In a Layer 2 network with redundant links, which of the following protocols can be used to avoid loops?

• A.VRRP
• B.STP
• C.UDP
• D.ARP

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A network engineer prompts the following information when entering the command line:
Error: Unrecognized command found at ' ^ ' position. Which of the prompt information is correct?

• A.No keyword found
• B.Input command is not clear
• C.The input command is incomplete
• D.Wrong parameter type

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By default, what is the lease period for the DHCP server to assign an IP address? ()

• A.12h
• B.1h
• C.24h
• D.18h

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The correct statement about the transport layer protocol is ()

• A.Well-known port number range is 0-1023
• B.The establishment of a TCP connection is a three-way handshake, and the termination of a TCP connection requires a four-way handshake.
• C.UDP uses the STNOACK flag to request and confirm the establishment of a connection
• D.UDP is suitable for the transmission of delay-sensitive traffic, and can be reorganized according to the sequence number field in the message header

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As shown in the figure below. All hosts can communicate normally. Is the corresponding relationship between SWA MAC address and port correct? () (Single-choice question)

• A.MAC-A G0/0/2
  MAC-B GO/0/2
  MAC-C GO/0/3
• B.MAC-A GO/0/1
  MAC-B GO/0/1
  MAC-C GO/0/3
• C.MAC-A GO/0/1
  MAC-B G0/0/2
  MAC-C G0/0/1
• D.MAC-A GO/0/1
  MAC-B GO/0/2
  MAC-C GO/0/3

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