200-301 Question 268
Select 4A network engineer is troubleshooting a routing issue and notices the following output from the routing table on a Cisco router:
C 192.168.1.0/24 is directly connected, GigabitEthernet0/1
O 10.10.10.0/24 [110/2] via 10.10.10.2, 00:00:05, GigabitEthernet0/2
D 172.16.0.0/16 [90/30720] via 172.16.0.1, 00:00:55, GigabitEthernet0/3
S 192.168.2.0/24 [1/0] via 192.168.1.1
Based on the routing protocol codes shown in this table, which of the following statements are correct?
- A
The code 'C' indicates that the route is directly connected to the router.
- B
The code 'O' indicates the route is learned via the OSPF routing protocol.
- C
The code 'D' represents a route learned through the EIGRP routing protocol.
- D
The code 'S' indicates a statically configured route.
- E
The code 'O' indicates a route learned through the RIP protocol.
Show answer and explanation
Correct answers: A, B, C, D
Explanation
Routing tables use specific protocol codes to indicate how routes are learned. 'C' represents directly connected routes, 'O' represents OSPF, 'D' represents EIGRP, and 'S' represents statically configured routes. Understanding these codes is essential for interpreting routing table entries and troubleshooting network issues effectively.
- A. Correct.
Correct. The code 'C' in the routing table signifies that the route is directly connected to the router's interface.
- B. Correct.
Correct. The code 'O' in the routing table represents routes learned via the OSPF (Open Shortest Path First) protocol.
- C. Correct.
Correct. The code 'D' corresponds to routes learned through the EIGRP (Enhanced Interior Gateway Routing Protocol).
- D. Correct.
Correct. The code 'S' indicates that the route was manually configured as a static route.
- E. Incorrect.
Incorrect. The code 'O' is associated with OSPF, not RIP. The code for RIP is 'R'.