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| Section | Objectives |
|---|---|
| Topic 1: Capacity Planning | - Predicting future resource needs - Measuring and troubleshooting resource usage |
| Topic 2: System Maintenance | - Package management and updates - System recovery and backup strategies |
| Topic 3: Network Configuration | - DNS and DHCP configuration - Advanced TCP/IP configuration - Network troubleshooting tools |
| Topic 4: Linux Kernel | - Kernel compilation and configuration - Kernel components and modules |
| Topic 5: Filesystem and Storage Management | - RAID and storage troubleshooting - Advanced filesystem features - Disk partitioning and LVM |
| Topic 6: System Startup | - Boot process and systemd - Recovery and boot troubleshooting |
>> 202-450 Valid Exam Question <<
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NEW QUESTION # 50
Using its standard configuration, how does fail2ban block offending SSH clients?
Answer: C
Explanation:
Explanation
Fail2ban is a tool that monitors the system logs for failed login attempts and blocks the offending IP addresses using netfilter rules. Netfilter is a framework that provides packet filtering, network address translation, and other functions for the Linux kernel. Fail2ban uses the iptables command to manipulate the netfilter rules and create chains of rules that match the source IP address of the attacker and drop or reject the packets from that IP address. Fail2ban can also use other firewall tools, such as firewalld or ufw, to create the netfilter rules.
Fail2ban can block the IP addresses for a specified amount of time, or permanently, depending on the configuration. Fail2ban can protect various services, such as SSH, HTTP, FTP, etc., by creating different jails for each service. A jail is a set of parameters that define how to monitor a log file, how to detect a failed login attempt, how to ban an IP address, and how long to keep the ban.
Fail2ban does not block offending SSH clients by any of the other options. It does not act as a proxy in front of SSHD, nor does it modify the SSHD configuration. It does not create null routes that drop any answer packets sent to the client, nor does it modify the TCP Wrapper configuration for SSHD.
References:
How To Protect SSH with Fail2Ban on Ubuntu 20.04
How To Prevent SSH Brute Force Attacks Using Fail2ban In Linux
Fail2ban - Wikipedia
Fail2ban Manual
NEW QUESTION # 51
The Samba configuration file contains the following lines:
A workstation is on the wired network with an IP address of 192.168.1.177 but is unable to access the Samba server. A wireless laptop with an IP address 192.168.2.93 can access the Samba server. Additional trouble shooting shows that almost every machine on the wired network is unable to access the Samba server.
Which alternate host allow declaration will permit wired workstations to connect to the Samba server without denying access to anyone else?
Answer: C,D
NEW QUESTION # 52
Which tool creates a Certificate Signing Request (CSR) for serving HTTPS with Apache HTTPD?
Answer: B
Explanation:
Explanation
OpenSSL is a software library that provides cryptographic functions and tools for creating and managing SSL/TLS certificates. One of the tools included in OpenSSL is the command-line utility openssl, which can be used to generate various types of cryptographic objects, such as private keys, public keys, certificate signing requests (CSRs), and certificates. A CSR is a file that contains the information needed by a certificate authority (CA) to issue a digital certificate for a web server. A CSR includes the public key of the web server, the domain name or names that the certificate will cover, and some identifying information about the organization or individual requesting the certificate. To generate a CSR for serving HTTPS with Apache HTTPD, the openssl command can be used with the req option, which stands for request. The req option takes several parameters, such as -new, -newkey, -nodes, -keyout, and -out, to specify the details of the CSR generation process. For example, the following command will generate a new private key and a new CSR for the domain example.com, using a 2048-bit RSA algorithm, and saving the files as example.key and example.csr respectively:
openssl req -new -newkey rsa:2048 -nodes -keyout example.key -out example.csr The command will also prompt the user to enter some information for the CSR, such as the country code, state or province name, locality name, organization name, organizational unit name, common name, and email address. The common name is the most important field, as it should match the domain name or names that the certificate will cover. For example, if the certificate is for example.com, the common name should be example.com. If the certificate is for multiple domains, such as example.com and www.example.com, the common name should be one of them, and the rest should be specified as subject alternative names (SANs) in a configuration file. After the CSR is generated, it can be sent to a CA for signing and obtaining a certificate, which can then be installed and configured on the Apache HTTPD server to enable HTTPS.
References:
OpenSSL: The official website of the OpenSSL project, which provides documentation, downloads, and support for the OpenSSL software.
Apache: CSR & SSL Installation (OpenSSL) - DigiCert: A guide from DigiCert on how to create a CSR and install an SSL certificate on an Apache server using OpenSSL.
How to Generate a Certificate Signing Request (CSR) for Apache Web Server Using OpenSSL - The SSL Storeโข: A tutorial from The SSL Store on how to generate a CSR for an Apache web server using OpenSSL.
GoDaddy - Apache: Generate CSR (Certificate Signing Request): A step-by-step instruction from GoDaddy on how to generate a CSR for Apache 2.x using OpenSSL.
NEW QUESTION # 53
In order to export /usr and /bin via NFSv4, /exports was created and contains working bind mounts to /usr and /bin.
The following lines are added to /etc/exports on the NFC server:
After running mount-tnfsv4 server://mnt of an NFC-Client, it is observed that /mnt contains the content of the server's /usr directory instead of the content of the NFSv4 foot folder.
Which option in /etc/exports has to be changed or removed in order to make the NFSv4 root folder appear when mounting the highest level of the server?
(Specify ONLY the option name without any values or parameters.)
Answer:
Explanation:
mount
NEW QUESTION # 54
Fill in the blank.
In order to specify alterations to an LDAP entry, what keyword is missing from the following LDIF file excerpt?
Specify the keyword only and no other information
Answer:
Explanation:
add
NEW QUESTION # 55
......
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