A wireless technician wants to implement a technology that will allow user devices to automatically navigate to the best available frequency standard.Which of the following technologies should the technician use?
Answer(s): A
Band steering is a technology used in wireless networks to automatically guide devices to the most appropriate frequency band, typically 2.4 GHz or 5 GHz. This ensures that devices are directed to the best available band based on factors like network congestion and signal strength, thereby optimizing the user experience. The other options do not directly relate to automatic navigation to the best frequency band: a wireless LAN controller manages network configuration but does not directly steer devices, a directional antenna focuses signal direction but does not manage frequency bands, and an autonomous access point operates independently but does not perform band steering.
A user called the help desk after business hours to complain that files on a device are inaccessible and the wallpaper was changed. The network administrator thinks that this issue is an isolated incident, but the security analyst thinks the issue might be a ransomware attack.Which of the following troubleshooting steps should be taken first?
The first step in troubleshooting is to identify the problem. Before jumping to conclusions or forming theories, it's essential to gather all available information about the issue. In this case, understanding whether the issue is indeed related to a ransomware attack or if it's an isolated incident requires careful investigation. This step will help clarify the symptoms and lead to a more informed diagnosis. Once the problem is identified, the next steps (like establishing a theory or creating a plan of action) can be undertaken based on the findings.
A data center interconnect using a VXLAN was recently implemented. A network engineer observes slow performance and fragmentation on the interconnect.Which of the following technologies will resolve the issue?
Answer(s): D
VXLAN (Virtual Extensible LAN) encapsulates Ethernet frames in UDP packets, which can lead to fragmentation if the maximum transmission unit (MTU) size is not properly configured. Jumbo frames are Ethernet frames that exceed the standard MTU of 1500 bytes, allowing larger payloads to be transmitted without fragmentation. Enabling jumbo frames on the interconnect will allow the VXLAN traffic to pass without fragmentation, improving performance. The other options are not directly related to resolving fragmentation issues with VXLAN: 802.1Q tagging is used for VLAN tagging, spanning tree manages network loops, and link aggregation increases bandwidth but does not address fragmentation.
A new server is deployed in a trusted zone and is validated to be online with all appropriate services running. However, users in a perimeter network cannot access the server.Which of the following should a network administrator do to resolve the reported issue?
Answer(s): B
Since the server is deployed in a trusted zone and is running properly, the most likely cause of the issue is a firewall or access control list (ACL) blocking traffic from the perimeter network to the server. Updating the firewall ACL to allow access from the perimeter network to the server will resolve the issue and ensure that the appropriate traffic can flow through the firewall.
Network administrators are using the Telnet protocol to administer network devices that are on the 192.168.1.0/24 subnet.Which of the following tools should the administrator use to best identify the devices?
nmap is a powerful network scanning tool that can be used to discover devices on a network, identify open ports, and gather information about the devices, including which services are running. This makes it ideal for identifying devices on the 192.168.1.0/24 subnet, which is the goal in this scenario.
A network administrator recently updated configurations on a Layer 3 switch. Following the updates, users report being unable to reach a specific file server.Which of the following is the most likely cause?
The most likely cause of the issue is incorrect ACLs (Access Control Lists). ACLs control the traffic that is allowed or denied between devices on a network, and if they were misconfigured during the update to the Layer 3 switch, they could block access to the file server. This is a common issue when ACLs are not properly adjusted after configuration changes, leading to connectivity problems.
A network engineer wants to implement a solution where all web servers will send event data over port 514.Which of the following services will accomplish this task?
Syslog is a standard protocol used for sending log or event data from devices, including web servers, to a centralized logging server. Port 514 is the default port used for Syslog communication. This protocol is commonly used for collecting and managing log data, which fits the requirement for the web servers to send event data over this specific port.
A security administrator wants to discover zero-day attacks before they can be used on the company's network.Which of the following can the administrator use to accomplish this task?
A honeypot is a security mechanism designed to attract and trap potential attackers by simulating vulnerable systems or services. By deploying a honeypot, a security administrator can observe attack techniques and behaviors, including zero-day attacks, in a controlled environment. This allows the administrator to discover and analyze new threats before they can be used on the company's actual network.
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