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Exterior Gateway Protocol

Definition of Exterior Gateway Protocol

Exterior Gateway Protocol (EGP) is a routing protocol used by routers to exchange routing information between different autonomous systems (AS) ā€“ networks that are under a single administrative domain. In simpler terms, it's a set of rules that allow routers in different organizations or networks to communicate and share information about the best paths for data to travel across the internet.

Origin of Exterior Gateway Protocol

EGP has its roots in the early days of the internet, dating back to the ARPANET era of the 1970s. Originally developed by the Advanced Research Projects Agency (ARPA), EGP was one of the first protocols designed to facilitate inter-network communication. Over time, it has evolved and been refined to meet the changing needs of the expanding internet infrastructure.

Practical Application of Exterior Gateway Protocol

One practical application of EGP is in connecting disparate networks operated by different organizations. For example, when a user in one company accesses a website hosted on servers located in another company's network, EGP helps ensure that data packets are routed efficiently and securely between the two networks. This seamless exchange of information is essential for maintaining a robust and interconnected internet.

Benefits of Exterior Gateway Protocol

EGP offers several key benefits:

Scalability: EGP enables networks to scale efficiently by providing a standardized method for routing data between autonomous systems. This scalability is crucial as the internet continues to grow and evolve.

Fault Tolerance: By allowing routers to dynamically adapt to changes in network topology, EGP helps ensure that data can still be routed even in the event of network failures or outages.

Security: EGP supports authentication mechanisms that help verify the legitimacy of routing updates, reducing the risk of malicious attacks or unauthorized access to network infrastructure.

Performance Optimization: By selecting the most efficient paths for data transmission, EGP helps minimize latency and optimize network performance, resulting in faster and more reliable communication.


No, while EGP played a significant role in the early development of the internet, it has largely been replaced by more advanced protocols such as Border Gateway Protocol (BGP), which is now the primary routing protocol used on the internet.

No, EGP is specifically designed for routing between autonomous systems. Within a single AS, interior gateway protocols (IGPs) such as OSPF or IS-IS are typically used.

EGP routers use various metrics and algorithms to select the best paths for data transmission, taking into account factors such as available bandwidth and network congestion levels. This helps minimize congestion and ensures efficient use of network resources.


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