Network Tools and Commands Flashcards
Protocol Analyzer
Used to capture and analyze signals and data traffic over a communication channel
Packet Capturing Tool
Captures network packets in real time; like Wireshark
Port Scanner
Determines which ports are open on a network
iPerf
Gathers an active measurement of the maximum achievable bandwidth on an IP-based network
NetFlow Analyzer
Performs monitoring, troubleshooting and in-depth inspection, interpretation, and synthesis of traffic flow data
Trivial File Transfer Protocol (TFTP)
Protocol for exchanging files between two TCP/IP machines
TFTP Server
Used for simple file transfers on a network and boot-loading; mostly configs
IP Scanner
Used to search for and detect IP addresses and other information related to devices on the network; nmap Angry IP Scanner, etc.
What do you do if you don’t have connectivity?
Can you ping 8.8.8.8?
Can you ping default gateway?
Can you ping a local client’s IP address?
Can you ping yourself? Ping 127.0.0.1 (if you can’t, you have a nic or cabling issue)
ip command
Assigns an address to a network interface or configures network interface parameters on a Unix, Linux, or OS X operating system
Nslookup
Used to query the DNS to provide the mapping between domain names and IP addresses or other DNS records
dig
Used to conduct queries against DNS nameservers and is only available for Linux, Unix, and OS X systems by default
hostname
used to display the hostname portion of the full computer name
arp
Used to display and modify entries in the Address Resolution Protocol (or ARP) cache on a system
how do you clear the arp cache?
arp -d
route
used to view and manipulate the IP routing table in a Windows, Linux, Unix or OS X system
nbtstat
Used to view the current connections and statistics for devices communicating using the NetBIOS over TCP/IP protocol
netstat
Displays information for IP-based connections on a client including its current sessions, its source and destination IPs, and port numbers
telnet
Provides a bidirectional interactive text-oriented communication facility using a virtual terminal connection
tcpdump
Allows for the display of TCP/IP and other packets being transmitted or received over a network to the client’s screen
nmap
Discovers hosts and services on a computer network by sending packets and analyzing the responses
show interface
Displays statistics for the network interfaces on the devices
show config
displays the current system configuration on the screen
show route
Displays the current state of the routing table on the device
