View Full Huawei H12-811 Exam Dumps and Practice Test Dumps

 

Question 201

Which subnet mask provides 14 usable IPv4 host addresses?

1. 255.255.255.248
2. 255.255.255.224
3. 255.255.255.240
4. 255.255.255.252

Correct Answer: 3

Explanation:

A subnet providing 14 usable host addresses requires 16 total addresses because two addresses are reserved for the network and broadcast functions. A 16-address subnet uses a /28 prefix, equivalent to 255.255.255.240. A /29 provides only 6 usable hosts, while /27 provides 30 usable hosts. A /30 provides only 2 usable addresses. Correct subnet sizing helps avoid wasting address space while ensuring that enough host addresses are available for the devices connected to the network.

Question 202

Which OSPF value identifies a router uniquely within an area?

1. Router ID
2. Process ID
3. Area cost
4. Link metric

Correct Answer: 1

Explanation:

The OSPF Router ID uniquely identifies an OSPF router within the routing domain. It is represented as a 32-bit value written in IPv4 address format. The Router ID can be explicitly configured or selected according to OSPF’s router-ID selection rules. A process ID identifies a local routing process in some implementations, while cost and metric values influence path selection rather than uniquely identifying routers. Correct Router ID configuration is particularly important when predictable OSPF behavior is required.

Question 203

Which STP value determines the preferred root path?

1. VLAN priority
2. Port security
3. Path cost
4. MAC aging

Correct Answer: 3

Explanation:

STP path cost is used when switches compare available paths toward the root bridge. A lower cumulative path cost represents a more preferred path. Port speed influences the default cost assigned to an interface, although the exact values depend on the configured STP cost standard. VLAN priority controls bridge-selection behavior in relevant VLAN contexts, while MAC aging concerns Layer 2 address-table entries. Path cost is therefore a fundamental factor in determining which redundant Layer 2 path becomes active.

Question 204

Which VLAN mechanism allows multiple VLANs over one link?

1. Access mode
2. Trunking
3. Port isolation
4. MAC filtering

Correct Answer: 2

Explanation:

Trunking allows a single physical link to transport traffic belonging to multiple VLANs. Ethernet frames can carry VLAN identification information so that the receiving switch knows which logical broadcast domain each frame belongs to. Access ports normally serve a single VLAN for endpoint connectivity, while port isolation and MAC filtering provide different forms of traffic or access control. Trunk links are commonly used between switches and between network devices where several VLANs must cross the same physical connection.

Question 205

Which RSTP role provides an alternate path toward the root?

1. Designated
2. Root
3. Alternate
4. Edge

Correct Answer: 3

Explanation:

The RSTP alternate port provides an alternative path toward the root bridge when the primary path is unavailable. It remains in a discarding state while the preferred path is active and can transition quickly when topology conditions change. The root port provides the best path toward the root, while a designated port serves a particular network segment. Edge ports are normally associated with directly connected endpoint devices. Alternate ports contribute to rapid recovery in redundant Layer 2 topologies.

Question 206

Which Huawei technology forms a logical switch from multiple devices?

1. iStack
2. NAT
3. VRRP
4. PPPoE

Correct Answer: 1

Explanation:

iStack is a Huawei switch virtualization technology that allows multiple physical switches to operate together as a logical switching system. This arrangement can simplify management and improve device-level redundancy. Instead of treating every switch as an entirely independent device, the stack can provide a coordinated operational model. NAT translates addresses, VRRP provides gateway redundancy, and PPPoE establishes subscriber sessions. iStack is therefore directly associated with combining compatible Huawei switches into a unified logical switching environment.

Question 207

Which command enters Huawei interface configuration view?

1. system-view
2. quit
3. interface GigabitEthernet 0/0/1
4. return

Correct Answer: 3

Explanation:

The interface GigabitEthernet 0/0/1 command enters the configuration view for the specified interface on a Huawei VRP device. Interface-specific settings such as IP addressing, shutdown state, VLAN behavior, or other parameters can then be configured. system-view enters general system configuration view, while quit moves back one configuration level and return exits toward user view. Understanding VRP command views is essential because many configuration commands are valid only within their appropriate context.

Question 208

Which ACL rule action allows matching traffic?

1. Reject
2. Permit
3. Drop
4. Deny

Correct Answer: 2

Explanation:

The permit action allows traffic that matches an ACL rule to continue according to the device’s forwarding behavior. ACLs can contain multiple rules that examine characteristics such as addresses, protocols, or ports. A deny action blocks matching traffic, while other terms such as reject or drop may describe behavior in different technologies but are not the standard ACL action being tested here. Correctly ordering and defining permit rules is important because ACL processing follows the device’s configured rule-matching logic.

Question 209

Which NAT feature lets many hosts share one public address?

1. PAT
2. Static NAT
3. Dynamic NAT
4. Destination NAT

Correct Answer: 1

Explanation:

PAT, or Port Address Translation, allows multiple private hosts to share a public IPv4 address by distinguishing individual sessions through transport-layer port information. This greatly increases the number of internal devices that can access external networks using a limited public address pool. Static NAT generally creates a fixed one-to-one mapping, while dynamic NAT assigns addresses from a public pool. PAT is therefore widely used at Internet gateways where many internal clients need outbound connectivity through a smaller number of public addresses.

Question 210

Which service automatically assigns IP configuration to clients?

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

Correct Answer: 2

Explanation:

DHCP automatically provides clients with network configuration information such as IPv4 addresses, subnet masks, default gateways, and DNS server addresses. This eliminates the need to manually configure every endpoint and makes centralized address management possible. DNS resolves names, NTP synchronizes system clocks, and FTP transfers files. DHCP typically uses a lease mechanism, allowing addresses to be assigned for defined periods and later reused. Correct DHCP operation is therefore important in large networks with many dynamically configured devices.

Question 211

Which OSPF area connects other areas together?

1. Area 1
2. Stub area
3. Area 0
4. NSSA

Correct Answer: 3

Explanation:

Area 0, also called the backbone area, provides the central inter-area connectivity structure in OSPF. Other OSPF areas normally connect to the backbone through Area Border Routers. This hierarchical design reduces the scope of link-state information and supports scalable routing. Stub areas and NSSAs are specialized area types with different LSA-handling characteristics, while an ordinary numbered area does not inherently provide the backbone function. Proper backbone connectivity is therefore important in multi-area OSPF designs.

Question 212

Which protocol prevents switching loops by blocking redundant paths?

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

Correct Answer: 3

Explanation:

Spanning Tree Protocol prevents Layer 2 switching loops by logically blocking redundant paths while retaining them as potential alternatives. Ethernet networks can contain physical redundancy for resilience, but unrestricted forwarding across those redundant paths could create broadcast storms and repeated frame circulation. STP calculates a loop-free logical topology and can activate alternate paths when the topology changes. OSPF operates at Layer 3, DHCP provides host configuration, and VRRP provides gateway redundancy, so STP specifically addresses Layer 2 loops.

Question 213

Which protocol provides remote command-line access securely?

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

Correct Answer: 3

Explanation:

SSH provides secure remote command-line access by encrypting the management session between the client and server. It is commonly used for securely administering routers, switches, and servers across IP networks. Telnet also provides remote command-line access but does not provide the same level of encryption for normal sessions. FTP and TFTP are file-transfer protocols rather than interactive remote-management protocols. SSH is therefore preferred when administrators need protected remote access to network devices.

Question 214

Which OSPF router connects different areas?

1. ABR
2. DR
3. BDR
4. ASBR

Correct Answer: 1

Explanation:

An Area Border Router, or ABR, connects one OSPF area to another and maintains separate link-state databases for its attached areas. ABRs play an important role in inter-area route exchange and hierarchical OSPF design. A DR and BDR are associated with multi-access network segments, while an ASBR connects OSPF to external routing domains. Distinguishing these roles helps administrators understand how OSPF builds relationships and distributes routing information across different parts of the network.

Question 215

Which Ethernet feature bundles links into one logical connection?

1. Port isolation
2. Eth-Trunk
3. VLAN mapping
4. Storm control

Correct Answer: 2

Explanation:

Eth-Trunk bundles multiple physical Ethernet interfaces into a single logical link. The resulting aggregation can provide greater aggregate bandwidth and redundancy. Traffic is distributed among member interfaces according to the configured load-balancing mechanism. If one member fails, other operational members can continue carrying traffic. Port isolation controls Layer 2 communication between interfaces, VLAN mapping modifies VLAN relationships, and storm control limits excessive traffic. Eth-Trunk is therefore the technology directly associated with physical-link aggregation.

Question 216

Which SNMP component describes managed objects?

1. Agent
2. Manager
3. MIB
4. Trap

Correct Answer: 3

Explanation:

The Management Information Base, or MIB, defines the managed objects that can be monitored or manipulated through SNMP. These objects represent information such as interface statistics, system parameters, and other device characteristics. The SNMP agent operates on the managed device, while the manager typically initiates monitoring operations. A trap is an asynchronous notification generated when a configured event occurs. Understanding the MIB is important because it provides the structured definitions used by management systems when accessing device information.

Question 217

Which IPv6 address type identifies a group of receivers?

1. Multicast
2. Unicast
3. Anycast
4. Link-local

Correct Answer: 1

Explanation:

An IPv6 multicast address identifies a group of interfaces rather than a single destination. Packets sent to a multicast address can be delivered to multiple subscribed receivers. Unicast identifies an individual interface, while anycast identifies a group of interfaces where traffic is delivered to an appropriate member according to routing. Link-local describes address scope rather than a multicast group function. IPv6 multicast is widely used by Neighbor Discovery and other network services that require communication with multiple participating nodes.

Question 218

Which Python type stores key-value pairs?

1. Tuple
2. Dictionary
3. List
4. String

Correct Answer: 2

Explanation:

A Python dictionary stores information as key-value pairs. Each key provides a way to retrieve its associated value, making dictionaries useful for structured data such as device attributes, interface parameters, or configuration settings. Lists store ordered collections, tuples provide immutable sequences, and strings represent textual data. Dictionaries are particularly useful in network automation because configuration data can be organized using meaningful keys rather than relying solely on numerical positions.

Question 219

Which WAN technology establishes a session over Ethernet?

1. PPPoE
2. MPLS
3. HDLC
4. Frame Relay

Correct Answer: 1

Explanation:

PPPoE, or Point-to-Point Protocol over Ethernet, allows PPP sessions to operate across Ethernet networks. It is commonly associated with broadband access environments where authentication and session management are required over an Ethernet-based connection. PPPoE includes a discovery phase followed by session establishment. MPLS uses labels for packet forwarding, while HDLC and Frame Relay represent different WAN technologies. Understanding PPPoE is useful when studying subscriber access and Ethernet-based WAN connectivity.

Question 220

Which IPv6 mechanism automatically discovers routers?

1. DHCPv6
2. Router Advertisement
3. ARP
4. DNS

Correct Answer: 2

Explanation:

Router Advertisement messages are part of IPv6 Neighbor Discovery and allow hosts to learn information about available routers and network prefixes. Routers periodically send these messages, and hosts can also trigger them through Router Solicitation messages. IPv6 does not use ARP; Neighbor Discovery uses ICMPv6 instead. DHCPv6 can provide additional configuration information, but Router Advertisement is central to router discovery and can also support stateless address configuration.