In the PPP link establishment phase, the receiver receives data packets LCP code does not recognize, they will send an LCP to the right side of () message

• A.Protocol-Reject packet
• B.Code-NAK packets
• C.Field-Reject message
• D.Code-Reject packet

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Which of the following is the data link layer functionality?

• A.Network topology
• B.test error
• C.define the physical address
• D.Routing
• E.Physical media access

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Refer to the capture output. The administrator has captured three packets in the network. Which statement regarding the captured packets is incorrect?

• A.This packets represent a TCP three-way handshake process.
• B.10.0.12.1 uses port 50190 to buid the telnet connection.
• C.The three packets contain no application data.
• D.10.0.12.1 is the telnet server, while 10.0.12.2 is the telnet client.

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NAT can be implemented in a variety of ways, suitable for different scenarios. For example, dynamic NAT can translate the server address inside the private network into a public IP address.
Provide services to the public network.

• A.Wrong
• B.Yes

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As shown in the Display information, when the switch needs to forward a frame with a destination MAC address of 5489-98ec-f011. The following description is correct ().

• A.The switch did not find a matching entry in the MAC address table, so the frame will be discarded.
• B.The switch will send the target unreachable message to the source device.
• C.The switch needs to send a request to discover the device with the MAC address 5489-98ec-f011.
• D.The switch will flood the frame on all ports except the one that received the frame.

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