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Difficulty: HardRouting Table Components

A network administrator is inspecting the IPv4 routing table on a Cisco IOS XE router using the `show ip route` command. Match each routing table entry line on the left to its corresponding architectural component description on the right.

  • D EX 10.5.0.0/16 [170/2578560] via 192.168.1.2An external EIGRP route redistributed into the autonomous system with an Administrative Distance of 170.
  • O IA 10.2.0.0/24 [110/30] via 172.16.10.1An OSPF inter-area route originated from an Area Border Router (ABR) in a different OSPF area.
  • L 10.1.1.1/32 is directly connected, GigabitEthernet0/0/0A local host route automatically assigned with a 32-bit mask for an active interface IPv4 address.
  • S* 0.0.0.0/0 [1/0] via 192.168.254.1A candidate default static route configured to handle unmatched destination traffic with an Administrative Distance of 1.

Answer

Each routing entry line matches its unique protocol source code and administrative metric: 'D EX' matches external EIGRP (AD 170); 'O IA' matches OSPF inter-area; 'L 10.1.1.1/32' matches the interface local host route; and 'S* 0.0.0.0/0' matches the candidate default static route.
Each entry correctly aligns with its routing protocol source flag and structural component: 'D EX' designates external EIGRP with AD 170; 'O IA' identifies OSPF inter-area routes; 'L' with a /32 mask represents a local interface host route; and 'S*' indicates a static candidate default route.

Step-by-Step Solution

1
Examine the prefix source code flags at the beginning of each routing entry.
Identify 'D EX' as EIGRP external, 'O IA' as OSPF inter-area, 'L' as local host route, and 'S*' as static candidate default route.
Source codes in Cisco IOS show ip route output define how the route was learned or populated into the RIB.
2
Analyze the Administrative Distance (AD) and metric values inside the brackets [AD/metric].
Verify [170/2578560][170/2578560] for external EIGRP, [110/30][110/30] for OSPF, and [1/0][1/0] for static route.
Administrative Distance rates the trustworthiness of routing information sources.
3
Match each entry to its exact functional component definition.
All four entries correlate to their distinct protocol and structural roles.
Direct mapping of Cisco IOS routing table output identifiers to architectural standards.

Key Concept

Cisco IOS Routing Table Components and Protocol Source Codes
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Topics

Routing Table Components

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