多項選擇題What are three characteristics of the OSPF routing protocol? （）

A.It converges quickly.
B.OSPF is a classful routing protocol.
C.It uses cost to determine the best route.
D.It uses the DUAL algorithm to determine the best route.
E.OSPF routers send the complete routing table to all directly attached routers.
F.OSPF routers discover neighbors before exchanging routing information.


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1.單項選擇題A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560. Another route is from OSPF with a metric of 782.The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table?（）

A.Router R2 will not form a neighbor relationship with R1.
B.Router R2 will obtain a full routing table, including a default route, from R1.
C.R2 will obtain OSPF updates from R1, but will not obtain a default route from R1.
D.R2 will not have a route for the directly connected serial network, but all other directly connected

4.多項選擇題Which two subnetworks would be included in the summarized address of 172.31.80.0 /20? （）

A.172.31.17.4 /30
B.172.31.51.16 /30
C.172.31.64.0 /18
D.172.31.80.0 /22
E.172.31.92.0 /22
F.172.31.192.0 /18

5.單項選擇題Which command can you use to manually assign a static IPV6 address to a router interface？（）

A.ipv6 address PREFIX_1：：1/64
B.ipv6 autoconfig 2001：db8：2222：7272：：72/64
C.ipv6 autoconfig
D.ipv6 address 2001：db8：2222：7272：：72/64