US Army Brighton School Pre-Test Quizlets

127 flashcards

TCP

Transmission Control Protocol: connection oriented, requires two ends of communication

UDP

User Datagram Protocol: less secure, faster connection, uses any kind of connection

IP

Internet Protocol

Handshake

A three way method SYN-SYN ACK- ACK

DNS

Domain Name System

NIC

Network Interface Card allows a computer to connect to the internet or network

LAN

Local Area Network

WAN

Wide Area Network

DHCP

Dynamic Host Configuration Protocol: Network protocol automatically assigns IP addresses

DDoS

Distributed Denial of Service: overloads the target with many requests

Brute Force Password Attack

Dictionary attack

Name the different ports

1. SSH (22) 2. telnet (23) 3. SMTP (25) 4. DNS (53) 5. HTTP (80) 6. HTTPS (443) 7. SMB (443, 139,138,137)

SSH

Secure Shell (22)

telnet

Teletype network (23)

SMTP

Simple Mail Transfer Protocol (25)

DNS

Domain Name System (53)

HTTP

Hypertext Transfer Protocol (80)

HTTPS

Hypertext Transfer Protocol Secure (443)

SMB

Server Message Block (443, 139, 138, 137)

PHYSICAL

LAYER 1

DATA LINK

LAYER 2

NETWORK

LAYER3

TRANSPORT

LAYER4

SESSION

LAYER5

PRESENTATION

LAYER6

APPLICATION

LAYER7

Different Router Speeds

2.4, 5, 6GHz

IP address

Internet Protocol Address: Public and Private assigned by router

IP classes

A - E & 1-255 (anything above E & 255 is not IP)

IP A class

Large Networks (1-127)

IP B class

Medium to Large Networks (128-191)

IP C class

Small LANs (192-223)

IP D class

Audio/Video streaming (224-239)

IP E class

Research (240-255)

PING

sends and ICMP Echos Request to a node and listens for an ICMP Echo Reply

PING

The ping command tests the reachability of network devices by sending ICMP echo request packets to a target device

ifconfig

used to display a network interface (common to find IP address)

iwconfig

Similar to ifconfig but works for wireless interfaces only

tcpdump

A command line utility that allows you to capture and analyze network traffic going through your system

arp -a

manipulates the systems ARP cache. ARP cache is a collection of entries that map IP addresses to their corresponding MAC address. Allows you to see all other devices actively connected to this network.

sudo

become super user root giving you permission to access or create differing things, sometimes requires yours or designated persons password

sudo ifconfig eth0 down

shuts down network so you can (sudo macchanger -r eth0) change the mac address and IP address of your or targets IP address

systemctl (start-stop-enable-disable)

Start, stop, enable, disable, and view the status of services for SSH entry

nano

allows user to edit, view, or add to exiting files

Passively monitoring requires what besides a NIC to work?

Alfa Card

Steps in Wireless Surveying

1. hook up alpha card 2. (sudo ifconfig ((interface)) up) 3. change mac address (sudo macchanger -r ((interface)) 4. sudo airmon-ng check kill 5. sudo airmon-ng start (interface) 6. sudo airodump-ng (interface) >> ~/Absolute/Path

what is an interface

examples (wlan0, eth0) ways of connecting to a network

steps to change MAC address

1. Stop your network manager. $ sudo service network-manager stop. 2. Take down the targeted network interface. $ ifconfig wlp2s0b1 down. 3. change your MAC address. $ sudo macchanger -r (interface) 4. Change MAC Address in Linux. 5. Restart your network manager and the associated network interface. (sudo ifconfig (interface) up

3 different categories in systems and permissions (system managers)

user, group, other (guests)

What is NMAP

a port scanner that can search for host on a network identify OS running, and detect the version of the services running in open ports.

how to SCP files/info to your device

scp /path/to/local/file your_username@your_IPaddress: /path/to/remote/destination

order of systems and permissions left to right

user, group, other (guests) rwxrwxrwx (read4, write2, execute1)

command to change permissions of user/group/guest

chmod (sudo chmod 777 My_File.txt)

sudo stands for what

super user-do (assumes highest order of authority)

chown

modifies file ownership and group

chmod

modifies file mode bits (rwxrwxrwx)

usermod

modify a user account, including permissions, change what group you belong to

passwd

change user password

what command changes users password

sudo passwd

what command changes users

su

what command displays file system status

stat

what command lists everything in the current directory

ls (ls -a shows all public and hidden directories)

what command shows all users logged on

who

what command shows which user is currently logged on and using the system

whoami

what command shows the current working directory?

pwd

what command changes directories

cd (./../direct_path)

what command kills loops or frozen terminals

ctrl + c

what command represents "all" when searching for something

*

what command prints the system information youre working on?

uname (use -a to show current version of the system for exploitation purposes)

what command opens is used to open/view files?

cat

what command is used to add text to an existing file?

echo

what command is used to create a new file?

touch

1 > does what to a file?

replaces all contents within an existing file

2 >'s does what to a file?

adds text to existing file (sudo echo "hello this is echo" >> example.txt

what command removes and unlinks files/directories?

rm

what command returns the hash of the destination file for integrity purposes?

shasum -a 256

what does the command grep do?

search with regular expression for words/phrases that are exact matches

what command is used to word count a file

wc (example: wc [file])

what does the command | tee do?

reads from a standard input and writes to a standard output and files

what command is used to create a directory?

mkdir

the command shred does what?

overwrites a file to hide its contents and optionally deletes it

what command copies files and directories?

cp

what command moves and rename files?

mv (always use the absolute path and give desired file name)

the command "head" does what

reads the first part of a file contents

the command tail does what?

reads the last part of a file contents

the command "find" does what?

searches for files in a directory hierarchy

what command shows all previous commands in list format?

history

"SHABANG"

#!/bin/bash

user home directory

~

make new directory

mkdir

change directory

cd

move

mv

copy

cp

print full path of current directory

pwd

create empty file

touch

display contents

cat

root privilege

sudo

previous commands

history

cd 1 level above

cd ..

delete directory and contents

rm -f

delete file

rm (filename)

root directory

/

update repository list

sudo apt update

display user and group info

whoami

edit file

nano

system config files directory

/etc

directory deletes file after reboot/shutdown

/tmp

apend "hello world"

>>

clear screen

clear

apt update _ _ apt upgrade

&&

install net-tools in repository

sudo apt install net-tool

delete directory within directory

rmdir (name)

copy file directory into directory

cp ~/directory/filename ~/directory.

rename file

mv file1 file 2

move to home directory

cd

list all files in current directory include hidden human readable

ls -ahl

print "test" with no new line

echo -n

search for word in file

grep (word) (file)

create file with content

echo (content) > filename

show UID GID and groups

id

show ip in brief format

ip -br a

open file in nano editor

nano (filename)

check ssh service status

systemctl status ssh

list mod time

ls -lt

create two directories

mkdir -p name/name

remove empty directory

rmdir (name)

calendar

cal