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NEW QUESTION # 155
IGMP group entries play an important role in multicast forwarding. An administrator runs a command to view information about a multicast entry. The information is as follows:
sql
Copy
<HUAWEI> display igmp group
Interface group report information
Vlanif100(10.1.6.2):
Total 1 IGMP Group reported
Group Address Last Reporter Uptime Expires
225.1.1.2 10.1.6.10 00:02:04 00:01:17
Given this, which of the following statements are true?
Answer: A,B,D
Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
1. Understanding the IGMP Group Entry:
The IGMP group entry contains key information about multicast groups on the interface:
Group Address (225.1.1.2):The multicast group address that the user has joined.
Last Reporter (10.1.6.10):The IP address of the last host that sent an IGMP Report message for this group.
Uptime:The duration since the group was first reported.
Expires:The remaining time before the group entry ages out if no further reports are received.
2. Analysis of Each Statement:
Option A: This entry can be used to construct the corresponding (S, G) entry.
Incorrect.
This is a group entry for IGMP, which contains information about the group (G) but does not include a specific source (S). (S, G) entries are created in PIM (Protocol Independent Multicast), not IGMP.
Option B: This entry is created when the device receives an IGMP Join message from a user.
Correct.
IGMP Join messages are used by hosts to signal their intent to join a multicast group. When such a message is received, the group entry is created.
Option C: Expires indicates the aging time of the IGMP group.
Correct.
The "Expires" field shows the remaining time before the group entry ages out if no further IGMP reports are received.
Option D: 225.1.1.2 is the address of the group that the user joins.
Correct.
The "Group Address" field explicitly states that 225.1.1.2 is the multicast group that the user has joined.
3. Summary:
Correct Options:B, C, D
Reference:
Huawei HCIA-Datacom Study Guide, Chapter "IGMP Group Entries."
NEW QUESTION # 156
Which of the following descriptions about the linkage between VRRP and interface status to monitor the uplink interface is wrong? (Multiple choice)
Answer: B,D
NEW QUESTION # 157
The following is a partial configuration of a router.
The correct description of this configuration is:
Answer: B
NEW QUESTION # 158
In the network as shown in the figure, which of the following descriptions about R4 preferred routing is correct?
Answer: C
NEW QUESTION # 159
An enterprise network runs OSPF to implement network communication. Which of the following types of LSAs may be generated by an ABR?
Answer: B,C,D
Explanation:
Comprehensive and Detailed in-depth Step-by-Step Explanation:An Area Border Router (ABR) is an OSPF router that connects multiple areas, including the backbone area (Area 0). It plays a critical role in summarizing and propagating routing information between areas. The types of LSAs that an ABR can generate include:
* Network Summary LSA (Type 3):
* ABRs generate Type 3 LSAs to summarize and propagate routes from one area into another.
* For example, an ABR generates a Type 3 LSA to inform other areas about the networks in the area it is connected to.
* ASBR Summary LSA (Type 4):
* If an ASBR exists in one of the OSPF areas connected to the ABR, the ABR generates Type 4 LSAs.
* These LSAs provide information about how to reach the ASBR.
* NSSA LSA (Type 7):
* If the ABR is connected to a Not-So-Stubby Area (NSSA), it can generate Type 7 LSAs.
* These LSAs are used to describe external routes imported into the NSSA.
* AS External LSA (Type 5):
* These LSAs are not typically generated by an ABR unless the ABR is also functioning as an ASBR. Type 5 LSAs are used to describe external routes imported into OSPF from other autonomous systems.
Therefore, NSSA LSA (A), Network Summary LSA (C), and ASBR Summary LSA (D) are valid answers.
AS External LSA (B) would only be correct if the ABR were also functioning as an ASBR, but that is not explicitly stated in the question.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "OSPF LSAs and ABR Functions".
* RFC 2328 - OSPF Version 2.
NEW QUESTION # 160
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