Operating Systems
Which Windows tool scans and repairs protected system files?+
- • chkdsk
- • diskpart
- ✓ sfc /scannow
- • gpupdate
System File Checker verifies protected OS files and replaces corrupted ones. chkdsk checks the file system and disk surface.
Which file system supports file-level permissions and EFS encryption on Windows?+
- • FAT32
- • exFAT
- • ext4
- ✓ NTFS
NTFS supports ACL permissions, EFS encryption, compression and journaling. FAT32 and exFAT have no permission model.
Which macOS feature provides automatic incremental backups?+
- ✓ Time Machine
- • Spotlight
- • Keychain
- • Boot Camp
Time Machine keeps hourly, daily and weekly incremental snapshots on an external or network drive.
Which command shows a Windows PC IP address, subnet mask and default gateway?+
- • netstat
- ✓ ipconfig
- • tracert
- • nslookup
ipconfig shows adapter IP settings. ipconfig /all adds DNS servers, MAC address and DHCP details.
Which command releases and then requests a new DHCP address on Windows?+
- • ipconfig /flushdns then ipconfig /all
- • netstat -r then route add
- ✓ ipconfig /release then ipconfig /renew
- • ping -t then tracert
ipconfig /release drops the current lease and ipconfig /renew requests a new one from the DHCP server.
Which command clears the local DNS resolver cache on Windows?+
- • ipconfig /renew
- • nslookup /clear
- • netstat -f
- ✓ ipconfig /flushdns
ipconfig /flushdns clears cached name resolutions so the PC queries DNS again.
