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>> Huawei H12-811_V2.0 Exam Questions <<
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NEW QUESTION # 101
In a wireless communication system, information is first converted into digital signals for easy circuit calculation and processing by the transmitter through source coding, and then converted into radio waves through channel coding and modulation. Which of the following parameters of a carrier are modified during the modulation process based on signal changes? (Select all that apply)
Answer: A,B,C
Explanation:
During modulation, the transmitter maps digital information onto certain physical characteristics of a carrier signal so that the information can be transmitted over the air. The three classic carrier parameters that can be modified are amplitude , frequency , and phase . Therefore, options A , B , and D are correct.
Amplitude modulation changes the strength of the carrier wave. Frequency modulation changes the oscillation rate of the carrier. Phase modulation changes the phase angle of the carrier relative to a reference. Modern wireless communication systems often combine these parameters, especially amplitude and phase, in complex digital modulation schemes such as QPSK, 16-QAM, 64-QAM, or higher-order QAM used in WLAN standards. Option C , channel, is not a carrier parameter modified during modulation. A channel refers to a frequency resource or spectrum allocation used for communication, not a physical waveform characteristic being directly altered to encode bits. HCIA-Datacom introduces these basic wireless concepts to help learners understand how WLAN signals are transmitted, how data rate improvements are achieved, and why different modulation methods have different requirements for signal quality and interference resistance.
NEW QUESTION # 102
A Huawei network device functioning as an AAA server is referred to as a local AAA server.
Compared with a remote AAA server, a local AAA server reduces operation costs. However, the amount of information that can be stored on a local AAA server is limited by the hardware performance of the device.
Answer: A
Explanation:
A local AAA server runs directly on the Huawei network device, which reduces deployment and operational costs compared to a remote AAA server. However, its storage capacity and processing capability are constrained by the device hardware resources, limiting the amount of AAA information it can maintain.
NEW QUESTION # 103
Which of the following variables defined in Python code is invalid?
Answer: C
Explanation:
In Python, variable names must follow identifier rules: they cannot start with a digit. The variable
2_r1 is invalid because it begins with the number 2, which violates Python naming conventions.
The other variables are valid because they either start with letters or underscores and follow proper identifier rules.
NEW QUESTION # 104
In an IPv6 address, two or more consecutive groups of 0s can be compressed using a double colon (::), reducing the overall length of the address. For example, 2001:DBFF:130F:0:0:0:0:130B can be compressed to
2001:DBFF:130F::130B.
Answer: A
Explanation:
IPv6 text representation permits zero compression to make long addresses easier to read and write. One or more consecutive 16-bit groups containing only zeros can be replaced by a double colon, subject to the rule that the double-colon compression is used only once in a single IPv6 address; otherwise the number of omitted groups would be ambiguous. In the address 2001:DBFF:130F:0:0:0:0:130B, four consecutive zero groups appear between 130F and 130B. Replacing that run with :: produces 2001:DBFF:130F::130B, which expands back unambiguously to the original eight groups. Leading zeros within an individual 16-bit group can also be omitted, but that is a separate abbreviation rule. The example in the question follows valid IPv6 notation and does not alter the numeric address. Consequently, the statement that the address can be compressed in the manner shown is TRUE. The correct answer is A. The compression changes only the written representation of the IPv6 address; it does not change the underlying 128-bit address value itself in any way.
NEW QUESTION # 105
The figure shows the simplified topology of an enterprise campus network. On this network, the aging time of dynamic MAC address entries on switches is 300 seconds. The administrator connects PC1 to GE1/0/1 of SW1 and successfully pings the IP address of PC2 from PC1. Then, the administrator disconnects the Ethernet cable of PC1 from GE1/0/1 of SW1, immediately connects the cable to GE1/0/2 of SW1, and pings the IP address of PC2 from PC1. Which of the following operations does SW1 perform after receiving a data frame from PC1 when PC1 is connected to GE1/0/2 of SW1?
Answer: D
Explanation:
An Ethernet switch learns MAC address entries dynamically by examining the source MAC address of incoming frames. When SW1 first receives frames from PC1 on GE1/0/1, it creates a MAC address table entry mapping PC1's MAC address to that port. If PC1 later sends frames that arrive on GE1/0/2, SW1 updates the learned entry to reflect the new incoming interface.
Therefore, option B is correct: SW1 saves the mapping between PC1's MAC address and GE1/0/2 and removes or overwrites the old mapping associated with GE1/0/1.
NEW QUESTION # 106
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