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

 

Question 261.

Which IPv6 address is used as the loopback address on a Huawei router or host?

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

Correct Answer: 2. ::1

Explanation:

The IPv6 loopback address is ::1. It serves the same general purpose as 127.0.0.1 in IPv4 and allows a device to communicate with its own local IPv6 protocol stack. Traffic sent to the loopback address does not leave the local system or travel across a physical network interface. The address :: is the IPv6 unspecified address and should not be confused with loopback. Addresses beginning with FE80 are commonly link-local addresses, while FF-prefixed addresses are multicast. Testing ::1 can help verify that IPv6 is functioning locally, but it does not prove that an interface, router, or remote network is reachable. Additional tests are needed to verify actual IPv6 network connectivity.

Question 262.

Which IPv6 prefix identifies the range commonly used for link-local addresses?

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

Correct Answer: 3. FE80::/10

Explanation:

IPv6 link-local addresses use the FE80::/10 prefix range. These addresses are intended for communication on a single local link and are not normally routed between different Layer 3 networks. They are important for many fundamental IPv6 operations, including Neighbor Discovery, router discovery, and some routing-protocol communications. Global unicast addresses are generally drawn from 2000::/3, while FC00::/7 identifies the unique-local range. FF00::/8 is reserved for multicast addressing. Link-local addressing is especially important because IPv6-enabled interfaces can use it even when no global address has been configured. Administrators troubleshooting IPv6 should understand that successful communication to a link-local neighbor demonstrates local-link operation but does not necessarily confirm wider routed IPv6 connectivity.

Question 263.

Which IPv6 address type is intended for communication across globally routed IPv6 networks?

1. Global unicast
   2. Link-local only
   3. Loopback
   4. Unspecified

Correct Answer: 1. Global unicast

Explanation:

Global unicast IPv6 addresses are designed for unique routed communication across IPv6 networks and can be broadly compared with public IPv4 addresses. They are typically allocated from the 2000::/3 range. Routers can forward traffic using global unicast addresses across multiple links and autonomous systems when appropriate routing information exists. Link-local addresses remain restricted to the local segment, while the loopback address is used only within the local device. The unspecified address represents the absence of a specific IPv6 address and is not assigned to an interface for normal communication. Understanding address scope is important because an IPv6 host may simultaneously have link-local and global addresses, each serving a different role in the network.

Question 264.

Which IPv6 mechanism allows a host to configure an address automatically from information received in Router Advertisement messages?

1. NAT
   2. ARP
   3. STP
   4. SLAAC**

Correct Answer: 4. SLAAC

Explanation:

Stateless Address Autoconfiguration, or SLAAC, enables an IPv6 host to create its own address using network-prefix information advertised by a router. Routers send ICMPv6 Router Advertisement messages that can include the prefix and configuration flags needed by the host. The host combines the advertised prefix with an interface identifier to generate an address and performs checks such as Duplicate Address Detection before using it normally. SLAAC differs from traditional stateful DHCP because a DHCP server does not maintain the address assignment itself. DHCPv6 may still be used to provide other settings or stateful addressing. ARP is an IPv4 mechanism, while STP prevents Layer 2 loops and NAT performs address translation rather than host autoconfiguration.

Question 265.

Which protocol carries IPv6 Neighbor Solicitation and Neighbor Advertisement messages?

1. ICMPv6
   2. TCP
   3. UDP
   4. ARP

Correct Answer: 1. ICMPv6

Explanation:

Neighbor Solicitation and Neighbor Advertisement messages are part of IPv6 Neighbor Discovery and are carried by ICMPv6. These messages support functions such as resolving a neighbor’s Layer 2 address, determining whether a neighbor remains reachable, and performing Duplicate Address Detection. IPv6 does not use ARP for address resolution in the same manner as IPv4. Instead, Neighbor Discovery uses ICMPv6 and multicast communication. This makes ICMPv6 especially important to normal IPv6 operation. Administrators should avoid blocking essential ICMPv6 traffic indiscriminately because doing so can disrupt fundamental functions such as router discovery and address resolution, even if ordinary application traffic would otherwise be permitted.

Question 266.

Which IPv6 feature checks whether an address is already in use before an interface begins using it normally?

1. Longest-prefix matching
   2. Duplicate Address Detection
   3. NAPT
   4. LACP

Correct Answer: 2. Duplicate Address Detection

Explanation:

Duplicate Address Detection, or DAD, verifies that a newly configured IPv6 address is not already being used by another device on the local link. It is part of IPv6 Neighbor Discovery and relies on ICMPv6 messaging. Before an address becomes fully usable, the node checks for conflicting responses from other devices. If another device indicates that the same address is already in use, the duplicate address should not be used normally. DAD helps prevent address conflicts that could otherwise cause intermittent or unpredictable communication. Longest-prefix matching is a routing principle, NAPT translates IPv4 addresses and ports, and LACP manages aggregated Ethernet links. DAD is therefore specifically an IPv6 address-validation mechanism.

Question 267.

Which IPv6 address type sends traffic to all members of a defined group?

1. Unicast
   2. Anycast only
   3. Multicast
   4. Broadcast

Correct Answer: 3. Multicast

Explanation:

IPv6 multicast addresses identify groups of interfaces, allowing one packet to be delivered to all members of the relevant multicast group. IPv6 does not use broadcast addressing in the traditional IPv4 sense. Instead, multicast is used for many control-plane functions that previously relied on broadcast, including aspects of Neighbor Discovery. Unicast identifies an individual interface, while anycast allows the same address to be assigned to multiple interfaces with routing normally delivering traffic toward the nearest instance. Multicast addresses generally begin with FF. Understanding the absence of broadcast in IPv6 is important because it changes how protocols discover neighbors and communicate with groups of devices on a local segment.

Question 268.

Which IPv6 prefix identifies multicast addresses?

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

Correct Answer: 4. FF00::/8

Explanation:

IPv6 multicast addresses use the FF00::/8 prefix. The address contains additional fields that identify flags, multicast scope, and the specific multicast group. Multicast is widely used by IPv6 because traditional broadcast addressing is not part of IPv6. For example, Neighbor Discovery and router discovery depend on multicast groups to reach relevant nodes efficiently. FE80::/10 identifies link-local unicast addressing, 2000::/3 is associated with global unicast, and FC00::/7 identifies unique-local addressing. Recognizing the major IPv6 prefixes helps administrators quickly determine the intended scope and purpose of an address when reviewing interface configurations, packet captures, or routing information.

Question 269.

Which protocol provides dynamic routing within an autonomous system using link-state information and cost as its metric?

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

Correct Answer: 1. OSPF

Explanation:

OSPF is a link-state Interior Gateway Protocol designed to exchange routing information within an autonomous system. Routers advertise link-state information, construct a synchronized database of the network topology, and run the Shortest Path First algorithm to calculate routes. OSPF uses cost as its metric rather than simple hop count. This enables administrators to influence routing decisions according to interface characteristics or configured policy. OSPF also supports hierarchical network design through areas, with Area 0 functioning as the backbone. FTP transfers files, DHCP assigns host network configuration, and STP prevents Layer 2 loops. OSPF is therefore the relevant technology when discussing dynamic Layer 3 route calculation inside an enterprise routing domain.

Question 270.

Which Huawei VRP command starts OSPF process 10?

1. router ospf 10
   2. ospf 10
   3. enable ospf 10
   4. protocol ospf 10

Correct Answer: 2. ospf 10

Explanation:

The ospf 10 command entered from system view starts or enters OSPF process 10 on a Huawei VRP device. The process identifier is locally significant and helps distinguish OSPF processes configured on the same device. After entering the OSPF view, an administrator can configure parameters such as the Router ID and enter individual OSPF area views. Networks or interfaces can then be associated with the required areas according to the device’s configuration method. Huawei syntax differs from that used by some other vendors, so knowing the correct VRP command form is important for exam questions and real-world administration. After configuration, commands such as display ospf peer and display ip routing-table can help verify that adjacencies and routes are operating correctly.

Question 271.

Which OSPF area is required as the backbone in a conventional multi-area OSPF network?

1. Area 1
   2. Area 100
   3. Area 0
   4. Area 255

Correct Answer: 3. Area 0

Explanation:

Area 0 is the OSPF backbone. In a standard multi-area design, other OSPF areas connect to the backbone through Area Border Routers. Inter-area routing information is exchanged through Area 0, making its proper connectivity essential to a stable hierarchical OSPF deployment. Dividing the network into areas helps scale OSPF because detailed link-state information can be contained within individual areas rather than flooded throughout the entire autonomous system. This reduces link-state database size and limits the scope of some topology recalculations. If a non-backbone area is incorrectly disconnected from Area 0, inter-area communication may fail or require special mechanisms. Therefore, Area 0 is one of the foundational concepts in OSPF design.

Question 272.

Which OSPF parameter is most directly used to influence path selection between routes of the same type?

1. VLAN ID
   2. MAC address
   3. TCP port
   4. Cost**

Correct Answer: 4. Cost

Explanation:

OSPF uses cost as its principal metric for selecting the preferred path. Each OSPF-enabled interface has a cost, and the total cost of a route is derived from the costs along the path. A route with a lower total OSPF cost is generally preferred over a higher-cost alternative of the same route category. Interface cost may be calculated using bandwidth-related values or manually configured to influence path selection. VLAN IDs, MAC addresses, and TCP ports are not OSPF routing metrics. When administrators want traffic to prefer one routed path over another, adjusting OSPF cost can provide deterministic control while still allowing the protocol to reconverge dynamically if topology changes occur.

Question 273.

Which Huawei VRP command can be used to display OSPF routing information specifically learned through OSPF?

1. display ospf routing
   2. display vlan routing
   3. show ospf route
   4. display lldp routing

Correct Answer: 1. display ospf routing

Explanation:

The display ospf routing command can be used on Huawei VRP devices to inspect routing information calculated by the OSPF process. It is useful when an administrator needs to focus on routes known specifically to OSPF rather than viewing the entire device routing table. The broader display ip routing-table command shows routes from multiple sources, including direct, static, and dynamic routing protocols. Comparing OSPF-specific route information with the main routing table can help explain whether OSPF has learned a route and whether that route has actually been selected for forwarding. This distinction is useful when another route source has a more favorable preference or when multiple protocols advertise the same destination.

Question 274.

Which OSPF neighbor state normally indicates that two routers have fully synchronized their link-state databases?

1. Down
   2. Full
   3. Init
   4. ExStart

Correct Answer: 2. Full

Explanation:

The Full state indicates that two OSPF neighbors have completed the required database synchronization and formed a full adjacency. Before reaching Full, routers may pass through several states such as Init, 2-Way, ExStart, Exchange, and Loading depending on network type and adjacency requirements. If routers remain stuck in an intermediate state, the administrator should investigate possible mismatches or problems involving MTU, network type, authentication, area configuration, timers, or connectivity. Not every neighbor on every multiaccess segment necessarily becomes fully adjacent with every other router, because DR and BDR behavior can affect adjacency relationships. Still, when a full adjacency is expected, the Full state is the normal successful result.

Question 275.

Which protocol is used primarily for exchanging routing information between different autonomous systems?

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

Correct Answer: 3. BGP

Explanation:

Border Gateway Protocol, or BGP, is primarily used to exchange network reachability information between autonomous systems. It is the principal inter-domain routing protocol of the internet and is classified as a path-vector protocol. BGP uses a variety of attributes to support policy-based route selection, including AS_PATH, NEXT_HOP, LOCAL_PREF, and MED in appropriate contexts. OSPF and RIP are Interior Gateway Protocols intended mainly for routing within an autonomous system. VRRP does not exchange routing information at all; instead, it provides first-hop gateway redundancy. BGP is particularly valuable where routing policy, scalability, and control over external connectivity are more important than simply choosing the numerically shortest path.

Question 276.

Which BGP attribute helps prevent routing loops by recording the autonomous systems a route has traversed?

1. VLAN ID
   2. Router priority
   3. Interface cost
   4. AS_PATH**

Correct Answer: 4. AS_PATH

Explanation:

The BGP AS_PATH attribute records the sequence of autonomous system numbers that a route advertisement has passed through. When a BGP router receives a route containing its own AS number in the AS_PATH, it can reject the advertisement to prevent an inter-domain routing loop. The AS_PATH is also used in route-selection decisions, where a shorter path may be preferred after higher-priority selection criteria have been considered. This makes AS_PATH both a loop-prevention mechanism and an important routing-policy attribute. VLAN IDs operate at Layer 2, router priority belongs to other protocol elections, and interface cost is more directly associated with link-state routing protocols such as OSPF.

Question 277.

Which type of BGP session is established between routers belonging to the same autonomous system?

1. iBGP
   2. eBGP
   3. OSPF
   4. LACP

Correct Answer: 1. iBGP

Explanation:

Internal BGP, or iBGP, is used between BGP-speaking routers that belong to the same autonomous system. Its purpose is often to distribute externally learned BGP routing information throughout the organization without changing the autonomous system boundary. External BGP, or eBGP, is used between routers in different autonomous systems. BGP has specific rules for propagating iBGP-learned information, which is why larger BGP deployments may use design mechanisms such as route reflectors. OSPF can coexist with iBGP as an internal routing protocol, but it does not replace BGP’s policy and internet-routing functions. LACP is unrelated and manages Ethernet link aggregation rather than route exchange.

Question 278.

Which protocol can be used to securely manage a Huawei router through an encrypted remote terminal session?

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

Correct Answer: 2. SSH

Explanation:

SSH provides encrypted remote terminal access and is generally preferred for secure management of routers, switches, servers, and other network devices. It protects usernames, passwords, commands, and output from straightforward interception while the session crosses the network. Telnet provides similar interactive command-line access but lacks comparable encryption and should therefore be avoided when secure management is required. TFTP and FTP are primarily file-transfer protocols rather than interactive management protocols. Secure SSH deployment should also include strong authentication, restriction of management-source networks, appropriate user privileges, and disabling unnecessary management services. Network administrators should treat the management plane as a sensitive security boundary because compromise of administrative credentials can lead to complete control of infrastructure devices.

Question 279.

Which Huawei VRP command displays users currently connected to the device through management sessions?

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

Correct Answer: 3. display users

Explanation:

The display users command provides information about users currently connected to a Huawei VRP device through supported management sessions. It can help an administrator determine which terminal or remote sessions are active and can be useful during troubleshooting or security review. For example, unexpected active sessions may indicate that another administrator is working on the device or that unauthorized access should be investigated. display version shows software and hardware information, display clock reports system time, and display interface shows interface operational details. Management-session visibility is important on shared infrastructure because simultaneous configuration changes from multiple users can cause conflicts or make troubleshooting more difficult.

Question 280.

A Huawei router can ping its directly connected next-hop router, but it cannot reach a remote destination beyond that router. The local routing table contains a valid route. What should be checked next?

1. Only the local interface description
   2. The console cable
   3. The switch hostname
   4. Downstream routing, return routing, ACLs, and NAT policies**

Correct Answer: 4. Downstream routing, return routing, ACLs, and NAT policies

Explanation:

If the Huawei router can reach its directly connected next hop and already has a valid route toward the destination, the troubleshooting scope should move farther along the forwarding path. The next router must have a route toward the final destination, and the destination side must also have a valid return path back to the original source. An ACL may be denying the traffic even though routing is correct, while a NAT policy can cause communication failure if translations are missing or incorrect. Using tracert, routing-table inspection, ACL review, NAT-session inspection, and targeted ping tests can help determine where packets stop. Checking only interface descriptions, hostnames, or console connections would not address an end-to-end Layer 3 forwarding problem.