Troubleshooting tools 5.5

Question 1

Protocol analyzer

Answer 1

Gathers frames for analysis

Question 2

nmap

Answer 2

Network mapper, scans ports and identifies open ports, gives OS scans and service scans for ports. Active scan. Layer 2

Question 3

CDP

Answer 3

Proprietary Cisco, discovers network devices

Question 4

LLDP

Answer 4

Vendor neutral, discovers network devices

Question 5

Speed tester

Answer 5

Bandwidth testing. ISP specific or third party

Question 6

ping

Answer 6

Tests if device is reachable. ICMP. Very basic, use all the time

Question 7

traceroute/tracert

Answer 7

Traces route and shows all hops using TTL

Question 8

nslookup

Answer 8

dns lookup, windows and mac. looks up name and ip addresses. deprecated

Question 9

dig

Answer 9

looks up domain name and ip address. use instead of nslookup

Question 10

tcpdump

Answer 10

capture packets and displays or saves in pcap

Question 11

netstat

Answer 11

shows network statistics, shows inbound and outbound connections.

Question 12

ipconfig/ifconfig/ip

Answer 12

shows ip address, subnet mask and gateway. uses modifiers.

Question 13

arp

Answer 13

Determines mac address based on IP address.

Question 14

Toner/Tone generator

Answer 14

Tone generator ends signal down wire that can be picked up by a probe which will sound off. Analogue.

Question 15

Cable tester

Answer 15

Tests cable. Checks if all pairs are good or not.

Question 16

Taps

Answer 16

Tap that copies packets. Active or passive. Hardware or software.

Question 17

Wireless survey tool

Answer 17

Signal coverage, finds wireless strength. Can find interference.

Question 18

Wifi analyzer

Answer 18

Hardware based, views all 802.11 information. Might have spectrum analyzer.

Question 19

Visual fault locator

Answer 19

Fiber optic flashlight. Finds where fiber optic is broken, break will glow slightly.

Question 20

show mac-address-table

Answer 20

shows mac address table on switches

Question 21

show route

Answer 21

view next hops on router

Question 22

show interface

Answer 22

status and information of interface

Question 23

show config

Answer 23

shows config of device

Question 24

show arp

Answer 24

arp cache of system

Question 25

show vlan

Answer 25

show velan associated with switch interface

Question 26

show power

Answer 26

power supply status, PoE usage and power used