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NEW QUESTION # 110
Which of the following DHCPv4 messages are sent by a DHCPv4 server?
Answer: B,D
Explanation:
The normal DHCPv4 address-allocation exchange is commonly summarized as DORA: Discover, Offer, Request, and Acknowledge. A DHCP client that needs configuration begins by sending DHCPDISCOVER to locate available DHCP servers. A server responds with DHCPOFFER, proposing an address and other parameters. The client then sends DHCPREQUEST to indicate the offered address and server it has selected.
Finally, the selected DHCP server sends DHCPACK to confirm the lease and deliver the final configuration.
Therefore, DHCPDISCOVER and DHCPREQUEST are client-originated messages in the standard allocation process, while DHCPOFFER and DHCPACK are server-originated messages. DHCP also defines other messages for lease renewal, decline, release, and negative acknowledgment, but those are not among the answer choices. For the options provided, A, DHCPACK, and D, DHCP OFFER, are the messages sent by a DHCPv4 server. The verified answer is A and D. This server-versus-client message direction is fundamental when interpreting DHCP packet captures and troubleshooting address-allocation failures on enterprise campus access networks.
NEW QUESTION # 111
After checking the status of GE0/0/1 on R1, you obtain the command output shown below. Which of the following statements are true? (Choose all that apply.)
Answer: A,B,D
Explanation:
The interface status shows both the physical layer and line protocol are UP, confirming the physical status is UP. The output explicitly indicates PVID: 1, so the VLAN ID is 1. The hardware address field displays b0c7-8733-d65c, which is the MAC address of the interface. The port mode is COMMON COPPER, meaning it is a copper Ethernet interface rather than an optical interface, so the statement about optical type is incorrect.
NEW QUESTION # 112
After the root bridge is elected on an STP network, which of the following parameters may be compared by ports on non-root bridge nodes to elect the root port? (Select all that apply)
Answer: A,B,C,D
Explanation:
On a non-root bridge, the root port is the port that receives the best BPDU toward the root bridge. STP selects the root port by comparing several parameters in order. The first important parameter is the root path cost (RPC) , so option B is correct. If multiple ports have the same RPC, the switch then compares the bridge ID (BID) of the upstream device sending the BPDU, making option C correct. If those are still equal, the switch compares the port ID (PID) of the upstream sending port, so option D is also correct.
If all of those values remain identical from the switch's perspective, the device can finally compare the local port ID to determine which local interface becomes the root port, so option A is also correct. HCIA-Datacom teaches this comparison logic as part of STP election rules. The process ensures deterministic selection of a single root port on every non-root switch. Understanding the comparison sequence is essential for predicting STP topology behavior and for influencing port roles through path cost tuning or bridge-priority adjustments during campus network design and troubleshooting.
NEW QUESTION # 113
PC1 and PC2 are connected to the same switch, but they cannot learn each other's ARP information. This may be caused by incorrect VLAN configuration on the switch.
Answer: A
Explanation:
This statement is true . ARP is a Layer 2 broadcast-based protocol used to resolve an IPv4 address into a MAC address within the same broadcast domain. If two PCs are connected to the same switch but cannot learn each other's ARP entries, one likely reason is an incorrect VLAN configuration .
For example, if PC1 and PC2 are placed in different VLANs, or if one interface is configured with the wrong access VLAN, ARP broadcast frames from one PC will not reach the other PC because VLANs separate Layer 2 broadcast domains. As a result, the ARP request will not be received by the peer, and the MAC address cannot be resolved. Other causes may also exist, such as incorrect IP addressing, port isolation, or security policies, but VLAN misconfiguration is a very common and valid cause in campus switching scenarios. HCIA-Datacom teaches that ARP communication depends on correct Layer 2 domain membership, and VLAN planning or interface configuration errors often directly affect host-to-host communication even when both hosts are physically connected to the same switch.
NEW QUESTION # 114
If host A wants to communicate with host B, which is on another subnet, host A broadcasts an ARP request to obtain host B's MAC address. After receiving the request, host B replies with an ARP response to notify host A of its MAC address.
Answer: B
Explanation:
ARP broadcasts are used only within the same local subnet to resolve IP addresses into MAC addresses. When the destination host is on a different subnet, the sender does not try to resolve the remote host's MAC address directly; instead, it uses the default gateway's MAC address to forward the packet.
NEW QUESTION # 115
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