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300-410 · Question #96

You need to resolve a route-selection problem in a redistributed network by increasing the administrative distance to several networks for a protocol, other than EIGRP or BGP, so that these routes…

The correct answer is C. Router(config-router)# distance 220 0.0.0.0 255.255.255.255 5. The distance command within routing protocol configuration mode is used to modify the administrative distance for routes, optionally filtered by an access list.

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Question

You need to resolve a route-selection problem in a redistributed network by increasing the administrative distance to several networks for a protocol, other than EIGRP or BGP, so that these routes will not be used. You create access list 5 to identify the relevant networks, and access the routing protocol configuration prompt. Which command will set the administrative distance to these networks to 220 for the selected protocol?

Exhibit

300-410 question #96 exhibit

Options

  • ARouter(config-router)# ip list 5 distance 220
  • BRouter(config-router)# admin 220 access-list 5
  • CRouter(config-router)# distance 220 0.0.0.0 255.255.255.255 5
  • DRouter(config-router)# increase 0.0.0.0 255.255.255.255 admin 220 list 5

How the community answered

(24 responses)
  • A
    8% (2)
  • C
    88% (21)
  • D
    4% (1)

Why each option

The `distance` command within routing protocol configuration mode is used to modify the administrative distance for routes, optionally filtered by an access list.

ARouter(config-router)# ip list 5 distance 220

The syntax `ip list 5 distance 220` is incorrect for setting administrative distance within routing protocol configuration.

BRouter(config-router)# admin 220 access-list 5

The syntax `admin 220 access-list 5` is incorrect and does not follow the standard Cisco IOS command structure for modifying administrative distance.

CRouter(config-router)# distance 220 0.0.0.0 255.255.255.255 5Correct

The `distance` command with `distance <AD> <source-ip> <wildcard-mask> <ACL-number>` syntax sets the administrative distance for routes learned from a specific source, optionally matching an access list. In this case, `distance 220 0.0.0.0 255.255.255.255 5` applies the AD of 220 to routes matching access list 5, regardless of their source IP, effectively increasing their AD to prevent their selection.

DRouter(config-router)# increase 0.0.0.0 255.255.255.255 admin 220 list 5

The `increase` keyword is not used in this context to modify administrative distance, and the syntax is incorrect.

Concept tested: Modifying administrative distance with ACLs

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_rip/configuration/15-mt/irr-15-mt-book/rip-cfg.html

Topics

#Administrative Distance#Route Manipulation#Access Lists#Routing Protocol Configuration

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