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| Section | Objectives |
|---|---|
| Network Security Basics | - Basic network security concepts - Access control lists (ACL) |
| IP Services | - DHCP and DNS concepts - NAT basics |
| Network Fundamentals | - Basic network topologies and devices - OSI and TCP/IP models |
| Routing Technologies | - Dynamic routing fundamentals (OSPF basics) - Static routing |
| Switching Technologies | - VLAN configuration and trunking - STP/RSTP concepts |
| IP Addressing and Subnetting | - IPv6 fundamentals - IPv4 addressing and subnet masks |
| Network Management and Troubleshooting | - Device management concepts - Basic troubleshooting tools and methods |
| WLAN Basics | - Wireless networking fundamentals |
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問題 #37
On the network shown in the figure, if sent by Host A, data frames with which of the following destination MAC addresses can be received by Host B and Host C at the same time?
答案：A,B
解題說明：
The destination address FF-FF-FF-FF-FF-FF is the Ethernet broadcast address. A switch floods a broadcast frame through the other eligible ports in the same VLAN, so both Host B and Host C can receive the frame.
Option C, 53-80-C2-00-00-01, is a multicast MAC address because the individual/group bit, which is the least significant bit of the first octet, is 1. The first octet 0x53 has a binary least significant bit of 1, identifying a group address. Multicast frames may therefore be delivered to multiple receivers in the same Layer 2 domain, depending on multicast handling and membership behavior. By contrast, the first octets in options B and D,
0x98 and 0x34, have a least significant bit of 0 and are unicast addresses. A unicast frame is intended for a single MAC destination and is not normally delivered simultaneously to both hosts. Therefore A and C are the correct choices. This classification is fundamental when predicting whether a switched Ethernet frame is delivered to one station or replicated to multiple receivers simultaneously.
問題 #38
The administrator runs the interface Eth-Trunk 1 command to create Eth-Trunk 1 on SW1 and SW2. After the network is stable, the administrator runs the display interface brief command on SW1, and finds that Eth-Trunk 1 is Down, the states of its member interfaces are normal, and the configuration on SW1 is correct. The possible cause is that the member interfaces on SW2 are not added to Eth-Trunk 1.
答案：A
解題說明：
An Eth-Trunk will remain down if there is a configuration inconsistency between the two ends, but it is not specifically caused by missing member interfaces on the remote device alone. Even if SW2 has not added member interfaces, the local configuration and negotiation state (such as LACP or static Eth-Trunk consistency checks) would still determine the status, and other mismatch conditions could also lead to the same symptom. Therefore, the stated cause is not the only or guaranteed reason for the Eth-Trunk being down, making the statement incorrect.
問題 #39
After entering an incomplete command keyword on the CLI of a Huawei switch, you can press Tab to complete the keyword. If the entered keyword does not change after you press Tab, the possible reason is that the matched keyword is not unique, and YunShan OS cannot determine which specific command it corresponds to.
答案：B
解題說明：
Huawei YunShan OS provides command-line completion to simplify device configuration and reduce typing errors. Pressing the Tab key can automatically complete a partially entered command keyword.
When the entered characters uniquely identify a valid keyword, the CLI can expand the incomplete input into the corresponding complete keyword.
However, when multiple command keywords share the same prefix, the system cannot immediately determine which keyword the administrator intends to use.
In this situation, the input may remain incomplete, and the administrator can press Tab repeatedly to cycle through possible matching keywords or enter additional characters to distinguish the intended command.
For example, typing a short prefix shared by several commands does not uniquely identify a single command.
Therefore, the statement describes a valid possible reason why command completion does not occur immediately. The correct answer is TRUE.
問題 #40
Which of the following commands can an administrator run to specify the configuration file for the next startup?
答案：B
解題說明：
On Huawei VRP, the startup saved-configuration command specifies the configuration file that the device will load at the next restart. This is distinct from selecting the system software image. The startup system- software command identifies the software package used for the next boot, whereas startup saved- configuration identifies the saved configuration that should be restored after the software starts. The reset saved-configuration command clears the saved startup configuration rather than selecting one, and reset factory-configuration is used to restore factory-related settings on platforms that support it. In normal operations, an administrator first saves or uploads a valid configuration file to local storage and then uses startup saved-configuration to nominate that file for the next startup. The selected file must be in a format supported by the device and accessible in its file system. Therefore, when the requirement is specifically to define which configuration file is used after the next reboot, option B is the correct Huawei VRP command.
問題 #41
You define the following function in Python: def add(a, b, c):
return a + b + c. You then add the following code. To ensure that the code is correctly executed, sort the following statements in sequence.
答案：
解題說明：
Explanation:
1) a = 3; 2) b = a + 3; 3) c = a + b; 4) print(add(a, b, c))
The statements must be executed in dependency order. The function add(a, b, c) can be called only after values have been assigned to the variables that are passed as its three arguments. First, a must be set to 3. The next statement, b = a + 3, depends on a already existing, so it must follow the assignment to a. The statement c = a + b depends on both a and b, so it must be executed after b has been calculated. Finally, print(add(a, b, c)) can run only after a, b, and c all have valid values. With this order, a equals 3, b equals 6, and c equals 9.
The function therefore returns 3 + 6 + 9, and print displays 18. Executing the statements in another order would attempt to reference an undefined variable and raise a NameError. The correct sequence is: a = 3, b = a
+ 3, c = a + b, then print(add(a, b, c)).
問題 #42
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