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

 

Question 1

Which OSI layer provides end-to-end reliable delivery?

1. Transport layer
2. Session layer
3. Network layer
4. Presentation layer

Correct Answer: 1

Explanation:

The Transport layer provides end-to-end communication between applications running on different hosts. It can provide reliability, sequencing, flow control, and error recovery depending on the transport protocol being used. TCP is a common example because it establishes connections and confirms successful delivery of data. UDP operates at the same layer but provides a simpler, connectionless service without TCP’s reliability mechanisms. Understanding the Transport layer is important when troubleshooting issues involving ports, application sessions, segmentation, retransmission, or end-to-end communication across an IP network.

Question 2

Which protocol resolves an IPv4 address to a MAC address?

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

Correct Answer: 2

Explanation:

ARP, or Address Resolution Protocol, maps an IPv4 address to a corresponding MAC address on a local network. When a device knows the destination IPv4 address but does not know the destination MAC address, it can send an ARP request as a broadcast. The device owning that IPv4 address responds with its MAC address. The sender can then place the MAC address into the Ethernet frame. ARP is therefore essential for IPv4 communication across Ethernet networks, particularly when hosts need to reach devices on their local subnet.

Question 3

Which protocol discovers the MAC address of an IPv6 neighbor?

1. ARP
2. RARP
3. NDP
4. DHCP

Correct Answer: 3

Explanation:

IPv6 uses Neighbor Discovery Protocol, or NDP, instead of ARP for discovering neighboring devices. NDP operates through ICMPv6 messages and provides several functions, including address resolution, router discovery, and neighbor reachability detection. Neighbor Solicitation and Neighbor Advertisement messages are particularly important for resolving IPv6 addresses to link-layer addresses. Because IPv6 does not use ARP broadcasts, understanding NDP is essential when troubleshooting IPv6 connectivity. NDP also supports mechanisms that help hosts discover routers and determine whether neighboring devices remain reachable.

Question 4

Which device primarily forwards packets using IP addresses?

1. Hub
2. Bridge
3. Repeater
4. Router

Correct Answer: 4

Explanation:

A router forwards packets primarily according to Layer 3 network information, especially destination IP addresses. It examines its routing table to determine an appropriate next hop or outgoing interface. Unlike a traditional hub, which repeats signals, or a Layer 2 switch, which forwards Ethernet frames using MAC addresses, a router connects different IP networks. Routing decisions can use directly connected networks, static routes, or dynamic routing protocols such as OSPF. This makes routers fundamental to communication between separate IPv4 or IPv6 networks.

Question 5

Which command displays the current Huawei VRP configuration?

1. display current-configuration
2. show running-config
3. display active-config
4. show configuration

Correct Answer: 1

Explanation:

On Huawei devices running VRP, display current-configuration displays the configuration currently active in the device. It is commonly used to inspect interface settings, VLAN configuration, routing parameters, security policies, and other operational configuration. This command is useful during both configuration and troubleshooting because it shows what the device is currently using. Administrators should distinguish the current configuration from the saved configuration because changes may need to be explicitly saved before they survive a device restart.

Question 6

Which IPv4 address class traditionally supports the largest host range?

1. Class B
2. Class A
3. Class C
4. Class D

Correct Answer: 2

Explanation:

In the traditional classful IPv4 system, Class A networks provided the largest host address space. A Class A network used the first octet to identify the network and provided a large number of host addresses within each network. Class B and Class C provided progressively smaller address spaces. Class D was reserved for multicast rather than ordinary host addressing. Modern networks generally use CIDR instead of traditional classful addressing, but understanding the historical classes remains useful for recognizing IPv4 concepts and legacy networking terminology.

Question 7

Which IPv4 address represents the loopback interface?

1. 169.254.1.1
2. 127.0.0.1
3. 192.168.0.1
4. 224.0.0.1

Correct Answer: 2

Explanation:

127.0.0.1 is the commonly used IPv4 loopback address. Traffic sent to this address remains within the local host rather than being transmitted onto the physical network. The broader 127.0.0.0/8 range is reserved for loopback purposes. Loopback addresses are useful for testing the local TCP/IP stack and applications without depending on external interfaces or network connectivity. This makes them valuable during troubleshooting because successful communication with the loopback address confirms that the local protocol stack is functioning.

Question 8

Which IPv4 range is reserved for multicast traffic?

1. 100.64.0.0/10
2. 169.254.0.0/16
3. 224.0.0.0/4
4. 192.0.2.0/24

Correct Answer: 3

Explanation:

The IPv4 range 224.0.0.0/4 is reserved for multicast addressing. Multicast allows a sender to transmit traffic to a group of receivers rather than sending separate unicast traffic to every destination. Various routing and network protocols use multicast addresses for control or group communication. The other listed ranges serve different purposes, such as link-local addressing, shared address space, or documentation. Understanding multicast addressing is important when studying routing protocols and network applications that depend on group-based communication.

Question 9

Which transport protocol provides connectionless communication?

1. TCP
2. SCTP
3. UDP
4. HTTP

Correct Answer: 3

Explanation:

UDP, or User Datagram Protocol, provides connectionless transport communication. It does not establish a traditional connection before sending data and does not provide TCP-style acknowledgments, retransmissions, or ordered delivery. This lightweight behavior makes UDP useful for applications where low overhead or timely delivery is more important than guaranteed delivery. DNS queries, streaming applications, and certain real-time services can use UDP. TCP also operates at the Transport layer but provides connection-oriented and reliable delivery mechanisms.

Question 10

Which TCP mechanism confirms received data?

1. ACK
2. FIN
3. RST
4. SYN

Correct Answer: 1

Explanation:

TCP uses acknowledgment, represented by the ACK flag and acknowledgment numbers, to confirm successful receipt of data. These acknowledgments allow TCP to track which bytes have been received and support reliable transmission. The SYN flag is associated with connection establishment, FIN is used during orderly connection termination, and RST can abruptly reset a connection. TCP combines these mechanisms with sequence numbers and retransmission logic to provide reliable, ordered communication between applications.

Question 11

Which protocol automatically assigns IP configuration to hosts?

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

Correct Answer: 2

Explanation:

DHCP, or Dynamic Host Configuration Protocol, automatically provides network configuration information to clients. Depending on the environment, a DHCP server can assign an IP address, subnet mask, default gateway, DNS server information, and lease duration. This eliminates the need to manually configure every host. DHCP commonly follows a discover, offer, request, and acknowledgment exchange when a client obtains an address. It is widely used in enterprise and campus networks because it simplifies large-scale host configuration.

Question 12

Which protocol translates domain names into IP addresses?

1. FTP
2. SMTP
3. DNS
4. Telnet

Correct Answer: 3

Explanation:

DNS, or Domain Name System, translates human-readable domain names into IP addresses and can also provide other types of name-related information. For example, a client can query DNS to determine the address associated with a web service hostname. DNS uses a hierarchical naming structure and can operate through recursive and authoritative servers. When applications cannot reach destinations by hostname but can reach them by IP address, DNS configuration and resolution should be investigated separately from basic network connectivity.

Question 13

Which OSPF packet establishes and maintains neighbor relationships?

1. Hello
2. Update
3. Request
4. Acknowledgment

Correct Answer: 1

Explanation:

OSPF Hello packets are used to discover and maintain neighboring OSPF routers. They are sent periodically through enabled OSPF interfaces and contain information used to determine whether neighboring routers can form or maintain an adjacency. Parameters such as area information, timers, and network characteristics must be compatible for appropriate neighbor relationships. If an expected OSPF neighbor does not reach the correct state, administrators should examine Hello-related parameters and interface connectivity before investigating more advanced routing behavior.

Question 14

Which OSPF area is the backbone area?

1. Area 1
2. Area 10
3. Area 100
4. Area 0

Correct Answer: 4

Explanation:

OSPF identifies Area 0 as the backbone area. Inter-area OSPF communication is designed around this backbone, and other areas normally connect to it either directly or through supported virtual-link mechanisms. Area 0 plays a central role in hierarchical OSPF design because it helps organize routing information between different areas. When troubleshooting inter-area routes, administrators should verify area assignments, router interfaces, and the connectivity of the OSPF backbone.

Question 15

Which OSPF router is elected on broadcast networks to reduce adjacency overhead?

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

Correct Answer: 1

Explanation:

The Designated Router, or DR, is elected on OSPF broadcast networks to reduce the number of full adjacencies that would otherwise be required between every participating router. Other routers establish full relationships with the DR and Backup Designated Router. The BDR provides redundancy if the DR becomes unavailable. DR and BDR elections are influenced by interface priority and router ID. Understanding these roles is important when troubleshooting OSPF neighbor relationships on multi-access Ethernet networks.

Question 16

Which Ethernet device learns source MAC addresses?

1. Router
2. Switch
3. Firewall
4. Modem

Correct Answer: 2

Explanation:

An Ethernet switch learns source MAC addresses from incoming frames and associates those addresses with the corresponding switch ports. This information is stored in the MAC address table and helps the switch make forwarding decisions. When a destination MAC address is known, the switch can forward the frame through the associated port instead of flooding it throughout the VLAN. If the destination address is unknown, normal switching behavior may involve flooding within the relevant broadcast domain.

Question 17

Which VLAN port mode carries traffic for multiple VLANs?

1. Access
2. Hybrid
3. Trunk
4. Monitor

Correct Answer: 3

Explanation:

A trunk port is designed to carry traffic belonging to multiple VLANs over a single physical link. VLAN identification can be maintained using tagging mechanisms such as IEEE 802.1Q. Trunks are commonly used between switches or between a switch and a router or other device that needs connectivity to multiple VLANs. An access port normally serves a single VLAN for end-device connectivity. Correct trunk configuration requires compatible VLAN permissions and tagging behavior on both connected devices.

Question 18

Which STP value determines the preferred path to the root bridge?

1. Bridge ID
2. Port ID
3. Path cost
4. System priority

Correct Answer: 3

Explanation:

STP uses path cost to evaluate the accumulated cost of reaching the root bridge. A switch compares available paths and generally prefers the path with the lower total root path cost. Port speed influences the default cost calculation, although administrators can configure values explicitly. Bridge ID and priority participate in root bridge election, while Port ID helps distinguish ports during STP decisions. Understanding path cost is essential when predicting which interfaces become forwarding or alternate paths in a spanning-tree topology.

Question 19

Which VLAN protocol allows routing between VLANs on a router?

1. 802.1Q
2. STP
3. LACP
4. LLDP

Correct Answer: 1

Explanation:

IEEE 802.1Q provides VLAN tagging that allows multiple VLANs to be carried across a shared trunk link. In router-on-a-stick designs, a physical router interface can use multiple subinterfaces, with each subinterface associated with a VLAN through 802.1Q configuration. The router then provides Layer 3 gateways for the VLANs and enables inter-VLAN communication. STP handles loop prevention, LACP handles link aggregation, and LLDP provides neighbor discovery, so they serve different networking functions.

Question 20

Which protocol bundles multiple Ethernet links into one logical interface?

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

Correct Answer: 3

Explanation:

LACP, or Link Aggregation Control Protocol, negotiates and manages link aggregation between compatible network devices. Multiple physical Ethernet links can be combined into a logical aggregated interface, increasing available bandwidth and providing redundancy. Traffic is distributed across member links according to the device’s load-balancing mechanism. If one physical member fails, the remaining links can continue carrying traffic. LACP is particularly useful in switch uplinks and other environments where both resilience and increased aggregate bandwidth are required.