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| Section | Objectives |
|---|---|
| Network Management and Troubleshooting | - Device management concepts - Basic troubleshooting tools and methods |
| IP Services | - DHCP and DNS concepts - NAT basics |
| IP Addressing and Subnetting | - IPv6 fundamentals - IPv4 addressing and subnet masks |
| Network Security Basics | - Access control lists (ACL) - Basic network security concepts |
| WLAN Basics | - Wireless networking fundamentals |
| Switching Technologies | - VLAN configuration and trunking - STP/RSTP concepts |
| Routing Technologies | - Static routing - Dynamic routing fundamentals (OSPF basics) |
| Network Fundamentals | - OSI and TCP/IP models - Basic network topologies and devices |
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NEW QUESTION # 120
Which of the following phases are required for establishing a connection between an SSH server and an SSH client? (Select all that apply)
Answer: A,B,C,D
Explanation:
The establishment of an SSH connection includes multiple mandatory phases that ensure both secure communication and authenticated access. First, the SSH client and server perform version negotiation to determine a mutually supported SSH protocol version. Then they carry out algorithm negotiation, during which they agree on the encryption algorithm, key exchange algorithm, integrity algorithm, and other security parameters to be used for the session.
After that, the peers perform key exchange, which is used to derive shared session keys securely over an insecure network. This stage is essential because it enables subsequent communication to be encrypted and protected against interception. Finally, once the secure channel has been established, user authentication is performed so that the server can verify the identity of the client user. This can be done using a password, public key, or other supported authentication method. Therefore, all four options are required phases in the SSH connection establishment process. HCIA-Datacom emphasizes these steps because SSH is a core secure management protocol used to replace insecure protocols such as Telnet and FTP in modern network operation and maintenance.
NEW QUESTION # 121
OSPF has five types of packets. Which type is used to notify an OSPF neighbor of its required LSAs?
Answer: D
Explanation:
In OSPF, the packet type used to request specific link-state advertisements from a neighbor is the Link State Request (LSR) packet. Therefore, option B is correct. During database synchronization, OSPF neighbors first discover each other with Hello packets, then exchange summaries of their databases using Database Description (DD) packets. If one router finds that it is missing certain LSAs or has older versions, it sends an LSR packet to request the needed LSAs from its neighbor.
The neighbor then responds with a Link State Update (LSU) packet containing the requested LSAs. Finally, the receiving router confirms proper receipt with a Link State Acknowledgment (LSAck) packet. HCIA- Datacom emphasizes understanding the roles of these five OSPF packet types because they are central to neighbor formation, adjacency establishment, and LSDB synchronization. This question specifically tests whether the learner can distinguish between the request packet ( LSR ) and the update packet ( LSU ). The router does not use a DD packet to request detailed LSA content; DD packets provide database summaries, while LSR packets explicitly request the LSAs that are needed.
NEW QUESTION # 122
Drag and Drop Question
When requesting an IPv4 address for the first time, a DHCPv4 client needs to exchange four messages with the DHCPv4 server. Drag and drop the DHCPv4 packets to the correct positions based on the packet interaction sequence.
Answer:
Explanation:
Explanation:
1 - DHCP DISCOVER
2 - DHCP OFFER
3 - DHCP REQUEST
4 - DHCP ACK
A DHCP client first broadcasts a Discover message to locate a DHCP server. The server responds with an Offer containing an available IP address. The client then sends a Request to confirm the selected address, and finally the server replies with an ACK to complete the allocation process.
NEW QUESTION # 123
During WLAN deployment, a Fit AP fails to go online on the WAC. You log in to the WAC and run the display ap all command to check the AP status. The command output shows that the AP status is unauth, indicating that the AP fails the authentication. You therefore need to confirm this AP on the WAC to allow the AP to go online.
Answer: A
Explanation:
When a Fit AP status is unauth on a Huawei WAC, it means the AP has not been authenticated yet by the WAC authentication policy. In this case, the AP is blocked from going online until it is manually confirmed or passes an allowed authentication mode (such as MAC/SN authentication).
Therefore, confirming the AP on the WAC is required to allow it to go online.
NEW QUESTION # 124
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,C
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 # 125
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