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

 

Question 81

Which OSPF state indicates completed adjacency?

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

Correct Answer: 1

Explanation:

The Full state indicates that two OSPF routers have successfully synchronized their link-state databases and established a complete adjacency. At this stage, the routers have exchanged the required topology information and can operate normally as OSPF neighbors. Other states represent earlier stages of neighbor discovery or database synchronization. For example, Init indicates that a Hello packet has been received without confirming bidirectional communication, while ExStart is involved in database synchronization preparation. The Full state is therefore an important indicator when verifying healthy OSPF adjacency.

Question 82

Which IPv4 prefix provides 14 usable host addresses?

1. /26
2. /28
3. /27
4. /29

Correct Answer: 2

Explanation:

A /28 IPv4 subnet contains 16 total addresses. Two addresses are normally reserved for the network and broadcast addresses, leaving 14 usable host addresses. A /27 provides 30 usable addresses, while /29 provides only 6. A /26 provides 62 usable addresses. Understanding subnet sizes is important when designing IP networks because the prefix length determines both the number of available addresses and the size of each subnet. This calculation is frequently used when allocating addresses to LAN segments.

Question 83

Which route is selected when multiple prefixes match a destination?

1. Oldest route
2. Highest metric
3. Shortest prefix
4. Longest prefix

Correct Answer: 4

Explanation:

Routers use longest-prefix matching when several routing-table entries match the destination address. The route with the most specific prefix is selected because it represents the narrowest matching destination range. For example, a /24 route is more specific than a /16 route covering the same destination. After determining the longest matching prefix, other route-selection criteria may be considered when appropriate. Understanding this process is essential when troubleshooting unexpected forwarding decisions and overlapping network advertisements.

Question 84

Which interface enables router-on-a-stick VLAN routing?

1. Loopback interface
2. Subinterface
3. Console interface
4. Management interface

Correct Answer: 2

Explanation:

A router subinterface can be configured to support inter-VLAN routing over a single physical Ethernet connection. In a router-on-a-stick design, separate subinterfaces are associated with different VLANs, allowing the router to provide Layer 3 gateways for multiple VLANs through one physical interface. VLAN tagging is used to distinguish traffic belonging to different VLANs. This approach can simplify small network designs because multiple VLANs can share one physical router link instead of requiring a separate physical interface for every VLAN.

Question 85

Which RSTP feature rapidly transitions an edge port?

1. PortFast
2. Edge port
3. Root guard
4. Loop guard

Correct Answer: 2

Explanation:

An RSTP edge port is intended for connection to an end device rather than another switching device. It can transition rapidly toward forwarding because the switch assumes that the edge connection will not create a Layer 2 loop. Edge-port configuration is commonly appropriate for hosts such as computers and printers. If a switching device is incorrectly connected to an edge port, the network may experience topology problems. Therefore, edge-port settings should be applied only where the network design supports them.

Question 86

Which ACL rule characteristic determines matching order?

1. Rule sequence
2. Interface speed
3. VLAN number
4. MAC aging

Correct Answer: 1

Explanation:

ACL rules are evaluated according to their configured ordering or sequence, subject to the specific ACL implementation and matching behavior. When traffic matches a rule, the associated permit or deny action is applied. Therefore, placing a broad rule before a more specific rule can produce unexpected results. Administrators should design ACL entries carefully and verify their order when troubleshooting filtering behavior. Understanding rule sequence is especially important when multiple entries contain overlapping source, destination, or service conditions.

Question 87

Which NAT type maps one private address to one public address?

1. PAT
2. Dynamic NAT
3. Static NAT
4. Easy IP

Correct Answer: 3

Explanation:

Static NAT creates a fixed one-to-one mapping between an internal address and an external address. The mapping remains consistent, making static NAT useful when an internal resource needs a predictable externally reachable address. Dynamic NAT also translates addresses but generally allocates public addresses from a configured pool. PAT allows many internal hosts to share public addresses by using different transport-layer port numbers. Choosing the correct NAT method depends on whether fixed mappings, address pooling, or shared public addressing is required.

Question 88

Which FTP channel carries file transfer data?

1. Control channel
2. Data channel
3. Login channel
4. Command shell

Correct Answer: 2

Explanation:

FTP uses a control connection for commands and a separate data connection for transferring files or directory information. The separation allows commands such as login and file operations to travel through the control channel while the actual transferred content uses the data channel. Understanding this distinction is useful when troubleshooting FTP through firewalls or ACLs because both control and data communication may need appropriate handling. FTP therefore differs from protocols that use a single connection for both control information and application data.

Question 89

Which WLAN identifier is advertised to wireless clients?

1. SSID
2. BSSID
3. VLAN ID
4. Radio ID

Correct Answer: 1

Explanation:

The SSID identifies a wireless network from the user’s perspective and is commonly displayed when nearby WLANs are discovered. It represents the service name that clients select when connecting to a wireless network. The BSSID is associated with a specific wireless access point radio interface, while VLAN IDs identify Layer 2 network segments. Administrators can configure WLAN services with appropriate SSIDs and security policies to provide different wireless services for users or device groups.

Question 90

Which protocol establishes a PPPoE session?

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

Correct Answer: 3

Explanation:

PPPoE, or Point-to-Point Protocol over Ethernet, allows PPP sessions to operate over Ethernet networks. Its operation includes a discovery phase followed by session establishment, after which PPP mechanisms can perform authentication and network-layer negotiation. PPPoE is commonly associated with broadband access environments. Understanding its two-stage operation helps administrators distinguish discovery problems from later PPP negotiation issues. The protocol combines Ethernet transport with PPP capabilities such as authentication and session management.

Question 91

Which IPv6 address prefix identifies link-local addresses?

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

Correct Answer: 1

Explanation:

IPv6 link-local addresses use the FE80::/10 prefix. These addresses are intended for communication on the local link and are not routed across different network segments. Link-local addressing is important because IPv6-enabled interfaces can use it for local neighbor discovery and other functions even when a globally routable address is unavailable. The FC00::/7 range is associated with unique local addresses, 2000::/3 covers global unicast addressing, and FF00::/8 identifies multicast addresses.

Question 92

Which ICMPv6 message helps discover an IPv6 router?

1. Neighbor Advertisement
2. Router Solicitation
3. Echo Reply
4. Destination Unreachable

Correct Answer: 2

Explanation:

Router Solicitation is an ICMPv6 message used by hosts to request router information from routers on the local link. Routers can respond with Router Advertisement messages containing information useful for IPv6 configuration and network operation. This mechanism is part of IPv6 Neighbor Discovery. Neighbor Advertisement serves a different function related to neighbor discovery, while Echo Reply is associated with connectivity testing. Understanding ICMPv6 message roles is important when diagnosing IPv6 address configuration and local connectivity.

Question 93

Which IPv6 mechanism can automatically configure a host address?

1. Static assignment
2. NAT translation
3. SLAAC
4. ARP

Correct Answer: 3

Explanation:

SLAAC, or Stateless Address Autoconfiguration, allows an IPv6 host to configure an address using information learned from Router Advertisement messages. It can provide automatic addressing without requiring a traditional DHCP server for the address assignment process. The host combines network-prefix information with an interface identifier according to the applicable IPv6 procedures. SLAAC is widely used in IPv6 networks and can operate alongside DHCPv6 when additional configuration information is required.

Question 94

Which WAN protocol supports PAP and CHAP authentication?

1. Ethernet
2. PPP
3. Frame Relay
4. MPLS

Correct Answer: 2

Explanation:

PPP supports authentication mechanisms such as PAP and CHAP. Authentication occurs during PPP session establishment and helps verify the identity of the connecting peer. PAP uses a simpler exchange, while CHAP uses a challenge-response process. PPP also provides mechanisms for negotiating link parameters and network-layer protocols. These capabilities make PPP suitable for point-to-point WAN connections where authentication and link negotiation are required. Administrators configuring PPP should ensure that authentication settings are compatible on both ends.

Question 95

Which MPLS device adds labels to incoming IP traffic?

1. LSR
2. LER
3. PE host
4. CE router

Correct Answer: 2

Explanation:

A Label Edge Router, or LER, operates at the edge of an MPLS network and can classify incoming traffic and apply MPLS labels. Once traffic enters the MPLS domain, Label Switch Routers can forward packets based on their labels. The edge router therefore provides an important transition between conventional IP forwarding and label-based forwarding. MPLS labels allow routers within the provider network to make forwarding decisions without repeatedly relying on the complete destination IP lookup process.

Question 96

Which Huawei command tests reachability to a destination?

1. tracert
2. telnet
3. ping
4. display arp

Correct Answer: 3

Explanation:

The ping command tests IP reachability by sending echo requests toward a destination and examining the returned responses. It is one of the first diagnostic tools administrators use when investigating connectivity problems. A successful response indicates that communication is possible under the tested conditions, while failure may require further investigation of addressing, routing, filtering, or interface status. tracert is instead used to examine the forwarding path toward a destination.

Question 97

Which diagnostic command traces the forwarding path?

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

Correct Answer: 2

Explanation:

The Huawei tracert command is used to trace the path taken toward a destination. It can help identify where packets stop progressing when end-to-end connectivity is unavailable or degraded. Each responding hop provides information about intermediate Layer 3 devices along the path. Administrators can use this information together with routing-table and interface checks to narrow down a forwarding problem. Unlike ping, which primarily tests reachability, tracert provides visibility into the sequence of intermediate hops.

Question 98

Which device role typically connects an enterprise LAN to a WAN provider?

1. Core switch
2. Access point
3. CE router
4. Wireless station

Correct Answer: 3

Explanation:

A Customer Edge, or CE, router is typically positioned at the customer side of a service-provider WAN connection. It connects the customer’s internal network to the provider-facing network and participates in the routing or forwarding design required by the WAN service. In MPLS-based deployments, the CE commonly exchanges routes with a provider-edge device. Understanding CE and PE roles helps administrators interpret provider-network diagrams and troubleshoot connectivity between enterprise sites.

Question 99

Which Python keyword repeats execution while a condition remains true?

1. for
2. while
3. def
4. class

Correct Answer: 2

Explanation:

The Python while statement repeatedly executes a block of code as long as its controlling condition evaluates to true. It is useful when the number of iterations is not necessarily known beforehand. The for statement is commonly used to iterate through a sequence or other iterable, while def defines a function and class defines a class. In network automation, loops can be used to process multiple devices, interfaces, configuration records, or collected operational results.

Question 100

Which SDN principle separates control from forwarding?

1. Control-plane separation
2. Address translation
3. Packet fragmentation
4. Route summarization

Correct Answer: 1

Explanation:

A fundamental SDN principle is the separation of the control plane from the forwarding or data plane. Instead of requiring each forwarding device to independently make all control decisions, centralized or logically centralized software can manage network behavior and install forwarding policies. This separation enables programmability, centralized policy management, and greater automation. The forwarding devices continue handling packets according to the rules they receive. This architectural model distinguishes SDN from traditional distributed control approaches.