It is true that a gateway router must run both an intra-as routing algorithm and an inter-as routing algorithm.
The network layer performs dynamic routing using the Routing Information Protocol (RIP).
A router uses a comparable set of networks to transport different data packets. A gateway serves as a bridge between two networks that are extremely distinct. Only three and four levels are easily operative for a router. A gateway is limited to five tiers of operation.
The gateway transforms data, communications, and information from one protocol or format to another. Some of the duties of a gateway may be carried out by a router. Communications between a corporate network and the Internet can be transferred through an Internet gateway.
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