The network delay (delay) defines the time required for the network to transmit data from one network node to another network node. Network latency includes ______. (Multiple choice)

• A.propagation delay (propagation delay)
• B.media access delay (access delay)
• C.switching delay (switching delay)
• D.queuing delay

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A routing protocol is a link state routing protocol, then which of the following characteristics should this routing protocol have? (multiple choice)

• A.The routing protocol periodically sends update messages to exchange routing tables
• B.The router running the routing protocol will form a weighted directed graph containing each destination network segment according to the collected link state information
• C.This routing protocol cares about the status of links or interfaces in the network
• D.The routing protocol algorithm can effectively prevent loops

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802.1x defines the port-based network access control protocol, and only defines the point-to-point connection between the access device and the access port. The access port can only be a physical port.

• A.error
• B.correct

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The command to configure the interface Ethernet1/0/1 on the switch SWA as an edge port is ______.

• A.[SWA-Ethernet1/0/1] stp edged-port enable
• B.[SWA-Ethernet1/0/1] stp enable edged-port
• C.[SWA] stp edged-port enable
• D.[SWA] stp enable edged-port

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As shown in the figure, four MSR routers are connected via Ethernet and serial interfaces, and OSPF is running in the network at the same time. The area is divided as shown in the figure.

It is known that the OSPF Cost value of all interconnection links is the same, except that the link between RTB and RTC is PPP, the other interconnection links are all Ethernet. So ______ . (Multiple choice)

• A.If the link between RTD and RTC fails, RTD and RTC will immediately send LSA summary information to RTA and RTB without waiting for a fixed LSA update cycle
• B.After the state is stable, the four routers have the same LSDB
• C.There are at least three BDRs in the network
• D.There are at least three DRs in the network

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