多项选择题
A.Each router has an identical link state database.
B.External routes are imported into a separate link state database.
C.Syn chronization of link state databases is maintained via floodingo f LSAs.
D.Information in the link state database is used to build a routing table by calculating a shortest-path tree.
E.By default,link state databases are refreshede very 10 minutes in the absence of topology changes.
单项选择题 Part of the routing table of router PG1 is displayed below: From analyzing the above command output,what is the administrative distance of the external EIGRP routes（）
多项选择题 EIGRP is being used as the routing protocol on the PassGuide network. Whiletroubleshooting some network connectivity issues，you notice a large number of EIGRP SIA（StuckinActive）messages. What causes these SIA routes（）
单项选择题 At which lay er of the OSI model does the Spanning Tree Protocol (STP) operate at（）