[2024年02月]更新のHPE3-U01問題集PDFでHPE3-U01リアル試験問題解答
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HPE3-U01試験は、60問の多肢選択問題で構成されたコンピュータベースの試験です。試験時間は90分で、合格点は70％です。英語、スペイン語、フランス語、ドイツ語、日本語など、さまざまな言語で受験が可能です。試験料金は場所によって異なりますが、通常は約200ドルです。
HP HPE3-U01（Aruba Certified Network Technician）試験は、Aruba WiredおよびWireless Networksの構成、管理、およびトラブルシューティングにおける個人の知識とスキルを検証する業界標準認定です。この認定は、アルバネットワークソリューションのインストール、構成、およびメンテナンスを担当するネットワーク技術者向けに設計されています。この試験に合格することにより、候補者はアルバネットワークテクノロジーの習熟度を実証し、IT雇用市場で競争力を獲得できます。
認定試験は60問の多肢選択問題から成り、90分間続きます。受験者は試験に合格し、認定を受けるために少なくとも70％のスコアを取得する必要があります。試験は英語と日本語で利用可能で、Pearson VUEテストセンターまたはPearson VUEプラットフォームを通じてオンラインで受験できます。
質問 # 12
What is the decimal equivalent of the binary number 10001010?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
解説：
Explanation
To convert a binary number to a decimal number, we need to follow these steps:
* Write down the binary number and assign a power of 2 to each digit, starting from the rightmost with
2^0.
* Convert each binary digit to its decimal equivalent by multiplying it with its power of 2.
* Add all the decimal values to get the decimal equivalent of the binary number.
Let's apply these steps to the binary number 10001010:
* 10001010 = 0 × 2^0 + 1 × 2^1 + 0 × 2^2 + 1 × 2^3 + 0 × 2^4 + 0 × 2^5 + 0 × 2^6 + 1 × 2^7
* 10001010 = 0 + 2 + 0 + 8 + 0 + 0 + 0 + 128
* 10001010 = 138 in decimal
Therefore, the decimal equivalent of the binary number 10001010 is 138 (option A).
References: The answer can be verified by using the following resources:
* Convert 10001010 from binary to decimal - Calculator Online
* How to Convert decimal number 10001010 in binary? - CoolConversion
* 10001010 to decimal - Calculatio
* Binary Code | Binary: 10001010 | Decimal: 138 | Bits: 8
質問 # 13
You have connected a Multilayer switch to an Internet Service Provider router that has the 172.16.31.254 IP address. What configuration line do you have to enter on your switch to enable internet access?
- A. ip routing 0/0 172.16.31.254
- B. Ip route 0.0.0.0/0 172.16.31.254
- C. routing 0.0.0.0/0 172.16.31.254/24
- D. route 172.16.31.254 0.0.0.0 0.0.0.0
正解：D
質問 # 14
What is part of the 5 GHz band?
- A. Channels 149 to 161
- B. U-NII 5
- C. Channel14
- D. Channel 12 and 13
正解：A
質問 # 15
Which unit of measurement is recommended for expressing radio frequency power due to its logarithmic nature?
- A. milliwatt (mW)
- B. lumens
- C. decibel relative to isotrope (dBi)
- D. decibel relative to milliwatt (dBm)
正解：D
解説：
Explanation
Radio frequency (RF) power is the amount of energy radiated by an antenna or a transmitter in the form of electromagnetic waves. RF power can be measured in different units, such as watts (W), milliwatts (mW), or decibels (dB). However, some units are more convenient than others for expressing RF power due to its logarithmic nature1 Logarithmic units, such as dB, are useful for comparing power levels that span several orders of magnitude, such as the power output of a radio station versus the power received by a mobile device. Logarithmic units also simplify the calculation of power ratios, gains, and losses, as they can be added or subtracted instead of multiplied or divided12 One common logarithmic unit for RF power is the decibel relative to milliwatt (dBm), which is defined as the power level in dB with reference to 1 mW. For example, 0 dBm means 1 mW, 10 dBm means 10 mW, 20 dBm means 100 mW, and so on. Conversely, -10 dBm means 0.1 mW, -20 dBm means 0.01 mW, and so on. The dBm unit is convenient because many RF signals, especially in wireless communication, are at fairly low power levels, and the dBm unit can express them in a short form23 Another logarithmic unit for RF power is the decibel relative to isotrope (dBi), which is defined as the power level in dB with reference to an isotropic radiator, which is a hypothetical antenna that radiates equally in all directions. The dBi unit is used to measure the gain of an antenna, which is the ratio of the power radiated by the antenna in a specific direction to the power radiated by an isotropic radiator. For example, a 3 dBi antenna means that it radiates 3 dB more power than an isotropic radiator in its main direction. The dBi unit is not suitable for expressing absolute power levels, as it depends on the reference antenna45 Therefore, the recommended unit of measurement for expressing RF power due to its logarithmic nature is the dBm, as it is an absolute unit that can compare power levels across a wide range and simplify power calculations. The dBi unit is only used for expressing antenna gain, which is a relative unit that depends on the reference antenna. The other units, such as lumens and milliwatts, are not logarithmic and are not commonly used for RF power measurement12345 References: 1: Radio frequency - Wikipedia 2: dBm - Wikipedia 3: RF power measurement, Part 1: Why and where - Analog IC Tips 4: Radiant intensity - Wikipedia 5: Fundamentals of RF and Microwave Power Measurements - UC Davis
質問 # 16
You have connected a Multilayer switch to an Internet Service Provider router that has the 172.16.31.254 IP address. What configuration line do you have to enter on your switch to enable internet access?
- A. ip routing 0/0 172.16.31.254
- B. Ip route 0.0.0.0/0 172.16.31.254
- C. route 172.16.31.254 0.0.0.0 0.0.0.0
- D. routing 0.0.0.0/0 172.16.31.254/24
正解：B
解説：
Explanation
To enable internet access on a multilayer switch, you need to configure a default route that points to the ISP router as the next hop. A default route is a special type of static route that matches any destination IP address that is not found in the routing table. The syntax for adefault route is ip route 0.0.0.0 0.0.0.0
<next-hop-ip-address>, where 0.0.0.0 0.0.0.0 means any IP address and any subnet mask. Alternatively, you can use the slash notation 0.0.0.0/0 to represent the same thing. Therefore, the correct configuration line to enter on the switch is ip route 0.0.0.0/0 172.16.31.254, which means that any traffic that is not destined for a local network will be forwarded to the ISP router at 172.16.31.254.
The other options are incorrect because they either use the wrong syntax or the wrong IP address. Option A uses the route command instead of the ip route command, which is not valid on a multilayer switch. Option C uses the routing command instead of the ip route command, which is also not valid on a multilayer switch.
Option D uses the ip routing command instead of the ip route command, which is used to enable routing on the switch, not to configure a default route. Option D also omits the dots in the IP address and the subnet mask, which makes it invalid.
References:
* What Is a Multilayer Switch and How to Use It?
* Inter-VLAN Routing Configuration - 2024 Step-by-Step Tutorial
* Multilayer Switch - Configuring IP Multilayer Switching
質問 # 17
What do the digits in the ArubaOS-CX switch interface numbering represent?
- A. Stack/Member/Port
- B. Module/Slot/Port
- C. Slot/Member/Port
- D. Member/Slot/Port
正解：D
解説：
Explanation
The digits in the ArubaOS-CX switch interface numbering represent the member, slot, and port numbers of the physical ports and their corresponding logical software interfaces. The format is member / slot / port, where:
* Member: Member number of the switch in a Virtual Switching Framework (VSF) stack. Range: 1 to 8.
The primary switch is always member 1. VSF is a technology that allows multiple switches to operate as a single logical device, providing high availability, scalability, and simplified management.
* Slot: Slot number of the module on the switch chassis. Range: 1 to 6. The 6400 Switch Series has six slots for line cards, while the 8320, 8325, and 8400 Switch Series have four slots for line cards and two slots for management modules.
* Port: Port number of the interface on the module. Range: 1 to 48 for 1G/10G ports, 1 to 32 for 25G ports, and 1 to 8 for 40G/100G ports.
For example, interface 1/1/1 refers to the first port on the first module of the first switch in a VSF stack.
References:
* Identifying switch ports and interfaces
* ArubaOS-CX 10.05 Command-Line Interface Guide 6200 Switch Series
* ArubaOS-CX 10.04 Virtual Switching Extension (VSX) Guide
質問 # 18
What is the maximum recommended distance for a 1 Gbps Ethernet connection using Cat 6 UTP-based cabling between a host and the switch where it is plugged in?
- A. 50 meters (164 feet)
- B. 300 meters (984 feet)
- C. 100 meters (328 feet)
- D. 15 meters (49 feet)
正解：C
質問 # 19
What is the goal of the TCP three-way handshake?
- A. To notify the destination who the originator is.
- B. To notify the number of segments that will be sent.
- C. To establish a reliable, flow-controlled connection.
- D. To acknowledge the reception of the segments.
正解：C
解説：
Explanation
The TCP three-way handshake is a process that is used in a TCP/IP network to create a connection between a client and a server. It involves the exchange of three packets: SYN, SYN-ACK, and ACK. The goal of the TCP three-way handshake is to establish a reliable, flow-controlled connection between the two endpoints.
This means that the connection is able to ensure that the data is transmitted without errors, losses, or duplications, and that the data is sent at a rate that both sides can handle.
The TCP three-way handshake works as follows:
* The client initiates the connection by sending a SYN packet to the server. The SYN packet contains a random sequence number that indicates the starting point of the data that the client will send.
* The server responds to the client by sending a SYN-ACK packet. The SYN-ACK packet contains the server's own sequence number and an acknowledgment number that is equal to the client's sequence number plus one. This indicates that the server has received the client's SYN packet and is ready to receive data from the client.
* The client completes the handshake by sending an ACK packet to the server. The ACK packet contains an acknowledgment number that is equal to the server's sequence number plus one. This indicates that the client has received the server's SYN-ACK packet and is ready to send data to the server.
After the TCP three-way handshake is completed, the connection is established and the data transfer can begin.
References: The answer can be verified by using the following resources:
* TCP 3-Way Handshake Process - GeeksforGeeks
* TCP 3-Way Handshake (SYN, SYN-ACK,ACK) - Guru99
* Akamai Blog | What is a TCP Three-Way Handshake?
* What is a Three-Way Handshake? - Definition from Techopedia
* What is TCP 3-Way Handshake, Benefits, and Drawbacks? - Networking Signal
質問 # 20
Which organization provides certifications that ensure interoperability between WLAN vendors?
- A. Institute of Electrical and Electronics Engineers
- B. Federal Communications Commission
- C. Wi-Fi Alliance
- D. Internet Engineering Task Force
正解：C
解説：
Explanation
The Wi-Fi Alliance is an organization that promotes interoperability among WLAN device manufacturers. The Wi-Fi Alliance is an important organization for the advancement of wireless LAN (WLAN) technology. It develops certification programs and technologies that deliver quality Wi-Fi experiences. Members have completed more than 80,000 certifications. Through industry-developed comprehensive testing, Wi-Fi Alliance certification programs ensure that Wi-Fi products from multiple manufacturers work well together.
These certification programs are foundational to the rapid adoption and proliferation of Wi-Fi products in home, office, and public access locations around the world and underpin the success of Wi-Fi technology proliferation. Only Wi-Fi CERTIFIED products have been tested to deliver interoperability with the latest technologies, and industry-standard security protections. The Wi-Fi CERTIFIED logo gives consumersconfidence that the Wi-Fi devices purchased deliver a positive user experience, regardless of brand.
For retailers, vendors, and service providers, the Wi-Fi CERTIFIED seal of approval means consistent performance and better user experience. A company must be a member of Wi-Fi Alliance and achieve certification to use the Wi-Fi CERTIFIED logo and Wi-Fi CERTIFIED certification marks. The Wi-Fi Alliance certification programs cover the following categories: Connectivity, Security, Mobility, Coexistence, and Performance123. References: Certification | Wi-Fi Alliance, Programs | Wi-Fi Alliance, Aruba Certified Network Technician Exam HPE3-U01 Actual Questions, Why Wi-Fi Certification Really Matters | Aruba Blogs
質問 # 21
What is the binary equivalent of the decimal number of 233?
- A. 0
- B. 1
- C. 2
- D. 3
正解：C
解説：
Explanation
The binary equivalent of the decimal number of 233 is 11101001. To find this, we can use the following method:
* Divide 233 by 2 and write down the remainder. The remainder is either 0 or 1.
* Divide the quotient by 2 and write down the new remainder.
* Repeat this process until the quotient is 0.
* Write the remainders from the bottom to the top. This is the binary equivalent.
For example:
Table
Quotient
Remainder
233 / 2
1
116 / 2
0
58 / 2
0
29 / 2
1
14 / 2
0
7 / 2
1
3 / 2
1
1 / 2
1
0 / 2
0
The remainders from the bottom to the top are 11101001, which is the binary equivalent of 233.
References:
1: Decimal to Binary Converter - RapidTables 2: How to Convert Decimal to Binary - wikiHow 3: Decimal to Binary Conversion Methods - GeeksforGeeks
質問 # 22
Which condition allows 5Ghz channels to avoid Adjacent Channel Interference?
- A. transmit at 40 MHz bandwidth
- B. transmit at low power levels
- C. transmit at high power levels
- D. transmit at 20 MHz bandwidth
正解：A
解説：
Explanation
Adjacent Channel Interference (ACI) is a type of interference that occurs when two or more wireless devices use channels that are close to each other in the same frequency band. ACI reduces the signal quality and throughput of the wireless devices, as they have to compete for the same spectrum and deal with the noise from the neighboring channels12 The 5 GHz band has more non-overlapping channels than the 2.4 GHz band, which means that there is less chance of ACI in the 5 GHz band. However, ACI can still occur in the 5 GHz band if the wireless devices use wider channel bandwidths, such as 40 MHz or 80 MHz, which are supported by 802.11n and 802.11ac standards. Wider channel bandwidths can increase the data rate and performance of the wireless devices, but they also occupy more spectrum and reduce the number of available channels134 Therefore, one condition that allows 5 GHz channels to avoid ACI is to transmit at 20 MHz bandwidth, which is the narrowest channel bandwidth supported by 802.11a/n/ac standards. By transmitting at 20 MHz bandwidth, the wireless devices can use more non-overlapping channels in the 5 GHz band and minimize the impact of ACI. However, this alsomeans that the wireless devices will have lower data rates and performance than using wider channel bandwidths134 Another condition that can help avoid ACI in the 5 GHz band is to use channel bonding, which is a technique that combines two or more adjacent channels into one wider channel. Channel bonding can increase the data rate and performance of the wireless devices, but it also requires careful planning and coordination to avoid overlapping with other wireless devices. Channel bonding can be done with 40 MHz or 80 MHz channel bandwidths, but not with 20 MHz channel bandwidths134 References:
https://www.ti.com/pdfs/bcg/80211_acr_wp.pdf
https://www.ti.com/pdfs/bcg/80211_acr_wp.pdf
質問 # 23
How many addresses does the 255.255.252.0 provide?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
質問 # 24
WhichOSImodel layer is in charge of creating data?
- A. Layer 4
- B. Layer 7
- C. Physical
- D. Transport
正解：D
質問 # 25
What is the binary equivalent of the Hexadecimal number 17?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
解説：
Explanation
To convert a hexadecimal number to a binary number, we need to follow these steps:
* Write down the hexadecimal number and assign a power of 16 to each digit, starting from the rightmost with 16^0.
* Convert each hexadecimal digit to its decimal equivalent by multiplying it with its power of 16.
* Add all the decimal values to get the decimal equivalent of the hexadecimal number.
* Divide the decimal number by 2 repeatedly and write down the remainders from bottom to top.
* The binary number is the sequence of remainders obtained in the previous step.
Let's apply these steps to the hexadecimal number 17:
* 17 = 1 × 16^1 + 7 × 16^0
* 17 = 16 + 7
* 17 = 23 in decimal
* 23 / 2 = 11 with remainder 1
* 11 / 2 = 5 with remainder 1
* 5 / 2 = 2 with remainder 1
* 2 / 2 = 1 with remainder 0
* 1 / 2 = 0 with remainder 1
* The binary number is 10111
Therefore, the binary equivalent of the hexadecimal number 17 is 10111 (option B).
References: The answer can be verified by using the following resources:
* Hexadecimal to Binary Converter - Binary Hex Converters
* How to Convert 17 from hexadecimal to binary - Calculator Online
* Convert hexadecimal number 17 to binary - CoolConversion
* 17 in Binary - How to Convert 17 from Decimal to Binary? - Cuemath
質問 # 26
Which commands are required to configure interfaces 1 /1/1 and 1 /1/2 as VLAN 10 access ports in ArubaOS-CX switches?
- A. Option D
- B. Option C
- C. Option B
- D. Option A
正解：A
質問 # 27
To which wireless device category do a hardwire desktop PC belongs?
- A. intermittent mobile devices
- B. highly mobile devices
- C. somewhat mobile devices
- D. stationary devices
正解：B
質問 # 28
Which configurable switchport feature makes collisions impossible to occur?
- A. auto speed
- B. full-duplex
- C. VLANs
- D. half-duplex
正解：B
解説：
Explanation
Full-duplex is a switchport feature that allows simultaneous transmission and reception of data on a link, without causing collisions. Collisions occur when two devices try to send data at the same time on a shared medium, such as a half-duplex link or a hub. Full-duplex eliminates the need for collision detection and avoidance mechanisms, such as CSMA/CD, and increases the effective bandwidth of the link. Full-duplex requires both ends of the link to support and be configured for full-duplex mode. If one end is configured for full-duplex and the other for half-duplex, the result is a duplex mismatch, which causes performance issues and errors. Auto speed is a switchport feature that allows the switch to negotiate the speed of the link with the connected device, such as 10 Mbps, 100 Mbps, or 1000 Mbps. VLANs are logical groups of devices that share the same broadcast domain, regardless of their physical location or connection. VLANs can reduce collisions by segmenting the network and limiting the scope of broadcasts. However, VLANs alone do not prevent collisions on a link, as they depend on the duplex mode of the switchport. Half-duplex is a switchport feature that allows only one direction of data transmission at a time on a link, either sending or receiving. Half-duplex requires collision detection and avoidance mechanisms, such as CSMA/CD, to coordinate the access to the shared medium. Half-duplex reduces the effective bandwidth of the link by half, as only one device can use the link at a time. Half-duplex can cause collisions if two devices try to send data at the same time on the same link. References:
* Aruba Certified Network Technician (ACNT) | HPE Aruba Networking
* Aruba Documentation Portal
* switch port collisions - Cisco Community
* Why is a switch port a collision domain? - Cisco Community
質問 # 29
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