In networking, protocols play a vital role in the communication between devices. Two commonly used protocols are Exterior Gateway Protocol (EGP) and Interior Gateway Protocol (IGP). Both protocols are aimed at enabling communication between devices in a network, although there are some differences between them.
EGP, as the name suggests, is designed to exchange routing information between networks. It is commonly used in large enterprise networks where there are multiple routers in different locations. EGP is a path-vector routing protocol that primarily uses Border Gateway Protocol (BGP) to communicate with other routers. It is ideal for networks that span multiple autonomous systems, since EGP allows exchange of routing information between these systems.
IGP, on the other hand, is designed to exchange routing information within a network. It is used in smaller networks where there is a single router or a limited number of routers. IGP is further divided into two protocols: Routing Information Protocol (RIP) and Open Shortest Path First (OSPF). RIP is a distance-vector protocol, while OSPF is a link-state protocol. IGP is best suited for smaller networks with fewer routers, since it enables easy routing information exchange between routers.
When it comes to choosing between EGP and IGP, there are several factors that network administrators need to consider. One key factor is the size of the network. For large enterprise networks with multiple routers in different locations, EGP is the best option since it allows easy exchange of routing information between different autonomous systems. On the other hand, for smaller networks with fewer routers, IGP is the preferred option since it enables easy internal routing information exchange.
Another factor to consider is the complexity of the network. EGP is usually more complex than IGP, especially when it comes to configuring BGP, which is the primary protocol used in EGP. As a result, the setup and maintenance of EGP networks require a high level of skill and experience, making it less suitable for smaller networks. IGP, on the other hand, is much simpler and requires less configuration, making it more suitable for smaller networks.
In terms of security, both EGP and IGP have their advantages and disadvantages. EGP is considered more secure since it allows network administrators to manage routing between different autonomous systems, thus preventing unauthorized access to sensitive information. IGP, on the other hand, is less secure since routing information is only exchanged within a single network.
In conclusion, when choosing between EGP and IGP, it is essential to consider factors such as the size and complexity of the network and the level of security required. For large enterprise networks with multiple autonomous systems, EGP is the best option since it allows easy exchange of routing information between different systems. For smaller networks with fewer routers, IGP is the preferred option since it enables easy internal routing information exchange. Nonetheless, network administrators should evaluate their network architecture and needs before selecting any particular protocol.