Which two options describe the main purpose of EIGRP authentication? (Choose two.)
EIGRP (Enhanced Interior Gateway Routing Protocol) is a Cisco proprietary routing protocol that is commonly used in large enterprise networks. EIGRP authentication is a feature that provides a mechanism to secure EIGRP routing updates.
The main purpose of EIGRP authentication is to identify authorized peers and prevent unauthorized devices from injecting incorrect routing information into the network. EIGRP authentication helps to ensure the authenticity and integrity of routing updates exchanged between EIGRP routers.
Answer A is correct. EIGRP authentication provides a means to identify authorized EIGRP peers. This is accomplished by configuring a shared secret key on each router. When EIGRP routers exchange routing updates, they include the authentication key in the packet. If the authentication key does not match, the router will drop the packet, and the routing update will not be processed.
Answer D is also correct. EIGRP authentication helps to prevent the injection of incorrect routing information into the network. Without authentication, a malicious user could inject false routing information into the network, causing network outages, routing loops, or other problems. By configuring authentication, EIGRP routers can verify the authenticity and integrity of routing updates, and prevent unauthorized changes to the routing table.
Answer B is incorrect. EIGRP authentication does not directly affect the convergence time of the network. While it may add some overhead to the routing updates, the benefits of securing the network outweigh the small increase in convergence time.
Answer C is incorrect. EIGRP authentication does not provide redundancy in the network. Redundancy is achieved by configuring multiple paths between devices, using techniques such as link aggregation, or configuring redundant routers.
Answer E is incorrect. EIGRP authentication does not provide confidentiality of routing updates. Confidentiality is achieved by encrypting the routing updates using protocols such as IPSec.
In summary, the main purposes of EIGRP authentication are to identify authorized peers and prevent the injection of incorrect routing information. By providing a mechanism for secure routing updates, EIGRP authentication helps to ensure the integrity and stability of the network.