In the routing table of a Cisco router, which code represents routes learned through a distance-vector protocol proprietary to Cisco?
D
R
O
E
In Cisco routing tables, the code 'D' indicates routes learned via the Enhanced Interior Gateway Routing Protocol (EIGRP), which is a distance-vector protocol developed by Cisco. The code 'O' represents routes learned through Open Shortest Path First (OSPF), a link-state protocol. 'R' stands for routes learned via the Routing Information Protocol (RIP), a distance-vector protocol but not proprietary to Cisco. 'E' represents routes learned via the Exterior Gateway Protocol (EGP), which is largely obsolete. Recognizing these codes helps in understanding the origin of routing information.
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