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

 

Question 221.

Which Huawei VRP command is used to create VLAN 100 and enter its VLAN view?

1. vlan 100
   2. create vlan 100
   3. vlan-interface 100
   4. port vlan 100

Correct Answer: 1. vlan 100

Explanation:

On Huawei VRP, the vlan 100 command entered from system view creates VLAN 100 if it does not already exist and then enters the VLAN configuration view. VLANs divide a switched Layer 2 network into separate broadcast domains, allowing administrators to separate users or services logically even when they share the same physical switching infrastructure. Creating the VLAN is only one part of the configuration. Access interfaces must be assigned to the VLAN, or trunk interfaces must be configured to permit its tagged traffic. If Layer 3 communication is required, a Vlanif interface can also be created and assigned an IP address. Commands such as vlan-interface 100 are not the normal Huawei VRP syntax for creating a VLAN.

Question 222.

Which Huawei VRP command configures an Ethernet interface as an access port?

1. port default vlan
   2. port link-type access
   3. switchport mode access
   4. access-port enable

Correct Answer: 2. port link-type access

Explanation:

The port link-type access command configures a Huawei Ethernet interface as an access port. Access ports are generally used to connect devices such as PCs, printers, cameras, and other endpoints that participate in a single VLAN and normally send and receive untagged Ethernet frames. After configuring the access link type, the administrator typically uses port default vlan <vlan-id> to associate the port with the intended VLAN. The switch then internally classifies incoming untagged frames as belonging to that VLAN. This differs from trunk ports, which are commonly used between switches or other VLAN-aware devices and can carry traffic for multiple VLANs. switchport mode access is syntax associated with other network operating systems rather than Huawei VRP.

Question 223.

Which Huawei VRP command assigns an access port to VLAN 100?

1. switchport access vlan 100
   2. vlan assign 100
   3. port default vlan 100
   4. access vlan-id 100

Correct Answer: 3. port default vlan 100

Explanation:

On a Huawei access interface, the port default vlan 100 command associates untagged traffic on that interface with VLAN 100. Before applying it, the interface is typically configured as an access port using port link-type access. When an endpoint sends an untagged Ethernet frame into that port, the switch internally treats the frame as part of VLAN 100. When traffic from VLAN 100 is forwarded back to the endpoint, the frame is normally sent without an IEEE 802.1Q tag. This configuration is common for user-facing ports because most ordinary endpoints are not expected to process VLAN tags themselves. The VLAN should already exist on the switch, otherwise the administrator should create it first.

Question 224.

Which Huawei VRP command permits VLANs 100 and 200 to traverse a trunk interface?

1. trunk vlan permit 100 200
   2. switchport trunk vlan 100 200
   3. vlan allow 100 200
   4. port trunk allow-pass vlan 100 200**

Correct Answer: 4. port trunk allow-pass vlan 100 200

Explanation:

The port trunk allow-pass vlan 100 200 command allows frames belonging to VLANs 100 and 200 to cross a Huawei trunk interface. A trunk is typically configured with port link-type trunk and is used between switches, routers, firewalls, wireless controllers, or other devices that understand VLAN tagging. IEEE 802.1Q tags identify the VLAN associated with most frames transported over the trunk. A common troubleshooting situation occurs when the physical trunk is up but one VLAN cannot communicate across it because that VLAN is missing from the allow-pass list. Administrators should therefore verify both ends of the trunk and confirm that the required VLANs exist and are permitted consistently across the entire Layer 2 path.

Question 225.

Which Layer 2 protocol prevents switching loops when redundant Ethernet links exist?

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

Correct Answer: 1. STP

Explanation:

Spanning Tree Protocol, or STP, prevents Layer 2 loops by creating a logical loop-free topology from a physically redundant Ethernet network. Redundant links are valuable because they provide alternate paths if a connection or device fails, but unmanaged Layer 2 loops can be extremely disruptive. Ethernet broadcast and unknown-unicast frames can circulate repeatedly, creating broadcast storms, duplicate frames, and unstable MAC address learning. STP solves this by electing a root bridge, calculating preferred forwarding paths, and placing unnecessary redundant ports into non-forwarding states. If an active path fails, STP can reconverge and activate an alternate path. OSPF and BGP are routing protocols, while DHCP provides IP configuration and does not prevent Ethernet loops.

Question 226.

Which switch is elected as the central reference point in an STP topology?

1. Designated switch
   2. Root bridge
   3. Backup router
   4. Area Border Router

Correct Answer: 2. Root bridge

Explanation:

STP elects one switch as the root bridge, which becomes the reference point for calculating the loop-free Layer 2 topology. The switch with the lowest bridge ID wins the election. The bridge ID includes a configurable priority component and a MAC-address-related value, allowing administrators to influence which switch becomes root by changing its bridge priority. Non-root switches calculate their lowest-cost path toward the root bridge and select root ports accordingly. Network designers often choose a centrally located or strategically important distribution switch as the preferred root to create predictable traffic paths. Allowing root election to depend entirely on default values can lead to an undesirable device becoming root, which may produce inefficient forwarding paths.

Question 227.

Which STP port on a non-root switch provides the best path toward the root bridge?

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

Correct Answer: 3. Root port

Explanation:

Every non-root switch in an STP topology selects one root port that represents its best path toward the root bridge. The selection is based first on the lowest accumulated path cost, with additional STP tie-breakers used when multiple paths have equal cost. Traffic moving from the non-root switch toward the root normally leaves through the root port. The root bridge itself does not have a root port because it is already the reference point for the topology. Designated ports are selected on individual network segments to provide the best forwarding path toward the root from that segment. Understanding root-port selection is useful when predicting STP forwarding behavior and troubleshooting unexpected Layer 2 traffic paths.

Question 228.

Which STP value can be manually adjusted to make a specific switch more likely to become the root bridge?

1. OSPF cost
   2. VLAN name
   3. DHCP lease time
   4. Bridge priority**

Correct Answer: 4. Bridge priority

Explanation:

Bridge priority is the primary configurable STP value used to influence root bridge election. STP chooses the switch with the lowest bridge ID, and bridge priority forms part of that identifier. By configuring a lower priority on the switch that should become root, an administrator can make the topology more predictable. If multiple switches have the same priority, a MAC-address-related value is used as a tie-breaker. Proper root placement matters because Layer 2 forwarding paths are calculated relative to the root bridge. In a hierarchical enterprise design, the preferred root is often placed at the distribution or aggregation layer rather than allowing an access switch to become root accidentally. OSPF cost, VLAN names, and DHCP timing do not control STP root election.

Question 229.

Which protocol improves upon traditional STP by providing faster convergence after a Layer 2 topology change?

1. RSTP
   2. RIP
   3. VRRP
   4. SNMP

Correct Answer: 1. RSTP

Explanation:

Rapid Spanning Tree Protocol, or RSTP, improves convergence speed compared with traditional IEEE 802.1D STP. It introduces enhanced port roles, faster state transitions, and negotiation mechanisms that allow suitable links to begin forwarding more quickly after topology changes. Faster convergence is important in modern networks because long Layer 2 interruptions can affect voice, video, business applications, and other time-sensitive services. RSTP remains compatible with the basic spanning-tree goal of eliminating loops while retaining redundant paths for resilience. RIP is a routing protocol, VRRP provides gateway redundancy, and SNMP is used for network management. RSTP is standardized as IEEE 802.1w and is commonly implemented on enterprise switches.

Question 230.

Which technology provides redundant default gateways to hosts by using a shared virtual IP address?

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

Correct Answer: 2. VRRP

Explanation:

Virtual Router Redundancy Protocol, or VRRP, allows multiple routers or Layer 3 devices to provide a shared virtual default gateway address. End hosts configure the virtual IP address as their default gateway rather than using the physical address of a single router. One VRRP device operates as the master and normally forwards traffic, while one or more backup devices monitor the master and can take over if it fails. This improves first-hop availability without requiring users to manually change their gateway settings after a failure. VRRP complements other redundancy technologies but solves a different problem from STP or LACP. STP protects Layer 2 topology, while LACP manages aggregated links.

Question 231.

Which VRRP role normally forwards packets addressed through the virtual gateway?

1. Backup
   2. Root
   3. Master
   4. Designated

Correct Answer: 3. Master

Explanation:

The VRRP master router normally handles traffic associated with the shared virtual gateway address. Backup routers monitor the master and remain ready to assume the master role if it becomes unavailable. End hosts generally continue using the same virtual IP address throughout the failover, which helps maintain gateway availability with minimal disruption. VRRP uses priority to influence which device becomes master, and additional election rules are used when priorities are equal. The terms root and designated are associated primarily with spanning-tree behavior, not VRRP. Correct VRRP design often places the preferred master close to the normal forwarding path and coordinates gateway redundancy with switching and routing topology.

Question 232.

Which VRRP parameter is commonly changed to influence which router becomes master?

1. VLAN tag
   2. OSPF metric
   3. MAC aging time
   4. VRRP priority**

Correct Answer: 4. VRRP priority

Explanation:

VRRP priority is used to influence master-router election. In general, the device with the higher VRRP priority is preferred for the master role, subject to other protocol rules. Administrators configure priorities so the preferred router normally provides gateway forwarding, while another router remains available as a backup. This allows traffic patterns and redundancy behavior to align with the intended network design. If the preferred master fails, a backup can take control of the virtual gateway and continue forwarding host traffic. When the preferred router returns, preemption behavior may determine whether it resumes the master role. VLAN tagging, OSPF metrics, and MAC aging timers are unrelated to VRRP master election.

Question 233.

Which Huawei technology combines several physical Ethernet interfaces into one logical interface?

1. Eth-Trunk
   2. Vlanif
   3. LoopBack
   4. Tunnel only

Correct Answer: 1. Eth-Trunk

Explanation:

Huawei uses an Eth-Trunk interface to combine multiple physical Ethernet links into one logical interface. Link aggregation can provide both increased aggregate bandwidth and redundancy. If one physical member fails, traffic can continue across the remaining active members, depending on the configuration. Traffic is generally distributed using a hashing or load-balancing method based on fields such as source and destination MAC or IP information. Because individual flows may remain on one member link, the aggregate bandwidth does not necessarily mean that one single flow can use the combined speed of all links. Eth-Trunk interfaces can be configured for Layer 2 switching or, where supported, Layer 3 routing functions.

Question 234.

Which protocol dynamically negotiates the membership of physical links in an Ethernet aggregation group?

1. OSPF
   2. LACP
   3. ARP
   4. ICMP

Correct Answer: 2. LACP

Explanation:

Link Aggregation Control Protocol, or LACP, dynamically negotiates link aggregation between compatible devices. Both ends exchange information about candidate member interfaces and determine which links can actively participate in the logical bundle. LACP can make aggregation more robust than purely manual configuration because it can detect inconsistencies and manage active and standby members according to platform capabilities. The links should still have compatible characteristics and configuration, including speed, duplex, VLAN settings, and other relevant parameters. OSPF is a Layer 3 routing protocol, ARP resolves IPv4 addresses to MAC addresses, and ICMP carries IP control and diagnostic messages.

Question 235.

Which command creates or enters Huawei Eth-Trunk interface 5?

1. trunk-group 5
   2. eth-trunk create 5
   3. interface Eth-Trunk 5
   4. aggregate interface 5

Correct Answer: 3. interface Eth-Trunk 5

Explanation:

The interface Eth-Trunk 5 command creates or enters the configuration view for Eth-Trunk interface 5 on Huawei VRP. After creating the logical interface, physical Ethernet interfaces can be assigned as members using the appropriate configuration. Layer 2 or Layer 3 settings are then normally applied to the logical Eth-Trunk according to the network design. For example, a Layer 2 Eth-Trunk between switches may be configured as a trunk and permitted to carry multiple VLANs. Using a logical interface simplifies management because several physical links can be treated as one connection. Administrators should verify member status and aggregation mode on both connected devices to prevent connectivity problems.

Question 236.

Which major benefit is provided when multiple physical links are successfully combined into an Eth-Trunk?

1. Automatic DNS resolution
   2. Automatic OSPF area creation
   3. Elimination of all VLAN tags
   4. Greater aggregate bandwidth and redundancy**

Correct Answer: 4. Greater aggregate bandwidth and redundancy

Explanation:

An Eth-Trunk can provide greater aggregate bandwidth by distributing traffic across several physical member links. It also improves resilience because the failure of one member does not necessarily bring down the entire logical connection. Remaining active links can continue carrying traffic, although total available bandwidth is reduced. Link aggregation is commonly used between switches, between switches and routers, and between network devices and servers with multiple interfaces. It does not eliminate the need for VLAN configuration or automatically create routing protocols. Administrators should also remember that traffic distribution is normally based on a hashing algorithm, so a single traffic flow may remain on one physical member rather than being split evenly across all links.

Question 237.

Which protocol is primarily used to monitor routers and switches by reading management information and counters?

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

Correct Answer: 1. SNMP

Explanation:

Simple Network Management Protocol, or SNMP, allows management systems to collect operational information from network devices. Examples include interface traffic counters, error statistics, CPU utilization, memory usage, device status, and other values represented through management objects. Managed devices run SNMP agents, while a Network Management System acts as the manager. Devices can also send notifications such as traps when important events occur. SNMP helps administrators monitor large environments without manually logging in to every router or switch. Security configuration is important because earlier SNMP versions offer weaker protection than SNMPv3. DHCP provides addressing, ARP resolves local IPv4 neighbors, and STP prevents Ethernet switching loops.

Question 238.

Which protocol synchronizes the system clocks of network devices?

1. DNS
   2. NTP
   3. FTP
   4. LACP

Correct Answer: 2. NTP

Explanation:

Network Time Protocol, or NTP, synchronizes clocks across network devices and systems. Accurate time is critical for troubleshooting and security because logs from routers, switches, firewalls, servers, and applications must be correlated correctly when investigating an event. If device clocks differ significantly, determining the true sequence of events becomes difficult. Accurate time also supports authentication systems, monitoring, certificates, and scheduled operations. Network devices can synchronize with internal or external time sources, depending on organizational design. DNS performs name resolution, FTP transfers files, and LACP negotiates link aggregation. Administrators should also configure the correct time zone and ensure reliable NTP reachability.

Question 239.

Which Huawei VRP command provides a concise summary of interface IP addresses and protocol status?

1. display vlan
   2. display version
   3. display ip interface brief
   4. display users

Correct Answer: 3. display ip interface brief

Explanation:

The display ip interface brief command gives a compact overview of Huawei device Layer 3 interfaces, including IP addressing and interface status information. It is one of the most useful commands during initial troubleshooting because it lets an administrator quickly identify interfaces that are administratively or operationally down, interfaces with unexpected addresses, and logical interfaces that may not be active. If more detail is required, the administrator can use commands such as display interface or inspect the current configuration. The VLAN, version, and user commands show different information. Reviewing interface status before examining routing protocols often saves time because a routing failure may simply result from an underlying interface problem.

Question 240.

A Huawei router has a route to a destination network in its routing table, but packets still fail to reach the destination. Which troubleshooting step is most appropriate next?

1. Immediately erase the configuration
   2. Disable all routing protocols
   3. Replace the router without testing
   4. Verify the next hop, outbound interface, ARP resolution, and return path**

Correct Answer: 4. Verify the next hop, outbound interface, ARP resolution, and return path

Explanation:

The presence of a route in the routing table confirms that the router has selected a path, but it does not prove that packets can successfully traverse that path and return. The administrator should verify that the next hop is reachable, the outbound interface is operational, and ARP resolution succeeds when Ethernet next-hop forwarding is required. Ping and tracert can help identify where forwarding stops. The remote side must also have a valid return route; otherwise requests may reach the destination but replies will not return correctly. ACLs, NAT policies, VLAN configuration, and physical connectivity may also need inspection. Erasing configuration or replacing hardware before testing these possibilities would be unnecessarily disruptive and would not follow a systematic troubleshooting approach.