In BGP routing optimization, for the following four attributes, the order of consideration by the system is _______.
1. MED
2. Orign
3. As-path
4. Local preference

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

The RIP protocol is enabled on a router with a priority of 10; the OSPF protocol is also enabled with a priority of 100. If two protocols have learned the route 10.0.0.0/8 at the same time, the metric values are 1 (hop count) and 100 (cost value), and the next hop is 1.0.0.1 and 1.0.0.2 respectively.
After the router receives a packet with a destination address of 10.0.0.1, how to deal with it?

In the network shown in the figure, the adjacency relationship between the routers is established normally, and there is no configured route leakage. Then RTA will forward the IP packet whose destination is 16.224.3.20 to ________.

There is definitely no ______ type LSA in the OSPF stub area.