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

 

Question 261

Which protocol resolves an IPv4 address to a MAC address?

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

Correct Answer: 1

Explanation:

ARP, or Address Resolution Protocol, is used to discover the MAC address associated with a known IPv4 address on a local network. When a device needs to communicate with another host but only knows its IP address, it sends an ARP request as a broadcast. The device owning that IP address responds with its MAC address. The sender can then use that information to construct and transmit the Ethernet frame. ARP information is commonly stored temporarily in an ARP cache to reduce repeated requests. DNS, DHCP, and FTP perform different networking functions.

Question 262

Which device primarily operates at the OSI Network layer?

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

Correct Answer: 2

Explanation:

A router primarily operates at Layer 3, known as the Network layer, of the OSI model. Routers use logical addresses such as IPv4 or IPv6 addresses to determine where packets should be forwarded. They maintain routing information and select appropriate paths toward remote networks. Hubs operate mainly at the Physical layer, repeaters regenerate physical signals, and traditional bridges primarily operate at the Data Link layer. Because routers connect different IP networks and make forwarding decisions based on network-layer information, they are essential components in routed network infrastructures and enterprise communication environments.

Question 263

Which command displays the current interface status on Huawei VRP?

1. display version
2. display startup
3. display interface brief
4. display users

Correct Answer: 3

Explanation:

The Huawei VRP command display interface brief provides a summarized view of network interface conditions. It helps administrators quickly identify interface names, physical status, protocol status, and other basic operational information. This command is especially useful during troubleshooting because it allows multiple interfaces to be reviewed without displaying extensive configuration details. The display version command provides software and hardware information, while display startup focuses on startup configuration files. The display users command provides information about connected users. Therefore, display interface brief is the appropriate command for quickly checking interface status.

Question 264

Which IPv4 address belongs to the private address space?

1. 8.8.8.8
2. 172.32.5.10
3. 169.254.10.2
4. 192.168.20.15

Correct Answer: 4

Explanation:

The IPv4 address 192.168.20.15 belongs to the private address range 192.168.0.0/16. Private IPv4 addresses are intended for use inside local networks and are not directly routable across the public Internet. The other major private ranges are 10.0.0.0/8 and 172.16.0.0/12. The address 172.32.5.10 is outside the private 172.16 through 172.31 range. The address 169.254.10.2 belongs to the link-local range, while 8.8.8.8 is publicly routable. Private addressing is commonly combined with NAT when internal devices require Internet connectivity.

Question 265

What is the main purpose of a default gateway?

1. Reach remote networks
2. Assign hostnames
3. Encrypt application data
4. Allocate MAC addresses

Correct Answer: 1

Explanation:

A default gateway provides a host with a next-hop destination for traffic that must leave the local subnet. When a device determines that the destination IP address belongs to another network, it forwards the packet toward its configured default gateway. In most LAN environments, this gateway is the IP address of a router interface connected to the local network. Without a properly configured gateway, a host can generally communicate with devices on its local subnet but cannot reach remote networks. Hostname assignment, encryption, and MAC address allocation are handled by other network services and mechanisms.

Question 266

Which protocol automatically assigns IP configuration to hosts?

1. SNMP
2. DHCP
3. NTP
4. Telnet

Correct Answer: 2

Explanation:

DHCP, or Dynamic Host Configuration Protocol, automatically provides network configuration parameters to client devices. A DHCP server can assign an IP address, subnet mask, default gateway, DNS server information, and lease duration. This automation simplifies network administration because devices do not need to be manually configured individually. DHCP also helps centralize address management and reduce the possibility of accidental duplicate addresses. SNMP is primarily used for network monitoring, NTP synchronizes system clocks, and Telnet provides remote terminal access. Therefore, DHCP is the protocol specifically designed to automate IP configuration for network hosts.

Question 267

Which routing protocol is classified as a link-state protocol?

1. RIP
2. BGP
3. OSPF
4. Static routing

Correct Answer: 3

Explanation:

OSPF, or Open Shortest Path First, is classified as a link-state routing protocol. OSPF routers exchange information about network links and maintain a link-state database describing the topology of the routing domain. Each router uses the Shortest Path First algorithm to calculate appropriate routes based on this database. RIP is traditionally categorized as a distance-vector protocol, while BGP is a path-vector protocol. Static routing does not dynamically calculate routes. OSPF is commonly used in enterprise environments because it supports hierarchical areas, efficient route calculation, and relatively fast adaptation to network topology changes.

Question 268

Which subnet mask provides 30 usable IPv4 host addresses?

1. 255.255.255.224
2. 255.255.255.240
3. 255.255.255.248
4. 255.255.255.192

Correct Answer: 1

Explanation:

The subnet mask 255.255.255.224 represents a /27 prefix. A /27 IPv4 subnet contains 32 total addresses because five host bits remain available. Normally, one address is reserved as the network address and another is reserved as the broadcast address. This leaves 30 addresses available for hosts. A /28 subnet provides 14 usable addresses, a /29 provides 6, and a /26 provides 62 usable addresses. Therefore, 255.255.255.224 is the appropriate subnet mask when a network needs to support exactly 30 usable IPv4 host addresses within each subnet.

Question 269

Which mechanism prevents Layer 2 switching loops?

1. NAT
2. STP
3. ARP
4. DHCP

Correct Answer: 2

Explanation:

STP, or Spanning Tree Protocol, is designed to prevent Layer 2 loops in Ethernet switching networks. Redundant links between switches provide resilience but can also create multiple active paths that cause broadcast storms, duplicate frames, and unstable MAC address tables. STP evaluates the available paths and places selected redundant links into a blocking state while retaining them as potential backups. If an active path fails, an alternate path can become available according to the spanning-tree process. NAT handles address translation, ARP resolves addresses, and DHCP provides configuration, so STP specifically addresses switching loops.

Question 270

Which VLAN type is commonly used for management traffic?

1. Voice VLAN
2. Guest VLAN
3. Management VLAN
4. Native VLAN

Correct Answer: 3

Explanation:

A management VLAN is commonly used to carry administrative traffic associated with network devices. Administrators can configure a management interface within this VLAN and use services such as SSH or SNMP to manage and monitor switches, routers, and other infrastructure. Separating management traffic from normal user traffic can improve network organization and provide additional control over administrative access. A voice VLAN is intended for voice devices, while a guest VLAN commonly isolates guest users. The native VLAN has a different purpose on 802.1Q trunk links. Therefore, the management VLAN is specifically associated with device administration.

Question 271

Which Ethernet feature adds VLAN information to frames?

1. 802.1Q tagging
2. MAC filtering
3. Port mirroring
4. Link aggregation

Correct Answer: 1

Explanation:

IEEE 802.1Q tagging adds VLAN identification information to Ethernet frames. This allows a single trunk link to carry traffic belonging to multiple VLANs between compatible network devices. The VLAN identifier helps receiving switches determine which logical broadcast domain should process the frame. MAC filtering controls access according to MAC addresses, port mirroring copies traffic for monitoring or analysis, and link aggregation combines multiple physical connections into a logical link. Therefore, 802.1Q tagging is directly associated with identifying VLAN membership within Ethernet frames and supporting VLAN traffic across trunk connections.

Question 272

Which IPv6 address type is used for one-to-nearest communication?

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

Correct Answer: 3

Explanation:

IPv6 anycast provides a communication method in which the same address can be assigned to multiple interfaces or nodes. When traffic is sent to an anycast address, routing mechanisms deliver the packet to the topologically nearest available destination according to the routing information. This can be useful for distributed services where several devices provide the same function. Unicast identifies a particular interface, while multicast sends traffic to multiple members of a defined group. IPv6 does not use traditional broadcast communication. Anycast therefore supports efficient one-to-nearest communication across an IPv6 network.

Question 273

Which protocol is commonly used for secure remote CLI access?

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

Correct Answer: 3

Explanation:

SSH, or Secure Shell, is commonly used to provide secure remote command-line access to network devices and servers. SSH encrypts the communication between the administrator and the remote device, helping protect authentication credentials and management information from interception. Network administrators can use SSH to configure, monitor, and troubleshoot Huawei devices remotely. HTTP is generally associated with web communication, FTP is designed for file transfers, and TFTP provides a simpler file-transfer mechanism without comparable security features. Therefore, SSH is an appropriate protocol when secure remote CLI-based network management is required.

Question 274

Which technology combines multiple physical links into one logical link?

1. VLAN
2. Eth-Trunk
3. DHCP
4. VRRP

Correct Answer: 2

Explanation:

Huawei Eth-Trunk technology combines multiple physical Ethernet interfaces into one logical interface. This configuration can increase aggregate bandwidth and provide redundancy between connected network devices. Traffic can be distributed across the member links according to the configured load-balancing method. If one physical member fails, the remaining active members can continue carrying traffic, helping maintain connectivity. VLAN technology creates logical broadcast domains, DHCP provides IP configuration, and VRRP provides gateway redundancy. Eth-Trunk is therefore particularly useful when network designers need greater link capacity and resilience without treating every physical connection as a separate logical interface.

Question 275

Which protocol provides gateway redundancy using a virtual IP address?

1. FTP
2. VRRP
3. DNS
4. LLDP

Correct Answer: 2

Explanation:

VRRP, or Virtual Router Redundancy Protocol, provides gateway redundancy by allowing multiple routers to participate in a virtual router group. The routers share a virtual IP address that hosts can use as their default gateway. Normally, one router performs the forwarding role, while another participating router can take over if the active router becomes unavailable. This arrangement improves gateway availability without requiring administrators to change the default gateway configured on every host. FTP provides file transfer, DNS resolves names, and LLDP provides neighbor information. VRRP specifically addresses redundant default-gateway operation.

Question 276

Which command saves the current Huawei configuration?

1. save
2. reset saved-configuration
3. reboot
4. quit

Correct Answer: 1

Explanation:

The Huawei VRP save command stores the current running configuration in the device’s saved configuration file. This step is important because configuration changes made during a session may otherwise be lost when the device is restarted. Administrators typically save configurations after completing and verifying changes so that the desired settings are preserved across reboots. The reset saved-configuration command performs a different operation involving saved configuration data, while reboot restarts the device. The quit command exits the current configuration or view context. Therefore, save is the appropriate command for preserving the current configuration.

Question 277

Which protocol advertises directly connected device information?

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

Correct Answer: 3

Explanation:

LLDP, or Link Layer Discovery Protocol, allows network devices to advertise identification and capability information to directly connected neighboring devices. Information exchanged through LLDP can help administrators identify neighboring equipment, interfaces, device capabilities, and physical network relationships. This information is particularly useful when documenting network topology or troubleshooting unexpected connections. OSPF and RIP are routing protocols that exchange route information, while BGP is primarily used to exchange reachability information between autonomous systems. LLDP is therefore focused on neighbor discovery rather than route calculation, making it useful for understanding the physical and logical relationships between network devices.

Question 278

Which NAT method maps many private hosts to one public address?

1. Static NAT
2. Dynamic NAT
3. PAT
4. Route redistribution

Correct Answer: 3

Explanation:

PAT, or Port Address Translation, allows multiple private hosts to use a single public IPv4 address simultaneously. It distinguishes individual communication sessions by translating transport-layer port information along with the private source address. This approach is especially useful because organizations often have many internal devices but only a limited number of public IPv4 addresses. Static NAT generally creates fixed one-to-one mappings, while dynamic NAT allocates addresses from a public address pool. Route redistribution has a completely different purpose involving routing information. PAT therefore provides efficient public-address sharing for many internal network clients.

Question 279

Which ICMP message is associated with a successful ping reply?

1. Echo Request
2. Echo Reply
3. Redirect
4. Time Exceeded

Correct Answer: 2

Explanation:

An ICMP Echo Reply is the response generated when a destination successfully receives an ICMP Echo Request and is configured to respond. The ping utility commonly sends Echo Requests to test whether an IP destination is reachable and responsive. When the destination replies with an Echo Reply, the sender can confirm that the request reached the target and that a response returned successfully. An Echo Request initiates the test, while Redirect and Time Exceeded messages serve different purposes. Therefore, Echo Reply is the ICMP message directly associated with a successful response to a standard ping request.

Question 280

Which routing table entry is typically used when no specific route matches?

1. Host route
2. Connected route
3. Default route
4. Loopback route

Correct Answer: 3

Explanation:

A default route is used when a router cannot find a more specific matching route for the destination address. In IPv4, the default route is commonly represented as 0.0.0.0/0, while IPv6 uses ::/0. The router forwards traffic matching this general route toward the configured next hop or outgoing interface. Connected routes describe networks directly attached to the router, host routes identify individual destinations, and loopback routes relate to loopback interfaces. Default routes are commonly configured on network-edge devices so traffic destined for unknown external networks can be forwarded toward an upstream router or provider.