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NEW QUESTION # 113
OSPF supports the division of a network into areas, each identified by an area ID that ranges from 0 to 255.
Area 0 is designated as the backbone area.
Answer: B
Explanation:
This statement is false because although Area 0 is indeed the backbone area , the statement about the area ID range is incorrect. In OSPF, the area ID is a 32-bit value , which can be represented either in decimal format or in IPv4 address format such as 0.0.0.0. It is not limited to the numeric range 0 to 255 .
For example, an area can be configured as 0, 1, 100, or in dotted-decimal form such as 0.0.0.1 or 0.0.0.10, depending on implementation and configuration style. HCIA-Datacom teaches that OSPF uses hierarchical area design to improve scalability, reduce SPF calculation scope, and optimize LSA flooding. The backbone area , which is Area 0, serves as the transit area connecting all non-backbone areas in a standard OSPF design. Therefore, the second part of the statement is correct, but the first part is wrong, making the entire statement false. This question tests whether the learner understands both the function of Area 0 and the actual format of OSPF area identifiers.
NEW QUESTION # 114
On the OSPF network shown in the figure, R1 has a route to 10.0.0.0/30, with the next hop being
30.1.1.2 by default.
Answer: B
Explanation:
The destination network 10.0.0.0/30 is directly connected to the right-side router (R3). From R1, there are two OSPF paths to reach R3: a direct link (cost 10) and an indirect path via the top router (cost 20). OSPF selects the lowest-cost path, which is the direct link to R3. Therefore, R1's next hop toward 10.0.0.0/30 is 30.1.1.2, making the statement correct.
NEW QUESTION # 115
With the development of data centers, a large number of services are deployed on virtual machines (VMs). The original VLAN isolation solution cannot achieve isolation between so many VMs. VXLAN uses VXLAN Network Identifiers (VNIs) to provide a larger range than VLAN IDs, so that a larger number of VMs can be isolated.
Answer: B
Explanation:
This statement is true. Traditional VLANs use a 12-bit VLAN ID, which means that only about
4094 usable VLANs are available. In modern data centers, especially in cloud and virtualization environments, that scale is often insufficient because a very large number of tenants, services, and virtual machines need isolated network segments.
VXLAN addresses this limitation by introducing the VNI (VXLAN Network Identifier), which is 24 bits long. This allows support for up to about 16 million logical segments, greatly expanding the number of isolated Layer 2 networks that can be created across an IP underlay. Because of this, VXLAN is widely used in modern data centers to provide scalable tenant isolation, flexible service deployment, and large Layer 2 extension across physical boundaries. HCIA-Datacom highlights VXLAN as a key overlay technology that solves the VLAN scale problem in virtualized data center environments. It allows a much larger number of VMs and tenants to be isolated than traditional VLAN-based solutions can support, making it essential for modern cloud-oriented and large-scale data center networking.
NEW QUESTION # 116
What is the broadcast address of the network that contains a host with IP address 192.168.1.147/28?
Answer: D
Explanation:
A /28 subnet mask corresponds to 255.255.255.240, which means each subnet contains 16 IP addresses . The subnet boundaries in the last octet increase in steps of 16: 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, and so on. The host address 192.168.1.147 falls within the subnet range 192.168.1.144 to 192.168.1.159 .
In that subnet, the network address is 192.168.1.144, the usable host range is 192.168.1.145 through
192.168.1.158, and the broadcast address is 192.168.1.159. Therefore, option C is correct. Option D is the first usable host address, not the broadcast address. Option A is just another usable host address. Option B would be the broadcast address only for a /24 network, not for a /28. HCIA-Datacom requires learners to master subnetting because it is essential for IP planning, gateway deployment, route summarization, and troubleshooting Layer 3 communication issues in campus and enterprise networks.
NEW QUESTION # 117
With the continuous development of AI, data center application scenarios are gradually divided into general-purpose computing and intelligent computing scenarios. Data centers need to ensure service continuity of general-purpose computing clusters while unleashing the full potential of intelligent computing clusters, so as to guarantee stable and efficient operation in the AI era.
Which of the following statements are true about the service requirements of data center networks in the two scenarios? (Select all that apply)
Answer: A,B
Explanation:
The correct statements are B and C. Option B is true because general-purpose computing data center networks focus heavily on stability, reliability, service continuity, and flexible VM deployment. Technologies such as M-LAG improve gateway and uplink redundancy and support fast failover, while VXLAN enables large-scale Layer 2 extension for VM mobility and resource flexibility.
Option C is also true because intelligent computing networks, especially those serving AI training and distributed GPU clusters, require an extremely low-loss or lossless forwarding environment.
Technologies such as PFC and ECN are standard methods used to build such networks and reduce congestion-related packet loss.
NEW QUESTION # 118
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