[多选] If the OSPF protocol is used to connect customer edge （CE） routers to service provider edge（PE） routers in the VPN backbone， which two options best describe the use of SHAM links？（）

A . A sham-link is created between any twoo VPN sites that belong to the same OSPF area and share an OSPF backdoor link
B . A sham-link is seen as an intra-area link between PE routers，an OSPF adjacency is created and data base is exchanged
C . A SHAM link is created between two directly connected PE routers so that it is preferred over the low speed backdoor door
D . A SHAM link is part of OSPF network of MPLS-VPN provider

公示催告沉积岩层假整合接触时，上下两套岩层，呈（）接触关系。角度。波浪。平行。倾斜。信用度量组合模型水泥的标号，是将水泥用标准规定方法制成标准试样，在标准条件下养护后进行抗压、抗折强度实验等中（）天的抗压强度数值，即为水泥标号。 3。 7。 28。 8。根据弗莱堡学派的观点，中央银行货币政策的目标应该是（）。经济增长。充分就业。稳定货币。国际收支平衡。 If the OSPF protocol is used to connect customer edge （CE） routers to service provider edge（PE） routers in the VPN backbone， which two options best describe the use of SHAM links？（）

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[多选] If the OSPF protocol is used to connect customer edge （CE） routers to service provider edge（PE） routers in the VPN backbone， which two options best describe the use of SHAM links？（）

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