A senior administrator instructs a technician to run the following script on a Linux server: for i in {1..65536); do echo Si; telnet localhost $i; done
The script mostly returns the following message: Connection refused. However, there are several entries in the console display that look like this:
80
Connected to localhost 443
Connected to localhost
Which of the following actions should the technician perform NEXT?
Correct Answer:
A
The script that the technician is running is trying to connect to every port on the localhost (the same machine) using telnet, a network protocol that allows remote access to a command-line interface. The script mostly fails because most ports are closed or not listening for connections. However, the script succeeds on ports 80 and 443, which are the default ports for HTTP and HTTPS protocols, respectively. These protocols are used for web services and web browsers. Therefore, the technician should look for an unauthorized HTTP service on this server, as it may indicate a security breach or a misconfiguration. Looking for a virus infection on this server is also possible, but not the most likely source of the issue. Looking for an unauthorized Telnet service on this server is not relevant, as the script is using telnet as a client, not a server. Looking for an unauthorized port scanning service on this server is not relevant, as the script is scanning ports on the localhost, not on other machines. References:
✑ https://phoenixnap.com/kb/telnet-windows
✑ https://www.techopedia.com/definition/23337/http-port-80
✑ https://www.techopedia.com/definition/23336/https-port-443
Which of the following licensing models is MOST appropriate tor a data center that has a variable daily equipment count?
Correct Answer:
D
A per core licensing model is based on the number of processor cores in a server. This model is suitable for a data center that has a variable daily equipment count, as it allows for scaling up or down the number of cores as needed. A per core licensing model also provides better performance and efficiency than other models. Verified References: [Per Core Licensing and Basic Definitions]
A Linux server was recently updated. Now, the server stops during the boot process with a blank screen and an£s> prompt. When of the following is the MOST likely cause of this issue?
Correct Answer:
B
The most likely cause of this issue is that the UEFI boot was interrupted by a missing Linux
boot file, such as grub.cfg or vmlinuz, which are essential for loading the Linux kernel and booting the system. The £s> prompt indicates that the system entered into UEFI Shell mode, which is a command-line interface for troubleshooting UEFI boot issues. The administrator can use UEFI Shell commands to locate and restore the missing boot file or change the boot order. Verified References: [UEFI Shell Guide]
HOTSPOT
A systems administrator deployed a new web proxy server onto the network. The proxy server has two interfaces: the first is connected to an internal corporate firewall, and the second is connected to an internet-facing firewall. Many users at the company are reporting they are unable to access the Internet since the new proxy was introduced. Analyze the network diagram and the proxy server’s host routing table to resolve the Internet
connectivity issues.
INSTRUCTIONS
Perform the following steps:
* 1. Click on the proxy server to display its routing table.
* 2. Modify the appropriate route entries to resolve the Internet connectivity issue.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.
Solution:
Does this meet the goal?
Correct Answer:
A
A server administrator is installing an OS on a new server. Company policy states no one is to log in directly to the server. Which of the following Installation methods is BEST suited to meet the company policy?
Correct Answer:
B
A core installation is a type of installation method that is best suited to meet the company policy that states no one is to log in directly to the server. A core installation is a minimal installation option that is available when deploying some editions of Windows Server. A core installation includes most but not all server roles and features, but does not include a graphical user interface (GUI). A core installation can only be managed remotely using command-line tools such as PowerShell or Windows Admin Center, or using graphical tools such as Server Manager or Remote Desktop from another computer. This reduces the attack surface, resource consumption, and maintenance requirements of the server. A GUI installation is a type of installation method that includes a graphical user interface (GUI) and allows local or remote management using graphical tools or command- line tools. A virtualized installation is a type of installation method that involves creating and running one or more virtual machines on a physical host using a hypervisor such as Hyper- V or VMware. A clone installation is a type of installation method that involves creating an exact copy of an existing server’s configuration and data on another server using tools such as Sysprep or Clonezilla. References: https://www.howtogeek.com/67469/the- beginners-guide-to-shell-scripting-the-basics/ https://www.howtogeek.com/443611/how-to- encrypt-your-macs-system-drive-removable-devices-and-individual-files/
https://www.howtogeek.com/199068/how-to-upgrade-your-existing-hard-drive-in-under-an- hour/