Andy's Cool Tech + Sec

****Linux Performance Monitoring **** Check :   CPU Utilization, Memory, Disk space, # of network connections, disk i/o top df -h  cat /proc/cpuinfo  free -m  netstat -n iostat  Other : /var/log/messages docker ps  netstat -n  java logs  Tools: New Relic ,  Nagios ,  App Dynamics  chkmk , scout--  scoutapp,com  PRTG    vCenter    monitor network traffic bits/sec Articles : http://www.brendangregg.com/blog/2017-08-08/linux-load-averages.html http://blog.scoutapp.com/articles/2009/07/31/understanding-load-averages http://www.linuxjournal.com/article/9001 https://stackoverflow.com/questions/21617500/understanding-load-average-vs-cpu-usage https://en.wikipedia.org/wiki/Load_(computing) https://www.cyberciti.biz/tips/top-linux-monitoring-tools.html https://www.tecmint.com/linux-performance-monitoring-with-vmstat-and-iostat-commands/ https://linux.101hacks....

----CCNA--- OSI Layers Spanning Tree Protocol CDP Config Files Connection/Connection-less Flow control NVRAM, Flash Card,  RAM,  CPU Reset cisco password TCP UDP ARP ICMP IP Subnets Broadcast address Secondary Addr Frame Relay Routing RIP IGRP EIGRP OSPF BGP Split Horizon Route poisoning ACL’s             Standard Extended Named WAN                 PPP                          HDLC – Serial                          PPP – UART Modem                 Frame Relay                         Address Mapping            ...