JN0-106 Networking Fundamentals Practice Question
Exhibit
Refer to the exhibit.
```
user@mx> show route table inet.0 10.10.10.0/24
inet.0: 15 destinations, 15 routes (15 active, 0 holddown, 0 hidden)
@ = Routing Use Only, # = Forwarding Use Only
+ = Active Route, - = Last Active, * = Both
10.10.10.0/24 *[Static/5] 00:01:23, metric 0
> to 172.16.1.1 via ge-0/0/0.0
```Refer to the exhibit. An engineer adds a new static route to 10.10.10.0/24 via next-hop 172.16.1.2. The new route does not appear in the route table. What is the most likely reason?
⚠ Common exam trap
The trap here is that candidates familiar with Cisco IOS expect static routes to automatically perform recursive next-hop resolution, but Junos requires either a directly connected next-hop or the explicit 'resolve' parameter to install the route.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The next-hop 172.16.1.2 is not directly reachable.
In Junos, a static route's next-hop must be directly reachable (i.e., on a connected subnet) for the route to be installed in the inet.0 route table. If the next-hop 172.16.1.2 is not directly connected, the route remains hidden (inactive) and does not appear in the forwarding table. Junos does not perform recursive next-hop resolution for static routes by default unless configured with 'resolve'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The route requires an export policy to be installed.
Why it's wrong here
In Junos, static routes are always placed into the routing table (e.g., inet.0) as soon as they are configured; there is no need for an export policy to make this local installation happen. Export policies are only required to advertise routes from the routing table into dynamic routing protocols like BGP, OSPF, or IS-IS. Therefore, a missing export policy would not stop the static route from being installed in the local routing table; it would only prevent it from being shared with neighbors.
- ✗
The route has a different AS path.
Why it's wrong here
AS path is a BGP path attribute that records the sequence of autonomous systems a route has traversed; it has no meaning for static routes. A static route is locally originated and does not carry an AS path, so comparing AS paths is irrelevant for its installation. Additionally, the routing table does not use AS path for route preference; it evaluates path selection criteria such as preference and metric, so a different AS path would not be a reason for the route to be missing.
- ✓
The next-hop 172.16.1.2 is not directly reachable.
Why this is correct
When you configure a static route in Junos, the next hop must be resolvable. If the next-hop address (172.16.1.2) is not on a directly connected subnet and there is no existing route in the routing table to reach that address, the static route will be hidden (inactive). Hidden routes still exist in the configuration but are not placed into the active routing table, so they do not appear in show route output unless you use the 'hidden' flag. The route may also be marked as 'unreachable' or 'next-hop-unreachable' in the hidden state.
- ✗
Static routes cannot have the same preference as an existing route.
Why it's wrong here
Juniper devices allow multiple static routes to have the same preference value, and this does not prevent installation. When two routes have the same prefix and same preference, the device uses a tie-breaking sequence (like lowest metric, then oldest, then from a device with lower router ID) to select the active route. The losing route remains in the routing table as an inactive route, but it is still installed. So the real issue is not that preferences cannot match, but that another route for the same prefix with a better preference may be preferred instead.
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