Pass the Huawei HCIA-Datacom H12-811_V1.0 Questions and answers with CertsForce

STP Forwarding State:In the forwarding state, a port can:

Send and receive BPDUs (Bridge Protocol Data Units).

Learn source MAC addresses from incoming frames.

Forward frames to their destinations​​.

Analysis of Options:

Option A: Correct. Ports in the forwarding state send BPDUs to maintain network topology.

Option B: Incorrect. Ports in the forwarding state do learn source MAC addresses.

Option C: Correct. Ports in the forwarding state receive BPDUs.

Option D: Correct. Ports in the forwarding state forward data frames.

Correct Answer:B. A port in a forwarding state does not learn the source MAC address of a frame is incorrect.

In OSPF networks, a DR (Designated Router) is elected for each broadcast domain, such as each Ethernet segment. Given the topology where there are multiple Ethernet segments, a DR will be elected in each segment, resulting in three DRs based on the configuration and network design​.

Detailed Explanation:

Dynamic routing protocols, such as OSPF and RIP, automatically discover and generate routes, adjusting when network topology changes occur. This helps in reducing the manual configuration required by static routes and ensures that the network adapts efficiently to changes such as link failures or the addition of new routes.

Comprehensive and Detailed Explanation:

A default route is used when no specific route matches a destination IP.

The correct syntax for a default static route is:

ip route-static 0.0.0.0 0.0.0.0

✅ Correct Option:

A. [Huawei] ip route-static 0.0.0.0 0.0.0.0 192.168.1.1

This correctly sets 192.168.1.1 as the next-hop for all unknown destinations.

❌ Incorrect Options:

B. 0.0.0.0 0.0.0.0 0.0.0.0 → Invalid because 0.0.0.0 cannot be a next-hop.

C. 0.0.0.0 255.255.255.255 192.168.1.1 → Invalid because the mask must be 0.0.0.0 for a default route.

D. [Huawei-Serial0] ip route-static 0.0.0.0 0.0.0.0 0.0.0.0 → Invalid interface syntax.

✅ Reference: HCIA-Datacom Routing Guide – Default Route Configuration

When HostA wants to send data to HostC, the following steps occur:

HostA checks if HostC is in the same subnet:

HostA and HostC are in different network segments, meaning HostA must send the packet to its default gateway (RTA, G0/0/0) to reach HostC.

HostA needs the MAC address of its gateway (RTA G0/0/0):

Since ARP (Address Resolution Protocol) is used to resolve IP to MAC addresses, HostA will send an ARP Request to obtain the MAC address of G0/0/0 of RTA.

RTA forwards the packet to HostC:

Once HostA sends the packet to RTA (using G0/0/0's MAC), RTA will route it to the correct network segment and send it to HostC through G0/0/1.

Why the Other Options Are Incorrect:

Option A (HostC) - Incorrect:

HostA does not send an ARP request for HostC because HostC is in a different subnet.

Option B (G0/0/1 of RTA) - Incorrect:

HostA only communicates with its directly connected gateway (G0/0/0), not G0/0/1.

Option C (SWA) - Incorrect:

Switches (SWA, SWB) operate at Layer 2 and do not require ARP.

Final Answer: D (G0/0/0 of RTA)

Huawei devices support different authentication modes:

authentication-mode local: Requires a username and password stored locally.

authentication-mode hwtacacs: Uses Huawei TACACS+ authentication, which requires a username and password.

authorization-mode hwtacacs: Refers to authorization (not authentication).

authentication-mode none: Does not require a username or password, meaning no authentication is needed.

Thus, the correct answer is D.

Detailed Explanation:An MPLS (Multiprotocol Label Switching) header includes the following fields:

Label: Identifies the MPLS path.

TTL (Time to Live): Limits the lifetime of the MPLS packet.

EXP (Experimental): Used for QoS marking. The Tos (Type of Service) field is part of the IP header, not MPLS.

(Reference: HCIA-Datacom Training Material, MPLS Header Fields)

Detailed Explanation:Static MAC address entries are manually configured and stored in the switch's configuration file, making them persistent across reboots. These entries remain in the MAC address table after a restart, unlike dynamic entries, which are lost. (Reference: HCIA-Datacom Training Material, MAC Address Table Types)

Router Initialization:

When a router boots up, it attempts to load its configuration file from the default save directory to initialize.

If the configuration file is missing, the router defaults to preconfigured parameters to ensure basic functionality.

Default Parameters:

These parameters include IP routing, interface defaults, and system-level settings. They allow network administrators to connect and manually configure the router.

Why Other Options Are Incorrect:

B: The "initial configuration file" refers to the manually created file, which may not exist.

C: The "current configuration file" is used during runtime but does not persist through reboots if unsaved.

D: A "new configuration file" must be manually created and does not exist by default.

References: HCIA-Datacom V1.0 Certification Guide, Chapter 2: Device Initialization.

Detailed Explanation:The EUI-64 format splits a MAC address into two parts and inserts "FFFE" in the middle. The Universal/Local (U/L) bit is flipped, so a valid EUI-64 address would be 02E0-FCEF-FFFE-0FEC​.