An empty MSR router RTA connects two routers RTB and RTC running in OSPF Area 0 through GE0/0 and GE1/0 respectively. The IP addresses of the interfaces GE0/0 and GE1/0 of RTA are 192.168.3.2/24 and 192.168.4.2/24 respectively. Add the following configuration on RTA:
[MSR-ospf-1] area 0.0.0.0
[MSR-ospf-1-area-0.0.0.0]network 192.168.0 0.0.3.255
[MSR-GigabitEthernet0/0]ospf cost 2
[MSR-GigabitEthernet1/0]ospf dr-priority 0
Then the correct description of the above configuration is _____. (Multiple choice)

• A.Modifying the Cost of interface GE0/0 does not affect the establishment of OSPF adjacency
• B.This configuration only enables OSPF on the GE0/0 interface of the MSR router
• C.RTA can only become the DR of the network segment where one of the GE interfaces is located
• D.RTA may become the DR of the network segment where the two GE interfaces are located
• E.This configuration has enabled OSPF on GE0/0 and GE1/0 of the MSR router

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On the MSR router, once the system time is inaccurate, you can use the ______ command to adjust the system time.

• A.clock datetime
• B.time
• C.clock
• D.set datetime

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Compared with traditional LAN, which of the following advantages does VLAN have? (multiple choice)

• A.Reduce the cost of movement and change
• B.Create a virtual working group
• C.Users are not restricted by physical devices, VLAN users can be anywhere in the network
• D.Limit broadcast packets and improve bandwidth utilization
• E.Enhance the security of communication
• F.Enhance the robustness of the network

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Which of the following advantages does the OSI reference model have? (multiple choice)

• A.The OSI reference model provides compatibility and standard interfaces between devices and promotes standardization.
• B.The OSI reference model is a theoretical description of the information transmission process that occurs between network devices, and defines how to implement each layer of functions through hardware and software.
• C.None of the above statements are correct.
• D.An important feature of the OSI reference model is its layered architecture. The layered design method can transform a large and complex problem into several smaller and easy-to-handle problems.

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Which of the following statements about MAC addresses are correct? (multiple choice)

• A.The MAC address is solidified in ROM and cannot be changed under normal circumstances
• B.Ethernet uses MAC address to identify host
• C.Usually only terminal hosts need MAC addresses, routers and other network devices do not need
• D.MAC address is a logical address that is easy to change

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