Flashcards in Linux Operating System Deck (44):
What is the first process started by Kernal called?
What are processes launched by init called?
where is the init process typically stored?
process ID - lots of processes rely on PID
Parent process id
what is generally used to search for processes?
top and ps
frees memory from processes
ps -u user --forest does what
shows a tree of processes by the user user
ps aux is?
good and adds a user and just makes it look nice? idk 5 this
dynamic libraries and also supports static files needed for the boot process.
also dynamic libraries and support static files for the /usr/bin and /usr/sbin
usually contain teh configuration files for all the programs that run on linux/unix
Where are deamons' config files stored
in a subdir of /etc
7 layers of internet communcation?
literally transmits electrical signals between the hosts. It's the network card connected to a wire
defines rules for accessing physical layer. Specifies how to verify data recieved from the physical layer.
Enables routing of data, spefices how to recognize addresses and the next network point to send a node.
Internet and ICMP operate on this level
sending host's 4 recieves data and divides it into packets. The receiving provides error checking and unpacks packets and assembles the data.
Responsible for establishing and maintaining a connection between two machienes
Ensures information passingthroughout all layers is formatted corretly for 7
provides applications for a way to access networiking
a protocal that ensures data exchanged between two network hosts is exchanged reliably
what two protocals are used with IP
TCP and UDP
ICMP stands for?
Internet Control Message Protocol.
ICMP is used for what?
Testing connections between hosts
what layers are ports accessed at
The 4Transport layer
137 138 139
For well established services
Orgs can apply for a reg port number to be assigned to their service
Available for any use by any network service
usually used for temporarilly establish connections between two applications.
what layer does the MAC address oprate
MAC address is hardcoded on the network board and cannot be changed.
If the last octet in an IP address is 0, what does that mean?
it is the network address. Eg 220.127.116.11. A host cannot use that IP address
what is the last octet of 255 reserved for
Class A private IP range?
10.0.0.0 - 10.255.255.255
Class B private IP range?
172.16.0.0 - 172.31.255.255
Class C private IP range?
192.168.0.0 - 192.168.255.255