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ReplyDeleteIT Notes Part- 3
ReplyDeletePhysical level : how the data is stored physically and where it is stored in database.
Logical level : what data are stored in the database, and what relationships exist among those data
View level : part of the entire database
PORT NUMBERS
20-FTP data (File Transfer Protocol)
21-FTP Control(File Transfer Protocol)
22-SSH (Secure Shell)
23-Telnet
25 -SMTP(Simple Mail Transfer Protocol)
43-whois
53-DNS (Domain Name Service)
68-DHCP (Dynamic Host Configuration Protocol)
79-Finger
80-HTTP (HyperText Transfer Protocol)
110-POP3 (Post Office Protocol, version 3)
115-SFTP (Secure File Transfer Protocol)
119-NNTP (Network New Transfer Protocol)
123-NTP (Network Time Protocol)
137-NBNS (NetBios naming service)
138-NetBiosDatagram Service
139-NetBIOS Session service
143-IMAP (Internet Message Access Protocol)
161-SNMP (Simple Network Management Protocol)
194-IRC (Internet Relay Chat)
220-IMAP3 (Internet Message Access Protocol 3)
443-SSL (Secure Socket Layer)
445-SMB (NetBIOS over TCP) Server message block
993-SIMAP (Secure Internet Message Access Protocol)
3389-RDP(RemoteDesktop Protocol)
TRACKS-A ring on a disk where data can be written( concentric circles)
SECTOR-Each track is divided into sections called sectors. A sector is the smallest physical storage unit on the disk. The data size of a sector is always a power of two
CYLINDER-consists of the set of tracks that are at the same head position on the disk
SEEK TIME- the amount of time required for the read/write heads to the cylinder containing desired sector.
ACCESS TIME-(seek time+latency)
total time it takes the computer to read data from a storage device such as computer memory....
ROTATIONAL DELAY/LATENCY-is the time to move the required sector to the disk head