Which of the following is a connectionless transport layer protocol？（）

单项选择题Whichofthefollowingisaconnectionorientedtransportlayerprotocol？（）

A. TCP
B. UDP
C. TFTP
D. SNMP

单项选择题Aserverwillnotpoweron.WhichofthefollowingdevicesshouldtheadministratoruseFIRSTto determinetheproblem？（）

A. Loop back plugs
B. Power supply tester
C. System logs
D. TDR

单项选择题An administrator is upgrading memory on the server. Once the server in turned back on， the administrator notices that the memory has not changed. The system board website says the board should accept the new amount of memory.  Which of the following should the administrator do FIRST？（）

A. Replace memory chips with known good memory chips.
B. Reseat the memory chips.
C. Update the BIOS.
D. Upgrade the server OS.

单项选择题Whichofthefollowingdeviceswouldbeinstalledifanadministratorwantstocontrolagroupof serversfromaremotelocation？（）

A. VLAN
B. KVM
C. IP KVM
D. RAID

单项选择题Weekly backups of the system are done on Sundays， and daily backups are done the rest of the week.  Which of following backup methods were used if the system crashes on Friday and only requires two backup sets to recover the system？（）

A. Incremental and snapshot
B. Full and differential
C. Full and incremental
D. Differential and incremental