In the network shown in the figure, the default next hop of RTA is RTC, and the PBR configuration is as follows:
polic-based-route pbr_a permit node 10
if-match acl 3000
appldefault output-interface serial 2/0
polic-based-route pbr_a dennode 20
According to the above configuration, how will the data stream matching Acl 3000 on RTA be forwarded?

In the IS-IS network as shown in the figure, when the route is stable, shut down the interface where the IP address 192.168.24.1 on the RTB is located. Then IS-IS topology ______, IP routing information ______.

In the IS-IS network as shown in the figure, after the routes of each router are stable, there are ______ IS-IS Level-1 routes learned by RTC through neighbors.

______ Use the shortest path first (SPF) algorithm.

L is a network design engineer. In a certain network project, in order to reduce the complexity, the small L design network adopts a two-layer architecture, and the access layer functions are incorporated into the convergence layer. In the design, the small L takes into account that the core layer needs to have a fast convergence function, and the convergence layer performs route aggregation to reduce the number of routes. Among the following routing protocols, which one should be used by Little L as the core layer routing protocol? (Choose one or more)