CompTIA Updated XK0-005 Exam Questions and Answers by ray

The ip link show eth1 command can be used to check the link status of a network interface named eth1 in a Linux server. It will display information such as the MAC address, MTU, state, and flags of the interface. The ifconfig hw eth1 command is invalid, as hw is not a valid option for ifconfig. The netstat -r eth1 command would display the routing table for eth1, not the link status. The ss -ti eth1 command would display TCP information for sockets associated with eth1, not the link status. References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 13: Networking Fundamentals, page 436.

The output shows that the system is running low on available memory and has heavily utilized swap space (1824 MB out of 2047 MB). This indicates that both RAM and swap are being exhausted, which can lead to performance degradation. The system is likely experiencing memory pressure and may require additional RAM or optimizations to reduce memory consumption.

The ping -c 1 192.168.47.44 command sends one ICMP echo request to the specified host to check its availability. If the host is down, there will be no response. This is the quickest way to confirm if a host is reachable. nmap -Pn can also be used to check a host status, but ping is faster and lighter.

To mirror the website files on the primary web server, www1, to the backup web server, www2, the administrator can use the command rsync -a -e ssh /var/www/html/ user1@www2:/var/www/html (A). This will synchronize all files and directories under /var/www/html/ on www1 to /var/www/html on www2 using ssh as the remote shell. The -a option will preserve all attributes and permissions of the files. The other commands will not mirror the website files, but either copy them once, download them from a web server, or archive them. References:

[CompTIA Linux+ Study Guide], Chapter 12: Troubleshooting Linux Systems, Section: Synchronizing Files with rsync

[How to Use rsync Command in Linux]