View Full Huawei H12-811 V2.0 Exam Dumps and Practice Test Dumps

 

Question 381.

Which Huawei VRP command displays basic neighbor information learned through LLDP?

1. display lldp neighbor brief
   2. display ospf peer
   3. display arp
   4. display ip routing-table

Correct Answer: 1. display lldp neighbor brief

Explanation:

The display lldp neighbor brief command provides a concise view of neighboring devices discovered through the Link Layer Discovery Protocol. LLDP allows directly connected network devices to advertise information such as identity, port information, and device capabilities. This is useful when documenting topology or troubleshooting an unknown physical connection. Unlike routing protocols, LLDP operates locally between directly connected devices and does not calculate network paths. display ospf peer shows OSPF routing neighbors, display arp shows IPv4-to-MAC mappings, and display ip routing-table displays Layer 3 routes. LLDP information is especially valuable when administrators need to identify what is connected to a switch port without tracing cabling manually.

Question 382.

Which protocol allows directly connected network devices from different vendors to advertise identity and interface information to each other?

1. ARP
   2. LLDP
   3. DHCP
   4. VRRP

Correct Answer: 2. LLDP

Explanation:

Link Layer Discovery Protocol, or LLDP, is a vendor-neutral Layer 2 discovery protocol used by directly connected network devices. A switch, router, access point, or other compatible device can advertise information such as its system name, interface identity, capabilities, and management details. These advertisements help administrators understand physical network topology and diagnose cabling or port-assignment issues. LLDP does not forward information across routers and does not replace routing protocols. ARP resolves IPv4 addresses to MAC addresses, DHCP assigns network parameters, and VRRP provides redundant default gateways. Because LLDP is standardized, it is particularly useful in environments containing equipment from multiple manufacturers.

Question 383.

Which Huawei technology provides a logical interface that can remain operational independently of a specific physical Ethernet port?

1. Access port
   2. Vlanif only
   3. LoopBack interface
   4. Console interface

Correct Answer: 3. LoopBack interface

Explanation:

A LoopBack interface is a logical Layer 3 interface that is not tied directly to a single physical port. Because it is software-based, it can remain operational as long as the device itself is functioning and the interface is not administratively disabled. LoopBack interfaces are often used for stable management addresses, routing-protocol Router IDs, or other functions requiring an address that does not disappear when one physical link fails. Routing must still provide reachability to the LoopBack address from remote networks. A Vlanif interface depends on the state of the corresponding VLAN, while access and console interfaces serve different purposes. Stable logical addressing makes LoopBack interfaces especially useful in routed infrastructure.

Question 384.

Which Huawei VRP command is used to create or enter LoopBack interface 0?

1. loopback 0
   2. create loopback 0
   3. interface logical 0
   4. interface LoopBack 0**

Correct Answer: 4. interface LoopBack 0

Explanation:

The interface LoopBack 0 command creates or enters the configuration view for LoopBack interface 0 on a Huawei VRP device. Once inside the interface view, an administrator can assign an IP address and apply supported settings. Because LoopBack interfaces are logical rather than dependent on one physical connection, they are commonly used as stable management endpoints or Router IDs for protocols such as OSPF. If remote devices need to reach the LoopBack address, the network must advertise or otherwise route that prefix correctly. The interface itself does not automatically create end-to-end reachability. Huawei VRP uses the interface command hierarchy for LoopBack configuration just as it does for many physical and logical interfaces.

Question 385.

Which protocol assigns IP addresses, subnet masks, default gateways, and other network parameters automatically to clients?

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

Correct Answer: 1. DHCP

Explanation:

Dynamic Host Configuration Protocol, or DHCP, automates the assignment of network parameters to hosts. Depending on configuration, a DHCP server can provide an IPv4 address, subnet mask, default gateway, DNS server information, lease duration, and other options. This reduces administrative workload and lowers the risk of duplicate or incorrectly entered addresses compared with manual configuration. A client normally exchanges DHCPDISCOVER, DHCPOFFER, DHCPREQUEST, and DHCPACK messages during initial address acquisition. DNS resolves names, NTP synchronizes clocks, and STP prevents Layer 2 loops. DHCP is especially valuable in user networks where many devices connect dynamically and where manual addressing would be impractical.

Question 386.

Which DHCP message is sent by a client to locate available DHCP servers?

1. DHCPACK
   2. DHCPDISCOVER
   3. DHCPOFFER
   4. DHCPRELEASE

Correct Answer: 2. DHCPDISCOVER

Explanation:

A DHCP client typically begins the address-acquisition process by sending a DHCPDISCOVER message. Because the client may not yet have a usable IPv4 address or know the location of the DHCP server, this initial message is usually sent using broadcast behavior on the local network. DHCP servers that receive the request can reply with DHCPOFFER messages. The client then selects an offer and sends DHCPREQUEST, after which the selected server can confirm the lease with DHCPACK. DHCPRELEASE is used when a client voluntarily gives up an address. Remembering this sequence helps administrators troubleshoot situations where clients fail to obtain valid addressing information.

Question 387.

Which DHCP message is normally sent by a server after receiving a DHCPDISCOVER from a client?

1. DHCPREQUEST
   2. DHCPNAK
   3. DHCPOFFER
   4. DHCPRELEASE

Correct Answer: 3. DHCPOFFER

Explanation:

After a DHCP server receives a valid DHCPDISCOVER message and has an address available, it typically sends a DHCPOFFER. The offer contains a proposed IPv4 address and may include other settings such as the subnet mask, default gateway, DNS servers, and lease duration. A client may receive offers from more than one server and then selects one by sending a DHCPREQUEST. The chosen server finalizes the process with DHCPACK. If a request cannot be accepted, a DHCPNAK may be used in some situations. Understanding each stage of the DHCP exchange helps isolate whether a failure occurs during client discovery, server response, address request, or final acknowledgment.

Question 388.

Which DHCP message normally confirms that the requested lease has been successfully assigned to the client?

1. DHCPDISCOVER
   2. DHCPOFFER
   3. DHCPREQUEST
   4. DHCPACK**

Correct Answer: 4. DHCPACK

Explanation:

DHCPACK is the server message that confirms successful lease assignment to the requesting client. After receiving DHCPACK, the client can normally configure the assigned address and other supplied network parameters and begin regular communication. If the server determines that the requested configuration is invalid, unavailable, or inappropriate, it may instead send DHCPNAK. A successful DHCP process is often summarized by the DORA sequence: Discover, Offer, Request, Acknowledge. If clients remain without valid addresses, administrators can examine each stage of this exchange using packet captures, DHCP server logs, interface configuration, and relay settings where the server is located on another subnet.

Question 389.

Which device function allows DHCP clients on one subnet to use a DHCP server located on another IP subnet?

1. DHCP relay
   2. NAT overload
   3. STP root bridge
   4. DNS recursion

Correct Answer: 1. DHCP relay

Explanation:

A DHCP relay forwards DHCP messages between clients and servers located on different IP subnets. DHCP clients initially rely on broadcast communication, and routers do not normally forward Layer 2 broadcasts between subnets. A relay function receives the client’s DHCP message and forwards it to the configured server using Layer 3 communication. The server’s response is then relayed back toward the client. This architecture allows an organization to centralize DHCP services rather than operating a separate server on every user subnet. NAT, STP, and DNS do not perform this broadcast-relay function. If a client can communicate locally but cannot obtain an address from a remote DHCP server, the relay configuration and routing path should be checked.

Question 390.

Which protocol translates human-readable hostnames into IP addresses?

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

Correct Answer: 2. DNS

Explanation:

Domain Name System, or DNS, translates names such as server.example.com into IP addresses that applications can use for network communication. Without DNS, users and applications would often need to remember numerical addresses directly. DNS uses different record types for different purposes, including A records for IPv4 addresses and AAAA records for IPv6 addresses. If a host can reach a server by IP address but not by hostname, DNS should be investigated early. DHCP may supply the client’s DNS server address, but DHCP itself does not perform name resolution. ARP resolves local IPv4 addresses to MAC addresses, while LLDP discovers directly connected network devices.

Question 391.

Which DNS record maps a hostname to an IPv4 address?

1. MX
   2. PTR
   3. A
   4. AAAA

Correct Answer: 3. A

Explanation:

A DNS A record maps a hostname to an IPv4 address. For example, a hostname such as www.example.com can have an A record pointing to the IPv4 address of the web server. AAAA records provide the equivalent mapping for IPv6 addresses. MX records identify mail exchangers for a domain, while PTR records are used primarily for reverse lookups from an IP address back to a hostname. When troubleshooting a name-resolution issue involving an IPv4 service, administrators should verify that the relevant A record exists, contains the expected address, and can be retrieved from the configured DNS server.

Question 392.

Which DNS record type maps a hostname to an IPv6 address?

1. A
   2. PTR
   3. MX
   4. AAAA**

Correct Answer: 4. AAAA

Explanation:

A DNS AAAA record associates a hostname with an IPv6 address. A dual-stack server may have both an A record for IPv4 and an AAAA record for IPv6. Applications can query DNS and select an address according to their networking capabilities and local behavior. If an incorrect AAAA record points to an unreachable IPv6 address, users may experience connection delays or failures even when the IPv4 service works correctly. The A record maps hostnames to IPv4 addresses, PTR supports reverse name resolution, and MX identifies mail servers. Understanding the distinction between A and AAAA records is essential in networks where IPv4 and IPv6 operate together.

Question 393.

Which IPv6 mechanism performs functions similar to IPv4 ARP and also supports router discovery?

1. Neighbor Discovery
   2. NAT
   3. DHCPv4
   4. LACP

Correct Answer: 1. Neighbor Discovery

Explanation:

IPv6 Neighbor Discovery is an ICMPv6-based mechanism that performs several essential local-link functions. It can resolve IPv6 addresses to Layer 2 addresses, discover neighboring routers, determine whether neighbors remain reachable, and support Duplicate Address Detection. IPv4 uses ARP primarily for local address resolution, but IPv6 replaces that process with Neighbor Solicitation and Neighbor Advertisement messages as part of Neighbor Discovery. Router Solicitation and Router Advertisement messages support router and prefix discovery. Because these functions are essential, indiscriminately blocking ICMPv6 can break normal IPv6 operation. NAT, DHCPv4, and LACP serve unrelated purposes.

Question 394.

Which IPv6 message can a router send to advertise network-prefix and default-router information to hosts?

1. Neighbor Solicitation
   2. Router Advertisement
   3. DHCPDISCOVER
   4. ARP Reply

Correct Answer: 2. Router Advertisement

Explanation:

An IPv6 router sends Router Advertisement messages to inform local hosts about important network information. These messages can identify the router as a default-router candidate and advertise prefixes that hosts can use for address configuration. Router Advertisements are part of ICMPv6 Neighbor Discovery and play an important role in Stateless Address Autoconfiguration. Hosts can also send Router Solicitation messages to request an advertisement instead of waiting for the next periodic one. Neighbor Solicitation is used for functions such as address resolution and reachability, while DHCPDISCOVER and ARP Reply are associated with IPv4 mechanisms. Correct Router Advertisement behavior is important when hosts are expected to configure IPv6 addresses automatically.

Question 395.

Which IPv6 mechanism checks whether a newly configured address is already being used by another device on the local link?

1. SLAAC
   2. NAPT
   3. Duplicate Address Detection
   4. STP

Correct Answer: 3. Duplicate Address Detection

Explanation:

Duplicate Address Detection, or DAD, verifies that an IPv6 address is unique on the local link before the interface begins using it normally. DAD is part of Neighbor Discovery and relies on ICMPv6 messaging. The node sends a Neighbor Solicitation related to the tentative address and watches for evidence that another device already uses it. If a duplicate is detected, the address should not become a normal usable address. This mechanism helps prevent conflicts that could lead to unpredictable communication. SLAAC may generate an address, but DAD checks its uniqueness. NAPT is an IPv4 translation method, and STP prevents Layer 2 loops.

Question 396.

Which IPv6 address is the loopback address?

1. FE80::1
   2. FF02::1
   3. ::
   4. ::1**

Correct Answer: 4. ::1

Explanation:

The IPv6 loopback address is ::1. It allows a device to send traffic to its own local IPv6 protocol stack and is comparable to 127.0.0.1 in IPv4. Traffic addressed to ::1 remains inside the local system and is never forwarded onto the physical network. The address :: is the unspecified address, commonly used when a node does not yet have a specific address in a particular context. FE80-prefixed addresses are generally link-local, while FF-prefixed addresses are multicast. Testing ::1 can confirm that the local IPv6 stack is functioning, but it does not confirm that a physical interface or remote IPv6 destination is reachable.

Question 397.

Which IPv6 prefix is associated with link-local unicast addresses?

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

Correct Answer: 1. FE80::/10

Explanation:

IPv6 link-local unicast addresses use the FE80::/10 prefix range. These addresses are automatically relevant to local-link communication and are not normally routed between separate Layer 3 networks. Link-local addresses are important for Neighbor Discovery, router communication, and various routing protocols. A device can have a link-local address even if it does not possess a global IPv6 address. FF00::/8 identifies multicast addresses, 2000::/3 is associated with global unicast addressing, and FC00::/7 defines the unique-local range. Because link-local addresses may repeat on different network segments, administrators often need to specify the relevant interface when testing or configuring communication using them.

Question 398.

Which IPv6 prefix is associated with multicast addresses?

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

Correct Answer: 2. FF00::/8

Explanation:

IPv6 multicast addresses begin with the FF00::/8 prefix. Multicast is extensively used in IPv6 for communication with groups of interfaces and replaces many functions that depended on broadcast in IPv4. For example, Neighbor Discovery uses multicast groups to communicate with relevant nodes on the local link. IPv6 does not use traditional broadcast addressing. The 2000::/3 range is associated with global unicast addresses, FE80::/10 identifies link-local unicast addresses, and FC00::/7 identifies unique-local addresses. Recognizing these major prefixes helps administrators quickly determine the likely function and scope of an IPv6 address when reading configurations or packet captures.

Question 399.

Which Huawei VRP command is used to verify the saved configuration that will be available after a reboot?

1. display current-configuration
   2. display startup
   3. display saved-configuration
   4. display version

Correct Answer: 3. display saved-configuration

Explanation:

The display saved-configuration command shows the configuration stored for future startup use. It is particularly valuable after configuration changes because the administrator can compare the saved configuration with the currently active configuration. If important changes exist only in the current configuration and have not been saved, they may disappear after the device restarts. The display current-configuration command shows what is active right now, while display version shows software and hardware information. Verifying saved configuration before planned maintenance or rebooting helps prevent unexpected loss of routing, VLAN, interface, security, or management settings.

Question 400.

A Huawei switch has correct access-port VLAN assignments, but hosts in the same VLAN on two different switches cannot communicate. The inter-switch physical link is up. Which configuration should be checked first?

1. NTP server reachability
   2. OSPF Router ID
   3. DNS server records
   4. Trunk link type and allowed VLAN list**

Correct Answer: 4. Trunk link type and allowed VLAN list

Explanation:

If hosts on the same VLAN work locally but cannot communicate across two switches, the inter-switch Layer 2 path should be checked first. The connecting interfaces should normally be configured as trunks, and the affected VLAN must be permitted across the trunk on both switches. On Huawei VRP, relevant commands include port link-type trunk and port trunk allow-pass vlan. The VLAN must also exist on both devices. Administrators can use display vlan, display interface, and display mac-address to verify membership, trunk status, and MAC learning. NTP, OSPF Router IDs, and DNS records do not control Layer 2 propagation of a VLAN across an inter-switch link. Correct trunk configuration is therefore the most relevant starting point.