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

 

Question 241.

Which Huawei VRP command is used to display detailed information about a specific interface?

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

Correct Answer: 1. display interface

Explanation:

The display interface command is used on Huawei VRP devices to examine detailed operational information for network interfaces. Depending on the interface and platform, the output can include physical and protocol status, link speed, duplex information, packet counters, error statistics, bandwidth utilization, and other useful parameters. This makes it an important troubleshooting command when a physical or Layer 2 connection is behaving unexpectedly. For example, an administrator investigating packet loss may check whether the interface is reporting errors or discards. A more concise summary can be obtained with commands such as display ip interface brief, but the detailed interface command provides significantly more operational information. VLAN, user-session, and clock commands do not provide the same interface-level diagnostics.

Question 242.

Which interface state indicates that the physical connection is operational but the Layer 3 protocol on the interface is not functioning correctly?

1. Administratively down
   2. Physical up, protocol down
   3. Physical down, protocol up
   4. Both physical and protocol up

Correct Answer: 2. Physical up, protocol down

Explanation:

When a Huawei interface shows the physical state as up but the protocol state as down, the underlying physical connection is generally present, but the higher-layer protocol associated with the interface is not operational. The exact cause depends on the interface type and configuration. For example, logical requirements, encapsulation, Layer 3 settings, or peer-side configuration may prevent protocol operation even though the cable and physical signal are functioning. An interface with both physical and protocol states up is normally functioning at both levels. If the physical state is down, troubleshooting should begin with cabling, transceivers, port status, or the connected device. Understanding the distinction between physical and protocol state helps administrators identify whether a problem is most likely related to hardware or logical configuration.

Question 243.

Which Huawei VRP command can be used to check the status of configured VLANs on a switch?

1. display route
   2. display arp
   3. display vlan
   4. display ospf peer

Correct Answer: 3. display vlan

Explanation:

The display vlan command provides information about VLANs configured on a Huawei switch. The output can help administrators verify that expected VLANs exist and inspect information about their associated interfaces and operating status. This is especially useful when troubleshooting a host that appears connected physically but cannot communicate with devices in the expected broadcast domain. The administrator can confirm whether the VLAN was created, whether the access port belongs to the correct VLAN, and whether trunk links are configured to carry it. Routing-table, ARP, and OSPF peer commands provide Layer 3 or routing-protocol information rather than VLAN configuration. In a structured troubleshooting process, checking VLAN configuration is appropriate when the symptoms suggest a Layer 2 segmentation or trunking problem.

Question 244.

Which Huawei VRP command displays the MAC address table learned by a Layer 2 switch?

1. display ip routing-table
   2. display arp
   3. display interface brief
   4. display mac-address**

Correct Answer: 4. display mac-address

Explanation:

The display mac-address command shows MAC address entries learned or configured on a Huawei switch. Each entry can associate a MAC address with an interface and VLAN, helping the switch decide where to forward Ethernet frames. This command is extremely useful when locating an endpoint or investigating why traffic is not reaching the expected port. For example, if a host is physically connected but its MAC address is learned on an unexpected interface, the topology or cabling may differ from what the administrator expects. If no MAC address is learned at all, the administrator may investigate the access VLAN, interface state, or endpoint transmission. Routing and ARP commands operate at Layer 3 or IP-to-MAC resolution and do not replace the switch’s Layer 2 forwarding table.

Question 245.

Which mechanism causes a switch to learn a MAC address on one of its ports?

1. Receiving a frame and examining its source MAC address
   2. Reading the destination IP address
   3. Receiving a DNS response
   4. Running OSPF on the interface

Correct Answer: 1. Receiving a frame and examining its source MAC address

Explanation:

Ethernet switches dynamically learn MAC addresses by examining the source MAC address of frames received on their interfaces. The switch records the source address together with the incoming port and the relevant VLAN in its MAC address table. Later, when the switch receives a frame destined for that MAC address, it can forward the frame toward the correct interface instead of flooding it unnecessarily. The destination MAC address is used for forwarding decisions, but source MAC information is what enables learning. Destination IP addresses are primarily relevant to Layer 3 routing, while DNS and OSPF perform entirely different functions. Dynamic MAC learning is one of the fundamental mechanisms that allows Ethernet switches to forward traffic efficiently within a LAN.

Question 246.

What does a switch normally do with a unicast Ethernet frame if the destination MAC address is not in its MAC address table?

1. Drops the frame immediately
   2. Floods it within the relevant VLAN
   3. Sends it only to the default gateway
   4. Converts it into an ARP request

Correct Answer: 2. Floods it within the relevant VLAN

Explanation:

When a switch receives a unicast frame whose destination MAC address is unknown, it normally floods the frame out appropriate interfaces in the same VLAN, excluding the interface on which it was received. This is known as unknown-unicast flooding. If the destination device responds, the switch can learn its source MAC address and improve future forwarding decisions. The switch does not automatically send the traffic only to the default gateway because Layer 2 forwarding is based on MAC addresses and VLAN membership. It also does not convert arbitrary frames into ARP requests. Flooding is therefore a normal part of Ethernet operation when the switch lacks a specific destination entry, although excessive flooding may indicate unstable or incomplete MAC learning.

Question 247.

Which table does a router consult first when deciding where to forward an IPv4 packet?

1. ARP table only
   2. MAC address table
   3. IP routing table
   4. VLAN database

Correct Answer: 3. IP routing table

Explanation:

A router consults its IP routing table to determine the best path for an IPv4 packet. The routing table contains destination prefixes together with information such as next hops, outbound interfaces, route sources, preferences, and metrics. The router applies longest-prefix matching to find the most specific destination route. After selecting the next hop or outbound interface, it may then consult an ARP table to obtain the Layer 2 address required to forward the packet over an Ethernet link. The MAC address table is primarily associated with Layer 2 switching, while a VLAN database defines Layer 2 broadcast domains. The distinction between routing-table lookup and ARP resolution is important because a router can have a valid route but still fail to forward if the next-hop Layer 2 address cannot be resolved.

Question 248.

Which routing rule causes a router to choose 192.168.1.0/24 instead of 192.168.0.0/16 for destination 192.168.1.50?

1. Highest MAC address
   2. Lowest VLAN ID
   3. First route configured
   4. Longest-prefix match**

Correct Answer: 4. Longest-prefix match

Explanation:

Routers use longest-prefix matching to choose the most specific route that matches a packet’s destination. The address 192.168.1.50 matches both 192.168.0.0/16 and 192.168.1.0/24, but the /24 route contains more matching network bits and is therefore more specific. It will be selected regardless of the fact that the /16 route also covers the destination. Route preference and metrics become important when comparing candidate routes to the same destination prefix, but prefix specificity is evaluated first. MAC addresses and VLAN IDs do not determine Layer 3 route selection. Understanding this principle is essential when working with summary routes, default routes, and more specific exception routes in enterprise networks.

Question 249.

Which route represents the IPv4 default route in a Huawei routing table?

1. 0.0.0.0/0
   2. 127.0.0.0/8
   3. 255.255.255.255/32
   4. 169.254.0.0/16

Correct Answer: 1. 0.0.0.0/0

Explanation:

The IPv4 default route is represented by 0.0.0.0/0. Because it contains a prefix length of zero, it can match any IPv4 destination. However, it is selected only when no more specific matching route exists because routers apply longest-prefix matching. Default routes are frequently used on edge routers, branch routers, and other devices that have a preferred upstream path for unknown destinations. A static default route may point toward an internet service provider or a central enterprise router. The loopback range, link-local range, and limited broadcast address serve different functions and are not default routes. Default routing simplifies routing tables in locations where maintaining detailed routes to every remote destination would be unnecessary.

Question 250.

Which Huawei VRP command can configure a default static route through next-hop address 10.1.1.1?

1. default-gateway 10.1.1.1
   2. ip route-static 0.0.0.0 0.0.0.0 10.1.1.1
   3. route default 10.1.1.1
   4. gateway-route 0.0.0.0 10.1.1.1

Correct Answer: 2. ip route-static 0.0.0.0 0.0.0.0 10.1.1.1

Explanation:

On Huawei VRP, a static default route can be configured with the ip route-static command using destination 0.0.0.0 and mask 0.0.0.0 followed by the appropriate next-hop address. In this example, traffic that does not match a more specific route can be forwarded toward 10.1.1.1. The router must still be able to reach that next hop through a directly connected or otherwise resolvable path. A default route is especially useful at a branch or edge location where most unknown traffic should leave through a single upstream device. After configuration, the administrator can use display ip routing-table to verify whether the route is active and selected.

Question 251.

Which routing protocol sends complete routing-table information periodically and uses hop count as its metric?

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

Correct Answer: 3. RIP

Explanation:

RIP is a distance-vector routing protocol that uses hop count as its primary metric. Traditional RIP behavior includes periodic exchange of routing information with neighboring routers. The protocol treats routes exceeding its maximum usable hop count as unreachable, which limits its suitability for larger networks. RIP is conceptually simpler than link-state protocols but generally converges more slowly and provides less flexible path selection. OSPF instead builds a link-state database and calculates shortest paths using cost. BGP exchanges routing information between autonomous systems using path attributes, while STP is a Layer 2 loop-prevention protocol rather than an IP routing protocol.

Question 252.

Which OSPF packet is used to discover neighboring OSPF routers and verify that they remain reachable?

1. Database Description
   2. Link State Request
   3. Link State Update
   4. Hello packet**

Correct Answer: 4. Hello packet

Explanation:

OSPF Hello packets are used to discover neighboring OSPF routers and maintain neighbor relationships. They contain important parameters such as Router ID, area information, hello interval, dead interval, and other values relevant to adjacency formation. Routers on the same segment must agree on certain settings before they can successfully become neighbors. If Hello packets stop arriving for the configured dead interval, the neighbor is considered unreachable. Once neighbors progress beyond initial discovery, other packet types are used for database synchronization. Database Description packets summarize topology information, Link State Requests ask for specific LSAs, and Link State Updates carry link-state information. Troubleshooting OSPF adjacency therefore often begins by checking whether Hello packets can be exchanged and whether the critical parameters match.

Question 253.

Which OSPF value uniquely identifies an OSPF router?

1. Router ID
   2. VLAN ID
   3. TCP source port
   4. MAC aging timer

Correct Answer: 1. Router ID

Explanation:

The OSPF Router ID is a 32-bit identifier used to uniquely identify an OSPF router within the routing domain. It is displayed in dotted-decimal format resembling an IPv4 address, but it functions as an identifier rather than necessarily representing a reachable interface address. The Router ID appears in OSPF neighbor relationships and Link State Advertisements and is important in several protocol decisions. Administrators often configure Router IDs manually to ensure stable and predictable behavior, particularly on infrastructure devices. If the Router ID changes unexpectedly, OSPF relationships and topology information may need to be re-established. VLAN IDs, TCP ports, and MAC timers do not uniquely identify an OSPF routing process.

Question 254.

Which OSPF area serves as the backbone for communication between other OSPF areas?

1. Area 1
   2. Area 0
   3. Area 255
   4. Area 65535

Correct Answer: 2. Area 0

Explanation:

Area 0 is the OSPF backbone area and plays a central role in multi-area OSPF designs. Non-backbone areas normally connect to Area 0 through Area Border Routers so that inter-area routing information can be exchanged through the backbone. Dividing a large OSPF environment into areas can reduce the size of link-state databases and limit the scope of SPF recalculations and topology flooding. However, the hierarchical design depends on proper backbone connectivity. If area assignments are incorrect or a non-backbone area is not connected appropriately to Area 0, inter-area routing problems can occur. Area 0 is therefore one of the most important OSPF concepts to understand when moving beyond a single-area deployment.

Question 255.

Which OSPF router type has interfaces in more than one OSPF area?

1. Internal router
   2. Designated Router only
   3. Area Border Router
   4. Backup Designated Router only

Correct Answer: 3. Area Border Router

Explanation:

An Area Border Router, or ABR, participates in multiple OSPF areas and connects those areas within the OSPF hierarchy. In a standard multi-area design, the ABR has connectivity to Area 0 and at least one additional area. It maintains separate link-state information for the areas it serves and exchanges inter-area routing information between them. Internal routers have all participating interfaces within the same area. Designated and Backup Designated Routers perform adjacency-management roles on certain multiaccess segments but are not defined by membership in multiple areas. ABRs help OSPF scale by containing detailed topology information within individual areas while still allowing networks in different areas to communicate.

Question 256.

Which OSPF metric determines the preferred path to a destination?

1. Hop count
   2. MAC address
   3. VLAN priority
   4. Cost**

Correct Answer: 4. Cost

Explanation:

OSPF uses cost as its routing metric. A path’s total cost is derived from the costs associated with the interfaces along the route, and lower total cost is generally preferred. Interface cost is commonly related to bandwidth but can also be configured manually to influence routing behavior. This makes OSPF more flexible than protocols that rely primarily on simple hop count. If multiple equal-cost paths exist, OSPF may be able to install more than one route depending on the platform and configuration. MAC addresses and VLAN priorities do not determine OSPF Layer 3 path selection. Administrators should understand how cost is calculated and configured because incorrect values can send traffic across slower or less desirable paths even when the network remains technically reachable.

Question 257.

Which Huawei VRP command is commonly used to inspect OSPF neighbor status?

1. display ospf peer
   2. display mac-address
   3. display vlan
   4. display nat session

Correct Answer: 1. display ospf peer

Explanation:

The display ospf peer command allows an administrator to inspect OSPF neighbor relationships on Huawei VRP devices. The output can reveal neighbor Router IDs, adjacency states, peer addresses, interface information, and other data useful for diagnosing routing-protocol problems. If two routers that should be neighbors do not appear correctly, the administrator can investigate interface addressing, subnet membership, OSPF area configuration, Hello and Dead timers, authentication, network type, and physical connectivity. OSPF routing depends on successful neighbor formation and link-state database synchronization, so checking peer status is often one of the first steps when expected OSPF routes are missing. MAC, VLAN, and NAT commands display different information and are not substitutes for OSPF neighbor verification.

Question 258.

Which technology allows multiple private IPv4 hosts to share one public IPv4 address by translating TCP or UDP port numbers?

1. Static NAT
   2. NAPT
   3. OSPF
   4. VRRP

Correct Answer: 2. NAPT

Explanation:

Network Address and Port Translation, or NAPT, allows many private hosts to communicate through one or a limited number of public IPv4 addresses. The translation device changes both IP address information and transport-layer port numbers so that individual sessions can be distinguished. For example, two internal clients might both connect to the same internet server, but the gateway can assign different translated source ports and maintain corresponding session entries. Returning traffic is then mapped back to the correct internal device. This approach is widely used because public IPv4 addresses are limited. Static NAT normally creates a fixed one-to-one address mapping, while OSPF and VRRP perform routing and gateway-redundancy functions rather than address translation.

Question 259.

Which protocol provides secure encrypted remote command-line access to Huawei network devices?

1. Telnet
   2. TFTP
   3. SSH
   4. SNMPv1

Correct Answer: 3. SSH

Explanation:

SSH, or Secure Shell, provides encrypted remote command-line access and is preferred over Telnet for network-device administration. SSH protects authentication credentials and command traffic from straightforward interception as they travel across the network. Secure management design should also restrict which source addresses can establish SSH sessions, use strong authentication, and disable unnecessary management services. Telnet provides remote terminal access but does not offer comparable encryption. TFTP is designed for simple file transfer and also lacks strong security, while SNMPv1 is an older network management protocol with limited security capabilities. Administrators should therefore use SSH whenever supported and appropriate, particularly when management traffic crosses shared or untrusted network segments.

Question 260.

A Huawei switch has an access port assigned to VLAN 10, but the connected PC receives no connectivity to other VLAN 10 hosts. The interface is physically up. What should be checked next?

1. The OSPF Router ID
   2. The NTP time source
   3. The device hostname
   4. VLAN existence, port VLAN assignment, MAC learning, and trunk VLAN propagation**

Correct Answer: 4. VLAN existence, port VLAN assignment, MAC learning, and trunk VLAN propagation

Explanation:

Because the physical interface is already up, troubleshooting should move to the Layer 2 configuration and forwarding path. The administrator should first confirm that VLAN 10 actually exists and that the endpoint-facing interface is configured as the correct link type with port default vlan 10. Next, the MAC address table should be checked to determine whether the switch is learning the PC’s source MAC address on the expected interface and VLAN. If the destination hosts are reached through another switch, every intermediate trunk should also permit VLAN 10 using the correct allow-pass configuration. An incorrect VLAN assignment or missing trunk permission can isolate the PC even though all physical links remain operational. OSPF, NTP, and device naming are not the primary concerns for this Layer 2 symptom.