
Router Routes traffic between different IP networks Connecting home network to ISP; connecting different subnets within an organization.
Switch Connects devices within a LAN Connecting multiple computers/printers in an office.
Hub Connects devices (broadcasts all traffic) Older technology for connecting devices in a simple LAN segment (largely replaced by switches).

Additional Information: Gateway Functions and Network Models

A gateway can perform various functions beyond just connecting networks. It might:

  • Translate data formats.
  • Convert protocols (e.g., connecting a TCP/IP network to a network using a different protocol suite).
  • Perform address translation.
  • Act as a proxy server or firewall.

The term "networking models" can refer to different protocol suites (like TCP/IP vs. older systems) or even different network architectures. A gateway's ability to bridge these differences is its defining characteristic compared to routers or switches, which typically operate within a more uniform network environment.

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