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NEW QUESTION # 154
Which of the following layers in the OSI model is responsible for establishing, maintaining, and terminating connections between nodes?
Answer: D
Explanation:
TheSession Layer(Layer 5 of the OSI Model) is responsible for setting up, managing, and tearing down sessions between applications. It maintains dialog control and synchronizes data exchange between systems.
NEW QUESTION # 155
Which of the following steps of the troubleshooting methodology should a technician take to confirm a theory?
Answer: B
Explanation:
To confirm a theory in the troubleshooting process, the technician should duplicate (replicate) the problem under controlled conditions. In the Network+ (N10-009) methodology, confirming a theory means validating that the suspected cause actually produces the observed symptoms. Replicating the issue helps ensure the technician is not chasing a coincidence, and it allows changes to be tested safely (for example, reproducing the issue with a specific user account, endpoint, cable, port, SSID, or configuration). If the problem can be duplicated, the technician can then try targeted actions to see whether the symptoms change in predictable ways-strengthening or disproving the hypothesis.
The other choices occur earlier as part of forming the theory. Identify the symptoms is an initial step to define the problem clearly. Gather information is part of the discovery phase-collect logs, error messages, topology details, and user observations. Determine any changes is also an early step used to correlate recent modifications (patches, new devices, config changes) with the onset of the issue. Those steps help create a theory; duplication helps confirm it before implementing a full fix.
NEW QUESTION # 156
A VoIP phone is plugged in to a port but cannot receive calls. Which of the following needs to be done on the port to address the issue?
Answer: A
Explanation:
* Understanding VoIP and VLANs:
* VoIP (Voice over IP) phones often use VLANs (Virtual Local Area Networks) to separate voice traffic from data traffic for improved performance and security.
* Tagging Traffic to Voice VLAN:
* Voice VLAN Configuration: The port on the switch needs to be configured to tag traffic for the specific voice VLAN. This ensures that voice packets are prioritized and handled correctly.
* VLAN Tagging: VLAN tagging allows the switch to identify and separate voice traffic from other types of traffic on the network, reducing latency and jitter for VoIP communications.
* Comparison with Other Options:
* Trunk all VLANs on the port: Trunking all VLANs is typically used for links between switches, not for individual device ports.
* Configure the native VLAN: The native VLAN is for untagged traffic and does not address the need for separating and prioritizing voice traffic.
* Disable VLANs: Disabling VLANs would mix voice and data traffic, leading to potential performance issues and lack of traffic separation.
* Implementation:
* Configure the switch port connected to the VoIP phone to tag the traffic for the designated voice VLAN, ensuring proper network segmentation and quality of service.
NEW QUESTION # 157
Two network switches at different locations are connected via fiber-optic cable at a distance of 10 miles (16 km). The duplex fiber-optic patch cord between the patch panel and switch is accidentally pinched, stopping connectivity between the two switches. A network technician replaces the broken cable with a new, single- mode patch cord. However, connectivity between both switches is still down and the link lights are still off.
Which of the following actions should the technician perform first?
Answer: D
Explanation:
Fiber connections require Tx on one end to connect to Rx on the other end. If the patch cord is replaced and link lights remain off, the most common cause is that the connectors are reversed. Swapping (transposing) the connectors ensures proper transmit/receive alignment.
A). Replacing the transceiver may eventually be necessary, but only after verifying correct connections.
B). Restarting the switchport won't resolve a physical misconnection.
D). Using multimode fiber would be incorrect here, as the link was designed for single-mode (10 miles/16 km requires SMF).
References (CompTIA Network+ N10-009):
Domain: Network Troubleshooting - Fiber connectivity, Tx/Rx alignment, link light diagnostics.
NEW QUESTION # 158
Which protocol provides encryption, integrity, and authentication for data inside a VPN tunnel?
Answer: B
Explanation:
ESP (Encapsulating Security Payload) is an IPsec protocol that provides encryption, integrity, and authentication for data inside a VPN tunnel. It ensures that all tunneled traffic is encrypted.
* B. SSH secures remote terminal sessions, not site-to-site VPN tunnels.
* C. GRE (Generic Routing Encapsulation) provides encapsulation but does not encrypt data.
* D. IKE (Internet Key Exchange) negotiates keys and establishes the IPsec tunnel but does not encrypt the payload itself.
References (CompTIA Network+ N10-009):
* Domain: Network Security - VPN protocols, IPsec (AH vs. ESP), encryption in transit.
NEW QUESTION # 159
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