The Preferred Source of Routing Information

C

By default, Junos OS prefers routing information from the most specific source available in the following order of preference:

1. Directly connected interfaces
2. Static routes
3. OSPF routes
4. IS-IS routes
5. RIP routes
6. BGP routes

Therefore, the correct answer to this question is C. Direct.

Directly connected interfaces are preferred over static routes because they represent the most accurate and up-to-date information about the network topology. Static routes are preferred over dynamic routing protocols like RIP and BGP because they are manually configured by the network administrator and are therefore more reliable and predictable.

BGP is the least preferred source of routing information by default because it is typically used for inter-domain routing on the Internet, where there are many different autonomous systems with their own routing policies. In a single-domain network, BGP is usually only used for connecting to external networks or for policy-based routing.

It's worth noting that the preference order can be changed using the "preference" statement in routing policy or by setting a preference value for a specific protocol using the "preference" configuration option.