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| Section | Objectives |
|---|---|
| Topic 1: Switching Technologies | - VLAN configuration and trunking - STP/RSTP concepts |
| Topic 2: Network Management and Troubleshooting | - Basic troubleshooting tools and methods - Device management concepts |
| Topic 3: IP Addressing and Subnetting | - IPv6 fundamentals - IPv4 addressing and subnet masks |
| Topic 4: Routing Technologies | - Dynamic routing fundamentals (OSPF basics) - Static routing |
| Topic 5: Network Fundamentals | - OSI and TCP/IP models - Basic network topologies and devices |
| Topic 6: Network Security Basics | - Basic network security concepts - Access control lists (ACL) |
| Topic 7: WLAN Basics | - Wireless networking fundamentals |
| Topic 8: IP Services | - DHCP and DNS concepts - NAT basics |
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NEW QUESTION # 82
If the neighbor relationship between R1 and R2 has reached the Full state in OSPF, which of the following statements are true? (Select all that apply)
Answer: B,C,D
Explanation:
When two OSPF routers reach the Full state, it means that adjacency establishment has been successfully completed and the routers have synchronized the necessary link-state information for that area. For this to happen, the two routers must have different router IDs, so option A is correct. They must also belong to the same OSPF area on the interfaces used to form the adjacency, making option B correct. Once adjacency reaches Full state, the routers have synchronized their link-state databases for that area, so option D is also correct.
NEW QUESTION # 83
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: B
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 # 84
R1 has the following configurations:
[R1] radius-server template 1
[R1-radius-1] radius-server authentication 10.1.6.6 1812
[R1-radius-1] radius-server accounting 10.1.6.6 1813
[R1-radius-1] radius-server shared-key cipher YsHsjx_202206139
[R1-radius-1] quit
[R1] aaa
[R1-aaa] authentication-scheme auth1
[R1-aaa-authen-auth1] authentication-mode radius
[R1-aaa-authen-auth1] quit
[R1-aaa] accounting-scheme acc1
[R1-aaa-accounting-acc1] accounting-mode radius
[R1-aaa-accounting-acc1] quit
[R1-aaa] domain huawei.com
[R1-aaa-domain-huawei.com] authentication-scheme auth1
[R1-aaa-domain-huawei.com] accounting-scheme acc1
[R1-aaa-domain-huawei.com] radius-server 1
[R1-aaa-domain-huawei.com] quit
[R1-aaa] quit
Which of the following statements is true?
Answer: B
Explanation:
Option D is correct. The AAA configuration binds the domain huawei.com to the authentication scheme auth1 , which uses RADIUS as the authentication mode, and to the accounting scheme acc1 , which also uses RADIUS. Therefore, when a user logs in with a user name in the format hcia-datacom@huawei.com , the device parses the suffix @huawei.com, matches the domain, and applies the configured RADIUS authentication method.
Option A is false because RADIUS does support accounting , and UDP port 1813 is commonly used for that purpose. Option B is false because a separate authorization server IP is not strictly required in this context; RADIUS can carry authorization attributes together with authentication/accounting processing depending on server behavior and device configuration. Option C is false because standard RADIUS communication uses UDP , not TCP, with authentication typically on port 1812 and accounting on 1813 . HCIA-Datacom teaches domain-based AAA processing as a key concept, where the user name suffix determines which authentication, authorization, and accounting policies are applied on the NAS device.
NEW QUESTION # 85
An enterprise has a small amount of wireless user traffic, and all user gateways are located on the core switch.
To ensure WLAN security, the customer wants to manage wireless user traffic uniformly on the WAC and requires that the WAC does not carry any wired user traffic. Which of the following WLAN networking methods can the customer choose?
Answer: B
Explanation:
The customer requires centralized processing of wireless traffic without forwarding ordinary wired traffic through the WAC.
According to the HCIA-Datacom WLAN architecture material, off-path networking allows the WAC to connect to the existing network without operating as an aggregation switch for wired user traffic.
Layer 3 off-path networking allows the WAC and Fit APs to communicate across different IP subnets.
Tunnel forwarding encapsulates wireless user traffic into CAPWAP data tunnels and sends it to the WAC for centralized forwarding and security policy enforcement.
Direct forwarding would allow wireless traffic to bypass the WAC, failing the requirement for centralized wireless traffic management.
In-path networking could place the WAC in the forwarding path of wired services, which is not desired.
Therefore, off-path Layer 3 networking with tunnel forwarding satisfies the stated requirements.
NEW QUESTION # 86
Both SNMP Trap and Inform Request are used by managed devices to send alarms to the NMS.
Inform Request requires an acknowledgment from the NMS, whereas Trap does not.
Answer: B
Explanation:
This statement is true. In SNMP, both Trap and Inform messages are used by managed devices to proactively report alarms or events to the Network Management System (NMS). However, their reliability behavior is different. A Trap is sent without requiring an acknowledgment from the NMS.
Once it is transmitted, the sender does not confirm whether the manager actually received it.
By contrast, an Inform Request requires the NMS to send a response confirming receipt. If the managed device does not receive the acknowledgment within the expected time, it can retransmit the Inform message. Because of this, Inform is considered more reliable than Trap, although it also introduces slightly more overhead. HCIA-Datacom highlights this difference when explaining SNMP-based monitoring and alarm reporting. In real network O&M scenarios, the choice between Trap and Inform depends on the required balance between reliability and simplicity. This question tests a very standard SNMP knowledge point: Trap is unacknowledged, while Inform is acknowledged. Understanding this distinction helps network engineers choose suitable alarm reporting mechanisms in enterprise monitoring platforms.
NEW QUESTION # 87
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