CH21 - Course Quiz Flashcards
Which Linux command can be used to view IP settings?
ip
ipconfig
ss
config
ip
Which command, while not available on Windows, can be used on macOS, UNIX, and Linux systems to diagnose DNS problems?
nslookup
ipconfig
ping
dig
dig
Explanation:
Keywords = “…not available on Windows…”
Dig is used on macOS, Linux, UNIX.
nslookup is used on Windows.
A cable might experience crosstalk, where the electrical signal bleeds from one wire pair to another, creating _____________?
interference
voltage spikes
noise
impedance
interference
Which tool tests a cable to ensure that it can handle its rated amount of capacity?
cable tester
certifier
time domain reflectometer
optical time domain reflectometer
certifier
Which tool can be used to identify the location of a cable break in Copper cable?
cable tester
certifier
time domain reflectometer
optical time domain reflectometer
time domain reflectometer
The vast majority of cabling problems occur long after a successful network installation, since when the network has operated unchanged?
True
False
False
Broken cables cause intermitten problems?
True
False
False
When a cable is not broken but it’s not moving data the way it should, turn to a certifier for diagnostics?
True
False
True
Switching loops are rare?
True
False
True
Which tool can be used to identify the location of a cable break in Fiber cable?
cable tester
certifier
time domain reflectometer
optical time domain reflectometer
optical time domain reflectometer
Computers use Address Resolution Protocol (ARP) to resolve IP Addresses to MAC Addresses?
True
False
True
Which software tool is used to trace all of the routers between two points?
portscan
sniffer
nmap
traceroute
traceroute
Which tool is an example of a packet sniffer and protocal analyzer?
Speakeasy
Wireshark
Arp
nmap
Wireshark
Most network techs rely on __________________ as their port scanning tool of choice?
Speakeasy
Wireshark
Arp
Nmap
Nmap
Sometimes a GUI tool like Wireshark won’t work because a server has no GUI installed. In situations like this, __________________ is the go-to choice?
Speakeasy
tcpdump
nmap
Angry IP Scanner
tcpdump
Microsoft has a utility called _________________ that combines the functions of ping and tracert and adds some additional functions?
routeping
pingtrace
traceping
pathping
pathping
Which tool falls into the category of a third-party software tool?
throughput tester
tone generator
netstat
pathping
throughput tester
Improperly configured Routers aren’t going to send packets to the proper destination?
True
False
True
Which command can be used on a Windows computer to view the IP settings?
ip
ss
ipconfig
ifconfig
ipconfig
The traceroute utility is used to trace all of the routers between two points?
True
False
True
Which utility uses Internet Message Control Protocol (ICMP) packets to query by IP or by name?
ping
traceroute
nslookup
mtr
ping
Which tool helps a technician make unshieled twisted pair (UTP) cables?
time domain reflectometer
cable stripper
optical time domain reflectometer
punchdown tool
cable stripper
Which tool intercepts and logs network packets?
certifier
packet sniffer
throughput tester
port scanner
packet sniffer
Which task is the first step in the troubleshooting process?
Establish a theory of probable cause.
Implement and test the solution.
Identify the problem.
Test the theory to determine cause.
Identify the problem.
Multimeters test frequency?
True
False
False (Voltage)
Different Networking jobs require wildly different tools?
True
False
True
Which command is dynamic (Keeps Running) equivalent to traceroute?
mtr
routetrace
route
ping
mtr
Which utilities are excellent examples of connectivity software, applications that enable you to determine if a connection can be made between two computers?
Wireshark and nmap
ping and traceroute
nbstat and netstat
arp and arping
ping and traceroute
Which command would a technician use to diagnose DNS problems on a Windows computer?
nslookup
ipconfig
ping
dig
nslookup
The traceroute command defaults to either IPv4 or IPv6?
True
False
True
When troubleshooting a problem, a technician needs to select the most probable cause from all the possible causes?
True
False
True
Which tool puts UTP wires into a 66- and 110-blocks?
time domain reflectometer
cable stripper
optical time domain reflectometer
punchdown tool
punchdown tool
_______________ enable a technician to measure the data flow in a Network?
Throughput testers
The ________________ utility enables a technician to view and change the ARP Table on a computer?
arp
For command-line tools, type _______________ followed by a command to see the available switches for that command?
help
The netstat utility shows what ___________________ are active and can also provided statistics based on ports or protocols (TCP, UDP, and so on)?
sessions
_____________________ test voltage (both AC and DC), resistance, and continuity and they are also a great fallback for continuity testing when you don’t have a cable tester handy?
Multimeters
In place of the netstat command, the current comamnd to use on Linux computer to view the current state of all your running IP processes is ____________?
ss
To measure the amount of _________________, technicians use an optical power meter?
light loss
A technician can use a ___________________ to monitor server rooms over time to detect and record issues with electrcity?
voltage quality recorder
As a computer learns various MAC addresses on its LAN, it jots them down in the ________________ table?
ARP
A _______________ can be used by hackers to look for unintentional opened ports that might make a system vulnerable to attack?
port scanners
Use the ________________ to force the traceroute command to use IPv6?
-6 flag = Windows
traceroute6 = macOS/Linux
What are two basic rules of troubleshooting (one is similar to the Hippocratic Oath)?
First, do no harm.
Second, always make good backups!
When troubleshooting a computer problem by talking to a user over the telephone, when would open-ended questions (requiring the user to answer in their own words) be most appropriate?
If the user seems to be confused about what is happening.
Compare the nslookup and dig commands?
They help diagnose DNS Problems.
NSLOOKUP = Windows by Default
DIG = macOS/UNIX/Linux
Describe atleast three scenarios that a technician would define as a “Broken” Cable?
Open Circuit - Where one or more of the wires in a cable simply don’t connect from one end of the cable to the other.
Short - Where one or more of the wires in a cable connect to another wire in the cable.
Wire Map Problem - Where one or more of the wires in a cable don’t connect to the proper location on the jack or plug.
Crosstalk - Where the electrical signal bleeds from one wier pair to another creating interference.
Noise - signals usually caused by faulty hardware or poorly crimped jacks.
Impedance Mismatch - is the natural electrical resistance of a cable.
List the seven basic troubleshooting steps?
- Identify the Problem
- Establish a theory of probable cause.
- Test the theory to determine the cause.
- Establish a plan of action to resolve the problem and identify potential effects.
- Implement the solution or escalate as necessary.
- Verify full system functionality and, if applicable, implement preventative measures.
- Document findings, actions, outcomes and lessons learned.
Briefly explain how the ping command functions in IPv6?
You can force ping to use IPv6 with the -6 Flag.
In addition, on macOS/Linux you can use the IPv6 specific ping6 command.
When troubleshooting a computer problem by talking to a user over the telephone, when would close-ended questions (requiring “Yes” or “No” answers” be most appropriate?
When the end user is technically oriented because they know what they’re talking about.
Compare traceroute to mtr?
My Traceroute (MTR) is dynamic and keeps running but is equivalent to traceroute. MTR is a UNIX/Linux Tool with a Windows version called WinMTR.
Explan how documentation fits into troubleshooting scenario?
Actions Taken, Outcomes of your Theories for Learning, Lessons Learned, and basically creating your own FAQ/Quick Reference or updating a KB that you can refer to for common problems encountered.
If a tracert fails with a Windows System, why might traceroute succeed with a Linux/Cisco System?
Windows tracert sends only ICMP Packets while UNIX/Linux traceroute sends UDP datagrams by default, but can also send TCP segments.
So if it fails with a Windows System, it could be because the Router is blocking ICMP Packets, so running it on a Linux system may yield different results.
Describe the “Divide and Conquer” method of tackling multiple options?
It’s a time savor that comes into play as part of developing a theory of probable cause. As you gather information about a problem a general sense of where the problem lies should manifest. So you begin to troubleshoot at the appropriate layer of the OSI model where the problem cause is suspected. If it proves correct, follow that theory. If it is wrong, then move up or down the OSI model till the solution is found.
Explain why it is important spend the money for a good multimeter?
Cheap tools save you money in the beginning, but they often break more readily than higher-quality tools, and more importantly make it harder to get a job done.
Describe three security policy decisions that can be implemented to prevent departmental bandwidth consumption that compromises network operations?
First, setup a throttling policy that defines in terms of megabits per second the max amount of bandwidth any single department can use per day.
Second, add a blocking policy - if anyone goes over this limit, the company will block all traffic of that type for a certain amount of time.
Third, update the company’s fair access policy or utilization limits security policies to reflect these new limits. This lets employees, especially those pesky sales folks know what the new rules are.
