Route Preference

Question 1

What is route preference in Junos OS?

Answer 1

Route preference is a value used to determine the preferred route when multiple routes to the same destination exist. The lower the preference value, the higher the preference for the route.

Question 2

What is the default route preference for a static route in Junos OS?

Answer 2

The default route preference for a static route in Junos OS is 5.

Question 3

How does the route preference affect routing decisions in Junos OS?

Answer 3

When multiple routes exist to the same destination, Junos OS chooses the route with the lowest route preference value.

Question 4

How can you change the preference of a static route in Junos OS?

Answer 4

You can change the preference by using the command: set routing-options static route <destination> next-hop <next-hop> preference <preference-value>.</preference-value></next-hop></destination>

Question 5

What is the default route preference for OSPF routes in Junos OS?

Answer 5

The default route preference for OSPF routes is 10 in Junos OS.

Question 6

What route preference value is typically used for BGP routes in Junos OS?

Answer 6

The default route preference for BGP routes is 170 in Junos OS.

Question 7

How can you display the route preference for a specific route in the routing table?

Answer 7

You can display the route preference using the command: show route <destination> detail.</destination>

Question 8

What is the purpose of setting route preferences for routing protocols in Junos OS?

Answer 8

Setting route preferences allows network administrators to control which routing protocol’s routes are preferred when there are multiple valid routes to the same destination.

Question 9

Can route preferences be used to control traffic flow between routing protocols?

Answer 9

Yes, route preferences can be used to control the selection of routes between different routing protocols, ensuring traffic follows the preferred path.

Question 10

How do route preferences interact with administrative distance in Junos OS?

Answer 10

Route preferences are similar to administrative distance, where a lower preference indicates a preferred route. They help determine which route to select when multiple protocols provide routes to the same destination.