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| Section | Objectives |
|---|---|
| Topic 1: WLAN Basics | - Wireless networking fundamentals |
| Topic 2: Routing Technologies | - Static routing - Dynamic routing fundamentals (OSPF basics) |
| Topic 3: Network Security Basics | - Access control lists (ACL) - Basic network security concepts |
| Topic 4: IP Services | - DHCP and DNS concepts - NAT basics |
| Topic 5: Switching Technologies | - VLAN configuration and trunking - STP/RSTP concepts |
| Topic 6: Network Fundamentals | - Basic network topologies and devices - OSI and TCP/IP models |
| Topic 7: IP Addressing and Subnetting | - IPv4 addressing and subnet masks - IPv6 fundamentals |
| Topic 8: Network Management and Troubleshooting | - Basic troubleshooting tools and methods - Device management concepts |
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NEW QUESTION # 27
Which of the following is not a type of OSPF packets?
Answer: C
Explanation:
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.
NEW QUESTION # 28
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: A
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 # 29
When a Huawei device functions as an SSH client to log in to another network device for the first time, the ssh client first-time enable command must be run to enable the first-time login function of the SSH client. Otherwise, the login fails.
Answer: B
Explanation:
The SSH client first-time authentication behavior on Huawei devices is not dependent on a mandatory "ssh client first-time enable" command. The SSH client can initiate first-time login by handling host key verification interactively or through default trust behavior depending on configuration, so login failure does not inherently occur without enabling this command.
NEW QUESTION # 30
Which of the following commands can be used to check OSPF routes in the global routing table?
Answer: A
Explanation:
To check OSPF-learned routes in the global IP routing table , the correct command is display ip routing- table protocol ospf , so option A is correct. This command filters the routing table and shows only the routes whose source protocol is OSPF. It is especially useful when verifying whether OSPF-learned routes have been successfully installed into the forwarding table after neighbor establishment and LSDB calculation.
Option B , display ospf peer, is used to check OSPF neighbor information and adjacency states, not the routing table. Option C , display ospf interface, shows OSPF-related parameters on interfaces such as timers, network type, and cost. Option D , display ospf routing, displays OSPF route information maintained by the OSPF process itself, but the question specifically asks about routes in the global routing table , which is the RIB used for actual forwarding decisions. HCIA-Datacom distinguishes between protocol-specific route information and the final routing table seen by the device. Understanding this distinction helps engineers verify whether a protocol has only learned topology information or has actually produced usable forwarding entries.
NEW QUESTION # 31
What is the main function of the DNS protocol?
Answer: D
Explanation:
DNS (Domain Name System) is responsible for translating human-readable domain names (like www.example.com) into IP addresses, enabling devices to locate services on a network.
NEW QUESTION # 32
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