Computer Network Tutorial

Introduction of Computer Network Types of Computer Network Network Topology Computer Networking Architecture Transmission Modes (Data Flow) Basic Networking Devices Integrate Services Digital Network (ISDN)


OSI Model TCP/IP Model

Physical Layer

Digital Transmission Analog Transmission Transmission Media Switching

Data Link Layer

Error detection and Error correction Data Link Control Multiple Access Aloha

Network Layer

Network Layer - Logical Address Address Mapping Unicast Routing Protocol

Transport Layer

Process to Process Delivery User Datagram Protocol Transmission Control Protocol Stream Control Transmission Protocol Session Layer and Presentation Layer

Application Layer

Domain Name System Application Protocol E-mail Cryptography


Classes of Routing Protocols Classification of Routing Algorithms Controlled Access Protocols in Computer Networks Differences between IPv4 and IPv6 Fixed and Flooding Routing Algorithms Advantages and Disadvantages of Fibre Optics Cable APIPA Difference between Active and Passive FTP Fiber Optics and its Types Method of Joining and Fusion of Fiber Optic Cable Define Framing in Computer Network Disadvantages of Computer Network Mesh Topology Diagram in Computer Network Ring Topology in Computer Network Star Topology in Computer Networks 4G Mobile Communication Technology Advantages and Disadvantages of LAN Advantages and Disadvantages of MAN Advantages and Disadvantages of WAN Application Layer in OSI Model Cyclic Redundancy Check Example Data link layer in OSI model Difference between Transport and Network Layer Hamming Code Example Network Layer in OSI Model Session Layer in OSI Model Transport Layer in OSI Model Two Port Network in Computer Networks Uses of Computer Networks What is Computer Network What is Framing in a Computer Network Advantages and Disadvantages of Bus Topology Difference between Star Topology and Bus Topology Subnetting in Computer Network Subnetting Questions and Answers What is Bus Topology What is Network Topology and Types in Computer Networks Access Control in Networking Basic Characteristics of Computer Network Benefits of SOCKS5 Proxy in Computer Networks Computer Network viva Questions Difference between BOOTP and RARP Difference Between Network Topologies and Network Protocols Difference between NFC and RFID Difference Between Point-to-Point Link and star Topology Network Differences Between MSS and MTU Differences Between Trunk Port and Access Port Different Modes of Communication in Computer Networks MIME Protocol in Computer Networks Modes of Communication in Computer Networks Network Attack in Computer Network Port Address in Networking Simplest Protocol in Computer Network Sliding Window Protocol in Computer Network Stop And Wait Protocol in Computer Networks TCP 3-Way Handshake Process in Computer Networks What is a Proxy Server What is APPN What is ICMP Protocol What is Point-to-Point Protocol What is Port Address in Networking What is the HDLC Protocol What is VRRP Protocol Difference Between Analog and Digital Signals Difference Between Hub and Repeater Difference between Repeater and Switch Difference Between Transparent Bridge and Source Routing Bridge Source Routing Bridge in Computer Networks Transparent Bridge in Computer Networks Transport Protocol in Computer Networks Types of CSMA in Computer Networks What is Wired and Wireless Networking Network Security in Computer Network Disadvantages of Extranet Difference Between TELNET and FTP Define Protocol in Computer Networks Guided Transmission Media in Computer Network What is a Gateway in a Computer Network IGMP in Computer Networks LAN Protocols in Computer Networks MAN Meaning in Computer Modulation Techniques in Computer Networks Switching in DCN TCP/IP Applications What is IGMP? What is Modem in Networking What is Non-Persistent CSMA Difference between Cell Splitting and Cell Sectoring Forouzen Computer Network Open Loop and Closed Loop Congestion Control Types of Cluster Computing WAP-Wireless Access Point What are the elements of the Transport Protocol Difference between Gateway and Switch Flow Control in Data Link Layer Body Area Network Flooding in Computer Network Token Ring in Computer Networks VoIP in Computer Networks What is Infrared Transmission Congestion Control Techniques Forward Error Correction (FEC) Switching Techniques What is Telnet in Computer Network

What is a Gateway in a Computer Network

What is Gateway?

A gateway is a device or hardware that acts as a "gate" between the networks. We can also define it as a node that acts as an entry for other network nodes. It is also responsible for facilitating the traffic flow within the network.

In other words, It is a network node utilized for telecommunications that joins two networks via different transmission protocols and is responsible for converting one protocol into another. The gateways act as a network's entry and exit points because all data must pass through or communicate with them before being routed. Gateway uses multiple communication protocols, making its activities more complicated than a router or switch.

A gateway can be regarded as the most intelligent equipment among the different networks connecting devices in computer networks. Intelligent in the context of function, data packet, error prevention, routing, transmission efficiency, etc. Both software and hardware elements are present in its construction.

The Gateway is a computer device responsible for routing traffic from the primary workstation to the outside network for every workplace form. It is responsible for providing households with access to the Internet, thereby serving as an Internet service provider.

How does Gateway Work?

Each network has a border that only allows electronic devices directly linked to them to communicate with one another. As a result, a network needs the features of a gateway if it wants to communicate with networks, nodes, or devices beyond that barrier. A gateway is frequently described as being made up of a router and a modem.

The Gateway controls all data that is sent from a network, whether it is sent internally or externally. It is implemented at the network's edge. The data packet is delivered to the Gateway when a network wants to interact with another, and it is then routed through the most effective route to the destination. The Gateway will also retain information regarding the internal paths of the host network and the paths of any new networks that are met in addition to the routing data.

In essence, gateways are protocol converters that operate on any layer of the OSI (open systems interconnection)"model and allow interoperability between two protocols.

Kinds of Gateways

Based on data flow, computer networking has two distinct gateways: unidirectional and bidirectional. Let's take a look at a summary of each one.

  1. Unidirectional Gateway: Data can only be transferred in one direction via a unidirectional gateway. You can modify the source terminal, and those changes are replicated, not changed to all the other destination apps or nodes. These gateways work as archiving devices or tools. Software and hardware are both used for creating unidirectional gateways. However, the technology facilitates moving data between source networks; it cannot transfer any kind of data back into the original network. The gateway software instead copies databases while simulating devices and protocol servers.
  2. Bidirectional Gateways: In computer networking, bidirectional gateways facilitate two-way data transfer. They imitate changes performed on the source node to the destination, and inversely, they may finish every task simultaneously. In simple terms, the bidirectional Gateway works as an app or tool for synchronization. In this type of gateway configuration, updates to a source ObjectServer's content are transmitted to a destination ObjectServer, and the latter replicas its alerts to the earlier.


Gateways come in many forms and have many different functions. Some examples of this are:

  • Cloud storage gateways: Storage requests with various cloud storage provider API calls, like REST, SOAP, etc., are translated by cloud storage gateways. It enables businesses to integrate private cloud storage into apps without switching to the public cloud.
  • Web application firewalls: This examines data at the application layer and filters traffic to and from a web server.
  • IoT gateways: These collect sensor data from connected devices, translate it across sensor protocols, and process it before transferring it to another device.
  • VoIP trunk gateways: This type of device enables the use of traditional telephone equipment with a VoIP (voice over IP)"network, including landlines and fax machines.
  • Media gateways: This type transforms data between the formats required by different types of networks.
  • API, XML, or SOA gateways: Gateways that control traffic going into and out of a service, a microservices-oriented architecture, or an XML-based web service are called API, XML, or SOA gateways.
  • Email security gateways: Prevent email transmission that infringes business policy or is intended to transfer sensitive information.

A service provider could additionally develop unique gateways that are accessible to clients. For example, a developer can link non-AWS apps to AWS back-end resources via the Amazon API Gateway provided by Amazon Web Services (AWS).

The Functions of Gateways

In a computer network, a gateway is an electronic device that links the Internet with the LAN. It may also act as a bridge for two distinct networks. A network gateway performs two distinct functions.

  • A LAN-to-WAN functionality links the local area network to the Internet.
  • A WAN-to-LAN functionality links the Internet to a remote local area network.

A gateway initially checks the header data when a data packet is received. Afterwards, it modifies the protocol and the data of the data packet under the needs of the destination network after checking the destination IP and inspecting for any data packet issues. At last, it establishes a particular transmission channel and delivers the data packet to the IP address that is being targeted.

Any telephony system has a gateway, a networking device between the Internet and phone network. It acts as a bridge. Imagine a situation where you wished to arrange a direct call with the client. The client's present location will be determined automatically by your real-time communication gateway, and it also converts audio data"back and forth between various technologies.

A network gateway distinguishes a company's network from the publicly accessible Internet by filtering packets. It is usually used to separate networks to help keep public and local networks secure. Using a method known as NAT, a gateway gives the same security as a firewall.

Characteristics of a Gateway

in a computer network The characteristics of a gateway are vast. Let's study a few of a gateway's important characteristics:

  • Higher visibility: A higher level of visibility can be achieved because of the positioning of network gateways at the network's boundary, which gives users a unique understanding of the traffic going through those points.
  • Information gathering: A network gateway collects information from other network nodes to help analyze and troubleshoot.
  • Highly security: Network gateways are more secure since they are located at the network boundary and act as a key site for security software and firewalls
  • Provides support of multiple protocols: To simplify data transmission between networks utilizing many different protocols, gateways are usually built to accommodate various protocols (protocol translation).

Pros of Gateway in Computer Networking

Let's go over a few benefits of utilizing a gateway in computer"networking:

  • It's far more secure and stronger than any different network connection device.
  • Among many other network-connected devices, it possesses the fastest data transmission speed.
  • Data packets are encapsulated & decapsulated.
  • Control the broadcast and collision domain.
  • Based on the needs of the destination network, it is carrying out protocol conversion and data translation on the data packet.
  • utilizes a full-duplex method of communication
  • data filtering and working as an intelligent computer"device
  • Allows the linking of devices from two different networks using various protocols.

Cons of Gateway in Computer Networking

The usage of a gateway in computer networking has some limitations. So, let's cover some drawbacks:

  • Due to the wide implementation expenses, it is extremely costly.
  • Designing and implementing it is challenging.
  • It needs a specific system administration setup.