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		How to configure EIGRP authentication to prevent unauthorized access?  * EIGRP (Extended Interior Gateway Routing Protocol) Configuration to Enable EIGRP on Router A In global configuration Mode: A (config# router eigrp 10 (Enable EIGRP protocol and 10 is Autonomous number). A (config-router)# network 30.0.0.0  (Advertised router A Serial Network 30.0.0.0). A (config-router)# network 10.0.0.0  (Advertised router A Ethernet Network 10.0.0.0). Configuration to Enable EIGRP on Router B In global configuration Mode: B (config) # router eigrp 10  (Enable EIGRP protocol and 10 is Autonomous number) B (config-router) # network 30.0.0.0  (Advertised router B Serial Network 30.0.0.0). B (config-router) # network 15.0.0.0 (Advertised router B Ethernet Network 15.0.0.0). Now Configure EIGRP Authentication on Router A In global configuration Mode:  First create the key chain with the name cisco used in this example.  A (config) # key chain cisco  Now set the key number 1 used in this example.  A (config-keychain) # key 1  Now set the key string for the key name champion used in this example. A (config-keychain-key) # key-string champion A (config-keychain-key) # end Now specify the interface that you want to configure EIGRP message authentication. A (config) # interface serial 0 A (config-if) # ip authentication key-chain eigrp 1 cisco A (config-if) # ip authentication mode eigrp 1 md 5 A (config-if) # end  Now Configure EIGRP Authentication on Router B n global configuration Mode:  First create the key chain with the name cisco used in this example.  B (config) # key chain cisco Now set the key number 1 used in this example. B (config-keychain) # key 1 Now set the key string for the key name champion used in this example. B (config-keychain-key) # key-string champion  B (config-keychain-key) # end  Now specify the interface that you want to configure EIGRP message authentication. B (config) # interface serial 0 B (config-if) # ip authentication key-chain eigrp 1 cisco B (config-if) # ip authentication mode eigrp 1 md 5 B (config-if) # end   Yesterday Tip. How to prevent users from writing to USB drives?