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NEW QUESTION # 11
In the WLAN networking, multiple APs can broadcast the same SSID and belong to the same BSSID, allowing STAs to stay connected to the same wireless network wherever they move.
Answer: B
Explanation:
In WLAN networks, multiple APs can broadcast the same SSID to provide seamless roaming for STAs, but they do not share the same BSSID. Each AP has a unique BSSID (typically the MAC address of its radio interface). Roaming works based on SSID consistency while maintaining different BSSIDs per AP, so the statement is incorrect.
NEW QUESTION # 12
In the figure, a TCP connection has been established between PC1 and PC2. After PC1 sends a data segment to PC2, which of the following is the acknowledgment number in the packet returned by PC2?
Answer: A
Explanation:
In TCP, the acknowledgment number indicates the next byte that the receiver expects to receive. In the figure, PC1 sends a TCP segment to PC2 with sequence number = a+22 and payload length = 22 bytes .
Since TCP sequence numbers count bytes, the last byte carried in this segment corresponds to sequence number a+43 . Therefore, after PC2 successfully receives this data, it sends back an ACK indicating that the next expected byte is a+44 .
That is why option B is correct. This is a standard TCP reliability mechanism. TCP does not acknowledge
"packets" as units; it acknowledges the byte stream. The ACK number always points to the next byte expected from the peer. The source and destination port numbers identify the session, but the sequence and acknowledgment numbers track ordered delivery. HCIA-Datacom uses this mechanism to explain connection- oriented transport, reliable delivery, retransmission, and traffic control. Understanding how the payload length affects sequence progression is essential when analyzing packet captures and troubleshooting TCP communication problems in enterprise networks.
NEW QUESTION # 13
On the network shown in the figure, PC1 and PC4 belong to VLAN 10, and PC2 and PC3 belong to VLAN
20. The administrator has configured the vlan batch 10 20 command on both switches.
To enable Layer 2 communication between PCs in the same VLAN and isolate services between VLANs, match the following interface configurations with interfaces. (Tokens can be reused.)
Answer:
Explanation:
Explanation:
A, B, D, B, A, D
Interface-based VLAN assignment associates an incoming untagged Ethernet frame with the VLAN configured on its access interface.
On SW1, GE1/0/1 connects PC1 and therefore belongs to VLAN 10. GE1/0/2 connects PC2 and belongs to VLAN 20.
On SW2, GE1/0/1 connects PC3 and belongs to VLAN 20, while GE1/0/2 connects PC4 and belongs to VLAN 10.
The inter-switch interfaces GE1/0/3 must carry traffic belonging to both VLANs while preserving VLAN identification. Configuring these interfaces as hybrid ports with tagged forwarding for VLANs 10 and 20 achieves this requirement.
Using untagged forwarding for both VLANs on the inter-switch connection would remove their VLAN tags and prevent the receiving switch from reliably distinguishing the two VLANs.
NEW QUESTION # 14
Which of the following SNMP messages is sent unsolicited to the NMS by a managed device to report some urgent and significant events (such as a restart of the managed device)?
Answer: A
Explanation:
In SNMP, a Trap message is sent asynchronously and unsolicited from a managed device to the NMS to report important or urgent events such as device restart, link failures, or threshold alarms.
It does not require a response from the NMS, unlike Inform messages.
NEW QUESTION # 15
Which of the following statements are true about the Python code shown below? (Select all that apply) import paramiko import time ssh = paramiko.SSHClient() ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) ssh.connect('192.168.1.254', username='python', password='Huawei@123') channel = ssh.invoke_shell() channel.send('screen-length 0 temporary\n') time.sleep(1) output = channel.recv(65535).decode('utf-8') print(output) ssh.close()
Answer: A,B,C,D
Explanation:
All four statements are correct. The code uses the Paramiko library to automate SSH login to a network device. import paramiko and import time load the Python modules required for SSH communication and delay control, so option C is correct. The statement ssh = paramiko.SSHClient() creates an SSH client object, and ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) allows the client to accept an unknown host key automatically in this example scenario.
The command ssh.connect('192.168.1.254', username='python', password='Huawei@123') establishes an SSH connection to the target device, so option B is correct. Then channel = ssh.invoke_shell() opens an interactive shell channel, which is commonly used to send CLI commands and receive output just as an administrator would in a terminal session, making option D correct. The command channel.send('screen-length 0 temporary\n') disables page-by-page output for the current session, which is useful in network automation. Finally, ssh.close() closes the SSH session and releases the connection, so option A is correct. HCIA-Datacom automation knowledge often uses Paramiko examples to demonstrate basic Python-based device O&M.
NEW QUESTION # 16
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