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

Given correct configuration, hosts within the same subnet should be able to communicate, so the host at 10.0.12.1 can ping the host at 10.0.12.2. This scenario assumes correct interconnectivity and absence of firewall or ACL rules that would block the communication​.

How Routers Handle Packets:

Routers do not change the destination IP address when forwarding packets.

The destination IP remains the same to ensure the packet reaches the intended recipient.

Router’s Role:

Routers inspect the destination IP, determine the best path using routing tables, and forward the packet accordingly.

Conclusion:

The destination IP address remains unchanged; hence, the statement is FALSE.

References: HCIA-Datacom V1.0 Certification Guide, Chapter 2: IP Forwarding.

Comprehensive Explanation: Router Advertisement (RA) packets in IPv6 are part of the Neighbor Discovery Protocol, which uses ICMPv6 (Internet Control Message Protocol for IPv6). RA messages are sent by routers to inform hosts about the presence of routers on the network and provide them with information needed for stateless address auto-configuration, such as the network prefix and default gateway.

Detailed Explanation:Making a call on a landline telephone involves network communication. Though it uses a traditional telephone network (Public Switched Telephone Network, PSTN), the process of sending and receiving voice data through a wired system qualifies as network communication. The voice signals are converted into electrical signals, transmitted over the network, and then converted back into voice signals on the receiving end .

IP Address Uniqueness on VLANIF Interfaces:Each VLANIF interface represents a different logical interface, often tied to distinct subnets. IP addresses for VLANIF interfaces must be unique on the same switch to prevent address conflicts and routing issues​​.

Correct Answer:TRUE. The IP addresses of VLANIF interfaces on the same switch must be different.

Comprehensive Explanation: It is possible for the load balancing modes at both ends of an Eth-Trunk (Ethernet Trunk) to be different, as long as the devices at both ends support the different modes. Load balancing modes control how traffic is distributed across multiple links in the trunk. Although the modes may differ, they must be compatible in terms of ensuring that traffic is appropriately handled across the multiple physical interfaces bundled in the trunk.

A (Correct) - Load Balancing: Link aggregation distributes traffic across multiple physical links, reducing congestion and improving performance.

B (Correct) - Improved Bandwidth: Multiple links act as a single logical link, increasing the total available bandwidth.

C (Correct) - Enhanced Reliability: If one link in an aggregated group fails, traffic is rerouted through the remaining links, improving network resilience.

D (Incorrect) - Improved Security: Link aggregation does not inherently improve security; it primarily enhances performance and fault tolerance.

Thus, the correct answers are A, B, and C.

Detailed Explanation:

• Option A: Incorrect. UDP (User Datagram Protocol) does not use SYN or ACK flags, as it is a connectionless protocol and does not establish a connection before data transfer. SYN and ACK flags are features of TCP (Transmission Control Protocol), which establishes connections using a three-way handshake. (Reference: HCIA-Datacom Training Material, Transport Layer Protocols)

• Option B: Incorrect. UDP is suitable for delay-sensitive traffic (such as video or voice) because of its low overhead. However, UDP does not have a sequence number field or support reassembly, as it does not guarantee packet order or reliability. (Reference: HCIA-Datacom Training Material, UDP Characteristics)

• Option C: Correct. TCP requires a three-way handshake to establish a connection and a four-way handshake to terminate it, involving SYN, ACK, FIN flags for reliability. (Reference: HCIA-Datacom Training Material, TCP Connection Establishment and Termination)

• Option D: Correct. The well-known port number range is defined as 0 to 1023, and these are reserved for widely used protocols such as HTTP, FTP, and DNS. (Reference: HCIA-Datacom Training Material, Port Numbering)

Comprehensive Explanation: A routing table contains several key elements:

Cost: Also known as metric, this indicates the cost associated with reaching a specific destination, such as the number of hops or link speed.

Next-hop address: This is the IP address of the next device along the route that packets should be forwarded to.

Protocol: The routing protocol (e.g., OSPF, RIP) that determined the route.

Interface: The physical or logical interface through which the router sends packets to reach the destination.

Destination/Mask: The destination network or subnet and the associated subnet mask define the range of IP addresses for which this route is valid. These elements together allow routers to efficiently forward traffic to the correct destinations.