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Huawei HCIP-Datacom-Core Technology V1.0 Sample Questions (Q198-Q203):

NEW QUESTION # 198
In BGP, the Origin attribute is used to identify the origin of a route. Which of the following statements are true about the Origin attribute?

A. If a route is learned through EGP, the Origin attribute of this BGP route is displayed as ? in the BGP routing table.
B. This attribute is a well-known mandatory attribute.
C. If a route is imported to BGP by the originator using the network command, the Origin attribute of the BGP route is displayed as i in the BGP routing table.
D. If multiple routes carry the same destination address but different Origin attributes and all other route selection conditions are the same, BGP selects the optimal route according to the Origin attribute in the following order: IGP > EGP > Incomplete.

Answer: B,C,D

Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
* Definition of the Origin Attribute:
* The Origin attribute is a well-known mandatory attribute used to indicate the source of a route. It has three possible values:
* i (IGP): The route was injected into BGP using the network command.
* e (EGP): The route was learned from an EGP protocol (not commonly used now).
* ? (Incomplete): The route was redistributed into BGP from another routing protocol.
* Analysis of Each Option:
* Option A: Correct. When the network command is used, the Origin is set to i (IGP).
* Option B: Incorrect. Routes learned from EGP have the Origin attribute set to e (EGP), not ?
(Incomplete).
* Option C: Correct. BGP prefers routes with the Origin attribute in the order: IGP > EGP > Incomplete.
* Option D: Correct. The Origin attribute is a well-known mandatory attribute.
References:
* HCIA-Datacom Study Guide, Chapter: BGP Attributes
* Huawei BGP Attribute Comparison

NEW QUESTION # 199
IGMPv2 uses the timeout mechanism for group members leaving a group. Group members can only leave a group silently. Before the timeout period expires, multicast traffic is still forwarded by the multicast router, and this is a defect.

A. FALSE
B. TRUE

Answer: A

Explanation:
This statement isfalsebecauseIGMPv2 improves upon IGMPv1 by introducing the Leave Group message.
InIGMPv1, members leave silently, and the router waits for the timeout.
InIGMPv2, a host sends aLeave Groupmessage, prompting the router to send aGroup-Specific Queryto determine if other members are still present. If no responses are received, the group is pruned before timeout.
Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
"IGMPv2 allows group members to actively send Leave messages, reducing unnecessary forwarding delays.
This improves efficiency over IGMPv1."
(Chapter: Multicast Protocols - Section: IGMP Versions)

NEW QUESTION # 200
Which of the following TLVs is used by ISIS to describe the IP address of an interface?

A. 0
B. 1
C. 2
D. 3

Answer: C

Explanation:
In the IS-IS protocol, TLV 129 (IPv4 interface address) is used to describe the IP address of an interface.
Each TLV type carries specific information, and TLV 129 specifically relates to interface IP addresses .

NEW QUESTION # 201
A network entity title consists of an area address and a system ID. It is a special NSAP (the SEL has a fixed value of 00) and is mainly used for route calculation.

A. FALSE
B. TRUE

Answer: B

Explanation:
Comprehensive and Detailed in-depth Step-by-Step Explanation:
TheNetwork Entity Title (NET)is a unique identifier assigned to an IS-IS router. It is derived from theNetwork Service Access Point (NSAP)address and consists of the following components:
Area Address:
Identifies the area in which the router resides.
Multiple routers in the same IS-IS area must have the same area address.
System ID:
Uniquely identifies the router within the IS-IS area.
The System ID is typically derived from the router's loopback IP address or another unique value.
SEL (Selector Field):
The SEL field is always set to00for IS-IS NETs.
The NET is used by IS-IS for route calculation and to identify the router within the IS-IS domain. Therefore, the statement isTRUE.
References:
Huawei HCIA-Datacom Study Guide, Chapter on "IS-IS Addressing".
RFC 1195 - Use of OSI IS-IS for Routing in TCP/IP and Dual Environments.

NEW QUESTION # 202
On a P2P IS-IS network, after a neighbor relationship is established between R1 and R2, R2 finds that its LSDB is not synchronized. Then, R2 requests corresponding LSPs from R1 for LSDB synchronization. The following figure shows the synchronization process. Drag the following packet types to the steps in which they are used.(Token is reusable)

Answer:

Explanation:

Explanation:
A screenshot of a computer Description automatically generated

Explanation of IS-IS Packet Types and Synchronization Process:
In the given scenario, R2 requests LSPs from R1 to synchronize its Link State Database (LSDB). The following IS-IS packet types are involved in this synchronization process:
1. P2P IIH (Point-to-Point IS-IS Hello):
* Purpose: Establishes and maintains IS-IS neighbor relationships.
* Step: This packet is exchanged initially to detect and maintain the adjacency between R1 and R2.
2. PSNP (Partial Sequence Number PDU):
* Purpose: Requests missing or outdated LSPs (Link State PDUs) from a neighbor to synchronize the LSDB.
* Step: In this case, R2 sends a PSNP to R1 to request the missing or outdated LSP.
3. LSP (Link State PDU):
* Purpose: Contains routing information and is used to update the LSDB.
* Step: R1 sends the requested LSPs to R2 for synchronization.
4. CSNP (Complete Sequence Number PDU):
* Purpose: Lists all LSPs in the sender's LSDB to help neighbors verify and request missing LSPs.
* Step: R1 sends a CSNP during retransmission timeout to notify R2 of its LSPs.

NEW QUESTION # 203
......

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