BGP stands for Border Gateway Protocol, and it is the standard protocol for exchanging routing information between different autonomous systems (AS) on the internet12. An AS is a network or a group of networks under a single administrative control, such as an ISP or a large enterprise12.
BGP is an Exterior Gateway Protocol (EGP), which means it is used to communicate with routers outside the local network or AS12. BGP allows each AS to advertise its own routes and policies to other ASes, and to learn the best routes to reach any destination on the internet12.
BGP is generally used by major ISPs for handling large-scale internet traffic because it is highly scalable, flexible, and reliable12. BGP can handle millions of routes and thousands of ASes, and it can support various routing policies and preferences12. BGP also has mechanisms to detect and avoid routing loops, and to recover from network failures12.
The other options are not suitable for handling large-scale internet traffic across different ASes. RIP (Routing Information Protocol) and EIGRP (Enhanced Interior Gateway Routing Protocol) are both Distance Vector protocols, which means they use the number of hops as the metric to find the best route34. They are also Interior Gateway Protocols (IGP), which means they are used to communicate with routers within the same network or AS34. RIP and EIGRP are not scalable or flexible enough to handle the complexity and diversity of the internet34. OSPF (Open Shortest Path First) is a Link State protocol, which means it uses the speed and cost of the links as the metric to find the best route5. It is also an IGP, which means it is used to communicate with routers within the same network or AS5. OSPF is more scalable and flexible than RIP and EIGRP, but it still has limitations in handling large-scale internet traffic across different ASes5. References:
1: CompTIA Network+ N10-008 Certification Study Guide, Chapter 3: Routing, Section 3.4: BGP6
2: Professor Messer’s CompTIA N10-008 Network+ Course Notes, Page 18: BGP7
3: CompTIA Network+ N10-008 Certification Study Guide, Chapter 3: Routing, Section 3.2: RIP and EIGRP6
4: Professor Messer’s CompTIA N10-008 Network+ Course Notes, Page 16: RIP and EIGRP7
5: CompTIA Network+ N10-008 Certification Study Guide, Chapter 3: Routing, Section 3.3: OSPF6
6: CompTIA Network+ N10-008 Certification Study Guide2
7: Professor Messer’s CompTIA Network+ N10-008 Training Course5
