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NEW QUESTION # 134
AAA is short for authentication, authorization, and accounting. The accounting function records only the fees incurred when users use network resources, but not the Internet access traffic or duration.
Answer: A
Explanation:
The accounting function in AAA records user activity details such as login/logout times, session duration, accessed services, and traffic statistics. It is not limited to recording fees; it also tracks usage data for auditing, monitoring, and billing purposes.
NEW QUESTION # 135
On the network shown in the figure, if sent by Host A, data frames with which of the following destination MAC addresses can be received by Host B and Host C at the same time?
Answer: A,D
Explanation:
The destination address FF-FF-FF-FF-FF-FF is the Ethernet broadcast address. A switch floods a broadcast frame through the other eligible ports in the same VLAN, so both Host B and Host C can receive the frame.
Option C, 53-80-C2-00-00-01, is a multicast MAC address because the individual/group bit, which is the least significant bit of the first octet, is 1. The first octet 0x53 has a binary least significant bit of 1, identifying a group address. Multicast frames may therefore be delivered to multiple receivers in the same Layer 2 domain, depending on multicast handling and membership behavior. By contrast, the first octets in options B and D,
0x98 and 0x34, have a least significant bit of 0 and are unicast addresses. A unicast frame is intended for a single MAC destination and is not normally delivered simultaneously to both hosts. Therefore A and C are the correct choices. This classification is fundamental when predicting whether a switched Ethernet frame is delivered to one station or replicated to multiple receivers simultaneously.
NEW QUESTION # 136
During VLAN planning for a campus network, VLAN IDs for different service types must be allocated consecutively, without redundancy, to prevent omissions in future allocations.
Answer: A
Explanation:
This statement is false. In campus network VLAN planning, VLAN IDs do not have to be allocated strictly consecutively without any gaps. In fact, leaving some reserved VLAN IDs is often a practical and recommended design approach. VLAN planning should focus on clarity, scalability, maintainability, and service separation, rather than on forcing all VLAN IDs to be contiguous.
For example, an administrator may reserve certain VLAN ranges for user access, voice services, management, wireless services, guest access, future expansion, or specific departments. Such structured planning makes later network expansion easier and reduces the risk of service conflicts or disruptive renumbering. HCIA-Datacom emphasizes that good campus network planning should consider current requirements and future growth. Consecutive allocation may look tidy at first, but it can actually reduce flexibility and make later additions more difficult.
Therefore, the idea that VLAN IDs must be assigned consecutively without redundancy to avoid omissions is not a correct design principle. Reasonable reservation and categorized allocation are often more beneficial in real enterprise campus networks.
NEW QUESTION # 137
The IPv6 header is also called a fixed header, which contains eight fields. The total length of the fixed header is 40 bytes. Which of the following fields does an IPv6 header include?
Answer: A,B,C
Explanation:
The IPv6 basic header has a fixed length of 40 bytes and contains eight fields: Version, Traffic Class, Flow Label, Payload Length, Next Header, Hop Limit, Source Address, and Destination Address. The Source IPv6 Address is therefore part of the IPv6 header. Hop Limit is also present and serves a function comparable to the IPv4 TTL field by limiting how many Layer 3 forwarding hops a packet can traverse. Next Header identifies the type of extension header or upper-layer protocol that follows the IPv6 basic header. A source MAC address is not part of the IPv6 header. MAC addresses belong to the data-link-layer frame header, such as an Ethernet header, and are relevant only to the current Layer 2 segment. As an IPv6 packet is routed, Ethernet source and destination MAC addresses can change from hop to hop while the IPv6 source and destination addresses normally remain unchanged end to end. Therefore A, B, and C are IPv6 header fields, while D is not. The correct answer is A, B, and C.
NEW QUESTION # 138
Assume that you cannot configure an IP address for GE1/0/1 on a Huawei switch. Which of the following commands can you run in the interface view to resolve this problem?
Answer: D
Explanation:
On Huawei switches, a physical Ethernet interface usually works as a Layer 2 switch port by default. A Layer
2 interface cannot be assigned an IP address directly. If an administrator wants to configure an IP address on such an interface, the interface must first be converted into a Layer 3 interface. The command used for this is undo portswitch, so option B is correct.
After this command is executed, the interface no longer behaves as a Layer 2 switching port and can then support Layer 3 features such as direct IP address configuration. Options A, C, and D are all Layer 2 port-type commands used to configure the interface as a trunk, access, or hybrid port. These commands do not solve the problem because they keep the interface operating at Layer 2. HCIA-Datacom emphasizes the difference between Layer 2 switching interfaces and Layer 3 routed interfaces on switches. Understanding when to use undo portswitch is important in campus network deployment, especially when configuring routed uplinks, management interfaces, or inter-device Layer 3 links on switches.
NEW QUESTION # 139
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