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NEW QUESTION # 92
Which of the following commands can be used to enable OSPF on the loopback interface (10.0.1.1/32) of R1?
(Select all that apply)
Answer: A,B,C,D
Explanation:
In Huawei OSPF configuration, the network command identifies interfaces whose IP addresses match the specified network address and wildcard mask.
A wildcard mask uses zero bits to indicate positions that must match exactly and one bits to indicate positions that can vary.
Option A matches only the specific address 10.0.1.1.
Option B matches all addresses within 10.0.1.0/24, including 10.0.1.1.
Option C matches the larger 10.0.0.0/16 range, which also includes the loopback address.
Option D uses a wildcard mask of 255.255.255.255, meaning that all IPv4 address bits are ignored during matching. Consequently, every eligible IPv4 interface address matches.
All four commands therefore match the loopback interface address and can enable OSPF on that interface when configured in the appropriate OSPF area.
The correct answers are A, B, C, and D.
NEW QUESTION # 93
The IPv6 header is also called a fixed header, which contains eight fields. The total length of the fixed header is 40 bytes. Which of the following fields does an IPv6 header include?
Answer: A,B,C
Explanation:
The IPv6 basic header has a fixed length of 40 bytes and contains eight fields: Version, Traffic Class, Flow Label, Payload Length, Next Header, Hop Limit, Source Address, and Destination Address. The Source IPv6 Address is therefore part of the IPv6 header. Hop Limit is also present and serves a function comparable to the IPv4 TTL field by limiting how many Layer 3 forwarding hops a packet can traverse. Next Header identifies the type of extension header or upper-layer protocol that follows the IPv6 basic header. A source MAC address is not part of the IPv6 header. MAC addresses belong to the data-link-layer frame header, such as an Ethernet header, and are relevant only to the current Layer 2 segment. As an IPv6 packet is routed, Ethernet source and destination MAC addresses can change from hop to hop while the IPv6 source and destination addresses normally remain unchanged end to end. Therefore A, B, and C are IPv6 header fields, while D is not. The correct answer is A, B, and C.
NEW QUESTION # 94
In the figure, a TCP connection has been established between PC1 and PC2. After PC1 sends a data segment to PC2, which of the following is the acknowledgment number in the packet returned by PC2?
Answer: C
Explanation:
In TCP, the acknowledgment number indicates the next byte that the receiver expects to receive. In the figure, PC1 sends a TCP segment to PC2 with sequence number = a+22 and payload length = 22 bytes. Since TCP sequence numbers count bytes, the last byte carried in this segment corresponds to sequence number a+43.
Therefore, after PC2 successfully receives this data, it sends back an ACK indicating that the next expected byte is a+44.
That is why option B is correct. This is a standard TCP reliability mechanism. TCP does not acknowledge
"packets" as units; it acknowledges the byte stream. The ACK number always points to the next byte expected from the peer. The source and destination port numbers identify the session, but the sequence and acknowledgment numbers track ordered delivery. HCIA-Datacom uses this mechanism to explain connection- oriented transport, reliable delivery, retransmission, and traffic control. Understanding how the payload length affects sequence progression is essential when analyzing packet captures and troubleshooting TCP communication problems in enterprise networks.
NEW QUESTION # 95
Drag and Drop Question
R1 has the following configurations:
[R1] acl number 3000
[R1-acl4-advance-3000] rule 5 permit ip source 10.0.1.0 0.0.0.1
[R1-acl4-advance-3000] rule 10 deny ip source 0.0.1.0 15.0.0.3
[R1-acl4-advance-3000] rule 15 deny ip source 10.2.1.1 0
[R1-acl4-advance-3000] rule 20 permit ip
[R1-acl4-advance-3000] quit
Match the following source IP addresses of packets with the corresponding rule IDs.
Answer:
Explanation:
Explanation:
10.0.1.1 โ rule 5
192.168.2.1 โ rule 10
12.0.1.3 โ rule 20
10.2.1.1 โ rule 15
ACL rules are matched in order from top to bottom. Rule 5 matches only the specific pattern derived from 10.0.1.0 with a small wildcard variation, so it applies to 10.0.1.1. Rule 15 is an exact match for 10.2.1.1. Rule 10 does not match any of the given source addresses based on its wildcard constraint, so those packets fall through to the final permit rule. Rule 20 therefore handles all remaining unmatched traffic.
NEW QUESTION # 96
During VLAN planning for a campus network, VLAN IDs for different service types must be allocated consecutively, without redundancy, to prevent omissions in future allocations.
Answer: A
Explanation:
This statement is false . In campus network VLAN planning, VLAN IDs do not have to be allocated strictly consecutively without any gaps. In fact, leaving some reserved VLAN IDs is often a practical and recommended design approach. VLAN planning should focus on clarity, scalability, maintainability, and service separation , rather than on forcing all VLAN IDs to be contiguous.
For example, an administrator may reserve certain VLAN ranges for user access, voice services, management, wireless services, guest access, future expansion, or specific departments. Such structured planning makes later network expansion easier and reduces the risk of service conflicts or disruptive renumbering. HCIA- Datacom emphasizes that good campus network planning should consider current requirements and future growth. Consecutive allocation may look tidy at first, but it can actually reduce flexibility and make later additions more difficult. Therefore, the idea that VLAN IDs must be assigned consecutively without redundancy to avoid omissions is not a correct design principle. Reasonable reservation and categorized allocation are often more beneficial in real enterprise campus networks.
NEW QUESTION # 97
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