CompTIA Network+ : Domain 5.0 (5.1-5.5)

Which tool forces the wires into the slots on a 66 or 110 block?

A punchdown tool

What tool is used to locate the signal generated by a tone generator at the other end of the cable?

A tone locator

Which special type of connector is used while testing a network interface card?

A hardware loopback

What is another term used for attenuation?

decibel (Db) loss

Which TCP/IP utility displays the current protocol statistics and port connections?

Netstat

What do objects that act as reflectors of a wireless signal cause?

Multipath distortion

What is crosstalk?

A specialized type of EMI caused by parallel runs of twisted-pair cables

What method can a hacker use to determine which TCP ports are open on a private network?

Port scanning

Which tool is used to determine the category of a cable?

A cable certifier

What device is used to trace a cable by means of connecting an alligator clip to one end and touching the other end with a proble?

A tone generator

Which special type of cable can you use to check communications between two workstations?

A crossover cable

Which Ethernet transmission mode is more susceptible to collisions: full duplex or half duplex?

Half duplex

What is LWAPP?

a protocol that allows a wireless LAN controller (WAC) to manage and control multiple wireless access points

What specific actions do you perform during the second step in the Network+ troubleshooting strategy?

To establish a theory of probable cause:

Question the obvious

Consider multiple approaches

Divide and conquer

How does full-duplex mode aff

Traffic can be transmitted in both directions at the same time

Which type of antenna transmits in a defined radius from the antenna placement?

Omni-directional antenna

Which type of cable is immune to electrical interference from radio frequency interference (RFI) abd EMI?

Fiber optic cable

Which tool is used to terminate twisted-pair wires on a patch panel?

A punchdown tool

What occurs when two copper connectors touch each other?

A short, which diverts the current due to lower resistance

What term is used to describe the situation where a wireless AP has reached the maximum number of connected devices?

Device saturation

What is the term for the 12-digit hexadecimal address assigned to a network card by its manufacturer?

A MAC address

What is a Network mapper (nmap)?

A security scanner that discovers hosts and services on a computer network, thus creating a map of the network

Which utility allows you to query a name server to find out which IP address corresponds to a particular domain name?

nslookup

Which tool do you use to check the physical condition of a cable to determine if there are excess collisions and congestion errors on a network?

An advanced cable tester

What does a Wi-Fi analyzer do?

Analyzes the signal strength of your wireless APs

Which device is used to determine where a break has occurred in a network cable?

A Time Domain Reflectometer (TDR)

What is refraction?

Bending of waves as they pass from one medium to another, due to a change in their speed

What is the purpose of a throughput tester?

To verify a network's transmission speed

What tool checks for open circuits and short circuits on our network and typically includes an electric current source, a volt meter, and an interface connecting to the cable?

A cable tester

What specific step do you perform during the third step in Network+ troubleshooting strategy?

When testing a theory to determine to cause:

-If the theory is confirmed, determine the next steps to resolve the problem

-If the theory is not confirmed, reestablish a new theory or escalate

Which device can you use to determine the length of a network cable?

A TDR

Which utility do you use to display a list of local IP addresses resolved to physical addresses on a Microsoft Windows network?

The ARP utility

What can a hacker use to defeat a MAC address filter?

A packet sniffer

What device or tool is used to identify a single cable on the network?

A toner probe

What device or tool can be used to determine the length of cables used on a fiber optic network?

An Optical Time Domain Reflectometer (OTDR)

Which tool is used to attach a connector to the end of a cable by means of pressing metal contacts into the inner conductors?

A wire crimper

Which utility displays the following line as output:

Reply from 210.98.102.3: bytes=32 time< 10ms TTL = 128

ping

What term is used to describe the situation where a wireless network has urn out of bandwidth for the devices connected to it?

Bandwidth saturation

What measures the ability of the cable to resist crosstalk?

Near-end crosstalk (NEXT)

What is the term used to describe the loss of signal strength as data travels over a network cable?

Attenuation

What condition is indicated by a small amber colored LED that stays continuously lit on a hub?

Excessive network collisions

Which TCP/IP utility do you use when you want to determine the route a packet takes to reach a remote system?

tracert

How could you deploy two wireless APs in close proximity?

Either configure them to use different channels or decrease their signal strength so that the area of coverage does not overlap

What is the Unix/Linux equivalent to the tracert command?

traceroute

What two possible situations does an unsuccessful ping of 127.0.0.1 indicate?

That TCP/IP is not properly installed on the local device, or that the local interface is not functioning

What tool should you use to attach a connector to each end of a cable and create a patch cable?

A wire crimper

What device or tool is used to test the voltage and current for power sources?

A multimeter

How does half-duplex mode affect traffic?

Devices can only transmit or receive at any one time.

Which type of antenna only transmits in a single direction?

Unidirectional antenna

Which TCP/IP utility is used to view a list of IP addresses and the MAC addresses to which they are resolved?

arp

What occurs when the cabling connectors are configured with the wrong individual pin in the connector sockets?

Incorrect termination

Which TCP/IP utility displays protocol statistics and connections using NetBIOS?

nbtstat

What specific actions do you perform during the first step in the Network+ troubleshooting strategy?

To identify the problem you should:

-Gather information

-Question users

-Identify symptoms

-Determine if anything has changed

-Duplicate the problem, if possible

-Approach multiple problems individually

How does wireless jamming work?

By denying service to authorized users as legitimate traffic is jammed by the overwhelming frequencies of illegitimate traffic

What device or tool is used to test telephone lines?

A butt set

Which tool will help you input a test signal that can be traced through the cable?

A tone generator

What is the first step in troubleshooting a network problem according to CompTIA?

To identify the problem

Which TCP/IP utility is used to test a connection from a workstation to a server?

ping

In addition to entering ping 127.0.0.1, which other command can you use to test the local TCP/IP interface?

ping localhost

When a computer has access to several different wireless networks, how do you ensure that the computer connects to a specific one?

Set the wireless network you want the computer to use as the preferred network

What should you use to determine if an SFP or GBIC have failed?

An LC loopback tester

Which Linux utility assigns an IP address to a network interface?

ifconfig

What is the UNIX/Linux equivalent to the nslookup command?

dig

Which TCP/IP utility do you use to display the current IP configuration of a Windows computer?

ipconfig

What occurs when there is a break or improper termination in the cabling that prevents the current from flowing through a circuit?

An open or short

What should you do to automatically propagate VLAN information to all switches on the LAN?

Use VLAN Trunking Protocol (VTP)

When does a switching loop occur?

When there is more than one Layer 2 path between two endpoints

Which type of network interface is caused by fluorescent lighting?

EMI

Which device can be used to test for short circuits and breaks in wires?

A multimeter

What measures interference between two pairs of a cable measured at the other end of the cable with respect to the interfering transmitter?

Far End Crosstalk (FEXT)

According to the general troubleshooting model, what should you do after establishing the symptoms of a problem?

You should identify the affected area

What are the seven steps to the troubleshooting strategy as detailed in the Network+ exam guide from CompTIA?

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, and outcomes

A network is running slow. To determine why the administrator wants detailed properties for the cable run, including how much attenuation, crosstalk, noise, and resistance are on it. What tool should the administrator use to get all of this information?

A cable tester

An administrator measures the resistance between the two ends of a cable and verifies that the cable has a break. What tool allows the admin to test the cable in this manner?

A multimeter

An organization hired a new network tech who discovered that none of the previous techs has labeled the cabling in the organization's headquarters building. What tool can the technician use to locate the ends of each cable for labeling?

Network tone generator

An admin suspects there is too much jitter on a network's backbone. What method can the admin use to identify which device is experiencing issues?

LED status indicators

An employee's desktop is not communicating on the network. The network technician verified that the network interface card is functioning correctly and wants to check the switchport to make sure it is also functioning. The switch is in another room and no network diagram shows which switchport the technician should check. What tool can a technician use to find the other end of the cable plugged into the switch?

Network tone generator

An installer is cabling a new building and is laying cable in every area of the building that may need a computer or telephone. What kind of cable is the installer laying?

UTP

Computers connected to a network in a new building are experiencing slow network speeds. An admin is troubleshooting the issue and sees that the new building uses the Plenum space for the ethernet cable runs. How could this cause slow networks speeds?

By causing interference

A server has stopped communicating on the network, and the administrator suspects the network interface card (NIC) or the switch port may be bad. What tools can the administrator use to verify?

Loopback adapter and LED status indicators

An admin connected both a router and a gateway that had dissimilar media types. What kind of issue does this solution remedy?

Transceiver issues

An administrator manually configured a server's network interface card settings to run at 100Mbps and connected the server to the switch. However, communications between the server and other hosts on the network were extremely slow. When the admin checked the light on the server's switch port, it was blinking amber. What kind of issued does this indicate?

A duplexing issue

Although fiber optic cable does not suffer from attenuation in the same way as copper cable, there will still be some loss of signal strength from one end of the connection to the other. What can contribute to signal loss in fiber?

Dirty optical cables, incorrect transceivers, and mismatched coupled cables

A cable installer is testing fiber optic cable for spectral attenuation with the goal of ensuring that each channel has enough power to support wavelength division multiplexing. What tool is the cable installer using?

Optical Spectrum Analyzer (OSA)

A cable installer is using a special tool to affix an RJ-45 connector to an Ethernet cable. What tool has this purpose?

A cable crimper

An organization needs to monitor the network with a packet sniffer. The network is using gigabit Ethernet over copper wire so the frames will also need signal regeneration. What device can the organization use to accomplish both the network monitoring and signal regeneration?

A TAP

Which tools can verify whether a NIC or a switch or router port may be bad?

A loopback adapter and LED status indicators

How is the loss of signal strength expressed?

Decibels

An admin is configuring a router from their laptop through a pale blue cable. What kind of cable is this?

Console cable

An organization's data center has a raised floor that allows all cables from the servers to run under the floor to the switches. What kind of cabling is the data center using?

Plenum cable

An organization is planning to use PoE to supply power to the wireless APs spread throughout the building. What is the best cabling solution to support PoE?

Cat 3 cable or better and shielded cabling

Data travels across the network for a period of time and encounters many types of interference and errors on the first two network layers. What is the data received at the destination and measured at the network or transport layers known as?

Throughput

What command visualizes the general NetFlow data on the command line?

show ip cache flow

What is a device designed to filter and transfer data packets between dissimilar types of computer networks called?

Router

The 802.11n wireless network is experiencing a significant amount of latency. The iperf utility determines that the wireless network is experiencing a significant number of packets arriving out of order, arriving late, and being completely lost. What should be done?

Try using a different channel on the WAP to reduce interference from other 2.4 GHz devices .

A network admin is setting up new address pools on a DHCP server and is having difficulty remembering available IP addresses. What would make the management of allocated IP addresses on the network easier?

An IPAM service

Which command-line command in MS Windows is used to display the contents of a routing table?

route print

Users in an organization report that email is not working properly. An IT engineer uses a command with the set type argument to check for valid email servers and discovers that inbound delivery is a problem. Which utility the engineer uses to troubleshoot the issue?

nslookup

A systems admin is unable to ping remote hosts from a Debian server. Remote hosts can ping the server. The admin troubleshoots the issue by examining the OUTPUT chain. Determine which tool meets the admin's needs to troubleshoot the issue.

iptables

All telnet operations are sent as?

8 bits