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| Section | Weight | Objectives |
|---|---|---|
| Security and Disaster Recovery | 24% | - Server security
|
| Troubleshooting | 28% | - Component-specific troubleshooting
|
| Server Hardware Installation and Management | 18% | - Storage technologies
|
| Server Administration | 30% | - Network and service configuration
|
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NEW QUESTION # 447
Which of the following concepts refers to prioritizing a connection that had previously worked successfully?
Answer: C
Explanation:
MRU, or Most Recently Used, is a concept that refers to prioritizing a connection that had previously worked successfully. It is often used in load balancing algorithms to distribute the workload among multiple servers or paths. MRU assumes that the most recently used connection is the most likely to be available and efficient, and therefore assigns the next request to that connection. This can help reduce latency and improve performance. The other options are incorrect because they do not refer to prioritizing a previous connection. Round robin is a concept that refers to distributing the workload equally among all available connections in a circular order.
SCP, or Secure Copy Protocol, is a concept that refers to transferring files securely between hosts using encryption. Link aggregation is a concept that refers to combining multiple physical links into a single logical link to increase bandwidth and redundancy.
NEW QUESTION # 448
A technician is configuring a point-to-point heartbeat connection between two servers using IP addressing.
Which of the following is the most efficient
subnet mask for this connection?
Answer: B
Explanation:
The most efficient subnet mask for a point-to-point heartbeat connection between two servers using IP addressing is /30. A /30 subnet mask has 255.255.255.252 as its decimal representation and
11111111.11111111.11111111.11111100 as its binary representation. This means that there are only two bits available for the host portion of the IP address, which allows for four possible combinations: 00, 01, 10, and
11. However, the first and the last combinations are reserved for the network address and the broadcast address, respectively. Therefore, only two IP addresses are usable for the point-to-point connection, which is the minimum required for such a link. A /30 subnet mask is also known as a point-to-point prefix because it is commonly used for point-to-point links between routers or servers1.
A /28 subnet mask has 255.255.255.240 as its decimal representation and
11111111.11111111.11111111.11110000 as its binary representation. This means that there are four bits available for the host portion of the IP address, which allows for 16 possible combinations. However, two of them are reserved for the network address and the broadcast address, respectively. Therefore, 14 IP addresses are usable for the subnet, which is more than needed for a point-to-point connection and would result in wasted addresses.
A /29 subnet mask has 255.255.255.248 as its decimal representation and
11111111.11111111.11111111.11111000 as its binary representation. This means that there are three bits available for the host portion of the IP address, which allows for eight possible combinations. However, two of them are reserved for the network address and the broadcast address, respectively. Therefore, six IP addresses are usable for the subnet, which is still more than needed for a point-to-point connection and would result in wasted addresses.
A /32 subnet mask has 255.255.255.255 as its decimal representation and
11111111.11111111.11111111.11111111 as its binary representation. This means that there are no bits available for the host portion of the IP address, which allows for only one possible combination: all ones.
Therefore, only one IP address is usable for the subnet, which is not enough for a point-to-point connection and would result in an invalid configuration.
Therefore, a /30 subnet mask is the most efficient choice for a point-to-point heartbeat connection between two servers using IP addressing because it provides exactly two usable IP addresses without wasting any addresses or creating any conflicts1.
NEW QUESTION # 449
A systems administrator recently installed a new virtual server. After completing the installation, the administrator was only able to reach a few of the servers on the network. While testing, the administrator discovered only servers that had similar IP addresses were reachable. Which of the following is the most likely cause of the issue?
Answer: B
Explanation:
A subnet mask is a number that distinguishes the network address and the host address within an IP address. A subnet mask allows network traffic to understand IP addresses by splitting them into the network and host addresses. If the subnet mask is incorrect, the network traffic may not be able to determine the correct destination for the packets, and only reach some of the servers that have similar IP addresses. For example, if the new virtual server has an IP address of
192.168.1.100 and a subnet mask of 255.255.0.0, it can only communicate with servers that have IP addresses in the range of 192.168.0.0 to 192.168.255.2552. To fix this issue, the systems administrator needs to check and correct the subnet mask of the new virtual server according to the network configuration.
NEW QUESTION # 450
An administrator needs to disable root login over SSH. Which of the following tiles should be edited to complete this task?
Answer: C
NEW QUESTION # 451
An administrator needs to disable root login over SSH. Which of the following tiles should be edited to complete this task?
Answer: C
Explanation:
To disable root login over SSH, the server administrator needs to edit the SSH configuration file located at
/etc/ssh/sshd_config. This file contains various settings for the SSH daemon that runs on the server and accepts incoming SSH connections. The administrator needs to find the line that says PermitRootLogin and change it to no or comment it out with a # symbol. Then, the administrator needs to restart the SSH service for the changes to take effect. References:
https://www.howtogeek.com/828538/how-and-why-to-disable-root-login-over-ssh-on-linux/
NEW QUESTION # 452
......
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