CompTIA Network+ N10-007 Cert Guide
Chapter 14 Network Troubleshooting
1) Out of these three steps in the diagram, the majority of a troubleshooter’s efforts are spent in
which step?
A) Problem report
B) Problem diagnosis
C) Problem resolution
2) The physical layer of the OSI model is not foundational to any of the other layers. True or
False?
3) ________ can occur when an analog connection creates an electromagnetic field around its
conductors, inducing its waveforms on a nearby analog connection.
A) Distance limitations
B) Transposed leads
C) Crosstalk
D) Bad cable placement
4) Consider the network diagram presented here. Let’s assume that both switches are capable of
autonegotiating Ethernet speeds of 10, 100, and 1000 Mbps. Let’s also assume the switches do
not support MDIX. Identify what the Layer 1 issue would be in this topology.
A) This network topology is fine and should work with no problems.
B) No communication is possible between Client A and Server 1.
C) The Ethernet switches are not connected to the redundant power source.
D) Switch R1 is not modular so it’s not allowing the flexibility to connect to the GBIC.
5) Look at the topology provided in the diagram. What is the design issue with this wireless
network?
A) The channels being used interfere with one another.
B) The 10 percent to 15 percent coverage overlap is too large.
C) The switch should be between the two access points.
D) The SSID name is incorrect.
6) Which of the following is a common OSI Layer 1 (physical layer) troubleshooting issue?
(Choose two.)
A) Bad cables or connectors
B) dB loss
C) Bad module
D) Port configuration
E) VLAN configuration
7) Which of the following is a common OSI Layer 3 (network layer) troubleshooting issue?
(Choose two.)
A) Mismatched maximum transmission unit (MTU) for IP packets
B) Distance limitations exceeded
C) Incorrect subnet mask
D) Crosstalk
E) Layer 2 loop
8) Which of the following is a common wireless network troubleshooting issue? (Choose two.)
A) Radio-frequency interference (RFI)
B) Crosstalk
C) Multiple paths of propagation
D) Layer 2 loop
E) Bad cables or connectors
9) The administrative distance of a routing protocol can be thought of as the believability of that
routing protocol.
10) What is the administrative distance of Routing Information Protocol (RIP) routing protocol?
A) 115
B) 120
C) 110
D) 90
11) What is the administrative distance of Open Shortest Path First (OSPF) routing protocol?
A) 115
B) 120
C) 110
D) 90
12) A(n) ________ is a broken strand of copper that prevents current from flowing through a
circuit. (Select the best answer.)
A) open
B) short
C) tap
D) break
13) What is the name of the technology that is typically implemented on switches to avoid
Ethernet connectivity problems when the wrong type of cable (straight or crossover) is used to
connect devices?
A) ADIX
B) MDIX
C) APAC
D) LPAC
14) What is the primary protocol that is used to mitigate Layer 2 loops?
A) CDP
B) LACP
C) STP
D) Ethernet
15) What is the only routing protocol that does not have a separate Layer 3 data structure?
A) EIGRP
B) IS-IS
C) OSPF
D) RIP
16) What is the name of the relationship between two OSPF devices that are connected together
and exchange link-state information?
A) Adjacency
B) Peering
C) Autonomous systems
D) Attachments
17) Which parameter determines which IP addresses are in the same subnetwork?
A) IP class
B) Subnet mask
C) Default gateway
D) Subnet identifier
8
18) A device that has enabled the DF bit in the IP header is unable to send traffic to a specific
destination that it was able to reach before. What is the likely problem?
A) Incorrect destination IP address
B) Incorrect subnet mask
C) MTU mismatch
D) Incorrect subnet identifier
19) What is the name of the indicator that measures the power of a received wireless signal?
A) WSLM
B) LRV
C) SNR
D) RSSI
20) ________ can cause data to arrive at uneven intervals on wireless networks.
A) Multiple propagation modes
B) Multiple dispersion patterns
C) Multiple channel use
D) Multiple signal strengths
21) When you are troubleshooting a network problem, what is one of the first steps you should
take in the process?
A) Establish a theory of probable cause.
B) Determine if anything has changed.
9
C) Gather information.
D) Approach multiple problems.
22) We typically troubleshoot networking issues using one of the two networking models: OSI or
TCP/IP. A potential Layer 1 problem can be broken strands of copper in a cable, either
preventing a flow through a circuit or touching each other and thus resulting in lower resistance.
What type of Layer 1 problem is this?
A) Opens and shorts
B) Splitting pairs in a cable
C) dB loss
D) Cable placement
23) To protect switches from misconfiguration, we use Spanning Tree Protocol (STP). However,
if STP fails, what issue can occur in a network?
A) Speed mismatch
10
B) Layer 2 loop
C) Bad module
D) Duplex mismatch
24) Which Layer 1 troubleshooting issue can occur from not carefully ensuring compatibility
with cable type and wavelength in use?
A) Transceiver mismatch
B) Crosstalk
C) dB loss
D) Opens and shorts
25) What common wireless troubleshooting issue can cause lower data rates and higher retries as
a result of a signal changing direction when traveling from sender to receiver?
A) Incorrect default gateway
B) Rogue DHCP server
C) Misconfiguration of wireless parameters
D) Refraction
11
Copyright © 2018 Pearson Education, Inc.
Answer: D
Explanation: Refraction is the bending of a wave when it enters a medium where the speed is
different, as covered in Chapter 3, “Network Components.” It is important to track possible
refraction when designing your wireless network because if a signal changes direction in
traveling from sender to receiver, it can cause lower data rates and high retries. This can lead to
an overall lessening of capacity.
Chapter: Chapter 14: Network Troubleshooting
Remediation: Wireless Troubleshooting
26) Absorption occurs in wireless transmissions when a material is absorbing the signal,
converting the signal’s energy into heat. What very common materials have a high absorption
rate?
A) Wood
B) Concrete
C) Plasterboard/drywall
D) Window
27) Misconfiguration of wireless parameters is one of several common problems in wireless
networks. For example, if a wireless client was only capable of WPA encryption, which AP
would the client be able to connect to?
A) 802.11a
B) WEP
C) WPA2
D) WPA