HP HPE6-A90 Exam Dumps<\/b><\/a> and Practice Test Dumps<\/b><\/p>\n <\/p>\n
Question: 381. Which protocol is used by IPv6 devices to detect duplicate addresses before using them?<\/b><\/p>\n\n- <\/b> DHCP<\/span>
\n<\/span>2.<\/b> ARP<\/span>
\n<\/span>3.<\/b> Duplicate Address Detection<\/span>
\n<\/span>4.<\/b> SMTP<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. Duplicate Address Detection<\/span><\/p>\nExplanation:<\/b><\/p>\n
Duplicate Address Detection, or DAD, is an IPv6 Neighbor Discovery function used to determine whether an IPv6 address is already in use on the local network. Before assigning an address to an interface, an IPv6 host can send a Neighbor Solicitation message to check for another device using the same address. This helps prevent address conflicts. IPv6 does not use ARP for this function. DHCP may provide configuration, while SMTP is associated with email transmission.<\/span><\/p>\nQuestion: 382. Which device separates broadcast domains by default?<\/b><\/p>\n\n- <\/b> Hub<\/span>
\n<\/span>2.<\/b> Router<\/span>
\n<\/span>3.<\/b> Repeater<\/span>
\n<\/span>4.<\/b> Layer 1 media converter<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. Router<\/span><\/p>\nExplanation:<\/b><\/p>\n
A router separates broadcast domains because broadcast traffic received on one routed interface is not normally forwarded to another routed interface. Each routed interface represents a different Layer 3 network. Hubs and repeaters operate at lower layers and do not create separate broadcast domains. Layer 2 switches also normally form a single broadcast domain per VLAN unless VLAN segmentation is configured. Therefore, a router is the device traditionally used to separate broadcast domains.<\/span><\/p>\nQuestion: 383. Which command can display the IP configuration of a Windows host?<\/b><\/p>\n\n- <\/b> ipconfig<\/span>
\n<\/span>2.<\/b> chmod<\/span>
\n<\/span>3.<\/b> routeprint<\/span>
\n<\/span>4.<\/b> hostnamectl<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. ipconfig<\/span><\/p>\nExplanation:<\/b><\/p>\n
The Windows <\/span>ipconfig<\/span> command displays IP configuration information for network interfaces. Depending on the options used, it can show IPv4 and IPv6 addresses, subnet masks, default gateways, DNS-related information, and DHCP details. It is commonly used during network troubleshooting to verify whether a host has received the expected configuration. Other commands may perform different administrative functions, but <\/span>ipconfig<\/span> is the standard Windows command for viewing basic IP configuration information.<\/span><\/p>\nQuestion: 384. Which IPv4 address class traditionally contains addresses beginning with values from 1 through 126 in the first octet?<\/b><\/p>\n\n- <\/b> Class D<\/span>
\n<\/span>2.<\/b> Class C<\/span>
\n<\/span>3.<\/b> Class A<\/span>
\n<\/span>4.<\/b> Class B<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. Class A<\/span><\/p>\nExplanation:<\/b><\/p>\n
In the historical classful IPv4 addressing system, Class A addresses used first-octet values from 1 through 126. Class B traditionally covered 128 through 191, Class C covered 192 through 223, and Class D was reserved for multicast. Although modern IPv4 networks use CIDR rather than relying on these historical classes for routing, the classful categories remain relevant when studying networking fundamentals. Therefore, the traditional Class A range begins with first-octet values from 1 through 126.<\/span><\/p>\nQuestion: 385. What is the main purpose of a DNS A record?<\/b><\/p>\n\n- <\/b> Map a hostname to an IPv4 address<\/span>
\n<\/span>2.<\/b> Map an IPv6 address to a hostname<\/span>
\n<\/span>3.<\/b> Identify a mail server<\/span>
\n<\/span>4.<\/b> Specify a VLAN ID<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. Map a hostname to an IPv4 address<\/span><\/p>\nExplanation:<\/b><\/p>\n
A DNS A record associates a hostname with an IPv4 address. When a client queries DNS for a hostname that has an A record, the DNS response can provide the corresponding IPv4 address so the client can establish communication. An AAAA record is used for IPv6 addresses, while MX records identify mail-exchange servers. VLAN IDs are unrelated to DNS records. Therefore, the A record is specifically used to map a hostname to an IPv4 address.<\/span><\/p>\nQuestion: 386. Which protocol provides centralized authentication, authorization, and accounting services for network access?<\/b><\/p>\n\n- <\/b> RADIUS<\/span>
\n<\/span>2.<\/b> ARP<\/span>
\n<\/span>3.<\/b> ICMP<\/span>
\n<\/span>4.<\/b> TFTP<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. RADIUS<\/span><\/p>\nExplanation:<\/b><\/p>\n
RADIUS, or Remote Authentication Dial-In User Service, provides centralized authentication, authorization, and accounting capabilities. It is commonly used for network access services such as wireless authentication, VPN access, and administrative login environments. A centralized authentication server can validate user credentials and return authorization information to the requesting network device. ARP handles IPv4 address resolution, ICMP provides network control messages, and TFTP provides simple file transfer. Therefore, RADIUS is the protocol associated with centralized AAA services in many network environments.<\/span><\/p>\nQuestion: 387. Which IPv6 prefix identifies link-local addresses?<\/b><\/p>\n\n- <\/b> 2000::\/3<\/span>
\n<\/span>2.<\/b> FE80::\/10<\/span>
\n<\/span>3.<\/b> FF00::\/8<\/span>
\n<\/span>4.<\/b> FC00::\/7<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. <\/span>FE80::\/10<\/span><\/p>\nExplanation:<\/b><\/p>\n
IPv6 link-local addresses use the <\/span>FE80::\/10<\/span> prefix. These addresses are intended for communication on the local network link and are not routed beyond that link. They are important for Neighbor Discovery and other local IPv6 operations. The <\/span>2000::\/3<\/span> range is associated with global unicast addressing, <\/span>FF00::\/8<\/span> is the multicast range, and <\/span>FC00::\/7<\/span> is associated with unique local addresses. Therefore, <\/span>FE80::\/10<\/span> is the correct prefix for IPv6 link-local addresses.<\/span><\/p>\nQuestion: 388. Which feature allows a network administrator to prioritize certain types of traffic over less time-sensitive traffic?<\/b><\/p>\n\n- <\/b> QoS<\/span>
\n<\/span>2.<\/b> NAT<\/span>
\n<\/span>3.<\/b> ARP<\/span>
\n<\/span>4.<\/b> DHCP<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. QoS<\/span><\/p>\nExplanation:<\/b><\/p>\n
Quality of Service, or QoS, provides mechanisms for classifying, prioritizing, queuing, and managing network traffic. It can be especially useful for applications such as voice and video that are sensitive to delay, jitter, and packet loss. QoS policies can prioritize important traffic when network resources are congested. NAT translates addresses, ARP performs IPv4-to-MAC resolution, and DHCP provides host configuration. Therefore, QoS is the technology used to manage traffic priority and improve predictable application performance.<\/span><\/p>\nQuestion: 389. Which IPv4 prefix represents a network containing 16 addresses?<\/b><\/p>\n\n- <\/b> \/24<\/span>
\n<\/span>2.<\/b> \/30<\/span>
\n<\/span>3.<\/b> \/28<\/span>
\n<\/span>4.<\/b> \/27<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. <\/span>\/28<\/span><\/p>\nExplanation:<\/b><\/p>\n
An IPv4 <\/span>\/28<\/span> network contains 16 total addresses because there are 4 host bits remaining, and <\/span>2^4 = 16<\/span>. In a traditional subnet, some addresses are reserved for the network and broadcast addresses, leaving 14 normally usable host addresses. A <\/span>\/30<\/span> contains 4 total addresses, a <\/span>\/27<\/span> contains 32, and a <\/span>\/24<\/span> contains 256. Understanding the relationship between prefix length and address count is essential for IPv4 subnetting and address planning.<\/span><\/p>\nQuestion: 390. Which protocol is commonly used to automatically discover neighboring network devices on HPE networking equipment and other standards-compliant devices?<\/b><\/p>\n\n- <\/b> LLDP<\/span>
\n<\/span>2.<\/b> SMTP<\/span>
\n<\/span>3.<\/b> FTP<\/span>
\n<\/span>4.<\/b> POP3<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. LLDP<\/span><\/p>\nExplanation:<\/b><\/p>\n
LLDP, or Link Layer Discovery Protocol, allows network devices to advertise and learn information about directly connected neighbors. It can provide details such as device identity, port information, system capabilities, and management information. This is useful for documenting topology and troubleshooting physical connections. Because LLDP is a standards-based protocol, it can operate between devices from different vendors when both support it. SMTP, FTP, and POP3 are application-layer protocols unrelated to Layer 2 neighbor discovery.<\/span><\/p>\nQuestion: 391. What happens when a router receives a packet whose destination matches no specific routing-table entry and no default route exists?<\/b><\/p>\n\n- <\/b> It forwards the packet to every interface<\/span>
\n<\/span>2.<\/b> It normally discards the packet<\/span>
\n<\/span>3.<\/b> It converts the packet to a broadcast<\/span>
\n<\/span>4.<\/b> It sends it to the DNS server<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. It normally discards the packet<\/span><\/p>\nExplanation:<\/b><\/p>\n
If a router cannot find a matching route for a packet’s destination and there is no default route available, it normally has no valid forwarding path. The router therefore discards the packet. Depending on the circumstances and configuration, it may send an ICMP Destination Unreachable message back toward the source. A router does not normally broadcast an unroutable packet through all interfaces or forward it to a DNS server. Understanding this behavior is useful when diagnosing missing routes and connectivity failures.<\/span><\/p>\nQuestion: 392. Which protocol is commonly used to provide secure web communication?<\/b><\/p>\n\n- <\/b>