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  2. CompTIA Certification
  3. SK0-005 Exam
  4. CompTIA.SK0-005.v2024-04-11.q408 Dumps
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Question 251

Which of the following must a server administrator do to ensure data on the SAN is not compromised if it is leaked?

Correct Answer: B
The administrator must encrypt the data at rest to ensure data on the SAN is not compromised if it is leaked. Data at rest refers to data that is stored on a device or a medium, such as a hard drive, a flash drive, or a SAN (Storage Area Network). Data at rest can be leaked if the device or the medium is lost, stolen, or accessed by unauthorized parties. Encrypting data at rest means applying an algorithm that transforms the data into an unreadable format that can only be decrypted with a key. Encryption protects data at rest from being exposed or misused by attackers who may obtain the device or the medium.
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Question 252

A server in a remote datacenter is no longer responsive. Which of the following is the BEST solution to investigate this failure?

Correct Answer: D
Reference:
https://www.lantronix.com/wp-content/uploads/pdf/Data_Center_Mgmt_WP.pdf
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Question 253

Users are able to connect to the wireless network, but they are unable to access the internet. The network administrator verifies connectivity to all network devices, and there are no ISP outages. The server administrator removes the old address leases from the active leases pool, which allows users to access the internet. Which of the following is most likely causing the internet issue?

Correct Answer: B
Explanation
The most likely cause of the internet issue is B. The DHCP scope is full.
A DHCP scope is a range of IP addresses that a DHCP server can assign to DHCP clients on a network. A DHCP scope has a start address and an end address, and it can also have some excluded addresses that are not available for lease. A DHCP scope can have various options, such as subnet mask, default gateway, DNS server, etc., that are applied to the DHCP clients along with the IP address. A DHCP scope also has a lease time, which is the duration that a DHCP client can use an IP address before renewing it or releasing it. A DHCP scope can have reservations, which are fixed IP addresses that are assigned to specific DHCP clients based on their MAC addresses12 If a DHCP scope is full, it means that there are no more IP addresses available for lease in the scope. This can happen if the number of DHCP clients exceeds the number of IP addresses in the scope, or if the lease time is too long and the IP addresses are not released or reused frequently enough. If a DHCP scope is full, any new or existing DHCP clients that request an IP address from the DHCP server will not receive one, and they will not be able to access the network or the internet12 In this scenario, users are able to connect to the wireless network, but they are unable to access the internet.
The network administrator verifies connectivity to all network devices, and there are no ISP outages. The server administrator removes the old address leases from the active leases pool, which allows users to access the internet. This indicates that the DHCP scope is full, and that removing the old leases frees up some IP addresses for lease in the scope. Therefore, option B is the most likely cause of the internet issue.
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Question 254

A server administrator receives the following output when trying to ping a local host:

Which of the following is MOST likely the issue?

Correct Answer: A
Explanation
A firewall is a network device or software that filters and controls the incoming and outgoing traffic based on predefined rules. A firewall can block or allow certain types of packets, ports, protocols, or IP addresses. The output of the ping command shows that the local host is unreachable, which means that there is no network connectivity between the source and the destination. This could be caused by a firewall that is blocking the ICMP (Internet Control Message Protocol) packets that ping uses to test the connectivity. References:
https://www.comptia.org/training/resources/exam-objectives/comptia-server-sk0-005-exam-objectives (Objective 2.2)
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Question 255

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
Explanation
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
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