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Registered (also called buffered) memory modules have a register between the DRAM modules and the system's memory controller. They place less electrical load on the memory controller and allow single systems to remain stable with more memory modules than they would have otherwise.
Conventional memory is usually referred to as unbuffered memory or unregistered memory.
CIDR Notation (Classless Inter-Domain Routing)
192.168.2.1/24 represents the IPv4 address 192.168.2.1 and its associated routing prefix 192.168.2.0, or equivalently, its subnet mask 255.255.255.0, which has 24 leading 1-bits.
ln -s TARGET LINK_NAME
ln - make links between files
-s - Specifies to make a soft link
Wire Crimping
iptables-save > /etc/iptables/iptables.rules
Freebie! Any answer is okay!
top
htop
ps
ip address (ip a)
ifconfig (deprecated)
T-568A
T-568B
A user-space application program that allows a system administrator to configure the tables provided by the Linux kernel firewall and the chains and rules it stores.
Modify date modified of a file.
Fork Bomb
:() means you are defining a function called :
{:|: &} means run the function : and send its output to the : function again and run that in the background.
The ; is a command separator, like &&.
: runs the function the first time.
openssh-server
sshd
lspci
lsusb
Twisting pairs of wires helps mitigate noise and interference from outside sources.
Bourne-Again Shell
IPMI (Intelligent Platform Management Interface)
HP: LightsOut
Dell: DRAC (Dell Remote Access Controller)
iptables -A PREROUTING -d <incoming ip interface>/32 -p tcp -m multiport --dports 22,80,443,6667,3000 -j DNAT --to-destination <to ip address>
iptables -A POSTROUTING -s <to ip address>/32 -o <Interface name> -j SNAT --to-source <incoming ip interface>
arp (being deprecated)
ip neighbor
iptables -A INPUT -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
ping -v4 <IP Address>
nmap <IP Address>
uptime
Change the permission on the "filename":
Owner: Execute Only
Group: Write Only
Others: Write and Execute
(This is a weird permission set... don't actually use this.)
PREROUTING: Packets will enter this chain before a routing decision is made.
INPUT: Packet is going to be locally delivered. It does not have anything to do with processes having an opened socket; local delivery is controlled by the "local-delivery" routing table: ip route show table local.
FORWARD: All packets that have been routed and were not for local delivery will traverse this chain.
OUTPUT: Packets sent from the machine itself will be visiting this chain.
POSTROUTING: Routing decision has been made. Packets enter this chain just before handing them off to the hardware.
What is the process of connecting RJ-45 to CAT cables called?
In the string, "192.168.2.1/24", What does "/24" represent?
What command would you use to save the current ruleset in IPTables?
This famous string ":(){ :|: & };:", is also known as...What is the common wiring standard for ordering the twisted pairs in a RJ-47 connector called?
How do you find the IP address of a computer on Linux?
What does this command do?
`chmod 123 filename`
What command would you use to redirect incoming traffic from port 80 to another machine?
Why are most CAT cables come as twisted pairs?
What tool would you use to figure out processes running on a machine?
What common linux command would you use to find out how long this computer has been on?
What modules to server need to provide out-of-band remote managment?
What command would you use to figure out pci devices connected to your linux computer?
What does BASH mean?
What is a way that you can test to see if you are able to access a computer on a network?
What is the difference between registered and unregistered memory?
What is IPTables?
What common server daemon would you use to administrate a linux computer remotely with?
Freebie: Name your favorite command to use.
What are basic chains that IPTables is usually setup with?
What command would you use to figure out MAC to IP/hostname correlations?
What command would you use to open port 80 on the current machine?
DHCP assigns IP address... but what else can it define?
What is the linux equivalent to making a shortcut to a file in another location?
The common tool "touch" can be used to create a file, however what is the original intent for this tool?
| Description | Match: |
How do you find the IP address of a computer on Linux? | ip address (ip a) ifconfig (deprecated) |
What is a way that you can test to see if you are able to access a computer on a network? | ping -v4 <IP Address> nmap <IP Address> |
In the string, "192.168.2.1/24", What does "/24" represent? | CIDR Notation (Classless Inter-Domain Routing)
192.168.2.1/24 represents the IPv4 address 192.168.2.1 and its associated routing prefix 192.168.2.0, or equivalently, its subnet mask 255.255.255.0, which has 24 leading 1-bits. |
DHCP assigns IP address... but what else can it define? |
|
What command would you use to figure out MAC to IP/hostname correlations? | arp (being deprecated) ip neighbor |
What is IPTables? | A user-space application program that allows a system administrator to configure the tables provided by the Linux kernel firewall and the chains and rules it stores. |
What are basic chains that IPTables is usually setup with? | PREROUTING: Packets will enter this chain before a routing decision is made. INPUT: Packet is going to be locally delivered. It does not have anything to do with processes having an opened socket; local delivery is controlled by the "local-delivery" routing table: ip route show table local. FORWARD: All packets that have been routed and were not for local delivery will traverse this chain. OUTPUT: Packets sent from the machine itself will be visiting this chain. POSTROUTING: Routing decision has been made. Packets enter this chain just before handing them off to the hardware. |
What command would you use to save the current ruleset in IPTables? | iptables-save > /etc/iptables/iptables.rules |
What command would you use to open port 80 on the current machine? | iptables -A INPUT -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT |
What command would you use to redirect incoming traffic from port 80 to another machine? | iptables -A PREROUTING -d <incoming ip interface>/32 -p tcp -m multiport --dports 22,80,443,6667,3000 -j DNAT --to-destination <to ip address>
iptables -A POSTROUTING -s <to ip address>/32 -o <Interface name> -j SNAT --to-source <incoming ip interface> |
What does BASH mean? | Bourne-Again Shell |
| Fork Bomb
The
|
What is the linux equivalent to making a shortcut to a file in another location? | ln -s TARGET LINK_NAME
ln - make links between files
-s - Specifies to make a soft link |
What does this command do?
`chmod 123 filename` | Change the permission on the "filename": Owner: Execute Only Group: Write Only Others: Write and Execute (This is a weird permission set... don't actually use this.) |
The common tool "touch" can be used to create a file, however what is the original intent for this tool? | Modify date modified of a file. |
What is the process of connecting RJ-45 to CAT cables called? | Wire Crimping |
Why are most CAT cables come as twisted pairs? | Twisting pairs of wires helps mitigate noise and interference from outside sources. |
What is the common wiring standard for ordering the twisted pairs in a RJ-47 connector called? | T-568A T-568B |
What is the difference between registered and unregistered memory? | Registered (also called buffered) memory modules have a register between the DRAM modules and the system's memory controller. They place less electrical load on the memory controller and allow single systems to remain stable with more memory modules than they would have otherwise.
Conventional memory is usually referred to as unbuffered memory or unregistered memory. |
What modules to server need to provide out-of-band remote managment? | IPMI (Intelligent Platform Management Interface)
HP: LightsOut Dell: DRAC (Dell Remote Access Controller) |
What tool would you use to figure out processes running on a machine? | top htop ps
|
What common linux command would you use to find out how long this computer has been on? | uptime |
What common server daemon would you use to administrate a linux computer remotely with? | openssh-server sshd |
What command would you use to figure out pci devices connected to your linux computer? | lspci lsusb |
Freebie: Name your favorite command to use. | Freebie! Any answer is okay! |
