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

 

Question 41.

Which OSPF packet type is used to discover neighbors and maintain neighbor relationships?

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

Correct Answer: 1. Hello packet

Explanation:

OSPF Hello packets are used to discover neighboring OSPF routers and maintain adjacency information. They carry parameters such as the router ID, area ID, hello interval, dead interval, and other values that must match appropriately for neighbors to form. Database Description, Link State Request, and Link State Update packets are used later during link-state database synchronization. If Hello packets stop arriving for the configured dead interval, the neighbor relationship is considered down.

Question 42.

Which identifier uniquely identifies an OSPF router within an OSPF domain?

1. MAC address
   2. Router ID
   3. VLAN ID
   4. TCP port

Correct Answer: 2. Router ID

Explanation:

The OSPF Router ID is a 32-bit value that uniquely identifies an OSPF router within the routing domain. It is written in dotted-decimal format similar to an IPv4 address, but it does not have to be an active interface address. The Router ID is important in neighbor relationships and link-state advertisements. Administrators often configure it manually to ensure stability and predictable OSPF behavior.

Question 43.

Which OSPF area is the backbone area?

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

Correct Answer: 3. Area 0

Explanation:

Area 0 is the OSPF backbone area. In a multi-area OSPF design, other regular areas should connect logically to Area 0 so that inter-area routing can function correctly. Area Border Routers connect the backbone to non-backbone areas. Using multiple areas can improve scalability by reducing the size of link-state databases and limiting the scope of certain OSPF calculations and updates.

Question 44.

Which type of OSPF router connects one OSPF area to another?

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

Correct Answer: 4. Area Border Router

Explanation:

An Area Border Router, or ABR, has interfaces participating in more than one OSPF area and connects non-backbone areas to the backbone. It maintains separate link-state information for the areas it connects and can advertise summarized inter-area routing information. A Designated Router and Backup Designated Router have roles on certain multiaccess networks but do not inherently connect different OSPF areas.

Question 45.

Which OSPF router is elected on a broadcast network to reduce the number of adjacencies among routers?

1. Designated Router
   2. Default router
   3. Area Border Router only
   4. Autonomous System Boundary Router only

Correct Answer: 1. Designated Router

Explanation:

On broadcast and some multiaccess OSPF networks, a Designated Router, or DR, is elected to reduce the number of full adjacencies that would otherwise be required between all routers on the segment. A Backup Designated Router is also elected to provide redundancy. This design reduces routing-protocol overhead and simplifies link-state information exchange on shared networks.

Question 46.

Which OSPF value is used to influence DR and BDR election on an interface?

1. Route metric
   2. Interface priority
   3. VLAN ID
   4. TCP window size

Correct Answer: 2. Interface priority

Explanation:

OSPF interface priority is used during DR and BDR election on eligible multiaccess networks. A router with a higher interface priority is preferred, while a priority of zero makes the router ineligible for DR or BDR election on that interface. If priorities are equal, the Router ID is used as a tie-breaker. The election is not based directly on OSPF route cost.

Question 47.

Which Huawei VRP command starts an OSPF process with process ID 1?

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

Correct Answer: 3. ospf 1

Explanation:

On Huawei VRP, the ospf 1 command entered in system view starts or enters OSPF process 1. From the OSPF view, the administrator can configure the Router ID, areas, network statements, and other OSPF parameters. The process ID is locally significant and helps distinguish multiple OSPF processes that may exist on the same device.

Question 48.

Which Huawei VRP command enters OSPF Area 0 from the OSPF process view?

1. network area 0
   2. ospf area 0
   3. set area 0
   4. area 0**

Correct Answer: 4. area 0

Explanation:

Within the Huawei OSPF process view, the area 0 command enters the configuration view for OSPF Area 0. Network statements and other area-specific settings can then be configured. Area 0 is the backbone of an OSPF multi-area design. Correct area configuration is essential because mismatched area assignments can prevent neighboring routers from forming proper OSPF relationships.

Question 49.

Which protocol is used to dynamically assign IPv4 addresses to clients from an address pool?

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

Correct Answer: 1. DHCP

Explanation:

DHCP dynamically provides clients with IPv4 configuration from an address pool. This usually includes an IP address, subnet mask, default gateway, and DNS server information. DHCP simplifies administration and reduces the risk of duplicate or incorrectly configured addresses. The normal DHCP exchange includes Discover, Offer, Request, and Acknowledgment messages, commonly referred to as DORA.

Question 50.

Which DHCP message is normally sent first by a client that does not yet have an IPv4 address?

1. DHCPACK
   2. DHCPDISCOVER
   3. DHCPREQUEST
   4. DHCPOFFER

Correct Answer: 2. DHCPDISCOVER

Explanation:

A client that needs an address typically begins by sending a DHCPDISCOVER message to locate available DHCP servers. A server may respond with a DHCPOFFER. The client then sends a DHCPREQUEST, and the selected server completes the process with a DHCPACK. This sequence allows clients to obtain valid network parameters automatically without manual configuration.

Question 51.

Which DHCP message is sent by a server to propose an IP address to a requesting client?

1. DHCPDISCOVER
   2. DHCPREQUEST
   3. DHCPOFFER
   4. DHCPRELEASE

Correct Answer: 3. DHCPOFFER

Explanation:

After receiving a DHCPDISCOVER, a DHCP server can respond with a DHCPOFFER containing an available IP address and associated network parameters. The client may receive offers from multiple servers and then selects one by sending a DHCPREQUEST. The final DHCPACK confirms the lease. Understanding this sequence is useful when diagnosing address-assignment failures.

Question 52.

Which DHCP message confirms that an address lease has been successfully assigned to the client?

1. DHCPDISCOVER
   2. DHCPOFFER
   3. DHCPREQUEST
   4. DHCPACK**

Correct Answer: 4. DHCPACK

Explanation:

DHCPACK is sent by the DHCP server to confirm that the requested address and configuration have been assigned to the client. Once the client receives the acknowledgment, it can normally configure the interface and begin using the lease. If the requested configuration cannot be granted, a DHCPNAK may be sent instead. DHCP leases are time-limited and can be renewed before they expire.

Question 53.

Which technology allows devices in private IPv4 networks to access the public internet using translated public addresses?

1. NAT
   2. STP
   3. LLDP
   4. VLAN tagging

Correct Answer: 1. NAT

Explanation:

NAT translates IPv4 address information between networks, commonly between private internal addresses and public external addresses. It allows organizations to use RFC 1918 private addressing internally while still reaching the internet. Depending on the NAT type, address mappings may be static, dynamic, or combined with port translation. NAT helps conserve public IPv4 addresses but should not be treated as a complete replacement for firewall security.

Question 54.

Which NAT type creates a fixed one-to-one mapping between a private address and a public address?

1. Dynamic NAT
   2. Static NAT
   3. NAPT
   4. DHCP relay

Correct Answer: 2. Static NAT

Explanation:

Static NAT creates a permanent one-to-one mapping between an internal private IPv4 address and an external public IPv4 address. It is useful when an internal server must be consistently reachable through the same public address. Dynamic NAT selects public addresses from a pool, while NAPT allows multiple internal hosts to share one or a small number of public addresses by translating port numbers.

Question 55.

Which NAT method dynamically selects a public IPv4 address from a configured pool?

1. Static NAT
   2. NAPT only
   3. Dynamic NAT
   4. DNS relay

Correct Answer: 3. Dynamic NAT

Explanation:

Dynamic NAT maps private addresses to available public addresses selected from a configured pool. The mapping is created when needed rather than being permanently fixed. Static NAT uses predefined one-to-one mappings, while NAPT also translates transport-layer port numbers so many internal hosts can share fewer public addresses. Dynamic NAT requires enough public addresses in the pool to support concurrent mappings.

Question 56.

Which NAT method is especially useful when many internal hosts must share a single public IPv4 address?

1. Static NAT
   2. Dynamic NAT without ports
   3. Proxy ARP
   4. NAPT**

Correct Answer: 4. NAPT

Explanation:

NAPT translates both IP addresses and transport-layer port numbers, allowing many private hosts to share one public IPv4 address simultaneously. Each connection can be distinguished by translated port information. This technique is widely used on enterprise and home internet gateways because it significantly reduces public IPv4 address consumption. Some environments refer to the same basic concept as PAT.

Question 57.

Which protocol allows network devices to advertise identity and capability information to directly connected neighbors?

1. LLDP
   2. OSPF
   3. DHCP
   4. DNS

Correct Answer: 1. LLDP

Explanation:

LLDP, or Link Layer Discovery Protocol, allows directly connected devices to exchange information such as device identity, port information, and capabilities. It operates at Layer 2 and is useful for network discovery and documentation. OSPF exchanges routing information, DHCP provides IP configuration, and DNS performs name resolution. LLDP information can help administrators determine how devices are physically interconnected.

Question 58.

Which Huawei VRP command can be used to view learned LLDP neighbor information?

1. display ospf peer
   2. display lldp neighbor brief
   3. display ip routing-table
   4. display arp

Correct Answer: 2. display lldp neighbor brief

Explanation:

The display lldp neighbor brief command can be used on Huawei VRP devices to view summarized LLDP neighbor information. This can reveal directly connected devices and interfaces and is useful for topology discovery and troubleshooting. Routing-table, ARP, and OSPF peer commands show different types of operational information and do not replace LLDP neighbor discovery.

Question 59.

Which protocol is designed to aggregate multiple physical Ethernet links into one logical link for increased bandwidth and redundancy?

1. ARP
   2. DHCP
   3. Link aggregation
   4. DNS

Correct Answer: 3. Link aggregation

Explanation:

Link aggregation combines multiple physical Ethernet interfaces into a single logical connection. This can increase available bandwidth and provide redundancy if one member link fails. Traffic is normally distributed among member links according to a load-balancing algorithm. On Huawei devices, an Eth-Trunk interface is commonly used to implement link aggregation.

Question 60.

Which Huawei logical interface is commonly used to configure link aggregation?

1. LoopBack
   2. Vlanif only
   3. NULL interface
   4. Eth-Trunk**

Correct Answer: 4. Eth-Trunk

Explanation:

Huawei VRP uses an Eth-Trunk interface to represent a logical aggregated Ethernet link. Multiple physical interfaces can become members of the Eth-Trunk, providing bandwidth aggregation and link redundancy. The logical interface can then be configured for Layer 2 or Layer 3 functions depending on the platform and design. Link aggregation is commonly used between switches or between switches and other network devices.