HP HPE6-A90 Exam Dumps<\/b><\/a> and Practice Test Dumps<\/b><\/p>\n <\/p>\n
Question: 221. Which network protocol is primarily used to synchronize the clocks of network devices?<\/b><\/p>\n\n- <\/b> FTP<\/span>
\n<\/span>2.<\/b> NTP<\/span>
\n<\/span>3.<\/b> SMTP<\/span>
\n<\/span>4.<\/b> TFTP<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. NTP<\/span><\/p>\nExplanation:<\/b><\/p>\n
NTP, or Network Time Protocol, synchronizes the clocks of network devices with a common time reference. Accurate time synchronization is important for network troubleshooting, security logging, authentication, event correlation, and monitoring. When devices use synchronized timestamps, administrators can more easily determine the sequence of events across multiple systems. NTP typically communicates over UDP port 123 and can synchronize devices with internal or external time sources. Other listed protocols have different purposes: FTP transfers files, SMTP handles email transmission, and TFTP provides simple file transfers. Therefore, NTP is the appropriate protocol for maintaining consistent time across network infrastructure.<\/span><\/p>\nQuestion: 222. What is the primary purpose of a default gateway on an IPv4 host?<\/b><\/p>\n\n- <\/b> To provide DNS name resolution<\/span>
\n<\/span>2.<\/b> To assign the host an IP address<\/span>
\n<\/span>3.<\/b> To identify the host’s MAC address<\/span>
\n<\/span>4.<\/b> To forward traffic destined for remote networks<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 4. To forward traffic destined for remote networks<\/span><\/p>\nExplanation:<\/b><\/p>\n
A default gateway provides the path a host uses to reach destinations outside its local IP subnet. When a host determines that the destination IP address is not on its local network, it sends the traffic to the configured default gateway, normally a router or Layer 3 switch. The gateway then determines how to forward the packet toward the destination network. DNS resolves names to IP addresses, DHCP commonly assigns IP configuration, and ARP can resolve local IPv4 addresses to MAC addresses. Therefore, forwarding traffic toward remote networks is the primary purpose of a default gateway.<\/span><\/p>\nQuestion: 223. Which device feature allows a switch to place ports into separate logical broadcast domains?<\/b><\/p>\n\n- <\/b> VLAN configuration<\/span>
\n<\/span>2.<\/b> Port mirroring<\/span>
\n<\/span>3.<\/b> Link aggregation<\/span>
\n<\/span>4.<\/b> Spanning Tree Protocol<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. VLAN configuration<\/span><\/p>\nExplanation:<\/b><\/p>\n
VLANs, or Virtual Local Area Networks, logically divide a physical switched network into separate broadcast domains. Ports assigned to different VLANs are isolated at Layer 2, meaning broadcasts from one VLAN do not normally propagate into another VLAN. Communication between VLANs requires Layer 3 routing, typically performed by a router or Layer 3 switch. Port mirroring is used for traffic monitoring, link aggregation combines multiple physical links, and Spanning Tree Protocol helps prevent Layer 2 loops. Therefore, configuring VLANs is the feature that allows a switch to create separate logical broadcast domains.<\/span><\/p>\nQuestion: 224. Which IPv4 address range is reserved for private networks?<\/b><\/p>\n\n- <\/b> 11.0.0.0\/8<\/span>
\n<\/span>2.<\/b> 169.254.0.0\/16<\/span>
\n<\/span>3.<\/b> 192.168.0.0\/16<\/span>
\n<\/span>4.<\/b> 224.0.0.0\/4<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. 192.168.0.0\/16<\/span><\/p>\nExplanation:<\/b><\/p>\n
The IPv4 range 192.168.0.0\/16 is one of the three address ranges reserved for private network use. It includes addresses from 192.168.0.0 through 192.168.255.255 and is commonly used in homes, offices, and internal enterprise networks. The other private IPv4 ranges are 10.0.0.0\/8 and 172.16.0.0\/12. Addresses in the 169.254.0.0\/16 range are commonly used for link-local addressing, while 224.0.0.0\/4 is reserved for IPv4 multicast. Private addresses are not directly routable across the public Internet and often use NAT to access external networks.<\/span><\/p>\nQuestion: 225. What does the acronym MTU represent in networking?<\/b><\/p>\n\n- <\/b> Maximum Transfer Utility<\/span>
\n<\/span>2.<\/b> Maximum Transmission Unit<\/span>
\n<\/span>3.<\/b> Managed Traffic Utility<\/span>
\n<\/span>4.<\/b> Minimum Transmission Usage<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. Maximum Transmission Unit<\/span><\/p>\nMTU stands for Maximum Transmission Unit. It defines the largest packet size that can normally be transmitted across a particular network link without fragmentation at that Layer 2 technology. Ethernet commonly uses an MTU of 1500 bytes for the IP payload. If a packet is larger than the supported MTU and fragmentation is permitted, it may be divided into smaller pieces. Incorrect MTU settings can cause connectivity problems, particularly when applications or tunnels require larger packets. Understanding MTU is therefore important when troubleshooting packet fragmentation, VPN connectivity, and certain path-related network issues.<\/span><\/p>\nQuestion: 226. Which protocol is commonly used to securely access a remote network device through a command-line interface?<\/b><\/p>\n\n- <\/b> SSH<\/span>
\n<\/span>2.<\/b> Telnet<\/span>
\n<\/span>3.<\/b> HTTP<\/span>
\n<\/span>4.<\/b> TFTP<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. SSH<\/span><\/p>\nSSH, or Secure Shell, provides encrypted remote command-line access to network devices and servers. It protects administrative credentials and session data from being transmitted in clear text. Telnet can also provide remote command-line access, but it does not provide the same encryption and is therefore unsuitable for secure administrative access in modern networks. HTTP is primarily used for web-based communication, while TFTP is designed for simple file transfers. Network administrators commonly use SSH to securely configure switches, routers, firewalls, and other infrastructure devices.<\/span><\/p>\nQuestion: 227. What is the main function of ARP in an IPv4 Ethernet network?<\/b><\/p>\n\n- <\/b> Assign IPv4 addresses dynamically<\/span>
\n<\/span>2.<\/b> Encrypt Ethernet frames<\/span>
\n<\/span>3.<\/b> Resolve an IPv4 address to a MAC address<\/span>
\n<\/span>4.<\/b> Determine the shortest Layer 3 route<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. Resolve an IPv4 address to a MAC address<\/span><\/p>\nARP, or Address Resolution Protocol, allows an IPv4 host to determine the MAC address associated with a known IPv4 address on the local network. When a device needs to send an Ethernet frame to another local IPv4 host, it can use an ARP request to ask which device owns a particular IP address. The corresponding device responds with its MAC address, which can then be stored in the sender’s ARP cache. DHCP assigns IP configuration, encryption protects data, and routing protocols determine Layer 3 paths. Therefore, resolving IPv4 addresses to MAC addresses is ARP’s primary function.<\/span><\/p>\nQuestion: 228. Which wireless security standard introduced stronger protection than WPA2 by using the Simultaneous Authentication of Equals mechanism?<\/b><\/p>\n\n- <\/b> WEP<\/span>
\n<\/span>2.<\/b> WPA<\/span>
\n<\/span>3.<\/b> WPA2<\/span>
\n<\/span>4.<\/b> WPA3<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 4. WPA3<\/span><\/p>\nWPA3 introduced stronger wireless security mechanisms compared with earlier standards. For WPA3-Personal, the authentication process uses Simultaneous Authentication of Equals (SAE), which replaces the traditional WPA2-PSK authentication approach. SAE improves protection against certain password-guessing attacks and provides stronger authentication characteristics. WEP is an outdated wireless security protocol, WPA is an older standard, and WPA2 does not use SAE as its standard personal authentication mechanism. Therefore, WPA3 is the wireless security standard associated with SAE-based authentication for WPA3-Personal networks.<\/span><\/p>\nQuestion: 229. What is the purpose of a trunk port on an Ethernet switch?<\/b><\/p>\n\n- <\/b> To carry traffic for multiple VLANs<\/span>
\n<\/span>2.<\/b> To provide power to wireless clients<\/span>
\n<\/span>3.<\/b> To disable VLAN tagging<\/span>
\n<\/span>4.<\/b> To connect only one untagged VLAN<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. To carry traffic for multiple VLANs<\/span><\/p>\nA trunk port carries traffic belonging to multiple VLANs across a single physical connection. VLAN tagging, commonly using IEEE 802.1Q, allows the receiving switch or network device to identify which VLAN each frame belongs to. Trunk links are commonly used between switches and between switches and Layer 3 devices that support multiple VLAN interfaces. An access port normally connects an endpoint to a single VLAN. Therefore, carrying traffic for multiple VLANs is the primary purpose of a trunk port.<\/span><\/p>\nQuestion: 230. Which command-line utility is commonly used to test basic IP connectivity to a destination?<\/b><\/p>\n\n- <\/b> nslookup<\/span>
\n<\/span>2.<\/b> ping<\/span>
\n<\/span>3.<\/b> netstat<\/span>
\n<\/span>4.<\/b> arp<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. ping<\/span><\/p>\nThe ping utility is commonly used to test basic IP connectivity between a source device and a destination. It sends ICMP Echo Request messages and checks whether corresponding Echo Reply messages are received. Successful replies provide evidence that the destination is reachable at the IP layer, although they do not prove that every application or service is functioning correctly. nslookup is primarily used for DNS queries, netstat displays network connection information, and arp displays or manages ARP information. Therefore, ping is the standard basic utility for testing IP reachability.<\/span><\/p>\nQuestion: 231. What is the primary purpose of Spanning Tree Protocol in a switched network?<\/b><\/p>\n\n- <\/b> Assign IP addresses to clients<\/span>
\n<\/span>2.<\/b> Encrypt Layer 2 traffic<\/span>
\n<\/span>3.<\/b> Prevent Layer 2 switching loops<\/span>
\n<\/span>4.<\/b> Increase the MTU of Ethernet links<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. Prevent Layer 2 switching loops<\/span><\/p>\nSpanning Tree Protocol, or STP, prevents Layer 2 switching loops in Ethernet networks that contain redundant paths. Without loop prevention, redundant links can create broadcast storms, duplicate frames, and MAC address instability. STP logically blocks selected redundant paths while keeping them available as alternatives if an active path fails. It does not assign IP addresses, encrypt traffic, or modify Ethernet MTU values. By maintaining a loop-free Layer 2 topology while preserving redundancy, STP helps improve network stability and availability.<\/span><\/p>\nQuestion: 232. Which DNS record type maps a hostname directly to an IPv4 address?<\/b><\/p>\n\n- <\/b> MX<\/span>
\n<\/span>2.<\/b> AAAA<\/span>
\n<\/span>3.<\/b> CNAME<\/span>
\n<\/span>4.<\/b> A<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 4. A<\/span><\/p>\nAn A record maps a DNS hostname to an IPv4 address. For example, a hostname such as server.example.com can have an A record pointing to an IPv4 address. An AAAA record performs a similar function for IPv6 addresses. An MX record identifies mail servers responsible for a domain, while a CNAME creates an alias pointing to another hostname. DNS records allow clients to locate services using human-readable names instead of requiring users to remember numerical IP addresses. Therefore, the A record is the correct DNS record type for IPv4 hostname resolution.<\/span><\/p>\nQuestion: 233. What is the primary purpose of network segmentation?<\/b><\/p>\n\n- <\/b> To increase the number of broadcast domains and isolate traffic<\/span>
\n<\/span>2.<\/b> To eliminate the need for routing<\/span>
\n<\/span>3.<\/b>