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Question 1:
Which of the following is true about the flag field in the HDLC frame? (multiple choice)
A. The fixed value is 01111110
B. Start and end of the flag field flag frame
C. Two flag fields are required between the two frames at the beginning of the frame and at the end of the frame.
D. The channel is still active at the time of no frame transmission. In this state, the sender continuously sends the flag field, and the receiver detects each received flag field.
Correct Answer: ABD
Question 2:
Which of the following is the correct description of the configuration BPDU generation? (multiple choice)
A. As long as the port is enabled with STP, the configuration BPDU will be sent from the designated port at regular intervals.
B. When the root port receives the configuration BPDU, the device where the root port resides will copy a configuration BPDU to each of its designated ports.
C. When the designated port receives a configuration BPDU that is worse than itself, it will immediately send its own BPDU to the downstream device.
D. The topology of the non-root bridge changes. The BPDU is notified by configuring the BPDU.
Correct Answer: ABC
Question 3:
The following description of the advantages of optical fiber as a transmission medium, what are the correct ones? (multiple choice) A. Not susceptible to interference from electromagnetic signals
B. High transmission rate
C. The transmission distance is infinitely long
D. Expensive
Correct Answer: ABD
Question 4:
Which of the following technologies can save the number of IP addresses?
A. NAT
B. DNS
C. CIDR
D. VLSM
Correct Answer: A
Question 5:
Adding a shielding layer on the outside of the twisted pair, called (), can improve the anti- electromagnetic interference capability of the twisted pair.
A. STP
B. UTP
C. BTP
D. RPR
Correct Answer: A
Question 6:
What is the correct statement about free ARP? (multiple choice)
A. By sending a free ARP, you can confirm whether the IP address has a conflict.
B. The free ARP packet format belongs to the AR request packet.
C. Free ARP helps update old IP address information
D. The free ARP packet format belongs to the ARP reply packet.
Correct Answer: AB
Question 7:
If there is a routing loop in the network, then the packet will be forwarded on the loop link until the loop is eliminated.
A. True
B. False
Correct Answer: B
Question 8:
The network administrator is removing multiple VLANs from the switch. When the administrator enters the undo vlan 1 command, he receives an error message. What is the cause of the error message?
A. VLAN can only be deleted by the user who created it
B. VLAN 1 can be deleted only after the role of VLAN 1 is assigned to other VLANs.
C. The command was not entered correctly, resulting in a syntax error
D. VLAN 1 is the default management VLAN and cannot be deleted.
Correct Answer: D
Question 9:
Which of the following statements about Frame Relay is correct? (multiple choice)
A. DLCI is only valid on the local interface and the peer interface directly connected to it.
B. PVC is a virtual connection that can only be established between DCEs
C. The frame relay address mapping table stores the mapping relationship between the peer IP address and the DLCI of the next hop.
D. The reverse address resolution protocol can obtain the corresponding DLCI through the peer IP.
Correct Answer: AC
Question 10:
Which of the following protocols provides a connectionless transport service?
A. IP
B. IPX
C. TCP
D. UDP
Correct Answer: D
Question 11:
In an OSPF network, the following description about the Router ID is incorrect.
A. The router IDs must be the same in the same are
B. The router IDs in different areas can be different.
C. The router ID must be the IP address of an interface on the router.
D. You must manually configure the specified router ID.
E. The prerequisite for the normal operation of OSPF is that the router has a router ID.
Correct Answer: D
Question 12:
In which of the following cases, ICMP error report message is not sent? (multiple choice)
A. The body of the ICMP error report
B. All subsequent datagrams for the first fragmented datagram
C. Datagrams with multicast addresses
D. Datagram for special address 10.0.0.0
Correct Answer: ABC
Question 13:
In the OSI model, which of the following is the correct description of the physical layer function?
A. Ensure that the data is transmitted correctly.
B. Determine how packets are forwarded and routed
C. Transmitting the bit stream on the channel
D. Error correction and flow control
Correct Answer: C
Question 14:
In VRP, what are the following statements about RIP route aggregation?
A. RIP V1 supports route aggregation by default. You can disable route aggregation when needed.
B. RIP V2 supports off route aggregation.
C. RIP V1 does not support CIDR
D. RIP V2 supports subnet route aggregation
Correct Answer: BCD
Question 15:
How many insulated copper wires are discharged together and then twisted together in a regular way to form a twisted pair?
A. 2
B. 3
C. 8
D. 16
Correct Answer: A