The two routers RTA and RTB are interconnected back-to-back using serial ports. The serial port of RTA is configured with HDLC protocol, and the serial port of RTB is configured with PPP protocol.
Both devices are configured with the correct IP address, then what will happen is ______. (Multiple choice)

• A.RTA serial port physical layer down, protocol layer down
• B.The physical and protocol layers of RTA and RTB serial ports are both down
• C.The physical layer of the RTB serial port is down, and the protocol layer is down.
• D.The physical layer of the RTA serial port is up, and the protocol layer remains up, but RTA cannot ping RTB
• E.RTB serial port physical layer up, protocol layer down

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A network connection is as follows:
HostA----GE0/0--MSR-1--S1/0---------S1/0--MSR-2--GE0/0----HostB
The customer requires that only ICMP messages between HostA and HostB are restricted. Which of the following is feasible? (multiple choice)

• A.Configure ACL on MSR-1 to prohibit ICMP packets from source host HostA to destination host HostB, and apply this ACL in the outbound direction of GE0/0 of MSR-1
• B.Configure an ACL on MSR-1 to prohibit ICMP packets from the source host HostB to the destination host HostA, and apply this ACL in the outbound direction of S1/0 of MSR-1
• C.Configure ACL on MSR-1 to prohibit ICMP packets from source host HostA to destination host HostB, and apply this ACL in the outbound direction of S1/0 of MSR-1
• D.Configure an ACL on MSR-1 to prohibit ICMP packets from the source host HostB to the destination host HostA, and apply this ACL in the outbound direction of GE0/0 of MSR-1

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The following statement about the functions of each layer of the OSI reference model is correct. ______. (Multiple choice)

• A.The physical layer refers to the original bit stream transmitted on the communication channel (Channel), which defines the mechanical and electrical functions and procedures required for data transmission.
• B.The network layer decides the best route for transmitting the message. The key issue is to determine how the data packet is routed from the source to the destination.
• C.The basic function of the transport layer is to establish and maintain virtual circuits, perform error checking and flow control.
• D.The session layer is responsible for data format processing, data encryption, etc.
• E.The application layer is responsible for providing network services for applications.

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Which of the following options are the features of 802.1x authentication based on MAC address? (multiple choice)

• A.When a user goes offline, only that user cannot use the network
• B.As long as the first user under the port is successfully authenticated, other access users can use network resources without authentication
• C.When the first user under the port goes offline, other users will also be denied access to the network
• D.All access users under the port need to be independently verified

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The following descriptions about Trunk ports and links are correct ______. (Multiple choice)

• A.The PVID value of the Trunk port cannot be modified
• B.When the Trunk port receives a data frame, when it is checked that the data frame does not have a VLAN ID, the data frame adds the corresponding PVID value to the port as the VLAN ID
• C.Trunk link can carry data frames with different VLAN IDs
• D.The data frames transmitted on the Trunk link are all with VLAN ID

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