Pass the Huawei HCIA-Datacom H12-811_V2.0 Questions and answers with Dumpstech

The establishment of an SSH connection includes multiple mandatory phases that ensure both secure communication and authenticated access. First, the SSH client and server perform version negotiation to determine a mutually supported SSH protocol version. Then they carry out algorithm negotiation, during which they agree on the encryption algorithm, key exchange algorithm, integrity algorithm, and other security parameters to be used for the session.

After that, the peers perform key exchange, which is used to derive shared session keys securely over an insecure network. This stage is essential because it enables subsequent communication to be encrypted and protected against interception. Finally, once the secure channel has been established, user authentication is performed so that the server can verify the identity of the client user. This can be done using a password, public key, or other supported authentication method. Therefore, all four options are required phases in the SSH connection establishment process. HCIA-Datacom emphasizes these steps because SSH is a core secure management protocol used to replace insecure protocols such as Telnet and FTP in modern network operation and maintenance.

ospf 1 → [R1]

area 0 → [R1-ospf-1]

network 10.0.12.1 0.0.0.0 → [R1-ospf-1-area-0.0.0.0]

ospf enable 1 area 0 → [R1-GE0/0/0]

Huawei devices support two common ways to enable OSPF on an interface.

The first method is the process-based method . In this method, you first enter system view, then enter the OSPF process view using ospf 1, so this command belongs to [R1] . After that, you enter the area view using area 0, so this command belongs to [R1-ospf-1] . Inside the area view, the command network 10.0.12.1 0.0.0.0 is used to match the interface with IP address 10.0.12.1, so it belongs to [R1-ospf-1-area-0.0.0.0] .

The second method is the interface-based method . In this method, OSPF is enabled directly under the interface using ospf enable 1 area 0, so this command belongs to [R1-GE0/0/0] .

This question tests the difference between global OSPF process configuration and direct interface OSPF enabling , both of which are standard Huawei OSPF configuration methods.

VTY interfaces provide remote terminal sessions to the device. The command protocol inbound all allows the interactive remote-login protocols supported by that VTY implementation, notably Telnet and SSH/STelnet. FTP is not a VTY terminal-login protocol. FTP is a file-transfer service that uses its own server/client process, TCP sessions, authentication, and file system permissions; enabling FTP service does not make an FTP user consume a VTY terminal line in the same manner as a Telnet or SSH CLI session. Therefore, even though the word all broadens the VTY ' s permitted terminal access protocols, it does not mean that FTP users log in through those five VTY interfaces. Huawei troubleshooting documentation specifically treats protocol inbound all as satisfying Telnet and SSH access requirements. The statement incorrectly groups FTP with the VTY login protocols and claims that all three types of users can use the five VTY interfaces. That conclusion is false. The verified answer is B.

OSPF defines five protocol packet types: Hello, Database Description (DD), Link State Request (LSR), Link State Update (LSU), and Link State Acknowledgment (LSAck). A Link State Advertisement, or LSA, is not itself an OSPF packet type. LSAs are data structures that describe topology or routing information and are carried inside OSPF packets, especially LSU packets. For example, an LSU packet may transport one or more LSAs to a neighbor, and an LSAck packet acknowledges receipt of LSAs. Hello packets discover and maintain neighbor relationships, DD packets summarize LSDB contents during synchronization, and LSR packets request specific missing LSAs. The distinction between an LSA and an LSU is important in Huawei Datacom study material because they operate at different conceptual levels: an LSA is routing information, whereas an LSU is the OSPF protocol packet that transports that information. Therefore, among the choices, LSA is the item that is not one of the five OSPF packet types. The correct answer is B.

In an Eth-Trunk working in manual mode , multiple physical member links are bundled into one logical interface to provide higher bandwidth and link redundancy. If one of four 1 Gbit/s member links fails, the Eth-Trunk does not go down as long as at least one valid member link remains active. Therefore, statement A is correct. Since one link has failed and three member links remain available, the total available bandwidth becomes 3 Gbit/s , so statement B is also correct.

Statement C is incorrect because the traffic originally hashed to the failed link is not permanently stopped. Instead, after the link failure is detected, traffic is redistributed across the remaining active member links according to the trunk load-balancing mechanism. Statement D is also incorrect because Eth-Trunk provides link-level redundancy. Existing upper-layer sessions such as TCP are not necessarily interrupted and re-established simply because one member link fails. HCIA-Datacom emphasizes that Eth-Trunk improves reliability and bandwidth utilization by allowing traffic to continue across surviving links when a single member fails. This is one of the main advantages of link aggregation in campus and data center switching networks.

The source key marks this statement TRUE, but the topology makes that answer technically incorrect. R1 is shown with interface address 10.0.12.1/24, which automatically installs a directly connected route to 10.0.12.0/24. On Huawei VRP, a direct route has preference 0, whereas a static route has preference 60 unless another value is configured. The two commands do configure two static routes with the same preference, and equal-preference static routes can support load balancing when they are the best routes to a destination. Here, however, both static routes are for the same prefix that R1 already owns as a connected network. The direct route has a higher priority because its preference value is smaller, so it is selected in the active IP routing table instead of the two preference-60 static routes. Therefore the assertion that R1 has two active equal-cost routes to 10.0.12.0/24 is FALSE as the question and exhibit are written. The verified answer is B, and the original source key A should be corrected.

STP and link aggregation are not mutually exclusive technologies. They solve different problems and can coexist on the same switch. Link aggregation combines multiple physical Ethernet links into a logical Eth-Trunk, increasing available bandwidth and providing member-link redundancy. STP or a related spanning-tree protocol prevents Layer 2 loops by calculating a loop-free active topology and can treat an Eth-Trunk as a logical interface. In a well-designed campus network, several physical links between two switches may first be aggregated into one Eth-Trunk, while STP operates over that logical link together with other Layer 2 paths. Conversely, if separate redundant links are not aggregated, STP may block one or more paths to prevent a loop. Choosing link aggregation can use parallel member links more efficiently than allowing STP to block individual links, but enabling one function does not prohibit use of the other elsewhere on the device. Therefore, the assertion that only STP or link aggregation can be configured on a device at one time is incorrect. The verified answer is FALSE, option B.

The MAC address table in the exhibit contains learned entries for 0050-5600-0001 on GE1/0/1 and 0050-5600-0002 on GE1/0/2, but there is no entry for destination MAC 0050-5600-0003. A frame arriving from PC1 on GE1/0/1 with an unknown unicast destination is therefore flooded within the VLAN. Huawei Ethernet switching behavior sends the unknown unicast frame through all other eligible Layer 2 interfaces in that VLAN, while never sending it back through the ingress interface. In the shown topology, the remaining interfaces are GE1/0/2, GE1/0/3, and GE1/0/4. Consequently, the frame is sent through options A, D, and B respectively. GE1/0/1, option C, is excluded because it is the ingress interface from which SW1 received the frame. If SW1 later learns 0050-5600-0003 on a specific port, subsequent unicast frames can be forwarded only through that learned port. For the empty destination entry shown, the verified answer is A, B, and D.

During modulation, the transmitter maps digital information onto certain physical characteristics of a carrier signal so that the information can be transmitted over the air. The three classic carrier parameters that can be modified are amplitude , frequency , and phase . Therefore, options A , B , and D are correct.

Amplitude modulation changes the strength of the carrier wave. Frequency modulation changes the oscillation rate of the carrier. Phase modulation changes the phase angle of the carrier relative to a reference. Modern wireless communication systems often combine these parameters, especially amplitude and phase, in complex digital modulation schemes such as QPSK, 16-QAM, 64-QAM, or higher-order QAM used in WLAN standards. Option C , channel, is not a carrier parameter modified during modulation. A channel refers to a frequency resource or spectrum allocation used for communication, not a physical waveform characteristic being directly altered to encode bits. HCIA-Datacom introduces these basic wireless concepts to help learners understand how WLAN signals are transmitted, how data rate improvements are achieved, and why different modulation methods have different requirements for signal quality and interference resistance.

The root path cost (RPC) of a switch is the total path cost from that switch to the root bridge along the selected spanning-tree path. Since SW1 is given as the root bridge, its RPC is 0. Each link in the topology has a path cost of 20 . To determine SW4’s RPC, you identify the shortest active STP path from SW4 to SW1.

Based on the topology used in the question, SW4 reaches SW1 through a path containing two links . Therefore, the total root path cost is 20 + 20 = 40 , which makes option B correct. This is a standard STP calculation. HCIA-Datacom uses RPC as one of the main comparison parameters in root-port election on non-root switches. A lower RPC means a better path toward the root bridge. If multiple candidate ports have the same RPC, the switch then compares the sender’s bridge ID and port ID. This question checks whether the learner understands that RPC is cumulative across the spanning-tree forwarding path and is not simply the cost of a single directly connected link unless the switch is directly attached to the root bridge.