Random Info Flashcards
/dev/
Devices. Where connectionnto all external devices are held
/lib*/
Libraries. Files shared by multiple programs, all symlinks to /usr/lib*
/opt/
Optional. Add I n software not controlled by os
/proc/
Process. Process info is stored here
/usr/
Universal system resource. User utilities and apps.
Symlink
A file that points to another file. Like a windows shortcut. Start with an l.
Find command and its format
Will search for terms in filenames
Find /home/ -name “*.txt”
Find to find only directories or files
-type d. -type f
OSI model
Open systems interconnection model. How packets are broken down and connected on the other side.
Osi model layer 1
Where raw bits treats is physically transferred over the physical medium
Osi level 2
Data link layer. Breaks data into frames for transmission on the physical layer. Defines format of the data
Osi layer 3
Network layer. Traffic routing through interconnected nodes. Route map.
Osi layer 4
Transport layer. Tcp layer. Manages transmission between nodes. That the sequence is accurate and that errors are corrected.
Osi layer 5
Session layer. Includes setup, authentication, termination, and reconnections. Controls ports and sessions
Osi level 6
Presentation layer. Translates network data to application formats. Where encryptionnis located.
Layer 7 osi model
Application layer. Includes protocols for end users. Like http
