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CompTIA Network+(N10-009) > S23-Troubleshooting Tools > Flashcards

S23-Troubleshooting Tools Flashcards

(91 cards)

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1
Q

Cable Certifier

A

a device used to test and verify the performance of installed network cabling

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2
Q

Cable Certifier test parameters

A

wire mapping:
- Ensuring correct wiring and no
shorts or opens.

Cable Length:
- Checking that the cable length is within the allowed limits.

Signal Propagation & attenuation:
- Measuring how well the signal travels through the cable and how much signal strength is lost.

Crosstalk:
- Measuring the unwanted interference between different wires in the cable.

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3
Q

Open pairs

A

indicates a break or interruption in the electrical continuity

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4
Q

Shorted Pairs & shorts between pairs

A

occurs when two conductors within the cable (usually a twisted pair) are touching each other, creating an unintended electrical path.

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5
Q

Reversed Pairs

A

two wires within a single twisted pair are connected to the opposite pins at the other end of the cable

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6
Q

Crossed Pairs

A

wires within a twisted pair are connected to pins of a different pair at the other end of the cable.

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7
Q

Split Pairs

A

A wire from one pair is incorrectly twisted with a wire from another pair leading to crosstalk and interference

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8
Q

Loopback Plugs

A

verify the functionality of a port or device by creating a closed loop where outgoing signals are redirected back to the receiving portion of the same interface

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9
Q

Time Domain Reflectometer (TDR)

A

tool used to characterize and locate faults in electrical lines by analyzing the reflected pulses generated by impedance changes

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10
Q

Optical time-domain Reflectometer (OTDR)

A

characterize and troubleshoot fiber optic cables by analyzing backscattered light

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11
Q

What type of fiber light meter do you need for a multi-mode optical cable?

A

LED-Based

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12
Q

What type of fiber light meter do you need for a single mode optical cable?

A

Laser-Based

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13
Q

Fiber Light Meter/ Optical power meter (OPM)

A

a device used to measure the power of light signals transmitted through fiber optic cables

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14
Q

Fusion Splicer

A

Used to join 2 fibers together

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15
Q

Traffic Access Point (TAP)

A

creates a copy of the network traffic and sends it to a monitoring or analysis tool.

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16
Q

Spectrum Analyzers

A

used to visualize and analyze the spectral content of a signal, essentially providing a “frequency fingerprint”

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17
Q

Wireless Analyzer

A

Software tool that is used to ensure proper coverage and prevent problematic overlap between WAP coverage zones & channels

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18
Q

Protocol Analyzer

A

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

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19
Q

Packet Capturing Tool

A

Captures packets running over a network connection in real time and save for later analysis

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20
Q

what are some Packet capture and Protocol analyzer tools ?

A

Protocol Analyzers
- Ethereal
- Protocol Expert
- Netasyst
- Network Analyzer
- Observer
- LanHound
- EtherPeek

Packet sniffer/capture:
- tcpdump
- WinDump
- PRTG Network Monitor
- SolarWinds
- NetworkMiner
- WireShark

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21
Q

Bandwidth Speed Testers

A

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

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22
Q

What are some Bandwidth Speed testers?

A

Internet Speed testers:
-Speedtest.net
LAN speed testers
- Helios LanTest
- LAN speed test

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23
Q

Port Scanner

A

Determines which ports are open on a network

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24
Q

NetFlow Analyzer

A

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

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25
IP Scanner
Detects IP addresses and other information related to devices on the network
26
IP Scanner examples
- Nmap - Free IP scanner - IP Address manager - PRTG Network Monitor - Angry IP Scanner
27
IPCONFIG
- Displays TCP/IP network config values - refresh DHCP & DNS settings for a Windows Client/server
28
How do you release your current IP address using IPconfig?
ipconfig /release
29
How do you attempt to get a new DHCP address using ipconfig?
ipconfig /renew
30
Command to display more info in ipconfig
ipconfig /all
31
Interface Config (ifconfig)
command line tool for Unix, Linux and OS X systems to display IP address info (Deprecated replaced by Ip cmmand)
32
ifconfig displays?
Status of the currently active interfaces
33
ifconfig en0
displays a single interface
34
ifconfig -a
displays all available interfaces
35
ifconfig down
shut down a network interface
36
ifconfig up
activate a network inferface
37
ifconfig -v
displays more verbose information on an interface
38
ip
Assigns and address to a network interface or configures network interface parameters on a UNIX, Linux, or OS X operating system
39
ip a
displays config of interfaces
40
Assign a static ip to an interface using ip command
ip a add 192.222.1.123 dev eth0
41
Remove an assigned static ip using ip command
ip a del 192.222.1.123 dev eth0
42
change a mac address on an interface using ip command
ip link set dev eth0 address (mac address)
43
Set a network card to operate in promiscuous mode using ip command
ip link set dev eth0 promisc on
44
What is Promiscuous mode on a nic card?
Mode that allows the network card to listen to all traffic on a network
45
ip link set eth0 down/up
activate or deactivate an interface
46
Ping
checks connectivity between two devices
47
Ping -n
Ping a destination a specified number of times for windows
48
ping -t
ping a destination indefinitely
49
T/F ping sends 4 pings by default on Linux, Unix, and OS x clients
False, ping send 4 requests be default for windows for Linux, Unix and OS X its indefinite by default
50
Ping -c
Ping a destination a specified number of times for Linux, Unix and OS X
51
How to break a continuous ping command on any OS?
Ctrl + C
52
ping -6
ping over IPv6
53
traceroute/tracert
Displays the path between device and its destination, showing the source and destination IP address for each hop along the way. - tracet (windows) - traceroute (Linux,Unix, OSX)
54
Name Server Lookup (nslookup)
queries DNS to provide the mapping between domain names and ip addresses or other DNS records
55
Non-Interactive Mode
Displays just the name and the requested information for a host or domain name
56
Interactive Mode
Allows a user to query name servers for information about various hosts and domains
57
How do you enter interactive mode in Nslookup?
type nslookup then press enter
58
How do you change the DNS server being used in nslookup?
type "Server" then the DNS server's name/Ip address then hit Enter
59
Change the type of record to search for in nslookup
Set q = (record type) set type = (record type) - for Linux, Unix, OSX
60
dig
conducts queries against DNS name servers, and is only available for Linux, Unix, and OSX by default
61
hostname
Displays the hostname portion of the full computer name for a given system
62
Address Resolution Protocol (arp)
Used to display and modify entries in the arp cache on a given system
63
View ARP cache
arp -a
64
Delete an IP from an Arp table
arp -d (Ip address)
65
Statically assign a mapping between and Ip address and a Mac address
arp -s
66
How can static arp entries be useful
help set up device entries before they connect to a layer 3 switch or prevent timeouts
67
How long until an arp entry is deleted from the cache?
by default, an arp entry is deleted after 21,600 sec/ 6hrs
68
Clear an entire arp cache
arp -d
69
netstat
used to display information for IP based connections on a client (local address, Foreign address, ports, and states)
70
netstat -a
shows all port sockets both listening and non listening, as well as all protocols
71
netstat -n
shows only ip address numbers instead of hostnames
72
netstat -an
displays ip address numbers and listening status
73
netstat -ano
displays all listening states, ip address numbers and Process identification number (PID) - (-o) shows the process that owns each connection
74
netstat -s
Displays stats for the IPv4, IPv6, ICMPv4 and ICMPv6 connections
75
when can netstat -s be useful
when trying to determine the health of a network connection
76
tcpdump
Text based packet capture tool. dumps network traffic on to the screen, and can also be directed to a file
77
T/F tcpdump is on all Os's by default
False, tcpdump is on Linux, Unix, and OSX by default not windows
78
tcpdump -w
redirects network traffic information to a PCAP file
79
what is a PCAP file
Packet capture file where network traffic data is stored for analysis
80
Network Mapper (Nmap)
used to discover hosts and services on a computer network by sending packets and analyzing the response it received
81
Network Platform
Refers to nay router, Switch, or firewall
82
Show interface (cisco)
displays the stats for a network interface on the device
83
show config (cisco)
displays the current system configuration
84
show route (Cisco)
displays the current state of the routing table on the device
85
show power (Cisco)
Displays and configures power settings
86
show vlan (Cisco)
Displays VLAN settings on a given switch
87
show arp (Cisco)
Displays the ARP table inside a device
88
show mac address-table (Cisco)
displays the MAC address table on a Cisco switch
89
What are some Discovery Protocols?
Link Layer Discovery Protocol (LLDP) Cisco Discovery Protocol (CD)
90
Link Layer Discovery Protocol (LLDP)
a network protocol that allows devices to advertise their capabilities, identity, and neighbors to each other on a local area network (LAN)
91
Cisco Discovery Protocol (CD)
a proprietary Layer 2 protocol developed by Cisco that allows Cisco devices to share information about each other

CompTIA Network+(N10-009) (26 decks)

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