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

 

Question 181.

Which protocol is used to automatically assign IPv4 addresses and related network parameters to hosts?

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

Correct Answer: 1. DHCP

Explanation:

DHCP automatically provides IPv4 configuration to hosts, including addresses, subnet masks, default gateways, and DNS server information. This simplifies network administration and reduces the risk of duplicate or incorrect manual addressing. DNS resolves names to IP addresses, FTP transfers files, and ARP resolves local IPv4 addresses to MAC addresses. DHCP is especially useful in networks where many endpoints connect and disconnect frequently.

Question 182.

Which DHCP message is normally sent by a client first when requesting an IPv4 address?

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

Correct Answer: 2. DHCPDISCOVER

Explanation:

A DHCP client normally begins the address-acquisition process by broadcasting a DHCPDISCOVER message. Available DHCP servers may respond with DHCPOFFER messages containing proposed addresses and other configuration parameters. The client then sends DHCPREQUEST, and the selected server confirms the lease using DHCPACK. Remembering this DORA sequence is useful for understanding and troubleshooting DHCP operations.

Question 183.

Which DHCP message is sent by a server to offer an available IPv4 address to a client?

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

Correct Answer: 3. DHCPOFFER

Explanation:

A DHCP server sends a DHCPOFFER after receiving a DHCPDISCOVER from a client. The offer usually contains an available IPv4 address and other network parameters. The client can then choose an offer and respond with DHCPREQUEST. The server finalizes the lease with DHCPACK. DHCPRELEASE is used when a client voluntarily releases an address, while DHCPNAK indicates that a requested configuration cannot be accepted.

Question 184.

Which DHCP message confirms that the server has successfully leased an address to a client?

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

Correct Answer: 4. DHCPACK

Explanation:

DHCPACK is the server’s acknowledgment that the requested address and related configuration have been successfully assigned to the client. After receiving the acknowledgment, the client can normally configure the interface and begin network communication. If the requested lease is invalid or cannot be granted, the server may instead send DHCPNAK.

Question 185.

Which function does a DHCP relay provide?

1. It forwards DHCP messages between clients and a server on different subnets
   2. It converts domain names into IP addresses
   3. It prevents Layer 2 loops
   4. It encrypts DHCP messages

Correct Answer: 1. It forwards DHCP messages between clients and a server on different subnets

Explanation:

A DHCP relay enables clients on one IP subnet to use a DHCP server located on another subnet. Since client DHCP messages initially use broadcasts that routers normally do not forward, the relay receives these messages and forwards them toward the configured server. This allows organizations to centralize DHCP services instead of deploying a separate server in every subnet.

Question 186.

Which protocol resolves a hostname such as router.example.com to an IP address?

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

Correct Answer: 2. DNS

Explanation:

DNS translates human-readable host and domain names into IP addresses. This allows users and applications to access network services without memorizing numerical addresses. DHCP supplies network configuration, ARP resolves local IPv4 addresses to MAC addresses, and ICMP provides control and diagnostic messaging. DNS is therefore critical to most modern IP networks.

Question 187.

Which DNS record type maps a hostname to an IPv4 address?

1. MX
   2. AAAA
   3. A
   4. PTR

Correct Answer: 3. A

Explanation:

A DNS A record maps a hostname to an IPv4 address. An AAAA record performs the equivalent function for IPv6. MX records identify mail servers, while PTR records support reverse DNS lookups from an IP address to a hostname. Understanding common DNS record types helps when configuring and troubleshooting services.

Question 188.

Which DNS record type maps a hostname to an IPv6 address?

1. A
   2. MX
   3. PTR
   4. AAAA**

Correct Answer: 4. AAAA

Explanation:

An AAAA record maps a hostname to an IPv6 address. The name comes from the fact that IPv6 addresses are four times the size of IPv4 addresses. A records are used for IPv4 mappings, MX records identify mail servers, and PTR records support reverse lookups. Dual-stack services may publish both A and AAAA records.

Question 189.

Which protocol is used to synchronize system clocks across an IP network?

1. NTP
   2. FTP
   3. SNMP
   4. ARP

Correct Answer: 1. NTP

Explanation:

Network Time Protocol, or NTP, synchronizes clocks between network devices and time servers. Accurate time is important for log correlation, troubleshooting, security analysis, authentication, and event sequencing. FTP transfers files, SNMP supports monitoring and management, and ARP resolves local IPv4 addresses. Consistent time across infrastructure makes operational data much more useful.

Question 190.

Which protocol is commonly used by network management systems to retrieve device status and counters?

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

Correct Answer: 2. SNMP

Explanation:

SNMP allows a network management platform to retrieve information from routers, switches, servers, and other devices. This can include interface counters, CPU usage, errors, and device status. Devices may also send notifications such as traps. DHCP, DNS, and STP have different roles and are not designed primarily for centralized network monitoring.

Question 191.

Which SNMP component contains structured definitions of manageable network information?

1. ARP table
   2. Routing table
   3. MIB
   4. VLAN database

Correct Answer: 3. MIB

Explanation:

A Management Information Base, or MIB, defines structured management objects that SNMP can query or manipulate. These objects represent information such as interface statistics, device status, and other operational values. MIB objects are identified through object identifiers. Routing, ARP, and VLAN tables contain network information but are not the SNMP definition structure itself.

Question 192.

Which SNMP message can a managed device send proactively to notify a management system about an event?

1. DNS query
   2. DHCPACK
   3. ARP request
   4. Trap**

Correct Answer: 4. Trap

Explanation:

An SNMP trap is an unsolicited notification sent by a managed device to a network management system when a significant event occurs. Examples can include interface failures or device alarms. This allows monitoring systems to receive alerts without continuously polling for every change. DNS, DHCP, and ARP messages perform unrelated functions.

Question 193.

Which protocol is preferred over Telnet for secure remote CLI management of a Huawei device?

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

Correct Answer: 1. SSH

Explanation:

SSH provides encrypted remote command-line access and protects credentials and session traffic from straightforward interception. Telnet does not provide comparable encryption and should generally be avoided on untrusted networks. SSH is widely used to manage routers, switches, servers, and security devices. Secure management should also include strong authentication and restricted source access.

Question 194.

Which file-transfer protocol uses UDP and provides only a simple, lightweight transfer mechanism?

1. SFTP
   2. TFTP
   3. HTTPS
   4. SCP

Correct Answer: 2. TFTP

Explanation:

TFTP is a simple file-transfer protocol that uses UDP and provides minimal features. It is often used in controlled environments for firmware images, boot files, or configuration transfers. TFTP lacks strong authentication and encryption, so it is not appropriate for sensitive transfers over untrusted networks. SFTP and SCP provide secure alternatives based on SSH.

Question 195.

Which Huawei VRP command can be used to verify whether the device can reach a remote IP address?

1. display ping
   2. test-route
   3. ping
   4. arp-test

Correct Answer: 3. ping

Explanation:

The ping command tests IP reachability by sending ICMP Echo Request messages and waiting for replies. It is commonly used as an initial troubleshooting tool because it can quickly determine whether basic Layer 3 communication is working. A failed ping does not always prove the destination is offline, since ICMP may be filtered, but it remains a valuable diagnostic command.

Question 196.

Which command can help identify the sequence of Layer 3 hops toward a remote destination?

1. display vlan
   2. display arp
   3. save
   4. tracert**

Correct Answer: 4. tracert

Explanation:

The tracert command helps identify the routers or Layer 3 hops that traffic traverses toward a destination. It can help locate where connectivity begins to fail or where unexpected routing occurs. Some intermediate devices may not respond to traceroute probes, so missing entries do not always indicate complete failure. It is often used together with ping and routing-table inspection.

Question 197.

Which Huawei VRP command displays the IPv4 routing table?

1. display ip routing-table
   2. display mac-address
   3. display vlan
   4. display lldp neighbor

Correct Answer: 1. display ip routing-table

Explanation:

The display ip routing-table command shows IPv4 routes known to a Huawei VRP device. The output can include destination prefixes, route sources, preferences, metrics, next hops, and outbound interfaces. It is one of the most important commands for troubleshooting Layer 3 connectivity because it reveals whether the router has an appropriate path to the destination.

Question 198.

Which Huawei VRP command displays entries that map IPv4 addresses to MAC addresses?

1. display dns
   2. display arp
   3. display ospf peer
   4. display current-configuration

Correct Answer: 2. display arp

Explanation:

The display arp command shows ARP entries that associate IPv4 addresses with MAC addresses. These mappings are required for local Ethernet delivery to hosts or next hops. Reviewing the ARP table can help diagnose local connectivity problems, duplicate addressing, or unresolved next-hop information.

Question 199.

Which Huawei VRP command displays dynamically learned and configured MAC address entries on a switch?

1. display ip interface brief
   2. display route
   3. display mac-address
   4. display clock

Correct Answer: 3. display mac-address

Explanation:

The display mac-address command shows MAC address table entries on Huawei switches. It can reveal which interfaces and VLANs are associated with specific MAC addresses. This is useful for locating endpoints, validating Layer 2 forwarding, and diagnosing connectivity issues. Routing, interface, and clock commands provide different operational information.

Question 200.

A Huawei switch port is physically up, but a host connected to it cannot communicate with other devices in the expected VLAN. Which configuration should be checked first?

1. NTP server address
   2. OSPF router ID
   3. DNS configuration
   4. Port link type and VLAN assignment**

Correct Answer: 4. Port link type and VLAN assignment

Explanation:

If the physical link is up but VLAN connectivity is incorrect, the switch port’s Layer 2 configuration should be checked first. An end-user port should normally use the appropriate access link type and be assigned to the intended VLAN. If the port is configured as the wrong link type or assigned to the wrong VLAN, the host may be placed in an unexpected broadcast domain. NTP, OSPF, and DNS are less likely to explain this Layer 2 symptom.

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