Which of the following statements about CSMA/CD is correct is ______. (Multiple choice)

• A.The station can start transmitting its frame only when the channel is free.
• B.CSMA/CD is applied in bus-type Ethernet, mainly to solve the problem of how to detect conflicts and ensure orderly transmission of data when multiple stations send data at the same time.
• C.If two stations start transmitting at the same time, they will hear the signal conflict and pause the frame transmission.
• D.When a station connected to the Ethernet wants to transmit a frame, it must wait until the channel is free, that is, the carrier disappears.

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In Windows operating system, which command can display ARP table entry information?

• A.display arp
• B.arp -a
• C.show arp
• D.arp -d

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The WAN links of the customer's two routers MSR-1 and MSR-2 use the PPP protocol. At the same time, MSR-1 is required as the main verifier to verify MSR-2 through PAP. Then what configuration is required on MSR-2?

• A.[MSR-2-Serial0/0] ppp pap user user
• B.[MSR-2] ppp pap local-user user password simple password
• C.[MSR-2-Serial0/0] ppp pap password simple password
• D.[MSR-2-Serial0/0] ppp pap local-user user password simple password

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According to the different sources, the routes in the routing table are usually divided into the following categories? (multiple choice)

• A.Dynamic routing
• B.Static routing
• C.Direct route
• D.Interface routing

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After executing the display vlan 2 command on the switch SWA, the switch output is as follows:
<SWA> display vlan 2
VLAN ID: 2
VLAN Type: static
Route interface: not configured
Description: VLAN 0002
Tagged Ports: none
Untagged Ports:
Ethernet1/0/1 Ethernet1/0/3 Ethernet1/0/4
It can be judged from the above output ______. (Multiple choice)

• A.The current VLAN on the switch is only VLAN2 and Vlan1 must exist
• B.Data frames with VLAN2 tags need to be stripped off when they leave port Ethernet1/0/3
• C.VLAN2 contains ports Ethernet1/0/1, Ethernet1/0/3 and Ethernet1/0/4
• D.Port Ethernet1/0/1 is a Trunk port hybrid

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