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>> Valid H12-811_V2.0 Exam Objectives <<
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NEW QUESTION # 72
Four links between two switches establish an Eth-Trunk in manual mode, and the bandwidth of each link is 1 Gbit/s. One of the links fails. Which of the following statements are true about this scenario? (Select all that apply)
Answer: B,C
Explanation:
In an Eth-Trunk working in manual mode , multiple physical member links are bundled into one logical interface to provide higher bandwidth and link redundancy. If one of four 1 Gbit/s member links fails, the Eth- Trunk does not go down as long as at least one valid member link remains active. Therefore, statement A is correct. Since one link has failed and three member links remain available, the total available bandwidth becomes 3 Gbit/s , so statement B is also correct.
Statement C is incorrect because the traffic originally hashed to the failed link is not permanently stopped.
Instead, after the link failure is detected, traffic is redistributed across the remaining active member links according to the trunk load-balancing mechanism. Statement D is also incorrect because Eth-Trunk provides link-level redundancy. Existing upper-layer sessions such as TCP are not necessarily interrupted and re- established simply because one member link fails. HCIA-Datacom emphasizes that Eth-Trunk improves reliability and bandwidth utilization by allowing traffic to continue across surviving links when a single member fails. This is one of the main advantages of link aggregation in campus and data center switching networks.
NEW QUESTION # 73
On an intelligent computing data center network, network administrators deploy various intelligent lossless network technologies such as PFC to implement a high-speed and low-latency lossless network. Which of the following statements are false about the working principles of PFC?
(Choose all that apply.)
Answer: A,C
Explanation:
PFC (Priority Flow Control) is triggered before buffer overflow, based on predefined thresholds, not only when the buffer is fully cleared. The receiver sends PFC pause frames when congestion is detected or thresholds are exceeded to pause specific traffic priorities. It resumes transmission by sending a PFC resume (stop pause) frame once congestion is relieved to a safe threshold level, not after the buffer is completely emptied.
NEW QUESTION # 74
Assume that PC1 and PC2 can communicate with each other. When R1 forwards a data packet sent from PC1 to PC2, which of the following statements are true?
Answer: A,B
Explanation:
This question tests the difference between Layer 3 addressing and Layer 2 encapsulation during routing. The IP packet originated by PC1 keeps PC1 ' s IP address as its source IP and PC2 ' s IP address as its destination IP as it traverses the routers. Ethernet MAC addresses, however, are rewritten at every routed hop. When R1 forwards the packet across the link toward R2, R1 builds a new Ethernet frame on its outgoing interface.
According to the exhibit, R1 ' s outgoing interface on the R1-R2 link uses MAC_C, so MAC_C is the source MAC address. The next-hop device on that link is R2, whose receiving interface uses MAC_D, so MAC_D is the destination MAC address. MAC_A belongs to PC1 and was relevant only on the first local Ethernet segment. MAC_F belongs to PC2 and is used on the final Ethernet segment from R2 to PC2, not on the R1- R2 link. Therefore the correct statements are B and D. The uploaded key B, C is incorrect.
NEW QUESTION # 75
The administrator configures an Eth-Trunk in LACP mode between two switches, and sets the maximum number of active links in the Eth-Trunk to 3 and the number of remaining standby links to 1. If one of the active links fails, the two switches automatically adjust the number of active links to 2 through negotiation, and the standby link remains in the standby state.
Answer: A
Explanation:
This statement is false . In an Eth-Trunk operating in LACP mode , if the administrator sets the maximum number of active links to 3 and there is 1 standby link, then when one active member fails, LACP can automatically promote the standby member to active status. The purpose of the standby member is to maintain the configured active-link capacity whenever possible.
Therefore, after one active link fails, the normal expectation is not that the active-link count is reduced from 3 to 2 while the standby link remains idle. Instead, the standby link should participate and replace the failed member, so that the Eth-Trunk continues operating with 3 active links if the standby link and negotiation conditions are normal. This reflects the redundancy and fast recovery capabilities of LACP-based aggregation. HCIA-Datacom highlights that compared with manual mode, LACP provides more intelligent link selection, active/standby management, and fault adaptation. The statement is wrong because it ignores the intended behavior of the standby link in maintaining the number of active forwarding links after a failure.
NEW QUESTION # 76
An administrator attempts to add the following rule to ACL 2001 on R1:
[R1] acl 2001
[R1-acl4-basic-2001] rule deny tcp destination-port eq telnet source 192.168.1.3 0 destination 192.168.2.0
0.0.0.255
In this case, the rule cannot be configured successfully.
Answer: B
Explanation:
ACL 2001 is a basic IPv4 ACL because Huawei numbered basic ACLs use the range 2000 to 2999. A basic ACL can match relatively simple conditions such as source IP address and an effective time range, but it does not support matching the IP protocol, destination IP address, or TCP/UDP source and destination port numbers. The attempted rule includes tcp, destination-port eq telnet, and a destination network, all of which require an advanced ACL. Huawei advanced ACLs use the 3000 to 3999 range and can match protocol type, source and destination addresses, and Layer 4 port values. Therefore, even after correcting the obvious command typo from ad 2001 to acl 2001, the rule syntax is still incompatible with a basic ACL 2001 and cannot be successfully configured in that ACL view. To implement the intended policy, the administrator should create an advanced ACL and express the TCP Telnet and destination conditions there. Consequently, the statement that the rule cannot be configured successfully is TRUE, option A.
NEW QUESTION # 77
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