Aruba Certified Network Technician Exam HPE3-U01 Exam Questions
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How many IP assignable addresses are contained in 10.0.128.0/23?
Correct Answer: C
The IP address 10.0.128.0/23 is a Class A private address with a subnet mask of 255.255.254.0. This means that the network prefix is 10.0.128.0 and the host identifier is the last 9 bits of the address. To find the number of IP assignable addresses, we need to subtract 2 from the total number of possible hosts, which is 29 = 512 . This is because the network address (10.0.128.0) and the broadcast address (10.0.129.255) are reserved and cannot be assigned to any host. Therefore, the number of IP assignable addresses is 512 - 2 = 510. References: IP Subnet Calculator , CIDR Calculator for IPv4 addresses , Free online IPv4 subnet calculator
What are characteristics of Aruba Central? (Select two.)
Correct Answer: C, E
Aruba Central is a cloud-based networking solution that offers simplicity, security, and scalability for managing Aruba network infrastructure. It uses HTTPs to communicate with networking equipment such as wireless, wired, VPN, and SD-WAN devices. It also provides AI-powered insights, workflow automation, and advanced security features to unify operations across campus, branch, data center, and remote work environments. Aruba Central does not require an on-premises server, nor does it use SNMP for management. It also does not support third-party networking equipment, as it is designed for Aruba ESP (Edge Services Platform). References: Aruba Central for Cloud-managed networking , About Aruba Central , Aruba Central data sheet
Which protocol provides frame delivery using physical addressing and error detection using frame check sequence?
Correct Answer: B
Ethernet is a protocol that provides frame delivery using physical addressing and error detection using frame check sequence. Ethernet frames have a source and destination MAC address that identify the physical devices on the network. Ethernet frames also have a frame check sequence (FCS) field that uses a cyclic redundancy check (CRC) to detect errors in the frame. If the receiver calculates a different FCS value than the one in the frame, it discards the frame and may request a retransmission. Link Layer Discovery Protocol (LLDP) is a protocol that allows devices to discover and advertise information about themselves and their neighbors. TCP/IP is a suite of protocols that operate at the network and transport layers, not the data link layer. User Datagram Protocol (UDP) is a transport layer protocol that provides connectionless and unreliable data delivery, without error detection or correction. References: Ethernet Frame Format - Aruba , Frame check sequence - Wikipedia
What are the key differences between L2 switches and routers? (Select two.)
Correct Answer: B, D
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.
Which traffic type is used for one-to-one communication?
Correct Answer: C
Unicast is a type of data transmission where a message is sent from one sender to one receiver, each identified by a network address. Unicast is a one-to-one communication, as opposed to broadcast and multicast, which are one-to-many communications. Unicast is typically used for real-time data streams, such as video, audio, or online presentations, that are shared with a single user over the Internet. Unicast can also be used for email, file transfer, and other applications that require a specific recipient. References: Unicast - Wikipedia , Difference between Unicast, Broadcast and Multicast in Computer Network - GeeksforGeeks , Unicast Definition - TechTerms.com