JNCIE BGP and Routing Policy Troubleshooting

1. What does 'show route protocol bgp extensive' display that standard output omits?

Neighbor AS numbers

Route attributes and validation state

Policy chain history

BGP timer values

2. In policy troubleshooting, what does a 'policy statistics' counter of zero indicate?

Policy is functioning correctly

Policy has never been evaluated

Policy has rejected all routes

Policy syntax is invalid

3. Which command shows the effective policies applied to a BGP session?

Show bgp neighbor

Show bgp summary

Show policy

Show route-options

4. What is the purpose of the 'prefix-list' in BGP routing policies?

Define range of acceptable prefixes

List all advertised routes

Specify neighbor addresses

Configure route refresh rates

5. Which BGP attribute cannot be modified by routing policies in Juniper?

AS path

Local preference

MED

Community

6. How do you verify if a route is being rejected by an import policy?

Check 'show route receive-protocol bgp'

Use 'show policy statistics'

Review 'show bgp neighbor received-routes'

Check 'show interfaces terse'

7. What does the 'community' statement do in a routing policy's 'then' clause?

Filters routes by community

Adds or removes community tags

Displays community values

Validates community syntax

8. Which policy action modifies a route's local preference value?

Preference

Local-preference

Set local-preference

Modify preference

9. What is the correct order of BGP path selection criteria in Juniper?

Preference, AS path, origin, MED, IGP

AS path, preference, MED, origin, IGP

Preference, origin, AS path, MED, IGP

MED, preference, AS path, origin, IGP

10. In BGP, which metric is used for path selection when routes originate from the same AS?

MED

IGP metric

AS path length

Origin code

11. Which BGP attribute has the highest default preference value in Juniper devices?

Local preference

AS path length

MED (Multi-Exit Discriminator)

IGP metric

12. Which statement in a routing policy prevents further policy evaluation?

Accept

Reject

Next policy

Return

13. How does local preference affect route selection in IBGP?

It overrides AS path length

It determines the backup route

It has no effect on route selection

It only affects external routes

14. What is the primary purpose of BGP communities in routing policies?

Reduce convergence time

Tag routes for policy application

Increase route stability

Improve neighbor relationships

15. Which command troubleshoots why a route is not being exported to a BGP neighbor?

Show route advertising-protocol bgp

Show bgp neighbor

Show policy statistics

Show route export-policy

16. In policy evaluation, what does 'from' statement match against?

Route destination only

Route attributes and protocol

Neighbor address only

BGP community values only

17. Which BGP path attribute determines the order of preference when all other attributes are equal?

Origin

Originator ID

Cluster list

Router ID

18. What is the default behavior when no routing policy is applied to BGP imports?

All routes are rejected

All routes are accepted

Routes are filtered by prefix length

Routes require explicit approval

19. Which command displays the BGP routing table before policy application?

Show route protocol bgp

Show route receive-protocol bgp