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Exam JN0-633 topic 1 question 89 discussion

Actual exam question from Juniper's JN0-633
Question #: 89
Topic #: 1
[All JN0-633 Questions]

Click the Exhibit button.
-- Exhibit --
[edit]
user@srx# run show route
inet.0: 10 destinations, 10 routes (10 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
0.0.0.0/0 *[Static/5] 01:09:08
> to 172.18.1.1 via ge-0/0/3.0
10.210.14.128/27 *[Direct/0] 8w6d 15:43:09
> via ge-0/0/0.0
10.210.14.135/32 *[Local/0] 11w0d 06:43:04

Local via ge-0/0/0.0 -
172.18.1.0/30 *[Direct/0] 8w6d 15:43:01
> via ge-0/0/3.0
172.18.1.2/32 *[Local/0] 11w0d 06:43:03

Local via ge-0/0/3.0 -
172.19.1.0/24 *[Direct/0] 03:46:56
> via ge-0/0/1.0
172.19.1.1/32 *[Local/0] 03:46:56

Local via ge-0/0/1.0 -
172.20.105.0/24 *[Direct/0] 03:46:56
> via ge-0/0/4.105
172.20.105.1/32 *[Local/0] 03:46:56

Local via ge-0/0/4.105 -
192.168.30.1/32 *[Direct/0] 4d 03:44:41
> via lo0.0
fbf.inet.0: 2 destinations, 2 routes (2 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
0.0.0.0/0 *[Static/5] 00:00:11
> to 172.19.1.2 via ge-0/0/1.0
172.19.1.0/24 *[Direct/0] 00:00:11
> via ge-0/0/1.0
[edit]
user@srx# show routing-instances
fbf {
routing-options {
static {
route 0.0.0.0/0 next-hop 172.19.1.2;
}
}
}
[edit]
user@srx# show routing-options
interface-routes {
rib-group inet fbf-int;
}
static {
route 0.0.0.0/0 next-hop 172.18.1.1;
}
rib-groups {
fbf-int {
import-rib [ inet.0 fbf.inet.0 ];
import-policy fbf-pol;
}
}
[edit]
user@srx# show policy-options policy-statement fbf-pol
term 1 {
from interface ge-0/0/1.0;
to rib fbf.inet.0;
then accept;
}
term 2 {
then reject;
}
-- Exhibit --
Referring to the exhibit, you notice that filter-based forwarding is not working.
What is the reason for this behavior?

  • A. The RIB group is configured incorrectly.
  • B. The routing policy is configured incorrectly.
  • C. The routing instance is configured incorrectly.
  • D. The default static routes are configured incorrectly.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
By default, we have a static route in a routing instance sending the default route to 172.19.1.2. We want to hijack traffic matching a particular filter and send the traffic to a different next-hop, 172.18.1.1. Weshould create your rib group by importing FIRST the table belonging to your virtual router and SECOND the table for the forwarding instance that has the next-hop specified.
Reference: http://kb.juniper.net/InfoCenter/index?page=content&id=KB17223

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