If the Ethernet data frame is Lengthtype=0x0806, which of the following statement is correct? (Multiple Choice)

• A.The source MAC address of this data frame must not be FFFF-FFFF-FFFFF D The destination MAC address of this data frame must be FFFF-FFFF-FFFFF.
• B.This data frame is an IEEE 802.3 frame
• C.This data frame is an Ethernet H frame.

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ICMP message types are ().

• A.ICMP packets inquiry
• B.ICMP error messages report
• C.ICMP packet transmission
• D.ICMP application packet

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Which of the following statements is false about ARP packets?

• A.Any network device needs to send ARP packets to obtain the data link layer identifier.
• B.ARP Reply packets are transmitted in Unicast mode
• C.ARP packets cannot traverse routers and cannot be forwarded to other broadcast domain.
• D.ARP Request packets are transmitted in broadcast mode

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Frame Relay and X.25 in common is that

• A.are based on the virtual circuit
• B.is only the second layer protocol
• C.support congestion detection, confirmation retransmission, flow control mechanisms
• D.packet switching technology is

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As the end systems and communication systems signal conversion equipment, modem (Modem) is essential for wide-area network devices in one. Modem and router connected to the serial port is divided into () two.

• A.Asynchronous
• B.Switching
• C.routed
• D.Synchronization

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