You are modifying the default route preference under the [edit protocols] hierarchy. In which two routing information sources can you change the default preference value?（）

单项选择题Which protocol creates a complete database of the network topology prior to calculating the optimal route?（）

A.BGP
B.PIM
C.OSPF
D.RIP

单项选择题Which directory does the Junos OS use to store syslog information by default?（）

A. A/ar/messages
B. A/ar/syslog
C. /var/tmp
D. /var/log

单项选择题Which command do you use to navigate to [edit interfaces]?（）

A. cd interfaces
B. dir edit interfaces
C. edit interfaces
D. interfaces

单项选择题What is an advantage of dynamic routing?（）

A. Unlike static routing, dynamic routing provides redundant IP addresses for end-user devices
B. Unlike static routing, dynamic routing requires no initial user configuration
C. Dynamic routing can provide increased network availability when compared to static routing
D. Dynamic routing provides DNS services along with IP connectivity; static routing does not

单项选择题In the MAC address 00:90:69:9f.ea:46, what represents the Organizationally Unique Identifier (OUI)?（）

A. 69:9f.ea:46
B. 00:90:69:9f
C. 9f:ea:46
D. 00:90:69