View Full HP HPE6-A85 Exam Dumps and Practice Test Dumps.

Question 41. Which IPv6 address type is designed for communication with the nearest member of a group of devices providing the same service?

1. Multicast address
2. Global unicast address
3. Link-local address
4. Anycast address

Correct Answer: 4. Anycast address

Explanation:

An anycast address is assigned to multiple IPv6 interfaces, and packets sent to that address are delivered to the topologically nearest interface according to the routing system. Anycast is useful when several devices provide the same service and the network should direct a client toward an appropriate nearby instance. This differs from multicast, where traffic is delivered to multiple interested receivers simultaneously. A global unicast address identifies an individual IPv6 interface for routable communication, while a link-local address is intended for communication on the local link and is not routed between IPv6 subnets. Understanding these address types is important for IPv6 network design and troubleshooting.

Question 42. Which IPv6 address range is used for link-local communication?

1. FE80::/10
2. 2000::/3
3. FF00::/8
4. FC00::/7

Correct Answer: 1. FE80::/10

Explanation:

IPv6 link-local addresses use the FE80::/10 prefix. They are automatically generated or configured on IPv6 interfaces and are intended for communication with devices on the same local Layer 2 link. Routers do not normally forward link-local traffic between different links. Link-local addresses are particularly important for IPv6 neighbor discovery and routing protocols because many IPv6 control-plane functions use them. The 2000::/3 range is associated with global unicast addressing, FF00::/8 identifies multicast addresses, and FC00::/7 is reserved for unique local addresses. Recognizing these ranges is useful when examining IPv6 interfaces and troubleshooting neighbor or routing relationships.

Question 43. What is the primary function of IPv6 Neighbor Discovery Protocol (NDP)?

1. Assign IPv4 addresses through DHCP
2. Replace Ethernet switching
3. Provide functions such as neighbor discovery, address resolution, and router discovery
4. Encrypt all IPv6 application traffic

Correct Answer: 3. Provide functions such as neighbor discovery, address resolution, and router discovery

Explanation:

IPv6 Neighbor Discovery Protocol (NDP) provides several functions that are handled by a combination of protocols in IPv4. Using ICMPv6 messages, NDP supports neighbor discovery, address resolution, router discovery, and detection of certain reachability conditions. For example, Neighbor Solicitation and Neighbor Advertisement messages can help a host determine the link-layer address associated with an IPv6 neighbor. Router Solicitation and Router Advertisement messages assist hosts in learning about available IPv6 routers and network configuration. NDP does not replace Ethernet switching and does not inherently encrypt application traffic. Understanding NDP is essential when troubleshooting IPv6 connectivity and gateway discovery.

Question 44. Which IPv4 mechanism allows a host to determine the MAC address associated with a known IPv4 address on the local network?

1. DHCP
2. ARP
3. DNS
4. NTP

Correct Answer: 2. ARP

Explanation:

Address Resolution Protocol (ARP) maps a known IPv4 address to the corresponding Layer 2 MAC address on a local network. When an IPv4 host needs to send traffic to another device on the same subnet, it can use an ARP request to discover the destination’s MAC address. The receiving device can respond with an ARP reply, allowing the sender to construct an Ethernet frame. If the destination is on another subnet, the host generally resolves the MAC address of its default gateway instead. DHCP provides configuration, DNS resolves names, and NTP synchronizes time; none of those protocols performs IPv4-to-MAC resolution.

Question 45. Which network service is primarily responsible for translating human-readable domain names into IP addresses?

1. DNS
2. SNMP
3. FTP
4. SSH

Correct Answer: 1. DNS

Explanation:

Domain Name System (DNS) translates human-readable names such as hostnames and domain names into IP addresses and can also provide other forms of name-related information. This allows users and applications to use meaningful names instead of remembering numerical addresses. A DNS client typically sends a query to a configured DNS resolver, which may retrieve the required information from authoritative servers or its cache. SNMP is used for network management, FTP transfers files, and SSH provides secure remote administration. DNS problems can cause applications to appear unreachable even when basic IP connectivity is functioning correctly, making DNS an important troubleshooting consideration.

Question 46. Which protocol provides secure command-line remote administration of a network device?

1. Telnet
2. TFTP
3. SSH
4. HTTP

Correct Answer: 3. SSH

Explanation:

Secure Shell (SSH) provides encrypted remote command-line access to network devices and servers. It protects administrative sessions against many forms of interception that can occur when credentials and commands are transmitted without adequate protection. SSH is therefore generally preferred over Telnet for secure device management. Telnet transmits session information without the same level of cryptographic protection, while TFTP is primarily a lightweight file-transfer protocol. HTTP provides web-based communication and, by itself, does not provide the same secure remote CLI function. Administrators should also restrict management access using appropriate ACLs, authentication, and management-plane security policies.

Question 47. What is the primary purpose of Network Time Protocol (NTP) in network infrastructure?

1. Assign IP addresses
2. Synchronize system clocks
3. Discover Layer 2 neighbors
4. Establish VPN tunnels

Correct Answer: 2. Synchronize system clocks

Explanation:

NTP synchronizes the clocks of network devices and other systems with a trusted time source. Accurate time is important for troubleshooting, event correlation, security logs, authentication mechanisms, certificates, and network management. If different devices have significantly different clocks, it can become difficult to determine the sequence of events during an incident. NTP can use a hierarchy of time sources, allowing devices to synchronize with configured servers. NTP does not provide IP addressing, Layer 2 neighbor discovery, or VPN establishment. In enterprise environments, centralized and reliable time synchronization is therefore an important part of operational management.

Question 48. Which statement best describes the purpose of a loopback interface on a network device?

1. It provides a logical interface that is independent of a particular physical port
2. It automatically creates a wireless SSID
3. It converts Layer 2 frames into DHCP packets
4. It disables routing protocols

Correct Answer: 1. It provides a logical interface that is independent of a particular physical port

Explanation:

A loopback interface is a logical interface that does not depend on the operational state of a single physical Ethernet port. Because of this characteristic, loopback addresses are often useful as stable identifiers for management, routing-protocol configuration, monitoring, and other services. For example, a routing protocol may use a loopback address as a router identifier because the address can remain available even if one physical interface fails. A loopback interface does not automatically create wireless networks or disable routing. Its usefulness comes from providing a logical, stable interface that can be reached through the network when appropriate routes exist.

Question 49. In a switched network, what is the main purpose of BPDU Guard on an edge/access port?

1. Increase the port’s bandwidth
2. Automatically assign the port to every VLAN
3. Protect the spanning-tree topology by reacting when unexpected BPDUs are received
4. Encrypt BPDUs between switches

Correct Answer: 3. Protect the spanning-tree topology by reacting when unexpected BPDUs are received

Explanation:

BPDU Guard is commonly applied to edge or access ports where administrators expect an endpoint rather than another switch to be connected. If a BPDU is unexpectedly received on such a protected port, the device can take a configured protective action, commonly placing the port into an error or disabled state. This helps prevent an unauthorized or incorrectly connected switching device from influencing the spanning-tree topology. BPDU Guard does not increase bandwidth or encrypt BPDUs. It is a Layer 2 protection feature that complements edge-port configurations and helps reduce the risk of accidental or malicious topology changes.

Question 50. What is the main purpose of DHCP snooping on a managed switch?

1. To increase DHCP server capacity
2. To identify and control DHCP messages based on trusted and untrusted ports
3. To replace DNS
4. To provide wireless encryption

Correct Answer: 2. To identify and control DHCP messages based on trusted and untrusted ports

Explanation:

DHCP snooping is a Layer 2 security feature that helps protect networks against unauthorized DHCP servers and certain DHCP-based attacks. Administrators can designate interfaces connected toward legitimate DHCP infrastructure as trusted while treating client-facing ports as untrusted. DHCP messages that violate the configured trust model can then be blocked or handled according to the switch’s implementation. DHCP snooping can also provide information that other security mechanisms use to validate IP-to-MAC-to-port relationships. It does not replace DNS or provide wireless encryption. Correct trust configuration is important because incorrectly trusting an untrusted access port can reduce the protection provided by the feature.

Question 51. What security problem can Dynamic ARP Inspection (DAI) help mitigate?

1. Unauthorized manipulation of ARP information
2. Excessive wireless channel width
3. Incorrect DNS domain names
4. OSPF area mismatch

Correct Answer: 1. Unauthorized manipulation of ARP information

Explanation:

Dynamic ARP Inspection (DAI) helps protect a Layer 2 network against malicious or invalid ARP messages. ARP does not inherently provide strong authentication, which means an attacker can attempt to send forged ARP information and redirect traffic through an unintended device. DAI can inspect ARP packets and validate them against trusted information, commonly using bindings learned through DHCP snooping or other configured mechanisms, depending on the platform. This can help reduce ARP spoofing and related man-in-the-middle risks. DAI is a Layer 2 security feature and does not address DNS configuration, OSPF adjacency, or wireless channel planning.

Question 52. What is the primary objective of network segmentation using security policies or VLANs?

1. Make every device part of the same broadcast domain
2. Remove the need for authentication
3. Automatically increase Internet bandwidth
4. Limit communication between different groups or security zones according to policy

Correct Answer: 4. Limit communication between different groups or security zones according to policy

Explanation:

Network segmentation separates users, devices, applications, or services into logical security or broadcast domains. VLANs can provide Layer 2 separation, while ACLs, firewalls, and other security policies can control communication between those segments. For example, guest clients can be isolated from internal corporate resources while still receiving Internet access. Segmentation can reduce the scope of unwanted traffic and limit the potential impact of compromised devices. It does not automatically increase Internet bandwidth or eliminate authentication requirements. Effective segmentation requires clearly defined policies and correct implementation at the switching, routing, and security layers.

Question 53. Which routing protocol characteristic allows OSPF to select a route based on a calculated path cost?

1. OSPF metric
2. Ethernet frame size
3. DNS priority
4. VLAN ID

Correct Answer: 1. OSPF metric

Explanation:

OSPF uses a cost metric when calculating routes through the network. The SPF calculation considers the costs associated with links and determines the total path cost toward destinations. Lower total cost is generally preferred when comparing eligible OSPF paths. The cost can be influenced by interface characteristics and, depending on the implementation, administrative configuration. This is different from route preference, which can be used when comparing routes from different sources. Ethernet frame size, DNS priority, and VLAN ID are not OSPF path-selection metrics. Understanding OSPF cost is useful when troubleshooting why one path is selected over another within an OSPF domain.

Question 54. What is the primary purpose of OSPF neighbor adjacency between two directly connected routers?

1. To assign VLAN IDs
2. To exchange routing information and maintain synchronized link-state information
3. To encrypt user passwords
4. To provide DHCP addresses

Correct Answer: 2. To exchange routing information and maintain synchronized link-state information

Explanation:

OSPF routers establish neighbor relationships so they can exchange routing information and participate in the link-state routing process. After appropriate adjacency formation, routers can exchange link-state information and maintain a consistent view of the relevant topology. This information contributes to the link-state database used by the SPF algorithm to calculate routes. Neighbor formation depends on compatible configuration and operational conditions, including parameters such as area membership and network connectivity. OSPF does not use neighbor adjacency to assign VLAN IDs, distribute DHCP addresses, or provide general password encryption. Troubleshooting OSPF commonly begins by examining neighbor status and exchanged parameters.

Question 55. Which IPv4 subnet mask provides exactly 62 usable host addresses in a traditional subnet with network and broadcast addresses reserved?

1. 255.255.255.248
2. 255.255.255.224
3. 255.255.255.192
4. 255.255.255.128

Correct Answer: 3. 255.255.255.192

Explanation:

The subnet mask 255.255.255.192 corresponds to a /26 prefix. A /26 IPv4 subnet contains 64 total addresses. In the traditional calculation, one address is reserved as the network address and one as the broadcast address, leaving 62 usable host addresses. By comparison, /29 provides 6 usable hosts, /27 provides 30 usable hosts, and /25 provides 126 usable hosts. Subnetting is important for designing appropriately sized network segments and controlling broadcast-domain size. When calculating a subnet, administrators should also consider whether the platform or special addressing design changes the conventional network and broadcast-address assumptions.

Question 56. Which command or diagnostic utility is commonly used to test basic IP reachability by sending ICMP Echo messages?

1. ping
2. nslookup
3. arp
4. ftp

Correct Answer: 1. ping

Explanation:

The ping utility is commonly used to test basic IP reachability between a source and destination. It typically sends ICMP Echo Request messages and evaluates returned Echo Reply messages. Ping can provide useful information such as whether a destination responds and, depending on the implementation, approximate round-trip time and packet-loss behavior. However, a failed ping does not automatically prove that a destination is completely unreachable because firewalls or security policies may block ICMP. nslookup focuses on DNS queries, arp examines IPv4 neighbor mappings, and FTP is a file-transfer protocol. Ping is therefore an important first-line diagnostic tool.

Question 57. Which troubleshooting tool is most directly useful for identifying the Layer 3 path that packets take toward a remote destination?

1. ping
2. traceroute/tracert
3. arp
4. ipconfig

Correct Answer: 2. traceroute/tracert

Explanation:

Traceroute or its platform-specific equivalent, such as tracert, is designed to reveal the sequence of Layer 3 hops encountered while traffic travels toward a destination. It does this by manipulating the IP packet’s TTL or hop-limit behavior and observing responses from intermediate routers. This can help identify where latency, filtering, routing problems, or path changes may occur. Ping is useful for basic reachability but normally does not show every intermediate hop. ARP focuses on local IPv4 neighbor resolution, while ipconfig primarily displays local interface configuration. Traceroute is therefore particularly useful when a destination is reachable only partially or experiences path-related problems.

Question 58. What is the purpose of Network Address Translation (NAT) in many enterprise Internet-edge designs?

1. Convert VLANs into STP instances
2. Provide wireless channel allocation
3. Translate addresses between different addressing domains
4. Replace routing protocols

Correct Answer: 3. Translate addresses between different addressing domains

Explanation:

Network Address Translation (NAT) changes address information as traffic passes between different addressing domains. A common enterprise use is translating private internal IPv4 addresses into one or more public IPv4 addresses for Internet access. NAT can conserve public IPv4 address space and hide internal addressing details from directly appearing on the public side. Different NAT forms provide different mappings and behaviors, so administrators must understand the configured translation policy. NAT does not replace routing, create VLANs, or assign wireless channels. When troubleshooting Internet connectivity, administrators should consider both routing and NAT because correct routing alone does not guarantee that the required address translation is occurring.

Question 59. Which characteristic is most associated with TCP rather than UDP?

1. Connection-oriented communication with mechanisms for reliable ordered delivery
2. No sequence information
3. No retransmission mechanisms
4. Always lower latency regardless of application

Correct Answer: 1. Connection-oriented communication with mechanisms for reliable ordered delivery

Explanation:

TCP provides connection-oriented transport services and includes mechanisms such as sequence numbers, acknowledgments, retransmissions, and flow control to support reliable, ordered delivery. These features make TCP suitable for applications where data must arrive accurately and in the correct order. UDP is connectionless and provides a simpler transport service without TCP’s built-in reliability mechanisms. This does not mean UDP is always faster in every situation; application requirements and network conditions determine the appropriate protocol. Understanding TCP and UDP differences helps administrators troubleshoot application connectivity, firewall policies, QoS classification, and transport-layer behavior.

Question 60. A network administrator observes that a switch interface has rapidly increasing input errors and CRC errors. Which issue should be investigated first?

1. Incorrect DNS records
2. An OSPF area configuration
3. A wireless SSID mismatch
4. Physical-layer problems such as a faulty cable, connector, or interface

Correct Answer: 4. Physical-layer problems such as a faulty cable, connector, or interface

Explanation:

Increasing CRC and input errors on an Ethernet interface commonly indicate a problem that should first be investigated at the physical or data-link boundary. Possible causes include a damaged or unsuitable cable, defective connectors, interference, faulty transceivers, or a problematic network interface. Administrators should inspect interface counters, verify speed and duplex behavior where applicable, replace suspect cabling, and test the endpoint or switch port systematically. DNS, OSPF, and SSID configuration do not normally produce CRC errors directly. Starting with the physical layer follows a structured troubleshooting methodology and can prevent unnecessary changes to higher-layer configurations.