H12-821_V1.0 Exam Dumps - HCIP-Datacom-Core Technology V1.0

Comprehensive and Detailed In-Depth Explanation:

IPsec (IP Security Protocol) establishes Security Associations (SAs) for encrypted communication.

An SA is uniquely identified by a 3-tuple:

SPI (Security Parameter Index) → Identifies the SA.

Destination IP Address → Specifies the receiving device.

Security Protocol ID → Indicates whether AH (Authentication Header) or ESP (Encapsulating Security Payload) is used.

A. Key exchange protocol is not part of the SA 3-tuple. It is used during IKE (Internet Key Exchange) but is not part of the SA itself.

📖 Reference: Huawei HCIA-Datacom Study Guide, IPsec Security Association and SA Identification.

Multi-channel protocols such as H.323 and FTP use separate control and data channels. H.323 uses different channels for call signaling and media streaming, while FTP uses a control channel for commands and a data channel for file transfers. Telnet and SMTP are single-channel protocols ​.

Comprehensive and Detailed In-Depth Explanation:

Intermediate System to Intermediate System (IS-IS) routers send IS-to-IS Hello (IIH) packets to establish neighbor relationships.

The Reserved/Circuit Type field in IIH packets indicates which level of IS-IS adjacency the router is trying to establish:

00 → Level-0 (Not used in IS-IS).

01 → Level-1 router.

10 → Level-2 router.

11 → Level-1-2 router (Both levels supported).

Since the question asks for the field value in an L1-L2 router’s IIH packets, the correct answer is 11 (B).

📖 Reference: Huawei HCIA-Datacom Study Guide, IS-IS Neighbor Discovery and IIH Packet Format.

Wi-Fi 6 corresponds to the IEEE 802.11ax standard. It offers improved efficiency, higher data rates, and better performance in dense environments compared to its predecessors like 802.11ac (Wi-Fi 5) and 802.11n (Wi-Fi 4) ​.

Comprehensive and Detailed In-Depth Explanation:

A. TRUE → Firewalls maintain session tables with a default session timeout; adjusting it depends on network conditions.

B. FALSE → Fast session aging does not affect persistent connection sessions. Persistent connections (e.g., TCP keepalives) maintain sessions even if aging settings change.

C. TRUE → Sessions must be constantly matched with ongoing traffic to remain active.

D. TRUE → Even without stateful inspection, the firewall creates session entries for non-first packets to maintain continuity of services.

📖 Reference: Huawei HCIA-Datacom Study Guide, Firewall Session Table Mechanism.

When OSPF routers have interfaces on different network segments with different subnet masks, the network type can be adjusted to establish adjacency. A point-to-point (P2P) network type eliminates the requirement for matching subnet masks by treating the link as directly connected without intermediate devices.

P2P Network Characteristics

OSPF treats the link as a direct connection between two routers.

No DR/BDR election occurs, simplifying adjacency establishment.

Subnet mask differences do not hinder neighbor relationships as the link is viewed as a logical tunnel.

HCIP-Datacom-Core Reference

The OSPF configuration section explicitly mentions P2P as a suitable network type for resolving adjacency issues caused by mismatched subnet masks​​.

In a route-policy, attributes such as MED (Multi-Exit Discriminator) and Local-Preference can be used in apply clauses to influence BGP route selection. Attributes like AS_Path and Tag are typically matched or filtered but not directly applied in the apply clause ​.

Comprehensive and Detailed Step-by-Step Explanation:

1. Understanding Hybrid Interfaces on a Layer 2 Switch:

Layer 2 switches support different interface types, such as access, trunk, and hybrid interfaces.

A trunk interface allows traffic from multiple VLANs to pass through, but frames belonging to the native VLAN are sent untagged, while all other VLAN frames are tagged.

A hybrid interface is more flexible:

It allows traffic from multiple VLANs to pass through, just like a trunk interface.

However, you can configure whether frames for specific VLANs are tagged or untagged as they leave the interface. This feature is useful in certain networking scenarios, such as connecting devices that do not support VLAN tagging.

2. Key Differences Between Trunk and Hybrid Interfaces:

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3. Why the Statement is TRUE:

The statement accurately describes the functionality of a hybrid interface:

It supports traffic from multiple VLANs.

It allows administrators to configure whether outgoing frames are tagged or untagged for specific VLANs.

4. Summary:

The statement is TRUE because hybrid interfaces on a Layer 2 switch support traffic from multiple VLANs and allow flexible tagging configurations.