HP HPE6-A90 Exam Dumps<\/b><\/a> and Practice Test Dumps<\/b><\/p>\n <\/p>\n
Question: 341. Which protocol is commonly used by IPv6 hosts to discover routers on their local network?<\/b><\/p>\n\n- <\/b> SMTP<\/span>
\n<\/span>2.<\/b> ICMPv6<\/span>
\n<\/span>3.<\/b> FTP<\/span>
\n<\/span>4.<\/b> SNMP<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. ICMPv6<\/span><\/p>\nExplanation:<\/b><\/p>\n
IPv6 uses ICMPv6 as part of its Neighbor Discovery Protocol suite. Router Solicitation and Router Advertisement messages allow hosts and routers to discover each other and exchange important network configuration information. A host can send a Router Solicitation message when it needs router information, while routers can respond with Router Advertisement messages. SMTP is used for email, FTP for file transfer, and SNMP for network management. Therefore, ICMPv6 provides the messaging framework used by IPv6 hosts for local router discovery.<\/span><\/p>\nQuestion: 342. Which switch port mode is normally used to carry traffic for multiple VLANs?<\/b><\/p>\n\n- <\/b> Access mode<\/span>
\n<\/span>2.<\/b> Disabled mode<\/span>
\n<\/span>3.<\/b> Trunk mode<\/span>
\n<\/span>4.<\/b> Loopback mode<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. Trunk mode<\/span><\/p>\nExplanation:<\/b><\/p>\n
A trunk port is designed to carry traffic belonging to multiple VLANs across a single physical link. VLAN tagging, commonly using IEEE 802.1Q, allows the receiving switch to identify which VLAN each frame belongs to. Access ports normally carry traffic for a single VLAN and are commonly connected to end devices. Trunk connections are frequently used between switches and between switches and Layer 3 devices. Therefore, trunk mode is the appropriate port mode when multiple VLANs must traverse the same link.<\/span><\/p>\nQuestion: 343. Which command is commonly used to test DNS name resolution from a command line?<\/b><\/p>\n\n- <\/b> nslookup<\/span>
\n<\/span>2.<\/b> ping -t<\/span>
\n<\/span>3.<\/b> netstat<\/span>
\n<\/span>4.<\/b> arp -a<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. nslookup<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>nslookup<\/span> utility is commonly used to query DNS servers and troubleshoot name-resolution problems. It can show the IP address associated with a hostname and can also be used to query specific DNS servers. <\/span>ping<\/span> primarily tests IP reachability, <\/span>netstat<\/span> displays network connections and related information, and <\/span>arp -a<\/span> displays the local ARP cache on supported systems. When the primary troubleshooting question is whether a hostname resolves correctly through DNS, <\/span>nslookup<\/span> is an appropriate command-line tool.<\/span><\/p>\nQuestion: 344. Which IEEE standard defines VLAN tagging for Ethernet frames?<\/b><\/p>\n\n- <\/b> IEEE 802.11<\/span>
\n<\/span>2.<\/b> IEEE 802.3af<\/span>
\n<\/span>3.<\/b> IEEE 802.1Q<\/span>
\n<\/span>4.<\/b> IEEE 802.3u<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. IEEE 802.1Q<\/span><\/p>\nExplanation:<\/b><\/p>\n
IEEE 802.1Q defines the standard VLAN tagging mechanism used with Ethernet frames. The tag contains information that allows network devices to identify the VLAN associated with a frame when multiple VLANs share a trunk link. IEEE 802.11 covers wireless LAN technologies, IEEE 802.3af defines an early Power over Ethernet standard, and IEEE 802.3u is associated with Fast Ethernet. Therefore, IEEE 802.1Q is the standard most directly associated with VLAN tagging.<\/span><\/p>\nQuestion: 345. Which IPv4 address range is reserved for private Class A addressing?<\/b><\/p>\n\n- <\/b> 172.16.0.0\/12<\/span>
\n<\/span>2.<\/b> 192.168.0.0\/16<\/span>
\n<\/span>3.<\/b> 100.64.0.0\/10<\/span>
\n<\/span>4.<\/b> 10.0.0.0\/8<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 4. 10.0.0.0\/8<\/span><\/p>\nExplanation:<\/b><\/p>\n
The IPv4 private address ranges defined by RFC 1918 are <\/span>10.0.0.0\/8<\/span>, <\/span>172.16.0.0\/12<\/span>, and <\/span>192.168.0.0\/16<\/span>. The <\/span>10.0.0.0\/8<\/span> range corresponds to the traditional Class A private address space. These addresses are intended for use inside private networks and are not directly routable across the public Internet. The <\/span>172.16.0.0\/12<\/span> and <\/span>192.168.0.0\/16<\/span> ranges are also private, while <\/span>100.64.0.0\/10<\/span> is associated with carrier-grade NAT address space.<\/span><\/p>\nQuestion: 346. What is the primary purpose of an access control list on a network device?<\/b><\/p>\n\n- <\/b> Filter traffic according to defined criteria<\/span>
\n<\/span>2.<\/b> Synchronize device clocks<\/span>
\n<\/span>3.<\/b> Assign MAC addresses<\/span>
\n<\/span>4.<\/b> Compress Ethernet frames<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. Filter traffic according to defined criteria<\/span><\/p>\nExplanation:<\/b><\/p>\n
An access control list, or ACL, contains rules that determine whether specified traffic should be permitted or denied. Depending on the device and configuration, ACLs can examine information such as source and destination IP addresses, protocols, ports, and other packet characteristics. ACLs are commonly used to restrict unwanted traffic and control access to network resources. They do not synchronize clocks, assign MAC addresses, or compress Ethernet frames. Properly designed ACLs provide an important mechanism for enforcing network security and traffic-control policies.<\/span><\/p>\nQuestion: 347. Which IPv4 address is commonly used as the limited broadcast address?<\/b><\/p>\n\n- <\/b> 224.0.0.1<\/span>
\n<\/span>2.<\/b> 255.255.255.255<\/span>
\n<\/span>3.<\/b> 127.0.0.1<\/span>
\n<\/span>4.<\/b> 169.254.255.255<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. 255.255.255.255<\/span><\/p>\nExplanation:<\/b><\/p>\n
255.255.255.255<\/span> is the IPv4 limited broadcast address. A packet sent to this address is intended for all IPv4 hosts on the local network segment and is not routed by IPv4 routers. <\/span>224.0.0.1<\/span> is an IPv4 multicast address for all hosts on a local subnet, <\/span>127.0.0.1<\/span> is the loopback address, and <\/span>169.254.255.255<\/span> falls within the link-local address range. Understanding broadcast and multicast addressing is important when analyzing Layer 3 traffic behavior.<\/span><\/p>\nQuestion: 348. Which technology allows a switch to provide power to compatible network devices over Ethernet cabling?<\/b><\/p>\n\n- <\/b> PoE<\/span>
\n<\/span>2.<\/b> STP<\/span>
\n<\/span>3.<\/b> NAT<\/span>
\n<\/span>4.<\/b> VLAN<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. PoE<\/span><\/p>\nExplanation:<\/b><\/p>\n
Power over Ethernet, or PoE, allows compatible network devices to receive electrical power through Ethernet cabling in addition to network connectivity. PoE can be used with devices such as wireless access points, IP phones, and certain network cameras. This can simplify installations because a separate electrical power cable may not be required at the device location. STP is used to prevent Layer 2 loops, NAT translates addresses, and VLANs provide logical network segmentation. Therefore, PoE is the technology specifically associated with delivering power over Ethernet.<\/span><\/p>\nQuestion: 349. Which routing protocol is classified as a link-state interior gateway protocol?<\/b><\/p>\n\n- <\/b> RIP<\/span>
\n<\/span>2.<\/b> OSPF<\/span>
\n<\/span>3.<\/b> FTP<\/span>
\n<\/span>4.<\/b> DHCP<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. OSPF<\/span><\/p>\nExplanation:<\/b><\/p>\n
OSPF, or Open Shortest Path First, is a link-state interior gateway routing protocol. OSPF routers exchange information about network links and use that information to build a topology database. They then calculate routes using the Shortest Path First algorithm. RIP is a distance-vector routing protocol, while FTP and DHCP are application-layer services rather than routing protocols. OSPF is widely used in enterprise networks because it supports hierarchical design, rapid convergence, and scalable routing through areas.<\/span><\/p>\nQuestion: 350. What does the TTL field in an IPv4 packet help prevent?<\/b><\/p>\n\n- <\/b> DNS queries<\/span>
\n<\/span>2.<\/b> MAC address duplication<\/span>
\n<\/span>3.<\/b> Packets circulating indefinitely through routing loops<\/span>
\n<\/span>4.<\/b> Unauthorized wireless access<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. Packets circulating indefinitely through routing loops<\/span><\/p>\nExplanation:<\/b><\/p>\n
The IPv4 Time to Live, or TTL, field limits how long a packet can remain in a routed network. Each router that forwards the packet decreases the TTL value. If the value reaches zero, the router discards the packet and normally sends an ICMP Time Exceeded message to the source. This mechanism helps prevent packets from circulating indefinitely when a routing loop exists. TTL does not provide wireless security, perform DNS resolution, or prevent MAC address duplication.<\/span><\/p>\nQuestion: 351. Which wireless standard operates in both the 2.4 GHz and 5 GHz frequency bands?<\/b><\/p>\n\n- <\/b> 802.11a<\/span>
\n<\/span>2.<\/b> 802.11b<\/span>
\n<\/span>3.<\/b> 802.11g<\/span>
\n<\/span>4.<\/b> 802.11n<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 4. 802.11n<\/span><\/p>\nExplanation:<\/b><\/p>\n
IEEE 802.11n can operate in both the 2.4 GHz and 5 GHz frequency bands, depending on the implementation and configuration. This flexibility helped 802.11n provide better deployment options than standards restricted to one band. 802.11a operates in the 5 GHz band, while 802.11b and 802.11g are primarily associated with the 2.4 GHz band. Wireless deployments should consider channel availability, interference, client capabilities, and environmental conditions when selecting a frequency band.<\/span><\/p>\n