HPE3-U01 Exam Brain Dumps - Study Notes and Theory [May-2024]
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HP HPE3-U01 (Aruba Certified Network Technician) certification exam is designed to assess an individual's technical expertise in the area of wired and wireless networking solutions. HPE3-U01 exam covers a range of topics, including network fundamentals, wireless LAN design, management and troubleshooting, network security and access control, and more. Aruba Certified Network Technician Exam certification exam is intended for IT professionals who are responsible for implementing and supporting Aruba networking solutions in their organizations.
HP HPE3-U01 exam is composed of 60 multiple-choice questions to be completed within 90 minutes. Candidates are required to score at least 70% to pass the exam. To prepare for the test, candidates have many resources available, from official study guides to online courses focusing on Aruba technologies. Aruba also offers practical lab sessions to help candidates gain hands-on experience in troubleshooting and configuring Aruba products. HPE3-U01 exam is available in English and Japanese languages and can be scheduled at any Pearson VUE testing center.
NEW QUESTION # 29
Which unit of measurement is recommended for expressing radio frequency power due to its logarithmic nature?
- A. milliwatt (mW)
- B. decibel relative to isotrope (dBi)
- C. lumens
- D. decibel relative to milliwatt (dBm)
Answer: D
Explanation:
Explanation
Decibel (dB)Decibel is a logarithmic unit of measure used to express the ratio of two values of the same measure. This unit is not included to the System International of units (SI), but it is widely used in communication systems and many other technical fields, as it allows to compare two values of any nature, provided that these values are expressed in the same unit.
Decibel is a decile of the main, larger unit - Bel. Bel is a common logarithm of the ratio of two energies. But in practice Bel was a far too big value, therefore its tenth part is used - decibel.
The logarithmic method of presentation of numbers often can be very useful, as it allows to replace multiplication with addition, division with subtraction, raising to power with multiplication, and extracting a root with the division.
What is measured in dB in the MRFC:
* Gain constant
* Sound level
* Signal/noise ratio
* Signal attenuation
https://en.cyclopedia.ifcg.ru/wiki/Radiofrequency_characteristics
NEW QUESTION # 30
What are the key differences between L2 switches and routers? (Select two.)
- A. Switches build a MAC table while routers build a routing table.
- B. Routers offer a considerably higher port density than switches.
- C. Switches offer a considerably higher port density than routers.
- D. Switches build an ARP table, while routers build a port table.
- E. Switches are considered L2 devices, while routers are L4.
Answer: A,C
Explanation:
Explanation
Switches and routers are both networking devices that operate at different layers of the OSI model and perform different functions. The key differences between L2 switches and routers are:
* Switches operate at the data link layer (Layer 2) of the OSI model, while routers operate at the network layer (Layer 3). This means that switches forward frames based on the MAC addresses of the source and destination devices, while routers route packets based on the IP addresses of the source and destination networks.
* Switches build a MAC table that maps MAC addresses to switch ports, while routers build a routing table that maps IP addresses to next-hop interfaces. The MAC table is used by switches to determine which port to send a frame to, while the routing table is used by routers to determine which interface to send a packet to.
* Switches offer a considerably higher port density than routers, meaning that they can connect more devices to the network. Switches typically have dozens or hundreds of Ethernet ports, while routers usually have a few Ethernet ports and other types of ports such as ADSL, cable, fiber, dial-up, etc.
Switches are used to create LAN segments, while routers are used to connect different networks or subnets.
* Switches are faster than routers because they do not take up time looking at the network layer header information. Switches can forward frames at wire speed, while routers need to process packets at the network layer and perform additional functions such as NAT, firewall, QoS, etc.
References: Switch (L2/L3) Vs Router: Comparison and Differences in TCP/IP Networks, Key Differences Between Routers and Different Types of Switches, Layer 2 Switch - How it operates, when to use it - Network Encyclopedia, Layer 2 switching - Study-CCNA, Differences Between Layer 2 and Layer 3 SwitchesWhich one do you need
NEW QUESTION # 31
Which table must clients populate to remember the L2 addressing of their neighbors?
- A. ARP Table
- B. Routing Table
- C. MAC Table
- D. Ethernet Table
Answer: C
NEW QUESTION # 32
Refer to Exhibit.
The PCs are not able to successfully establish bidirectional communication. What change must you deploy to enable the communication between PC-1 and PC-2?
- A. change PC-2's default gateway to 172.16.31.254
- B. change the Router's 1/1/1 interface IP to 172.16.30.254
- C. change PC-1's IP address to 172.16.30.10
- D. change PC-1 's default gateway to 172.16.30.2
Answer: B
NEW QUESTION # 33
Which unit of measurement is recommended for expressing radio frequency power due to its logarithmic nature?
- A. milliwatt (mW)
- B. decibel relative to isotrope (dBi)
- C. lumens
- D. decibel relative to milliwatt (dBm)
Answer: D
Explanation:
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
NEW QUESTION # 34
Which characteristic allows switches to mitigate collisions?
- A. The switches support VLANs that segment the collision domains.
- B. The switches use L3 protocols that eliminate collisions.
- C. The switches' ports are independent collision domains.
- D. The switches have proprietary features that help eliminate collisions.
Answer: A
NEW QUESTION # 35
To which wireless device category do a hardwire desktop PC belongs?
- A. intermittent mobile devices
- B. somewhat mobile devices
- C. stationary devices
- D. highly mobile devices
Answer: D
NEW QUESTION # 36
What are characteristics of Aruba Central? (Select two.)
- A. It manages networking equipment using SNMP.
- B. It manages networking equipment using HTTPs.
- C. It is considered cloud-based network management.
- D. It must be deployed as an on-premises server.
- E. It can manage third-party networking equipment.
Answer: B,C
NEW QUESTION # 37
What is the decimal equivalent of the binary number 10001010?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
Explanation:
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
NEW QUESTION # 38
What are the differences between Local-based and Server-based management? (Select two.)
- A. server-based management cannot talk to the device's control plane, local-based can
- B. in local-based, the managed device is a client, while in server-based it is a server
- C. local-based management can use the device's console port, server-based cannot
- D. server-based management can monitor multiple devices at once, local-based cannot
- E. local-based management requires an on-premises network management appliance
Answer: C,D
Explanation:
Explanation
Local-based management refers to managing a network device directly from the device itself, using tools such as console port, web interface, or command-line interface. Server-based management refers to managing a network device remotely from a centralized server, using tools such as Windows Admin Center, System Center, or Azure Arc123. The differences between these two types of management are:
* Local-based management can use the device's console port, which is a physical connection that allows access to the device even when the network is down or the device is not configured. Server-based management cannot use the console port, as it relies on network connectivity and protocols4.
* Server-based management can monitor multiple devices at once, using a single dashboard or interface that shows the status, performance, and configuration of all the devices in the network. Local-based management can only monitor one device at a time, using the device's own tools123.
References:
1: Cloud vs Server: Learn the Key Differences and Benefits - Parallels 2: Windows Server management overview | Microsoft Learn 4: 5 Benefits of Server-Based Local Access Networks for Small ... - Versatech 3:
What is Windows Admin Center | Microsoft Learn
NEW QUESTION # 39
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 C
- B. Option D
- C. Option A
- D. Option B
Answer: B
NEW QUESTION # 40
Which statements are true about Access Points? (Select two.)
- A. They are used to interconnect wireless devices only.
- B. They only operate at Layer three of the OSI model.
- C. They use destination IP addresses to switch the packets.
- D. They offer wireless connectivity to endpoints.
- E. They bridge wireless frames to the wired network.
Answer: D,E
Explanation:
Explanation
An access point is a device that creates a wireless local area network (WLAN) by connecting wireless devices to a wired network. An access point performs two main functions: bridging and wireless connectivity.
Bridging is the process of forwarding data frames between different networks or network segments. An access point bridges wireless frames from wireless devices to the wired network, and vice versa, using the destination MAC address of the frame. This allows wireless devices to communicate with other devices on the same network or on different networks.
Wireless connectivity is the process of providing a wireless signal to wireless devices, such as laptops, smartphones, tablets, etc. An access point offers wireless connectivity to endpoints by broadcasting a service set identifier (SSID), which is the name of the wireless network. Wireless devices can scan for available SSIDs and connect to the access point by providing the correct security credentials, such as a password or a certificate.
The other statements are false because:
A: They use destination IP addresses to switch the packets. This is false because access points do not use IP addresses to switch packets. IP addresses are used at layer three of the OSI model, which is the network layer.
Access points operate at layer two of the OSI model, which is the data link layer. Access points use MAC addresses to switch frames, not packets.
C: They are used to interconnect wireless devices only. This is false because access points are not used to interconnect wireless devices only. Access points are also used to connect wireless devices to a wired network, which may contain other devices, such as routers, switches, servers, etc.
E: They only operate at Layer three of the OSI model. This is false because access points do not operate at layer three of the OSI model, which is the network layer. Access points operate at layer two of the OSI model, which is the data link layer. Access points do not use network layer protocols, such as IP, to perform their functions. References:
* What is an Access Point? - Cisco
* Access Point | What is it and how it works?IAPP specification
NEW QUESTION # 41
Refer to Exhibit.
PC-1 and PC-2 are connected to Interfaces configured as access ports on VLAN 10. All other ports on Switch-1 and Switch-2 are in default settings. Which configuration is required on Doth switches to allow inter-PC communication in the same Broadcast domain?
- A. Option D
- B. Option B
- C. Option C
- D. Option A
Answer: B
Explanation:
Explanation
In order to allow inter-PC communication in the same broadcast domain, both switches need to have the same VLAN configured on the ports that connect to the PCs and the trunk port that connects to each other. Option B shows the correct configuration for both switches, as follows:
* On Switch-1, interface 0/1 is configured as an access port on VLAN 10, which matches the VLAN of PC-1. Interface 0/2 is configured as a trunk port, which allows VLAN 10 traffic to pass through to Switch-2.
* On Switch-2, interface 0/1 is configured as an access port on VLAN 10, which matches the VLAN of PC-2. Interface 0/2 is also configured as a trunk port, which allows VLAN 10 traffic to pass through from Switch-1.
Option A is incorrect because it does not configure the trunk port on Switch-2, which prevents VLAN 10 traffic from reaching Switch-1. Option C is incorrect because it configures the trunk port on Switch-1 with the wrong encapsulation mode (ISL instead of dot1q), which causes a mismatch with Switch-2. Option D is incorrect because it configures the access ports on Switch-2 with the wrong VLAN (20 instead of 10), which isolates PC-2 from PC-1.
References:
1: Layer 2 VLAN Configuration on a Cisco Switch (with Example) - Networks Training 2: VLAN Configuration Commands Step by Step Explained - Computer Networking Notes 3: How To Configure VLANs On the Catalyst Switches - Cisco Community 4: Configure VLAN on Cisco Switch Using Cisco Packet Tracer - TECHNIG
NEW QUESTION # 42
On which connection type are collisions more likely to happen?
- A. Dark Fiber
- B. Wi-Fi
- C. Fiber
- D. Copper
Answer: B
Explanation:
Explanation
A collision occurs when two or more devices try to transmit data at the same time on a shared medium, such as a cable or a wireless channel. Collisions result in corrupted or lost data, and reduce the efficiency of the network. Different connection types have different susceptibility to collisions, depending on how they handle data transmission and collision detection.
Dark fiber and fiber are optical connections that use light to transmit data. They are immune to electromagnetic interference and have very high bandwidth. They also use full-duplex communication, which means that data can be sent and received simultaneously on separate fibers. Therefore, collisions are very unlikely to happen on dark fiber and fiber connections.
Copper is an electrical connection that uses metal wires to transmit data. It is prone to electromagnetic interference and has lower bandwidth than optical connections. It can use either half-duplex or full-duplex communication, depending on the device and the protocol. Half-duplex communication means that data can only be sent or received at a time on the same wire. Therefore, collisions are more likely to happen on copper connections that use half-duplex communication, such as Ethernet hubs.
Wi-Fi is a wireless connection that uses radio waves to transmit data. It is also prone to electromagnetic interference and has lower bandwidth than optical connections. It uses half-duplex communication, which means that data can only be sent or received at a time on the same channel. Therefore, collisions are very likely to happen on Wi-Fi connections, especially when there are many devices using the same channel or frequency.
References:
* Types of Collisions
* What are elastic and inelastic collisions?
* Why is a switch port a collision domain?
NEW QUESTION # 43
Which Wi-Fi frame announces the Service Set Identifier (SSID) to Basic Service Set Identifier (BSSID) mapping?
- A. probe request
- B. network allocation vector
- C. association request
- D. beacon
Answer: D
Explanation:
Explanation
A Wi-Fi frame is a unit of data transmission in a wireless network that follows the 802.11 standard. There are three types of Wi-Fi frames: management, control, and data. Management frames are used to establish and maintain the connection between wireless devices, such as access points (APs) and stations (STAs). Control frames are used to coordinate the access to the wireless medium and avoid collisions. Data frames are used to carry the actual information between wireless devices1 A Service Set Identifier (SSID) is a name that identifies a wireless network. A Basic Service Set Identifier (BSSID) is a unique identifier for a wireless access point within a wireless network. A BSSID is usually the MAC address of the wireless interface of the AP. An SSID can be associated with multiple BSSIDs, forming an Extended Service Set (ESS). For example, a wireless network with multiple APs can have the same SSID but different BSSIDs for each AP23 A beacon is a type of management frame that is periodically broadcasted by an AP to announce its presence and provide information about the wireless network, such as the SSID, the BSSID, the supported data rates, the security parameters, and the channel number. A beacon is used by STAs to discover and join a wireless network, as well as to synchronize their clocks with the AP. A beacon is usually sent every 100 milliseconds on a fixed interval45 Therefore, the Wi-Fi frame that announces the SSID to BSSID mapping is the beacon, as it contains both the SSID and the BSSID fields in its frame format. The other options are not correct because:
* An association request is a type of management frame that is sent by a STA to an AP to request to join a wireless network. It contains the SSID of the network that the STA wants to join, but not the BSSID of the AP. The BSSID is specified in the association response frame that is sent by the AP to the STA to accept or reject the request4
* A probe request is a type of management frame that is sent by a STA to scan for available wireless networks. It can contain the SSID of a specific network that the STA wants to join, or it can be blank to request information from all networks. It does not contain the BSSID of any AP. The BSSID is specified in the probe response frame that is sent by the AP to the STA to provide information about the network4
* A network allocation vector (NAV) is not a type of Wi-Fi frame, but a mechanism to avoid collisions in a wireless network. It is a timer that indicates how long the wireless medium will be busy for a transmission. Each Wi-Fi frame contains a duration field that specifies the NAV value for that transmission. The NAV value is updated by the wireless devices based on the duration field of the received frames. A wireless device will not transmit any frame if the NAV value is greater than zero, meaning that the medium is occupied.
References: 1: Wi-Fi Frames: A Brief Intro - Cisco Blogs 2: SSID vs BSSID: What's the Difference? - Actiontec.com 3: Difference Between BSSID and SSID | Difference Between 4: 802.11Management Frames - Tutorialspoint 5: [Beacon frame - Wikipedia] : [Association Request frame - 802.11 Wireless Networks: The Definitive Guide, 2nd Edition [Book]] : [Probe Request frame - 802.11 Wireless Networks: The Definitive Guide, 2nd Edition [Book]] : [Network Allocation Vector - an overview | ScienceDirect Topics] : [NAV (Network Allocation Vector) - GeeksforGeeks]
NEW QUESTION # 44
You are managing an ArubaOS-CX switch using the CLl. The current prompt reads "Switch(config-if>#".
Which single CLI command should you issue to move back to the Manager context?
- A. disable
- B. quit
- C. exit
- D. end
Answer: D
NEW QUESTION # 45
Which command should you enter to access the second interface of the third slot in a modular ArubaOS-CX switch?
- A. Interface 0/2/3
- B. Interface 1/3/2
- C. Interface 3/1/2
- D. Interface 0/3/2
Answer: C
NEW QUESTION # 46
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 route 0.0.0.0/0 172.16.31.254
- B. route 172.16.31.254 0.0.0.0 0.0.0.0
- C. ip routing 0/0 172.16.31.254
- D. routing 0.0.0.0/0 172.16.31.254/24
Answer: B
NEW QUESTION # 47
How many addresses does the 255.255.252.0 provide?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
Explanation:
Explanation
The subnet mask 255.255.252.0 is equivalent to the CIDR notation /22, which means that 22 bits are used for the network prefix and 10 bits are used for the host part. To calculate the number of addresses that this subnet mask provides, we can use the formula2n2, wherenis the number of bits in the host part. In this case,n=10, so the number of addresses is2102=10242=1022. The subtraction of 2 is because the first and the last addresses are reserved for the network identifier and the broadcast address, respectively. Therefore, the subnet mask
255.255.252.0 provides 1022 usable addresses for hosts, plus 2 reserved addresses, for a total of 1024 addresses.References:IP Subnet Calculator,How many host addresses are available on the network ... - ITExamAnswers
NEW QUESTION # 48
Which characteristic allows switches to mitigate collisions?
- A. The switches' ports are independent collision domains.
- B. The switches use L3 protocols that eliminate collisions.
- C. The switches support VLANs that segment the collision domains.
- D. The switches have proprietary features that help eliminate collisions.
Answer: A
Explanation:
Explanation
A collision occurs when two or more devices try to transmit data at the same time on a shared medium, such as a bus or a hub. Collisions degrade network performance and cause data loss. Switches mitigate collisions by creating separate collision domains for each port. This means that each port can transmit and receive data without interfering with other ports. Switches also use full-duplex communication, which allows simultaneous transmission and reception of data on each port, further reducing the chances of collisions. VLANs and L3 protocols do not affect collisions, as they operate at different layers of the network model. Proprietary features are not a general characteristic of switches, and may not be compatible with other vendors' switches. References: Aruba Certified Network Technician (ACNT) | HPE Aruba Networking, Aruba Documentation Portal
NEW QUESTION # 49
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Aruba Networks is a leading provider of networking solutions for enterprises worldwide. With the ArubaOS Switching and ArubaOS WLAN platforms, Aruba delivers advanced networking capabilities that provide high-speed connectivity, security, and reliability. The HP HPE3-U01 certification exam is designed to ensure that individuals who work with Aruba's networking solutions possess the knowledge and skills required to effectively manage and maintain these technologies.
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