Hardware and Network Troubleshooting: Given a scenario, troubleshoot wired and wireless networks with appropriate tools

Question 1

If a user is issued an APIPA, what most likely caused this?

Answer 1

The DHCP server is down

Question 2

What command would you use to view a server’s DNS entry on the DNS server?

Answer 2

nslookup

Question 3

What two ipconfig commands will ensure a network computer receives a new IP address and replaces the old one?

Answer 3

• ipconfig /release

- ipconfig /renew

Question 4

What’s the first tool you should use when diagnosing complaints that a user can’t access a company’s website?

Answer 4

ping

This tool can be used to test the connection between two computers

Question 5

The ______ is the IP address of the router that forwards the data

Answer 5

Default gateway

Question 6

Workstations read entries in their _______ files before making requests to DNS

Answer 6

HOSTS

Question 7

What command allows you to view open ports on a computer?

Answer 7

netstat

Question 8

What switch will allow you to continuously send pings until stopped with the break command?

Answer 8

-t

Question 9

What tool would you use to trace a network cable back to the central wiring closet?

Answer 9

A tone generator

Question 10

You can NOT access a website using it’s FQDN (fully qualified domain name), but you can using its IP address. This indicates what?

Answer 10

The DNS (domain name server) is down

Question 11

An IP address of 169.254.184.25 with a subnet mask of 255.255.0.0 is what?

Answer 11

APIPA (Automatic private IP addressing)

The subnet mask for an APIPA is always 255.255.0.0

Question 12

This command will display the path that data travels through a network, beginning at the host, and ending at the specified computer name or IP address

Answer 12

tracert

Question 13

If your computer is assigned the wrong _____, it will be able to communicate with other computers on the same network, but not with computers on other networks

Answer 13

Default gateway

Question 14

The _____ will allow display the IP address for your local windows computer

Answer 14

ipconfig

Question 15

After replacing a laptop wireless network card, what is the first thing you should do after connecting the internal antenna cables and rebooting the computer?

Answer 15

Install the latest drivers for the wireless card

Question 16

If a computer could connect to a network yesterday, but not today, you should start by using the ___ command

Answer 16

ipconfig

The most likely cause is incorrect TCP/IP configuration, which will be displayed using the ipconfig command

Question 17

The ipconfig ______ switch lists all the TCP/IP configuration parameters for the computer on which it is run

Answer 17

ipconfig /all

Question 18

The _____ command tests connectivity to a remote host

Answer 18

Ping

Question 19

The ____ command displays network configuration settings for the local computer

Answer 19

ipconfig

Question 20

The _____ command verifies entries on a DNS server

Answer 20

nslookup

Question 21

The ____ command diagnoses problems with the netBIOS name resolution

Answer 21

nbtstat

Question 22

The most likely cause of most connectivity issues is to check the _______

Answer 22

Connection

Question 23

If a user can’t connect to a file server on a 100BaseT network, but can connect to folders on other computers, with a single hub on the network, what two hardware problems could be the cause?

Answer 23

• Defective hub port

- Defective NIC in the file server

Question 24

A ______ must be specified for a host to connect to hosts outside the local network, on small networks, this is the address of the router that connects the local network to the internet

Answer 24

Default gateway

Question 25

The ____ command will display the IP address and DNS name of every node that a data packet passes through on its way to a remote computer or location, along with the time required for the data packet to travel through each node

Answer 25

tracert

Question 26

A network administrator has changed the IP address of several servers on the network. A user is now unable to connect to file shares on those servers. What command would you run in this scenario?

Answer 26

ipconfig /flushDNS

This will flush the contents of the client computer’s DNS cache

Question 27

Wireless devices use the 2.4GHz range, which is also used by common devices such as _______ and ______

Answer 27

• Cordless phones

- Microwaves

Question 28

A _____ is used to connect the end of an ethernet cable to an RJ-45 cable

Answer 28

Wire crimper

Question 29

A NIC port has no lights, what are three possible solutions for this issue?

Answer 29

• Check that the switch is on
• Check if the other end of the cable is connected to the switch
• Replace the network cable

Question 30

A TDR (time domain reflectometer) is returning a signal too early. What does this indicate?

Answer 30

There is a break in the network cable, and the cable should be replaced

Question 31

A _____ is responsible for resolving host names to TCP/IP addresses

Answer 31

Domain Name System (DNS)

Question 32

A table of NetBIOS names resolution and registration statistics will be displayed when you issue the ______ command

Answer 32

nbtstat -r