GB0-372-MOCK

1.Which of the following statements about the functions of the access layer are true? ______.

A. Plenty of interfaces to connect end users' computers

B. Access security control

C. High-speed packet exchange

D. Complex routing policies

2.Which of the following statements about the interoperability between sub VLANs in the super VLAN technology is true? _____

A. The IP addresses of hosts in different sub VLANs belong to the same network segment. These hosts can directly communicate with each other through Layer 2 forwarding.

B. The IP addresses of hosts in different sub VLANs belong to the same network segment, but they cannot directly communicate with each other because they are isolated from each other by the sub VLANs.

C. Layer 2 isolation applies between hosts in different sub VLANs. In terms of Layer 3, these hosts can communicate with each other by deploying the common proxy ARP technology on super VLAN interfaces.

D. Layer 2 isolation applies between hosts in different sub VLANs. In terms of Layer 3, these hosts can communicate with each other by deploying the local proxy ARP technology on super VLAN interfaces.

3.Which of the following description about MAC address table learning of a switch is correct?

A. The switch periodically sends MAC address detection packets to the PC.

B. When a PC sends a data frame on the network, the switch records the source MAC address.

C. When the switch receives an ARP reply packet from a PC, it records the source MAC address.

D. The PC periodically sends MAC address packets to the switch.

4.Which of the following statements about the timer configuration of STP are true? ______.

A. We should adjust the Hello Time to the maximum value and the Forward Delay to the minimum value, so that we can reduce the number of Hello messages on the network and the ports can enter forwarding status within the shortest possible time.

B. We should adjust the Max Age to the minimum value to shorten the BPDU aging time and discover link faults in time.

C. We can set the Hello Time to an appropriate value to reduce the spanning tree computation loss and enhance the robustness of the spanning tree.
An excessively large or small value of the Hello Time will affect spanning tree computation/generation and network stability.

D. It is not recommended that the Hello Time, Forward Delay, and Max Age be manually configured. The switch will automatically set the timer values according to the network diameter.

5.The loop on the LAN may result in ______

A. Broadcast storm

B. Port rate changes

C. Port duplex mode changes

D. MAC address learning mistakes

6.Which of the following description about the relationship between RSTP and STP is correct?

A. RSTP is defined in the IEEE 802.1D standard, and its protocol idea is the same as STP, but it is improved in convergence time.

B. The switch running RSTP can work with the switch running STP and improve the convergence time of STP.

C. RSTP can balance the loads of different VLANs among Trunk links based on STP.

D. RSTP has all the features of STP, but it uses only one type of BPDU.

7.Which of the following description about the spanning tree protection mechanisms is correct?

A. BPDU protection is configured in the edge port view.

B. The root bridge protection command is effective only after it is configured for the root bridge.

C. The loop protection command needs to be configured for each port in the physical loop.

D. After the TC protection threshold is configured, if the number of TC packets received by the device within 10s (default period) exceeds the threshold, the device will not delete the address entries within this period.

8.Which of the following description about the MST region is correct?

A. Switches in the same MST region must have the same VLAN and instance mapping relationship.

B. If the MST region names configured for two switches are different, the two switches must belong to different MST regions.

C. The MSTP switches need to exchange the complete information about mapping between the VLANs and the instances. If the mappings are different, the switches do not belong to the same MST region.

D. The protocol running among the MST regions is RSTP.

9.BFD packets are encapsulated in _____ and the destination port is _____.

A. UDP 3785

B. TCP 3785

C. UDP 4784

D. UDP 3784

10.Two routers are connected to each through a local area network to form a VRRP group. The VRRP timer configurations are configured on various interfaces as follows:
[RTA-GigabitEthernet1/0]vrrp vrid 1 timer advertise 500
[RTB-GigabitEthernet1/0]vrrp vrid 1 timer advertise 500
VRRP group 1 operates normally. RTA is the master router, and RTB is the backup router. If RTA fails a certain period of time later, RTB will change from Backup status to Master status within ______.

A. 3 seconds

B. 5 seconds

C. 12 seconds

D. 20 seconds

11.Which of the following addresses is not an IPv4 multicast address?

A. 232.255.255.255

B. 242.255.255.250

C. 239.255.255.255

D. 224.0.0.13

12.PIM routers send Hello messages to discover neighbors and establish and maintain neighbor relationships. The destination IP address of the Hello message is ______.

A. 224.0.0.1

B. 224.0.0.2

C. 224.0.0.13

D. 224.0.0.18

13.SSH is a secure remote login protocol. In order to ensure the security of remote login, which of the following authentication methods is supported by SSH?

A. Public key authentication

B. Password authentication

C. Private key authentication

D. Random word authentication

14.SNMP adopts the client/server (C/S) structure and implements packet transmission based on UDP. For normal packet exchange between the NMS workstation and the SNMP agent, they need to listen to specific UDP ports. Which of the following statements about the port numbers of the listened ports is true? ______.

A. Both the NMS workstation and the SNMP agent listen to UDP port 161.

B. Both the NMS workstation and the SNMP agent listen to UDP port 162.

C. The NMS workstation listens to UDP port 161, and the SNMP agent listens to UDP port 162.

D. The NMS workstation listens to UDP port 162, and the SNMP agent listens to UDP port 161.

15.Which of the following mirror group types are supported by H3C S-series switches?

A. Local

B. Remote-source

C. Remote-destination

D. Remote

GB0-372-MOCK Reference Answer