ccna discovery 4 0

CCNA Study Notes 4 --- vro Startup Process and register value◆ Role of the vro register value (after understanding, used to adjust the optimization of the vro switch work) power-on self-check (post) load and run boot guide microcode to search for IOS image) file loading IOS image file search configuration file loading configuration file normal operation hex 2102 two Bytes 8 bits, sixth adjustable process: ◎

· Dynamic Routing : a route that can be self-adjusted based on network structure or traffic changes· category :1. Distance vector Routing Protocol (DV): RIP, IGRP Send routing entry via routing protocol2, Link State routing Protocol (LS): OSPF, Is-is No routing entries, only by collecting link information to calculate the route3. Hybrid routing protocol: EIGRP nature is the distance vector routing protocol, but has the function of link state· Distance Vector routing protocol:By periodically repl

Nginx stats in a variable for future parsingnginx_stats=$ ($WGET _bin-q $URL-O-2>/dev/null) # Error during retrieveIf [$?-ne 0-o-Z "$NGINX _stats"]; ThenEcho $ERROR _dataExit 1Fi ## Extract data from Nginx stats#Case $ZBX _req_data inActive_connections) echo "$NGINX _stats" | head-1 | cut-f3-d ';Accepted_connections) echo "$NGINX _stats" | Grep-ev ' [a-za-z] ' | Cut-f2-d ';Handled_connections) echo "$NGINX _stats" | Grep-ev ' [a-za-z] ' | cut-f3-d ';

) Increase the sequence record of the TABLE1 table in the Mycat_sequence table in the databaseINSERT into mycat_sequence (name,current_value,increment) VALUES ('tb_auto_increment'1);The current value is 100 and the step size is 1Test using:First set of test cases:Insert into Tb_auto_increment (name)values('increment_01'); Select * from Select* from Tb_auto_increment;SelectSelect last_insert_id ();The second set of test cases:Insert into Tb_auto_increment (name)values('increment_02'); Select