HP HPE3-U01 Exam With Confidence Using Practice Dumps

The header in the exhibit belongs to the User Datagram Protocol (UDP), which is a transport layer protocol that provides connectionless and unreliable data delivery. UDP header consists of four fields: Source Port, Destination Port, Length, and Checksum. The Source Port and Destination Port fields identify the endpoints of the communication, and are 16 bits each. The Length field specifies the total length of the UDP datagram, including the header and the data, and is also 16 bits. The Checksum field is used to verify the integrity of the UDP datagram, and is optional in IPv4 but mandatory in IPv6. The Checksum field is also 16 bits.

The other options are incorrect because:

B. Transmission Control Protocol (TCP) is another transport layer protocol that provides connection-oriented and reliable data delivery. TCP header has more fields than UDP header, such as Sequence Number, Acknowledgment Number, Window Size, etc. TCP header is at least 20 bytes long, while UDP header is only 8 bytes long.

C. 802.11 Wi-Fi is a set of standards for wireless local area networks (WLANs). 802.11 Wi-Fi header is different from UDP header, as it contains fields such as Frame Control, Duration, Address 1, Address 2, Address 3, etc. 802.11 Wi-Fi header is at least 24 bytes long, while UDP header is only 8 bytes long.

D. Ethernet Protocol is a data link layer protocol that defines the physical and logical characteristics of a wired network. Ethernet header is different from UDP header, as it contains fields such as Destination MAC Address, Source MAC Address, EtherType, etc. Ethernet header is 14 bytes long, while UDP header is 8 bytes long.

E. Internet Protocol (IP) is a network layer protocol that provides logical addressing and routing for data packets. IP header is different from UDP header, as it contains fields such as Version, Internet Header Length, Type of Service, Total Length, Identification, Flags, Fragment Offset, Time to Live, Protocol, Header Checksum, Source IP Address, Destination IP Address, etc. IP header is at least 20 bytes long, while UDP header is 8 bytes long. References:

• Aruba Certified Network Technician (ACNT) | HPE Aruba Networking
• User Datagram Protocol - Wikipedia
• Transmission Control Protocol - Wikipedia
• IEEE 802.11 - Wikipedia
• Ethernet frame - Wikipedia
• [IP header - Wikipedia]

An omnidirectional antenna is an antenna that radiates almost equal power in all directions in the horizontal plane, which is also called the azimuth plane1. This means that the antenna has a 360-degree coverage in the horizontal plane, but a narrow coverage in the vertical plane, which is also called the elevation plane2. An omnidirectional antenna is suitable for indoor environments where the clients are distributed around the access point3. Therefore, statement D accurately describes an omnidirectional antenna. Statements A, B, and C are incorrect because they describe different types of antennas. Statement A describes an isotropic antenna, which is a theoretical antenna that radiates equal power in all directions in both the horizontal and vertical planes. Statement B describes a vertical antenna, which is an antenna that radiates almost equal power in all directions in the vertical plane, but a narrow coverage in the horizontal plane. Statement C describes a directional antenna, which is an antenna that radiates more power in a specific angle and less power in others, creating a focused beam of radio waves. References: 1: Aruba Certified Network Technician (ACNT) Study Guide, page 872: Aruba Certified Network Technician (ACNT) Study Guide, page 883: Aruba Certified Network Technician (ACNT) Study Guide, page 89. : Aruba Certified Network Technician (ACNT) Study Guide, page 87. : Aruba Certified Network Technician (ACNT) Study Guide, page 88. : Aruba Certified Network Technician (ACNT) Study Guide, page 89.

Layer 2 encapsulation is the process of adding a header and a trailer to the data coming from the upper layer (Layer 3) before sending it over the physical medium. The header and the trailer contain information such as source and destination MAC addresses, error detection, and protocol type. The devices that perform Layer 2 encapsulation are usually switches, bridges, or network interface cards (NICs). In the given network diagram, the PC is sending a message to the server. The PC first adds a Layer 2 header and trailer to the data and sends it to Switch-1. Switch-1 performs Layer 2 encapsulation again before forwarding it to the router. The router operates at Layer 3 and does not perform Layer 2 encapsulation. It only removes the Layer 2 header and trailer, checks the destination IP address, and forwards the packet to the next hop. The packet then reaches Switch-2, where Layer 2 encapsulation occurs again before it is sent to the server. The server also performs Layer 2 de-encapsulation by removing the header and trailer and passing the data to the upper layer. Therefore, the devices that have performed Layer 2 encapsulation by the time the message arrives at the server are Switch-1 and Switch-2. References: Understanding Data Link Layer Encapsulation, How Data Encapsulation & De-encapsulation Works?, HDLC Protocol and Encapsulation method Explained