Networking Tools & Command Line Flashcards

1
Q

Loopback

A

Connects transmit pins (or fibers) to receive pins (or fibers) to test a network interface.

Ethernet Pinout:
Pins 1 to 3 = Tx+ to Rx+
Pins 2 to 6 = Tx- to Rx-

Fiber:
Transmit fiber to Receive fiber

Used with diagnostic software to test Ethernet connectivity of a client

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2
Q

Cable Certifier

A

Used with existing cable to determine category or test throughput

Identifies frequency range supported by cable to determine throughput

Can be used to determine length of a cable

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3
Q

Butt Set

A

Test equipment tools used by telephone techs to check for dial tone or verify a call can be placed on the line.

Can connect to a punch-down block to connect to telephone line using alligator clips

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4
Q

Throughput Tester

A

Network appliance that typically has multiple network interfaces can generate high volumes of pseudo-random data for wired/wireless networks.

Used on prototype networks to observe performance under heavy load

Used on production networks to determine throughput of existing network

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5
Q

BERT

A

Bit-Error Rate Tester:
Generates patterns at one end of a link & analyzes the received patterns for errors.

BER is a common measurement for network testing
BER = Bit errors/Bits Transferred

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6
Q

Protocol Analyzer/Network Sniffer

A

Traffic can be captured from the network & reviewed for problems in the communication between devices

Standalone device or software
(Wireshark, Ethereal)

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7
Q

Looking Glass Sites

A

Allows users to connect to view the routing info from a server’s perspective

Useful with BGP router configuration

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8
Q

Windows CMD & Bash: arp

A

Shows MAC address for a known IP address

arp -a
Displays current ARP table on computer

arp -d 192.168.1.1
Deletes ARP mapping for specified IP

arp -s 192.168.1.1 00-AA-BB-4F-5C-23
Adds static ARP entry to force IP to resolve to MAC provided

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9
Q

Windows CMD: Ping

A

Checks IP connectivity between devices

ping www.diontraining.com
Stops pinging after 4 pings

ping -n 10 www.diontraining.com
Ping 10 times, then stop

Ping -t www.google.com
Ping forever (until CTRL+C)

Ping -6 www.google.com
Ping using IPv6

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10
Q

Windows CMD: nbtstat

A

Displays NetBIOS info for IP-based networks
Displays a listing of NetBIOS device names learned by the PC

nbtstat -a
Displays the NetBIOS table of the remote PC provided

nbtstat -c
Displays PC’s NetBIOS name cache on local computer

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11
Q

Windows CMD & Bash: netstat

A

netstat -a
Displays all connections & listening ports

netstat -n
Displays addresses & port numbers in numerical form

netstat -s
Displays stats for connections by protocol type
(IPv4, IPv6, TCP, UDP, ICMP)

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12
Q

Windows CMD: route

A

Used to change or display contents of PC’s IP routing table

route print
Displays contents of the IP routing table

route delete 192.168.1.1
Deletes entry from routing table

route add 192.168.1.1 192.168.2.1
Adds routing from first IP to second IP

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13
Q

Bash: ifconfig & ip

A

Same as ipconfig in Windows

ifconfig -a (Provides additional info)
ifconfig down = turn off NIC
ifconfig up = turn on NIC

ip
Assigns an address to a network interface or configures network interface
parameters

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14
Q

Bash: ping

A

Similar to Windows, runs forever by default

ping -c 10 www.google.com
Pings 10 times, then stops

ping -6 www.google.com
Ping using IPv6

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15
Q

Bash: nslookup & host

A

nslookup = Same as Windows

host www.google.com
Works like nslookup, except only provides a single line response with the address

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16
Q

Bash: Dig

A

Resolves a FQDN to an IP address
More info than nslookup
No interactive mode

Dig -t mx google.com
Looks up mail records (mx) for google.com

17
Q

Bash: route

A

Used to change/display contents of PC’s current IP routing table

route
Displays contents of IP routing table

route -n
Displays the content of IP routing table, including default gateway

18
Q

Packet Capturing

A

Used to capture packets running over a network connection in real time
and then save them for later analysis

Ex: SolarWinds, Ethereal, Netasyst, tcpdump, WinDump

19
Q

Bandwidth Speed Test

A

Verifies the real-world throughput from a client device all the way out to the Internet and back

20
Q

Port Scanner

A

Determines which ports are open on a network

21
Q

iPerf

A

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

22
Q

NetFlow Analyzer

A

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

23
Q

IP Scanner

A

Used to search for and detect IP addresses and other information related to devices on the network

24
Q

hostname Command

A

Used to display the hostname portion of the full computer name for a given system

25
Q

tcpdump Command

A

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

26
Q

nmap Command (Network Mapper)

A

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

27
Q

Network Platform Commands: Show Interface

A

Displays statistics for the network interfaces on the device

Cisco: show interface
Juniper: show interfaces
PoE+ Sidewinder: cf interface

28
Q

Network Platform Commands: Show Config

A

Displays the current system configuration on the screen

Cisco: show config
Juniper: show configuration
PoE+ Sidewinder: cf config

29
Q

Network Platform Commands: Show Route

A

Displays the current state of the routing table on the device

Cisco: show route
Juniper: show route
PoE+ Sidewinder: cf route status