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

 

Question 321.

Which Huawei VRP command is commonly used to check whether an interface is administratively shut down?

1. display interface
   2. display vlan
   3. display users
   4. display clock

Correct Answer: 1. display interface

Explanation:

The display interface command provides detailed operational information about an interface, including physical status, protocol status, traffic counters, and configuration-related state. If an interface has been administratively shut down, the output can help reveal that condition. Administrators should distinguish an administratively disabled port from one that is physically down because of cabling, optics, or a remote-device problem. This command is therefore an important first step when troubleshooting interface connectivity. If the interface is intentionally shut down, the administrator can enter the interface view and use the appropriate command, such as undo shutdown, after confirming that enabling the port is safe and consistent with the network design.

Question 322.

Which Huawei VRP command is commonly used to enable an interface that has been administratively shut down?

1. enable interface
   2. undo shutdown
   3. no shutdown
   4. interface up

Correct Answer: 2. undo shutdown

Explanation:

Huawei VRP uses the undo shutdown command in interface view to remove the administrative shutdown state and enable the interface. This reflects Huawei’s general use of the undo keyword to reverse configured commands. The command no shutdown is common on other networking platforms but is not the standard Huawei VRP form. Before enabling an interface, administrators should verify why it was disabled, especially in production networks where a shut port may be part of a maintenance procedure or security control. After enabling the interface, commands such as display interface or display ip interface brief can be used to verify whether the physical and protocol states become operational.

Question 323.

Which Huawei VRP command gives a concise view of IP addresses and interface states?

1. display version
   2. display vlan
   3. display ip interface brief
   4. display current-configuration

Correct Answer: 3. display ip interface brief

Explanation:

The display ip interface brief command provides a concise summary of Layer 3 interfaces, including configured IP addresses and interface status. It is useful when an administrator needs a quick overview without reviewing the much larger output produced by detailed interface commands. This command can rapidly reveal interfaces that are down, interfaces that lack an expected address, or logical interfaces that are not operational. It is particularly valuable during routing troubleshooting because a missing or down interface may explain why a connected route or routing-protocol adjacency is absent. display version shows system information, display vlan focuses on VLANs, and display current-configuration shows configuration rather than a concise operational IP-interface summary.

Question 324.

Which Huawei VRP command can display the configured system time?

1. display ntp
   2. show clock
   3. display timezone
   4. display clock**

Correct Answer: 4. display clock

Explanation:

The display clock command shows the current system date and time on a Huawei VRP device. Accurate time is important because event logs, security records, troubleshooting information, and protocol events depend on reliable timestamps. In environments with multiple routers and switches, devices should ideally synchronize with a trusted NTP source so their logs can be compared accurately. A time difference of even several minutes can make incident analysis difficult. show clock is associated with other platforms, while NTP-related commands may provide synchronization information rather than simply displaying the current device time. Administrators should also verify the configured time zone when interpreting timestamps.

Question 325.

Which protocol is used to synchronize the clocks of routers, switches, and servers?

1. NTP
   2. SNMP
   3. FTP
   4. DHCP

Correct Answer: 1. NTP

Explanation:

Network Time Protocol, or NTP, synchronizes clocks across IP-connected devices. Accurate and consistent time is critical in enterprise networks because it allows administrators to correlate logs from routers, switches, firewalls, servers, and applications. NTP can use a hierarchy of time sources, helping devices maintain synchronization with authoritative or internal reference clocks. Time synchronization also supports some authentication and security mechanisms that depend on timestamps. SNMP monitors and manages devices, FTP transfers files, and DHCP assigns network configuration. A functioning NTP design does not directly affect ordinary packet routing, but it greatly improves troubleshooting, monitoring, auditing, and security investigations.

Question 326.

Which protocol allows a network management platform to retrieve interface counters and device-status information?

1. DNS
   2. SNMP
   3. STP
   4. ARP

Correct Answer: 2. SNMP

Explanation:

Simple Network Management Protocol, or SNMP, enables a management system to retrieve operational information from routers, switches, servers, and other network devices. This information can include interface packet counts, error counters, CPU utilization, memory usage, and device status. SNMP agents expose information through structured management objects, while the management system queries or monitors those values. Devices can also generate notifications such as traps when important events occur. DNS performs name resolution, STP prevents Layer 2 loops, and ARP resolves IPv4 addresses to MAC addresses. In secure environments, administrators should use appropriately protected SNMP versions and restrict which management systems are allowed to communicate with device agents.

Question 327.

Which SNMP feature allows a managed device to notify a management server about an event without waiting to be polled?

1. Query
   2. Walk
   3. Trap
   4. Route advertisement

Correct Answer: 3. Trap

Explanation:

An SNMP trap is an unsolicited notification sent by a managed device to a network management system when a significant event occurs. Examples can include an interface going down, hardware alarms, or other monitored conditions. Traps complement normal polling because the management server does not need to wait until its next scheduled query to learn that something has changed. This can improve detection speed for important failures. Queries and walks are methods used by managers to retrieve information, while route advertisements are part of routing protocols and are unrelated to SNMP event notification.

Question 328.

Which protocol is most appropriate for securely transferring files over an SSH-based connection?

1. TFTP
   2. FTP
   3. Telnet
   4. SFTP**

Correct Answer: 4. SFTP

Explanation:

SFTP provides secure file transfer over an SSH-based encrypted connection. It protects both authentication information and file contents while they traverse the network. This makes it more appropriate than TFTP or traditional FTP when sensitive files must be transferred across networks that cannot be fully trusted. TFTP is lightweight but lacks strong authentication and encryption, while Telnet is designed for remote terminal access and also lacks comparable security. Administrators may use secure file-transfer mechanisms for configuration backups, software images, logs, and other operational data. Secure protocols should be combined with strong authentication and restricted management access.

Question 329.

Which Huawei technology is commonly used to provide a logical Layer 3 gateway interface for a VLAN?

1. Vlanif
   2. Eth-Trunk
   3. LoopBack
   4. Console

Correct Answer: 1. Vlanif

Explanation:

A Vlanif interface is a logical Layer 3 interface associated with a VLAN on Huawei switches. It can be configured with an IP address and used as the default gateway for hosts within that VLAN. When multiple Vlanif interfaces exist on a Layer 3 switch, the device can route traffic between the corresponding VLANs, subject to routing and security policies. An Eth-Trunk aggregates physical links, a LoopBack interface provides a logical routed interface not tied to a physical port, and the console is used for management access. Proper Vlanif configuration requires the corresponding VLAN to exist and the Layer 2 paths for that VLAN to be operational.

Question 330.

Which requirement must normally be met for a Vlanif interface to become operational?

1. OSPF must always be enabled
   2. The corresponding VLAN must exist and have an active Layer 2 presence
   3. NAT must be configured
   4. BGP must be running

Correct Answer: 2. The corresponding VLAN must exist and have an active Layer 2 presence

Explanation:

A Vlanif interface is associated with a specific VLAN, so the VLAN must exist and typically have an active Layer 2 path before the Vlanif interface becomes fully operational. If the VLAN is missing or no relevant physical or logical member interfaces are active, the protocol state of the Vlanif may remain down. OSPF, NAT, and BGP are not required simply to bring up a Vlanif interface. When troubleshooting inter-VLAN routing, administrators should therefore verify not only the Vlanif IP configuration but also the underlying VLAN and switch-port status. This illustrates how Layer 3 logical interfaces can depend on Layer 2 conditions beneath them.

Question 331.

Which protocol is used to prevent Layer 2 switching loops in a network containing redundant links?

1. VRRP
   2. OSPF
   3. STP
   4. DHCP

Correct Answer: 3. STP

Explanation:

Spanning Tree Protocol, or STP, prevents loops in Layer 2 Ethernet networks by creating a loop-free logical topology. Redundant physical links improve availability, but if all redundant links forward simultaneously without loop protection, Ethernet broadcasts and unknown unicast frames can circulate indefinitely. This can create severe broadcast storms and unstable MAC address learning. STP elects a root bridge and determines which ports should forward traffic and which redundant ports should remain blocked. If a forwarding path fails, STP can recalculate the topology and activate an alternate path. VRRP provides gateway redundancy, OSPF handles Layer 3 routing, and DHCP assigns IP configuration.

Question 332.

Which STP device is selected based on the lowest bridge ID?

1. Backup router
   2. Default gateway
   3. Area Border Router
   4. Root bridge**

Correct Answer: 4. Root bridge

Explanation:

STP elects the switch with the lowest bridge ID as the root bridge. The bridge ID includes a priority value and a MAC-address-related component. Because priority is configurable, administrators can deliberately make a preferred switch more likely to become the root. This is important because all other switches calculate their best Layer 2 paths relative to the root bridge. A poorly placed root bridge can produce inefficient traffic paths or complicate troubleshooting. Backup routers and Area Border Routers belong to different protocols and do not participate in STP root election.

Question 333.

Which STP port role is selected on a non-root switch as the preferred path toward the root bridge?

1. Root port
   2. Designated port
   3. Edge port
   4. Disabled port

Correct Answer: 1. Root port

Explanation:

Each non-root STP switch selects one root port representing its best path toward the root bridge. Root-port selection is based primarily on accumulated path cost, with additional tie-breakers used when needed. The root bridge itself has no root port because it is already the reference point for the topology. Designated ports are selected on individual network segments, while redundant ports may be placed in blocking or alternate roles depending on the spanning-tree version. Understanding these port roles helps administrators predict which links normally forward traffic and which links are held in reserve for redundancy.

Question 334.

Which protocol provides faster spanning-tree convergence and is standardized by IEEE 802.1w?

1. MSTP only
   2. RSTP
   3. LACP
   4. VRRP

Correct Answer: 2. RSTP

Explanation:

Rapid Spanning Tree Protocol, or RSTP, is defined by IEEE 802.1w and provides faster convergence than traditional IEEE 802.1D STP. It introduces additional port roles and improved transition behavior so redundant paths can become active more quickly after failures. This reduces Layer 2 interruption time and is valuable for modern application environments. RSTP still performs the fundamental spanning-tree function of creating a loop-free logical topology. LACP manages Ethernet aggregation, VRRP provides gateway redundancy, and MSTP extends spanning-tree concepts further by supporting multiple spanning-tree instances.

Question 335.

Which Huawei technology can combine several physical Ethernet interfaces into a single logical interface?

1. Vlanif
   2. LoopBack
   3. Eth-Trunk
   4. VRRP group

Correct Answer: 3. Eth-Trunk

Explanation:

Huawei uses an Eth-Trunk interface to combine multiple physical Ethernet links into one logical connection. This can increase aggregate bandwidth and improve availability. If one member link fails, traffic may continue over the remaining operational links, depending on the configuration. Eth-Trunks can operate in manual modes or use LACP for dynamic negotiation. VLAN or Layer 3 settings are commonly applied to the logical interface rather than independently to each physical member. Administrators should ensure that member interfaces have compatible characteristics and settings. Vlanif interfaces provide Layer 3 VLAN gateways, while LoopBack interfaces serve different logical routing purposes.

Question 336.

Which protocol dynamically negotiates member interfaces in a link aggregation group?

1. STP
   2. OSPF
   3. ARP
   4. LACP**

Correct Answer: 4. LACP

Explanation:

Link Aggregation Control Protocol, or LACP, dynamically manages which physical Ethernet interfaces participate in an aggregated logical link. Devices at both ends exchange LACP information and determine whether interfaces have compatible characteristics and can be bundled together. This helps identify configuration mismatches and can support active and standby members depending on the implementation. LACP does not replace STP, because aggregation and loop prevention solve different problems. OSPF handles routing, while ARP performs IPv4 neighbor address resolution.

Question 337.

Which protocol provides first-hop default-gateway redundancy for hosts?

1. VRRP
   2. STP
   3. LACP
   4. LLDP

Correct Answer: 1. VRRP

Explanation:

VRRP allows several routers or Layer 3 switches to present one shared virtual IP address to end hosts. The hosts configure that virtual address as their default gateway. One VRRP router normally operates as master and forwards traffic, while backup routers remain ready to take over if the master becomes unavailable. This improves first-hop availability without requiring endpoint reconfiguration. STP handles Layer 2 redundancy, LACP combines physical links, and LLDP discovers directly connected devices. VRRP is therefore specifically designed to protect gateway availability.

Question 338.

Which VRRP device normally forwards traffic for the virtual IP address?

1. Backup
   2. Master
   3. Root bridge
   4. OSPF DR

Correct Answer: 2. Master

Explanation:

The VRRP master router normally forwards traffic associated with the virtual gateway address. Backup routers monitor the master and can assume the role if it fails. VRRP priority is commonly used to influence which device becomes master, helping administrators align gateway forwarding with the desired network topology. End hosts continue using the virtual IP address even if the physical device performing the master role changes. Root bridge and OSPF DR are roles from different protocols and do not determine VRRP forwarding.

Question 339.

Which IPv6 protocol function replaces the address-resolution role that ARP performs in IPv4?

1. DHCPv6 only
   2. OSPFv3
   3. Neighbor Discovery
   4. NAT66

Correct Answer: 3. Neighbor Discovery

Explanation:

IPv6 Neighbor Discovery performs several local-link functions, including resolving neighboring IPv6 addresses to Layer 2 addresses. It uses ICMPv6 messages such as Neighbor Solicitation and Neighbor Advertisement instead of ARP. Neighbor Discovery also supports router discovery, Duplicate Address Detection, and reachability functions. Because of these responsibilities, ICMPv6 is essential to normal IPv6 operation and should not be indiscriminately blocked. DHCPv6 can provide configuration information, but it does not replace Neighbor Discovery’s address-resolution role.

Question 340.

A Huawei switch learns a host MAC address correctly on an access port, but the host cannot reach its default gateway in the same VLAN. Which checks are most appropriate next?

1. Change the device sysname and reboot
   2. Configure BGP immediately
   3. Disable STP across the network
   4. Verify the host IP settings, Vlanif status, ARP resolution, and VLAN path**

Correct Answer: 4. Verify the host IP settings, Vlanif status, ARP resolution, and VLAN path

Explanation:

Correct MAC learning confirms that the host is transmitting frames and that the switch can associate the source MAC address with the expected access port. The next troubleshooting steps should focus on Layer 3 and the remaining Layer 2 path. Verify that the host has the correct IPv4 address, subnet mask, and default gateway. Confirm that the corresponding Vlanif interface exists and is operational, and check whether ARP resolution occurs between the host and gateway. If the gateway resides on another switch, ensure the VLAN is permitted on all required trunk links. These targeted checks follow the actual forwarding path and are much more appropriate than changing unrelated routing protocols or disabling spanning-tree protection.