Two empty-configured MSR routers are interconnected back-to-back through their respective GE0/0 interfaces, and their interconnection network segment is 192.168.1.0/30. After the IP addresses are correctly configured, the GE0/0 interfaces of the two routers can communicate with each other. Now the following OSPF configurations are added to the two routers:
ospf 1
area 0.0.0.1
network 192.168.1.0 0.0.0.3
So which of the following statements are correct?

• A.An OSPF route will appear in the RTA routing table
• B.No Router ID is configured, and a stable OSPF adjacency relationship cannot be established between the two routers
• C.A stable OSPF adjacency relationship can be established between the two routers, but there is no OSPF route in the routing tables of RTA and RTB
• D.Area 0 is not configured, and a stable OSPF adjacency relationship cannot be established between the two routers

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The correct statement below is ______. (Multiple choice)

• A.DTE (Data Terminal Equipment, data terminal equipment) equipment refers to the equipment located at the user end of the user network interface, it can be used as a source, a sink, or both at the same time. Data terminal equipment is connected to a data network through a data communication device (for example, a modem), and usually uses a clock signal generated by the data communication device. Modems and interface cards are examples of DTE devices. Is an example of a DCE device
• B.DSU (Data Service Unit): refers to a device used in digital transmission, which can adapt the physical layer interface on the DTE device to communication facilities such as T1 or E1. The data service unit is also responsible for signal timing and other functions. It is usually mentioned together with CSU and is called CSU/DSU.
• C.DCE (Data Circuit Terminating Equipment, data communication equipment or data circuit terminal equipment) equipment and its connection with the communication network constitute the user network interface of the network terminal. It provides a physical connection to the network for forwarding traffic, and provides a clock signal for synchronizing data transmission between DCE equipment and DTE equipment.
• D.CSU (Channel Service Unit): A digital interface device that connects end users with the local digital telephone loop. Usually it and DSU are collectively referred to as CSU/DSU. CSU equipment includes computers, protocol translators, and demultiplexers. DTE equipment includes these

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The default subnet mask for class B addresses is ______.

• A.255.255.255.0
• B.None of the above is correct
• C.255.255.0.0
• D.255.0.0.0

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The IPv6 link-local address belongs to the ______ address type.

• A.Unicast
• B.Multicast
• C.Anycast
• D.Broadcast

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Which of the following descriptions of circuit switching and packet switching is correct is ______. (Multiple choice)

• A.Large packet switching delay, poor real-time transmission
• B.The circuit switching delay is small, and the transmission is real-time
• C.High utilization of circuit-switched network resources
• D.Low utilization of packet switching network resources

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