Network Tools and Commands

Question 1

Protocol Analyzer

Answer 1

Used to capture and analyze signals and data traffic over a communication channel

Question 2

Packet Capturing Tool

Answer 2

Captures network packets in real time; like Wireshark

Question 3

Port Scanner

Answer 3

Determines which ports are open on a network

Question 4

iPerf

Answer 4

Gathers an active measurement of the maximum achievable bandwidth on an IP-based network

Question 5

NetFlow Analyzer

Answer 5

Performs monitoring, troubleshooting and in-depth inspection, interpretation, and synthesis of traffic flow data

Question 6

Trivial File Transfer Protocol (TFTP)

Answer 6

Protocol for exchanging files between two TCP/IP machines

Question 7

TFTP Server

Answer 7

Used for simple file transfers on a network and boot-loading; mostly configs

Question 8

IP Scanner

Answer 8

Used to search for and detect IP addresses and other information related to devices on the network; nmap Angry IP Scanner, etc.

Question 9

What do you do if you don’t have connectivity?

Answer 9

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)

Question 10

ip command

Answer 10

Assigns an address to a network interface or configures network interface parameters on a Unix, Linux, or OS X operating system

Question 11

Nslookup

Answer 11

Used to query the DNS to provide the mapping between domain names and IP addresses or other DNS records

Question 12

dig

Answer 12

Used to conduct queries against DNS nameservers and is only available for Linux, Unix, and OS X systems by default

Question 13

hostname

Answer 13

used to display the hostname portion of the full computer name

Question 14

arp

Answer 14

Used to display and modify entries in the Address Resolution Protocol (or ARP) cache on a system

Question 15

how do you clear the arp cache?

Answer 15

arp -d

Question 16

route

Answer 16

used to view and manipulate the IP routing table in a Windows, Linux, Unix or OS X system

Question 17

nbtstat

Answer 17

Used to view the current connections and statistics for devices communicating using the NetBIOS over TCP/IP protocol

Question 18

netstat

Answer 18

Displays information for IP-based connections on a client including its current sessions, its source and destination IPs, and port numbers

Question 19

telnet

Answer 19

Provides a bidirectional interactive text-oriented communication facility using a virtual terminal connection

Question 20

tcpdump

Answer 20

Allows for the display of TCP/IP and other packets being transmitted or received over a network to the client’s screen

Question 21

nmap

Answer 21

Discovers hosts and services on a computer network by sending packets and analyzing the responses

Question 22

show interface

Answer 22

Displays statistics for the network interfaces on the devices

Question 23

show config

Answer 23

displays the current system configuration on the screen

Question 24

show route

Answer 24

Displays the current state of the routing table on the device