A network administrator changed an external DNS to point customers to a new server.Which of the following tools should the administrator use to test the new server's configuration?
Answer(s): D
nslookup queries DNS directly to retrieve records for the new hostname, allowing you to confirm that the A (or AAAA) record now points to the correct server IP and that the change has propagated.
A company is expanding to another floor in the same building. The network engineer configures a new switch with the same VLANs as the existing stack.When the network engineer connects the new switch to the existing stack, all users lose connectivity.Which of the following is the most likely reason?
Connecting the new switch created a Layer 2 loop because it wasn't properly integrated into the spanning tree, causing broadcast storms and knocking all users offline.
Which of the following is the most likely benefit of installing server equipment in a rack?
Racks enable vertical stacking of multiple servers in a compact footprint, boosting compute density.
A technician is implementing a new SD-WAN device with a default configuration. The technician receives a URL via email and connects the new device to the internet to complete the installation.Which of the following is this an example of?
Answer(s): C
The SD-WAN device used the default data VLAN (the unmarked user-data network) to reach the internet and pull its configuration.
A help desk technician receives a report that users cannot access internet URLs. The technician does some ping tests and finds that sites fail when a URL is used but work when an IP is used.Which of the following tools should the technician utilize next?
The dig tool directly queries DNS servers to verify name resolution, helping identify why URLs aren't resolving even though IP connectivity works.
Which of the following is the part of a DR plan that identifies the critical systems that should be recovered first after an incident?
Answer(s): A
The Recovery Time Objective specifies how quickly each critical system must be back online after an incident, effectively ranking them so those with the shortest RTOs are recovered first.
Which of the following is the best VPN to use for reducing data bandwidth requirements of the corporate network?
A split-tunnel VPN sends only corporate-bound traffic through the tunnel while letting other traffic go directly to the internet, reducing bandwidth consumption on the corporate network.
An ISP provided a company with a pre-configured modem and five public static IP addresses.Which of the following does the company's firewall require to access the internet? (Choose two.)
Answer(s): B,D
The firewall's WAN interface must be assigned one of the ISP-provided static IPs.The firewall also needs the ISP's default gateway to route outbound traffic to the internet.
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