Two empty-configured MSR routers are directly connected back-to-back through their respective WAN Serial1/0 interfaces, and their interconnection network segment is 192.0.0.0/24.
At the same time, the two routers are connected to their respective LAN segment users through their respective GigabitEthernet0/0:
HostA----GE0/0--MSR-1--S1/0---------S1/0--MSR-2--GE0/0----HostB
Configure RIPv1 on the two routers, and now both routers have learned the RIP route of the opposite LAN segment. So which of the following statements are correct?

• A.If the LAN segment of one of the routers is 10.0.0.0/24, then the routing table of the other router will learn the route of 10.0.0.0/8
• B.RIP packets between two routers are transmitted based on TCP
• C.The way to exchange RIP packets between the two routers is multicast
• D.CHAP authentication can be configured on the WAN interface of the two routers to enhance network security

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Which of the following statements about optical fiber are correct? (multiple choice)

• A.When using multi-mode fiber, the maximum signal transmission distance is longer than single-mode fiber
• B.The cost of multimode fiber is lower than that of single mode fiber
• C.Multimode fiber has a thinner core
• D.Multimode fiber can transmit light of different wavelengths and different incident angles

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It is found in the routing table of an MSR 30 router that the cost value of the route to the destination network segment 61.232.200.253/22 is 16, so the correct description of this route entry is ______. (Multiple choice)

• A.If the route is learned through the RIP protocol, it is possible that the network 61.232.200.253/22 is malfunctioning
• B.If the route is learned through the RIP protocol, then the route may be in a suppressed state
• C.The route may be a static route
• D.The route can only be a dynamic route

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If the data packet matches multiple routing entries in the routing table of the MSR router, the correct description of the order of routing preference is ______.

• A.The smaller the Cost value, the better the route
• B.The shorter the mask, the more preferred the route
• C.The longer the mask, the more preferred the route
• D.The smaller the Preference value, the better the route

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The three MSR routers are connected as shown in the figure. 192.168.1.0/30 is the interconnection network segment between RTA and RTB, and 10.10.10.0/30 is the interconnection network segment between RTB and RTC.

OSPF is running on the interconnection interfaces of the three routers and all belong to Area 0. At the same time, only the three router interconnection interface network segments are published in Area 0.
Assuming that OSPF is operating normally and OSPF neighbors are established successfully, then ______. (Multiple choice)

• A.After the OSPF neighbor status of the three routers is stable, the three routers have the same LSDB
• B.If the links between the three routers are all Ethernet, there may only be one DR in the network
• C.If the links between the three routers are all Ethernet, then there are at least two DRs in the network
• D.There is no OSPF route in the RTB routing table

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