單項選擇題What is the default administrative distance of OSPF?()

A. 120
B. 100
C. 90
D. 110


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2.單項選擇題Which statement is true, as relates to classful or classless routing?()

A. Automatic summarization at classful boundries can cause problems on discontinuous subnets
B. EIGRP and OSPF are classful routing protocols and summarize routes by default
C. RIPv1 and OSPF are classless routing protocols
D. Classful routing protocols send the subnet mask in routing updates

3.單項選擇題Which device might be installed at a branch office to enable and manage an IPsec site-to-site VPN?()

A. Cisco IOS IPsec/SSL VPN client
B. Cisco VPN Clinet
C. ISDN terminal adapter
D. Cisco Adaptive Security Appliance

4.單項選擇題At which layer of the OSI model is RSTP used to prevent loops?()

A. data link
B. network
C. physical
D. transport