Huawei HCIA-Datacom V1.0 H12-811_V1.0 Exam Practice Test

Answer : B

In a Spanning Tree Protocol (STP) environment, the root bridge is selected based on the bridge ID. Here, SWA has the lowest bridge ID (4096:0001-0203-04AA), making it the root bridge. For each network segment, STP elects one designated port to forward traffic, and all other ports in that segment will be blocked to prevent loops.

Following the STP rules:

SWA is the root bridge, so all of its ports (G0/0/2 and G0/0/3) will be designated ports.

Each non-root switch (SWB and SWC) selects one root port, which is the port with the lowest path cost to the root bridge (SWA).

SWB's G0/0/3 will have a higher path cost when compared with G0/0/1 (if assuming equal link costs), thus making G0/0/1 the root port on SWB.

SWB will then block its G0/0/3 port to prevent a loop, as SWA's G0/0/3 is already the designated port for that link.

Hence, G0/0/3 of SWB will be in the blocking state to maintain a loop-free topology

Answer : A, C, D

In the provided routing table, the router's next hop for each destination indicates whether the destination is reachable directly or indirectly. For entries where the next hop is specified, the router forwards packets accordingly through the designated interface, as confirmed in the table output. This information is used to verify the forwarding behavior for each destination.

Answer : C

TPID (Tag Protocol Identifier) is a field in the VLAN tag that identifies 802.1Q-tagged frames.

The correct TPID value for 802.1Q is 0x8100.

0x9100 (B) is used for Q-in-Q (double tagging).

0x7200 (A) and 0x8200 (D) are incorrect values.

Thus, the correct answer is C (0x8100).

Answer : A, B

Main Functions of Routers:

Routers primarily operate at the Network Layer (Layer 3) of the OSI model, forwarding data packets based on destination IP addresses and maintaining routing tables for decision-making.

Analysis of Options:

Option A: 'Routers forward data packets based on source IP addresses' is incorrect, as routers use the destination IP address in a packet to determine its forwarding path, not the source IP address.

Option B: 'Routers enable devices on the same network segment to communicate with each other' is not a function of routers. Devices on the same segment communicate using switches or hubs, which operate at the Data Link Layer (Layer 2).

Option C: 'Routers forward data packets according to routing tables' is a correct function, as routers rely on routing tables to determine the best path for forwarding packets.

Option D: 'Routers learn routes through multiple routing protocols and add them to the routing table' is a correct function of routers in dynamic routing scenarios.

Correct Answer:

The functions A and B are not main functions of routers.

Answer : B

Eth-Trunk Functionality:

An Eth-Trunk interface can operate as both a Layer 2 and Layer 3 interface depending on the configuration. For example:

As a Layer 2 interface, it can aggregate Ethernet links for switching.

As a Layer 3 interface, it can aggregate links for routing.

Correct Answer:

FALSE. Eth-Trunk interfaces can function as both Layer 2 and Layer 3 interfaces.

Answer : B

SNMPv1 uses Trap messages to send unsolicited notifications about network events (e.g., failures, threshold breaches).

Response (A): Sent as a reply to SNMP queries, not proactively.

Get-Next Request (C) and Get-Request (D): These are polling requests, not proactive alarms.

Thus, the correct answer is B (Trap).

Answer : B

Comprehensive Explanation= WEP (Wired Equivalent Privacy) is the only security policy in this list that supports open link authentication, which means no actual user credentials are required to associate with the network. WEP uses a shared key for encryption but offers minimal protection and is considered insecure. Other security methods like WPA, WPA2-PSK, and WPA2-802.1X use more secure forms of authentication, requiring credentials such as a password or centralized authentication server.