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Difficulty: Very hardRouting Table Components

An network engineer is analyzing various IPv4 routing table entries on a Cisco IOS-XE router. Match each routing table code or bracketed component on the left with its correct operational description on the right.

  • Bracketed notation [120/4] in an entry starting with 'R'Specifies a RIP-learned route possessing an Administrative Distance of 120 and a hop-count metric of 4.
  • Bracketed notation [170/2578560] in an entry starting with 'D EX'Denotes an External EIGRP route with an Administrative Distance of 170 and a composite metric calculated using bandwidth and delay.
  • Prefix source code and symbol 'S*'Designates a statically configured candidate default route that functions as the Gateway of Last Resort.
  • Prefix source code 'C'Identifies a directly connected network with an Administrative Distance of 0, requiring no next-hop IPv4 address.

Answer

Bracketed notation [120/4] matches the RIP route description with AD 120 and metric 4. Bracketed notation [170/2578560] matches the External EIGRP route with AD 170 and composite metric. Code 'S*' matches the static candidate default route. Code 'C' matches the directly connected network with AD 0.
Each matching pair correctly identifies the Cisco IOS routing table syntax: bracketed notation [AD/Metric], protocol codes ('C' for connected, 'S' for static, 'D EX' for external EIGRP, 'R' for RIP), and special flags such as '*' for candidate default routes.

Step-by-Step Solution

1
Analyze bracketed notation format [AD/Metric]
Identify that the first integer inside brackets is Administrative Distance (trustworthiness) and the second integer is the routing protocol metric (cost).
Cisco IOS routing tables consistently structure route preference metrics as [Administrative Distance / Metric].
2
Evaluate protocol code 'R' and bracket [120/4]
Match with RIP protocol attributes (AD 120, hop count metric 4).
RIP routes use AD 120 and measure metric in hop counts.
3
Evaluate protocol code 'D EX' and bracket [170/2578560]
Match with External EIGRP route attributes.
Internal EIGRP uses AD 90, but external redistributed EIGRP routes ('D EX') use AD 170 and 32-bit composite metric values.
4
Evaluate static default indicator 'S*'
Match with static candidate default route.
'S' stands for static and '*' designates candidate default.
5
Evaluate connected code 'C'
Match with directly connected interface route (AD 0).
'C' represents connected routes directly assigned to router interfaces.

Key Concept

Routing Table Components and Administrative Distance
Estimated Time:2m 0s
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Topics

Routing Table Components

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