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NEW QUESTION # 17
Radio waves are a type of electromagnetic waves with relatively high frequencies and short wavelengths in the electromagnetic spectrum.
Answer: B
Explanation:
Radio waves are part of the electromagnetic spectrum and are characterized by relatively low frequency and long wavelength compared to other types such as microwaves, infrared, and visible light. However, they still belong to the broader category of electromagnetic waves, so the statement correctly identifies them as electromagnetic waves, making it true.
NEW QUESTION # 18
On the switched network shown in the figure, STP is enabled on all devices. SW1 is the root bridge. The port costs are shown in the figure. Other parameters retain the default values. After the network is stable, which of the following RPC values is calculated by SW3 for the path to SW1?
Answer: D
Explanation:
SW1 is the root bridge, so its cost is 0. SW3 calculates its Root Path Cost by selecting the lowest- cost path toward SW1.
There are two possible paths from SW3 to SW1:
Direct path SW3 → SW1: SW3 uses its port cost of 100 on the link to SW1, so RPC = 100.
Indirect path SW3 → SW2 → SW1: SW3 to SW2 has a cost of 40, and SW2 to SW1 has a cost of
50, so total cost = 40 + 50 = 90.
The lowest value is 90, so SW3's RPC is 90.
NEW QUESTION # 19
The emergence of AI poses new requirements on data center networks. To meet AI computing requirements, a high-speed intelligent computing data center network with zero packet loss needs to be constructed. Which of the following statements are false about the requirements and solutions of intelligent computing data center networks? (Select all that apply)
Answer: B,D
Explanation:
The false statements are A and D . Option A is considered false in HCIA-Datacom wording because intelligent computing data center networks aim to build a lossless Ethernet fabric through coordinated technologies such as high-bandwidth interfaces, deep buffers, PFC, ECN, congestion control, and optimized forwarding. The exam-oriented knowledge point treats these technologies as solutions for a zero packet loss network design goal rather than stating that a truly lossless network cannot be achieved.
Option D is also false because RDMA is used to reduce end-to-end communication latency and CPU overhead between servers, especially for east-west traffic in AI and high-performance computing clusters. It is not specifically described as reducing latency between GPU servers and physical switches . That wording is inaccurate. Option B is true because PFC and ECN are standard lossless Ethernet technologies applied in intelligent computing networks. Option C is also true because AI training and distributed computing generate massive data synchronization traffic, requiring very high single-port bandwidth such as 200GE or 400GE .
HCIA-Datacom highlights bandwidth, low latency, and lossless transport as the core requirements of intelligent computing data center networks.
NEW QUESTION # 20
Which of the following hosts are reachable to the host at 192.168.1.200/27 at Layer 2? (Select all that apply)
Answer: A,B,C
Explanation:
A /27 subnet mask is 255.255.255.224, which means each subnet contains 32 IP addresses. The subnet increments in blocks of 32 in the last octet: 0, 32, 64, 96, 128, 160, 192, 224. The address
192.168.1.200/27 belongs to the subnet 192.168.1.192/27.
For this subnet, the network address is 192.168.1.192, the broadcast address is 192.168.1.223, and the valid host range is from 192.168.1.193 to 192.168.1.222. Therefore, 192.168.1.221/27,
192.168.1.193/27, and 192.168.1.222/27 are all valid host addresses in the same subnet and are reachable at Layer 2 without routing. That makes A, C, and D correct.
NEW QUESTION # 21
On the OSPF network shown in the figure, all IP addresses can communicate with each other. Then the following configurations are added on R1:
[R1] acl 3000
[R1-acl4-advance-3000] rule deny ip source 10.0.1.1 0.0.0.0
[R1-acl4-advance-3000] rule deny ip source 10.1.1.1 0.0.0.0
[R1-acl4-advance-3000] rule permit ip source 10.3.1.1 0.0.0.0
[R1-acl4-advance-3000] rule permit ip
[R1-acl4-advance-3000] quit
[R1] traffic classifier test
[R1-classifier-test] if-match acl 3000
[R1-classifier-test] quit
[R1] traffic behavior test
[R1-behavior-test] permit
[R1-behavior-test] quit
[R1] traffic policy test
[R1-trafficpolicy-test] classifier test behavior test
[R1-trafficpolicy-test] quit
[R1] interface GE 0/0/1
[R1-GE0/0/1] traffic-policy test outbound
[R1-GE0/0/1] quit
Which IP addresses of S1 can successfully ping 10.0.23.3? (Select all that apply)
Answer: A,B,C,D
Explanation:
All four addresses can successfully ping 10.0.23.3, so the correct answer is A, B, C, D .
The key point is that the traffic policy is applied outbound on GE0/0/1 of R1, which is the interface facing S1
. When S1 pings 10.0.23.3, the echo request travels from S1 to R1 and then to S2. The return echo reply from
10.0.23.3 comes back to R1 and is then sent outbound on GE0/0/1 toward S1. Therefore, the traffic policy examines the reply packets , not the original ping request packets.
In those reply packets, the source IP address is 10.0.23.3 , and the destination is one of S1's loopback addresses. The ACL rules denying 10.0.1.1 and 10.1.1.1 as source addresses do not match these reply packets, because those addresses appear as destination addresses , not source addresses. In addition, the ACL contains rule permit ip, which permits all remaining IP traffic. As a result, replies to all four S1 addresses are forwarded successfully, so every listed address can ping 10.0.23.3.
NEW QUESTION # 22
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